JP3592910B2 - Accelerator tube - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an acceleration tube applied to a high-frequency particle accelerator, and more particularly, to an acceleration tube using a choke mode cavity.
[0002]
[Prior art]
Generally, when electrons are accelerated using a linear accelerator, a disc-loaded traveling-wave accelerator tube as shown in FIG. 19 is used.
[0003]
The disc-loaded traveling-wave accelerating tube 51 has a disk 54 having a beam bore 53 formed at a central portion thereof disposed at a predetermined interval inside a cylindrical waveguide in order to pass a group 52 of electrons to be accelerated and to transmit high-frequency power. Have been. Each section divided by the disk 54 is called a cell. A coupler cell 56 for coupling to an external waveguide 55 is attached to both ends of the acceleration tube 51. Cells other than the coupler cell 56 are called regular cells 57. Reference numeral 58 denotes a dummy load for absorbing the group of electrons 52 emitted from the coupler cell 56.
[0004]
Normally, to accelerate electrons, the fundamental mode TM of a cylindrical waveguide having an electric field component parallel to the central axis is used. ₀₁ Mode is used. TM for cylindrical waveguide ₀₁ The speed at which the electromagnetic field distribution of the mode advances along the central axis, that is, the phase speed is faster than the speed of light. According to relativity, the speed of matter is less than the speed of light, so TM ₀₁ The electromagnetic field distribution of the mode overtakes the group of electrons 52, and the electrons are merely accelerated and decelerated alternately and are not accelerated. In order to accelerate the electrons efficiently, the phase velocity of the electromagnetic wave propagating inside the accelerating tube 51 is made to coincide with the velocity of the electrons, and the electrons are moved to a position (phase) where the strongest accelerating force in the traveling electromagnetic field distribution is received. It is important to create a so-called crowding state that collects the birds. The group of electrons 52 in the grouped state is called a bunch.
[0005]
Therefore, by inserting the disk 54 into the cylindrical waveguide to reduce the phase velocity of the electromagnetic wave, and by adjusting the inner diameter of the acceleration tube 51, the diameter of the beam bore 53, the interval between the disks 54, and the like, the phase velocity of the electromagnetic wave can be reduced. To match the speed with high accuracy. Since the electromagnetic field distribution is spatially a periodic distribution with one cycle of the guide wavelength of the electromagnetic wave, the bunch 52 also normally enters the accelerator tube 51 at intervals equal to the guide wavelength.
[0006]
Normally, high-frequency power transmitted from a high-frequency power supply (not shown) via an external waveguide 55 is input into the acceleration tube 51 from a coupler cell 56 on the electron incident side (left side in the drawing), and the same as the bunch 52. The electrons are accelerated while propagating in the direction, and are output to the outside of the acceleration tube 51 through the exit-side coupler cell 56 of the bunch 52. At this time, the high frequency power output from the electron emission side coupler cell 56 is absorbed by the dummy load 58 so as not to return to the acceleration tube 51 side by reflection.
[0007]
Inside the accelerating tube 51, a current is induced on the inner surface of the tube by the propagating high-frequency electromagnetic field, and a power loss is generated according to the electric resistance of the inner surface of the tube. A disk 54 of a high-grade metal, generally, an electron-tube-grade oxygen-free copper is used. In addition, the scattering of gas molecules inside the acceleration tube 51 may cause electrons to deviate from the central axis and collide with the disk 54 outside the beam bore 53 and disappear, so that a vacuum pump (not shown) is connected and the inside of the acceleration tube 51 is connected. , A high vacuum state is maintained.
[0008]
The bunch 52 interacts with a high-frequency electromagnetic field propagating in the accelerating tube 51 to receive an accelerating force, and also interacts with the structure of the accelerating tube 51 to generate a high-frequency wave used for acceleration called a wake field. Induces electromagnetic fields of different frequencies. As described above, since the acceleration tube 51 is made of the metal disk 54 having high electric conductivity, the power loss of the wake field is small, and it takes time for the wake field to attenuate. In a certain cell, if a subsequent bunch 52 passes before the wake field induced by the preceding bunch 52 sufficiently attenuates, the electrons are deflected by the Lorentz force received from the wake field remaining in the cell, or an extra load is applied. The deceleration causes so-called beam instability. The electrons deflected or accelerated or decelerated by the wake field deviate from the central axis, and the size of the bunch 52 increases. Eventually, the outer electrons come off the beam bore 53 and collide with the disk 54, so that further acceleration becomes impossible.
[0009]
Therefore, as an alternative to the disc-loaded traveling wave accelerator 51, a choke mode cavity accelerator capable of suppressing the instability of electrons caused by the wake field is used.
[0010]
FIG. 20 is a conceptual sectional view of a regular cell portion of the choke mode cavity acceleration tube. The regular cell 60 of the choke mode cavity accelerator includes an acceleration cavity 61, a coupling slot 62, a radial line waveguide 63, and a choke 64. The acceleration cavity 61 has basically the same structure as the regular cell 57 of the disc-loaded traveling wave accelerator. The coupling slot 62 is opened over the circumference of the acceleration cavity 61 over one circumference. The acceleration cavity 61 is electromagnetically coupled to the radial line waveguide 63 via the coupling slot 62.
[0011]
The wake field generated by the interaction between the bunch 52 and the acceleration tube cavity 61 is drawn out of the acceleration cavity 61 by the radial line waveguide 63 and attenuated inside the acceleration cavity 61. If the time required for this attenuation is sufficiently fast, the wake field will not adversely affect the bunch 52 that is subsequently incident to the bunch 52 that caused it.
[0012]
However, if the radial line waveguide 63 is simply coupled to the acceleration cavity 61, an electromagnetic field (hereinafter, referred to as an acceleration mode) input to the acceleration tube for accelerating the electrons is also drawn out. For this purpose, a choke 64 is provided at the joint between the acceleration cavity 61 and the radial line waveguide 63, and reflects only the acceleration mode. The choke 64 is a cylindrical groove having a length of λ / 4 perpendicular to the radial line waveguide 63 at a position separated by 結合 of the guide mode wavelength (hereinafter referred to as λ) of the acceleration mode when viewed from the coupling slot 62. 65 are provided. This cylindrical groove 65 forms a λ / 4-length coaxial line of a terminal short-circuit. Therefore, the connection point between the radial line waveguide 63 and the cylindrical groove 65 becomes the maximum voltage point, and the current flowing there becomes zero. That is, the current 66 crossing the opening formed by the radial line waveguide 63 outside the groove 65 is zero, and the acceleration mode is the outside of the cylindrical groove 65, that is, the radial line waveguide 63 outside the choke 64. Are not electromagnetically coupled with each other, so that the high-frequency power in the acceleration mode does not leak outward from the choke 64. On the other hand, since the coupling slot 62 is located at a position of λ / 2 from the short-circuit end, it becomes a zero point of the voltage, and operates in the acceleration mode in the same manner as the presence of the conductor wall even though the gap exists.
[0013]
FIG. 21 is a conceptual diagram of a cross section taken along a central axis of an acceleration tube 70 (hereinafter, referred to as a choke mode cavity acceleration tube) using a choke mode cavity manufactured by the High Energy Physics Laboratory. FIG. 22 is a sectional view taken along line GG of FIG.
[0014]
In the choke mode cavity accelerating tube 70, an oxygen-free copper disc 71 obtained by cutting the accelerating cavity 61 and the choke 64 is joined to each other via a spacer 72, and a coupler cell 56 is joined to both ends thereof. The gap formed by sandwiching the spacer 72 between the adjacent oxygen-free copper disks 71, 71 becomes the radial line waveguide 63. The spacer 72 is hollow and also serves as a cooling water passage. The wake field drawn by the radial line waveguide 63 is radiated to the outside of the acceleration tube 70 from an opening 73 at an end of the radial line waveguide 63. As described above, the choke mode cavity acceleration tube 70 does not have a hermetic structure unlike the disk loaded type acceleration tube 51, so that the inside cannot be brought into a high vacuum state. Therefore, the whole is used in a state where it is put in a vacuum chamber 74 and kept at a high vacuum.
[0015]
[Problems to be solved by the invention]
By the way, in the choke mode cavity acceleration tube 70 shown in FIG. 21, since the end of the radial line waveguide 63 is directly opened in the vacuum chamber 74, impedance mismatch occurs, and reflection occurs here. A part of the wake field extracted from the acceleration cavity 61 by the radial line waveguide 63 is reflected at the end of the radial line waveguide 63, propagates back to the waveguide 63, and re-enters the acceleration cavity 61. Incident. As a result, the attenuation of the wake field inside the acceleration cavity 61 is effectively reduced, and a problem arises in that the instability of the beam cannot be sufficiently suppressed. In particular, when the acceleration current is large, that is, when the amount of charge per bunch is large, the intensity of the induced wake field also increases, and this problem becomes serious.
[0016]
If the vacuum chamber 74 is too close to the end of the radial line waveguide 63, the wake field radiated from the opening at the end of the radial line waveguide 63 is sufficiently reflected by the vacuum chamber 74 to re-enter. And the relatively large reflected wave returns from the vacuum chamber 74 to the radial line waveguide 63, causing the same problem as described above. Therefore, there is a problem that the vacuum chamber 74 cannot be downsized.
[0017]
Further, in order to suppress the beam instability, it is necessary to suppress the occurrence of a wake field. For this purpose, it is necessary to accurately pass the acceleration beam through the center of the acceleration cavity 61. In a conventional choke mode cavity acceleration tube, after processing and assembling the acceleration tube with high accuracy, the position is accurately adjusted at the time of installation. This is achieved by performing
[0018]
In the conventional choke mode cavity acceleration tube 70, since the acceleration cavity 61 and the choke 64 are joined so that the spacer 72 is sandwiched between the oxygen-free copper disks 71 formed by cutting, the cylinder waveguide is basically a cylindrical waveguide. Stiffness is smaller than that of the disk loaded acceleration tube 51. As a result, when the acceleration tube becomes long, the required installation accuracy cannot be obtained, and it is necessary to insert a mechanism for correcting deflection and finely adjusting the position of the acceleration tube in the middle of the acceleration tube. Is inside the vacuum chamber 74, the structure becomes complicated, and there is a problem that sufficient accuracy cannot be obtained.
[0019]
Similarly, in order to use the entire accelerating tube in the vacuum chamber 74 for use, a high frequency wave used for acceleration is introduced into the waveguide 55 and the cooling water channel for introducing the accelerating tube 70 without breaking the vacuum. It has to be introduced into the vacuum chamber 74, so that there is a problem that the structure becomes complicated and reliability is reduced.
[0020]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an acceleration tube capable of sufficiently suppressing beam instability caused by a wake field even during high current acceleration.
[0021]
Another object of the present invention is to provide a highly reliable acceleration tube whose structure is simplified.
[0022]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a through hole through which a particle to be accelerated passes at the center, and an acceleration cavity for accelerating the energy of the particle to be accelerated by high-frequency power on one side, and leakage of the high-frequency power. In an accelerating tube in which metal plates cut with chokes are arranged at predetermined intervals, all the metal plates are integrated by being provided so as to be located outside the choke between adjacent metal plates, and the acceleration cavity is removed from the acceleration cavity. An electromagnetic wave absorber that absorbs high-frequency power other than the extracted acceleration mode, a cooling pipe penetrated and joined to the metal plate so as to be located outside the choke, and all integrated metal plates. A vacuum jacket for vacuum sealing is provided so as to surround it, and a through-hole for passing accelerated particles is provided at the center. Is joined at both ends of the socket, an accelerating tube is provided a coupler cell for coupling to an external high-frequency transmission system.
[0023]
According to the invention in which such a measure is taken, the electromagnetic wave absorber is disposed outside the acceleration cavity and the choke, so that the electromagnetic wave absorber does not affect the high-frequency power and absorbs the wake field drawn out. It can be sufficiently attenuated before reaching the vacuum jacket. Further, the influence of the wake field reflected at the end of the radial line waveguide and re-entering the acceleration cavity can be eliminated, and beam stability can be ensured even during high current acceleration.
[0024]
Further, by providing coupler cells on both outer sides of the vacuum jacket, the position of the accelerator can be easily adjusted via the coupler cells, and the adjustment accuracy can be improved.
[0025]
In another invention, a vacuum jacket can be eliminated by connecting a ring electromagnetic wave absorber between adjacent metal plates so as to include an acceleration cavity and a choke, and a metal jacket is provided outside the ring electromagnetic wave absorber. If the cooling pipe is installed so as to penetrate the plate, the cooling pipe is installed in the atmosphere, and there is no fear of accidental leakage of the cooling water into the vacuum, and further reliability can be ensured. Further, since the cooling pipe is installed in the atmosphere, it is convenient for intermediate support and position adjustment of the accelerating pipe, and contributes to improvement of adjustment accuracy. Further, if the electromagnetic wave absorber is disposed outside the acceleration cavity and the choke, the electromagnetic wave absorber does not affect the high-frequency power and can absorb the wake field drawn out and sufficiently attenuate before reaching the vacuum jacket. Further, the influence of the wake field reflected at the end of the radial line waveguide and re-entering the acceleration cavity can be eliminated, and beam stability can be ensured even during high current acceleration.
[0026]
Further, in another invention, electromagnetic wave absorbers are provided on both surfaces of every other metal plate so as to be located outside the acceleration cavity and the choke to absorb high frequency power other than the acceleration mode drawn out from the acceleration cavity. As described above, it can be attenuated by absorption of the wake field as described above, eliminating the effect of the wake field reflected at the end of the radial line waveguide and re-entering the acceleration cavity, and ensuring beam stability even at high current acceleration . In addition, by inserting a metal cylinder between adjacent metal plates and integrating all metal plates so as to include the acceleration cavity, choke and electromagnetic wave absorber, a vacuum jacket can be eliminated, and cooling water can be eliminated. This eliminates the risk of accidental leakage into the vacuum, and further ensures reliability. Further, if the electromagnetic wave absorbers are provided on both sides of the metal plate, the stress can be reduced, and the deformation of the accelerating cavity and the choke can be suppressed, so that the positional accuracy and the required functions can be reliably achieved.
[0027]
According to another aspect of the present invention, a through hole is provided at the center for passing the particles to be accelerated, and an acceleration cavity for accelerating the energy of the particles to be accelerated by high-frequency power on both sides and a choke for preventing leakage of the high-frequency power A metal plate in which a first metal plate obtained by cutting a metal plate and a second metal plate provided with a through-hole at the center for passing particles to be accelerated and not cutting the acceleration cavity and the choke are alternately arranged at a predetermined interval. We take arrangement means. If electromagnetic wave absorbers that absorb high-frequency power other than those in the acceleration mode drawn out of the acceleration cavity are provided on both sides of the second metal plate that does not cut chalk or the like, as described above, absorption attenuation of the wake field is effectively reduced. In addition, the influence of the wake field reflected at the end of the radial line waveguide and re-entering the acceleration cavity can be eliminated, and beam stability can be ensured even during high current acceleration. In addition, since the electromagnetic wave absorber is provided on the second metal plate which is not cut, the deformation of the acceleration cavity and the choke of the first metal plate can be eliminated, so that the assembling accuracy of the accelerating tube is improved and the wake field is induced. Can be reliably suppressed.
[0028]
Further, in another invention, the metal cylinder has an inner diameter including the accelerating cavity and the choke, and a metal cylinder is interposed between adjacent metal plates to integrate all the metal plates. By providing the electromagnetic wave absorber on the inner surface, in addition to having the various functions described above from the arrangement configuration of the electromagnetic wave absorber, since the electromagnetic wave absorber is not provided on the surface of the metal plate, the deformation of the acceleration cavity and the choke can be eliminated. In addition, the accuracy of assembling the acceleration tube can be improved.
[0029]
Further, in another invention, a metal cylinder having an inner diameter including an acceleration cavity and a choke, having a flange on an inner surface, and being interposed between adjacent metal plates to integrate all the metal plates. And an electromagnetic wave absorber provided on both sides of the flange of the metal cylinder and absorbing high frequency power other than the acceleration mode drawn out of the acceleration cavity, and cooling water disposed outside the metal cylinder and the metal plate. A cooling pipe or a jacket for flowing is provided.
[0030]
According to the invention in which such measures are taken, the electromagnetic wave absorber is not provided on the metal plate, so that the deformation of the acceleration cavity and the like can be eliminated, and the assembling accuracy of the acceleration tube is improved and the induction of the wake field is reliably suppressed. it can.
[0031]
Further, in another invention, the metal member having the electromagnetic wave absorber disposed on both surfaces is formed of two members divided by a chalk portion, and the two members are joined after attaching the electromagnetic wave absorber to the metal member. Then, even if the metal body and the electromagnetic wave absorber have different physical property values, for example, a member having an acceleration cavity that is easily deformed due to a rise in temperature at the time of joining is joined to another member after joining the electromagnetic wave absorber. The deformation of the cavity can be eliminated, and the assembling accuracy of the accelerating tube can be improved and the induction of the wake field can be reliably suppressed.
[0032]
Further, another invention has an inner diameter including an accelerating cavity and a choke of a metal plate, is joined between adjacent metal plates to integrate all the metal plates, and other than the acceleration mode drawn out from the acceleration cavity. By providing a ring-shaped electromagnetic wave absorber that absorbs high-frequency power and a cooling water passage formed by cutting the metal plate inside to a predetermined depth and joining a lid to an opening thereof, the ring-shaped electromagnetic wave absorber is provided. In addition to the effect of the arrangement of the body, there is no need to join the cooling water passages, the deformation of the acceleration cavity due to the joining is small, and the assembling accuracy of the acceleration tube is improved.
[0033]
Further, another invention is directed to a metal cylinder having an inner diameter including an acceleration cavity and a choke, and joining between the adjacent metal plates to integrate all the metal plates, and an inner side of the metal cylinder. The accelerating cavity and the choke are arranged on either side of the metal cylinder, on either side of the brim projecting from the inner surface of the metal cylinder, or on both sides of every other metal plate. By providing an electromagnetic wave absorber that absorbs high-frequency power other than the acceleration mode extracted from the above, and a cooling water passage formed through the metal plate and the metal cylinder, the arrangement of the electromagnetic wave absorber described above is provided. In addition to the effects, the cooling pipe 7 and the cooling water jacket 23 are not required, so that the cost can be reduced and the assembling operation can be simplified.
[0034]
Further, another invention provides an electromagnetic wave absorber provided outside the acceleration cavity and the choke on any one of the surfaces of each metal plate. In addition, cooling is performed so as to penetrate the metal cylinder and the metal cylinder which has an inner diameter including the acceleration cavity and the choke and is inserted between the adjacent metal plates to integrate all the metal plates and the metal cylinder. If the water channel is formed, the cooling pipe 7 and the cooling water jacket 23 become unnecessary, so that the cost can be reduced and the assembling operation can be simplified.
[0035]
Further, another invention provides an electromagnetic wave absorber on any surface of each of the metal plates so as to be located outside the acceleration cavity and the choke, and has an inner diameter including the acceleration cavity and the choke. By providing a metal cylinder interposed between adjacent metal plates to integrate all metal plates, and further providing a cooling pipe or jacket for flowing cooling water outside the metal plate and the metal cylinder, Similarly, in addition to the above-mentioned effects derived from the arrangement of the electromagnetic wave absorber, the configuration can be simplified, the problem of leakage of cooling water into vacuum can be solved, and the reliability can be further improved.
[0036]
Further, another invention is to reduce the above-mentioned metal cylinder by integrating all metal plates by inserting a metal ring having a diameter including the acceleration cavity and the choke. In addition, it is possible to reduce processing and man-hours, and by providing an electromagnetic wave absorber on a metal ring separate from the metal plate, deformation of the acceleration cavity is reduced, improving the accuracy of assembling the acceleration tube and improving the wake Can be suppressed.
[0037]
Further, another invention can reduce the above-mentioned metal cylinder by integrating all the metal plates by inserting a metal ring having a diameter including the acceleration cavity and the choke. In addition, machining and man-hours can be reduced, and by providing an electromagnetic wave absorber on a metal ring separate from the metal plate, deformation of the acceleration cavity is reduced, improving the accuracy of assembling the accelerator tube and improving the wake field. Induction can be suppressed. Furthermore, if a plurality of slots are provided in the outer circumferential direction of the electromagnetic wave absorber of the metal ring, the wake field propagates from one electromagnetic wave absorber through the slot to the other electromagnetic wave absorber, so that the propagation distance is reduced. It can be expected that the wake field will be further attenuated.
[0038]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the acceleration tube according to the present invention will be described with reference to the drawings.
[0039]
(First Embodiment)
FIGS. 1 to 3 are configuration diagrams showing an embodiment of an acceleration tube according to the present invention. FIG. 1 is a sectional view taken along a central axis of a regular cell portion of a choke mode cavity accelerator, and FIG. 2 is a sectional view perpendicular to the central axis. 1 is a cross-sectional view taken along the line BB shown in FIG. 2, and FIG. 2 is a cross-sectional view taken along the line AA shown in FIG. FIG. 3 is a sectional view taken along the central axis of the coupler cell portion of the choke mode cavity acceleration tube. 1 and 3 show only a cross-sectional portion of the coupler cell portion from the viewpoint of facilitating understanding, and a non-cross-sectional portion is omitted. Hereinafter, the same applies to each drawing.
[0040]
In this embodiment, an oxygen-free copper disk having a beam bore through which particles to be accelerated pass, and having an acceleration cavity and a choke cut on one surface are arranged at predetermined intervals, and sandwiched between adjacent oxygen-free copper disks. An electromagnetic wave absorber to be joined, integrated and integrated is arranged outside the choke to absorb the wake field drawn out and sufficiently attenuate before reaching the vacuum jacket, and to provide a coupler cell outside the vacuum jacket , To achieve simplification of the structure.
[0041]
First, as shown in FIGS. 1 and 2, the regular cell portion of the choke mode cavity acceleration tube has a beam bore 1 at the center for allowing particles to be accelerated to pass therethrough, and accelerates in a circumferential direction outside the beam bore 1. Oxygen-free copper disks 4 formed by cutting the cavity 2 and the choke 3 are arranged at predetermined intervals so that the centers of the beam bores 1 are aligned, and the choke 3 is interposed between the oxygen-free copper disks 4. A coin-shaped SiC (silicon carbide: semiconductive ceramic) 5 as an electromagnetic wave absorber is interposed so as to be sandwiched at an outer position and joined to each other by brazing.
[0042]
The thickness of the coin-shaped SiC 5 has a function as a spacer for determining the interval between the adjacent oxygen-free copper disks 4 and is precisely processed with high precision. The gap obtained by inserting the coin-shaped SiC 5 between the adjacent oxygen-free copper disks 4 is a radial line waveguide 6 for extracting a wake field from the acceleration cavity 2. Further, cooling pipes 7 are provided so as to penetrate and join the oxygen-free copper disc 4 so as to pass outside the choke 3. The oxygen-free copper disks 4, 4 integrated with the coin-shaped SiC 5 interposed therebetween are housed in a vacuum jacket 8 and maintained in a high vacuum state. 9 is an opening.
[0043]
On the other hand, the coupler cell portion shown in FIG. 3 has a step portion 10 formed at the end of the vacuum jacket 8 and a coupler cell 11 having substantially the same diameter as the oxygen-free copper disk 4 is provided. The coupler cell 11 has a through-hole formed at the center thereof for allowing particles to be accelerated to pass therethrough, and has a space inside having a function corresponding to the acceleration cavity 2. And is connected to a waveguide 12 for external high-frequency transmission. 13 is a cooling pipe outlet.
[0044]
Therefore, according to the configuration of the above embodiment, the coin-shaped SiC 5 as the electromagnetic wave absorber is located outside the acceleration cavity 2 and the choke 3 and inside the opening 9 inside the vacuum jacket 8. Since it is provided, the coin-shaped SiC 5 does not affect the high frequency used for acceleration reflected by the choke 3, but absorbs the wake field drawn out and is sufficient before reaching the opening 9 to the vacuum jacket 8. Can be attenuated. Therefore, the reflection of the wake field at the end of the radial line waveguide 6 is negligible. Further, the wake field reflected at the end of the radial line waveguide 6 and returning toward the acceleration cavity 2 passes through a certain area of the coin-shaped SiC 5 again, and is further attenuated.
[0045]
Further, as described above, the wake field is sufficiently attenuated through the radial line waveguide 6 to reach the opening 9 to the vacuum jacket 8, and from this opening 9 to the inside of the vacuum jacket 8. The intensity of the emitted wakefield is very weak.
[0046]
In the above-described choke mode cavity accelerator, the attenuation of the wake field inside the acceleration cavity 2 due to the re-incident of the wake field from the end of the radial line waveguide 6 into the acceleration cavity 2 is effectively reduced. Can be prevented, and sufficient beam stability can be ensured even during high current acceleration.
[0047]
Further, according to this embodiment, since the intensity of the wake field radiated from the opening 9 into the vacuum jacket 8 is very weak, the wake field is re-incident on the radial line waveguide 6 due to reflection from the vacuum jacket 8. There is no need to consider the effects. Therefore, the vacuum jacket 8 can be brought closer to the opening 9 of the radial line waveguide 6. Thereby, for example, the coupler cell 11 can be provided outside the vacuum jacket 8, and the waveguide 12 and the cooling pipe outlet 13 connected to the coupler cell 11 can be provided directly outside the vacuum jacket 8. The structure is simple and the reliability can be improved.
[0048]
Further, since the coupler cell 11 is provided outside the vacuum jacket 8, a mechanism for supporting and adjusting the position of the accelerating tube by the coupler cells 11 on both sides can be placed in the atmosphere. It can be simplified and the adjustment accuracy is improved. In addition, since the oxygen-free copper discs 4 are connected and integrated via the coin-shaped SiC 5 having high rigidity, the rigidity of the entire acceleration tube can be increased.
[0049]
The shape of the SiC 5 is not limited to a coin shape, but may be various shapes such as a rectangular parallelepiped and a fan shape, and the position of the cooling pipe 7 may be on the outer peripheral side of the SiC 5.
[0050]
(Second embodiment)
4 and 5 show another embodiment of the acceleration tube according to the present invention.
[0051]
FIG. 4 is a cross-sectional view along a central axis of a regular cell portion of the choke mode cavity accelerator, and FIG. 5 is a cross-sectional view perpendicular to the central axis. 4 is a cross-sectional view taken along the line DD shown in FIG. 5, and FIG. 5 is a cross-sectional view taken along the line CC shown in FIG. 4 and 5, the same or similar members as those in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0052]
In this embodiment, a ring-shaped SiC is joined and arranged as an electromagnetic wave absorber disposed between oxygen-free copper disks, so that there is no vacuum jacket.
[0053]
That is, in the regular cell portion of the accelerating tube, an electromagnetic wave absorber is interposed between the oxygen-free copper disks 4, and the acceleration cavity 2 and the choke cut on one surface of the oxygen-free copper disk 4 are used as the electromagnetic wave absorber. A ring-shaped SiC 21 having a sufficient inner diameter to contain 3 inside is used. The oxygen-free copper disks 4 are arranged at predetermined intervals so that the centers of the beam bores 1 are aligned. The ring-shaped SiC 21 is joined between the adjacent oxygen-free copper disks 4 so as to include the acceleration cavities 2 and the chokes 3 of the oxygen-free copper disks 4, thereby forming a ring with the oxygen-free copper disks 4. And an integrated configuration with SiC21.
[0054]
Further, a cooling pipe 7 is provided so as to penetrate and join each oxygen-free copper disk 4 so as to be located outside the ring-shaped SiC 21.
[0055]
According to the configuration of such an embodiment, the ring-shaped SiC 21 can be used as the vacuum boundary, and the vacuum jacket can be eliminated. Further, the cooling pipe 7 itself can be arranged in the atmosphere, so that there is no fear of leakage of the cooling water into the vacuum, and the reliability can be further improved.
[0056]
In addition, the mechanism that supports and adjusts the position of the accelerating tube can be installed in the atmosphere not only at both ends of the accelerating tube but also in the case where adjustment is required on the way, so that further improvement in adjustment accuracy can be expected. .
[0057]
Further, with respect to the effect of securing the stability of the beam at the time of large current acceleration and the improvement of the rigidity, it can be expected that the function and arrangement of the ring-shaped SiC 21 have the same or higher effects as those of the first embodiment.
[0058]
(Third embodiment)
FIG. 6 shows another embodiment of the accelerating tube according to the present invention, and is a cross-sectional view along a central axis of a regular cell portion of the choke mode cavity accelerating tube. In the figure, the same reference numerals are given to the same or similar members as those in the respective drawings, and the detailed description thereof will be omitted.
[0059]
In this embodiment, for example, in addition to a ring-shaped SiC 21, a metal cylinder 22 is arranged outside the ring-shaped SiC 21 so as to be sandwiched and joined by an oxygen-free copper disk 4.
[0060]
Specifically, the regular cell portion of the choke mode cavity acceleration tube has a beam bore 1 at the center for allowing particles to be accelerated to pass through, and cuts the acceleration cavity 2 and the choke 3 outward from the beam bore 1. Oxygen-free copper disks 4 are arranged such that the centers of the beam bores 1 are aligned on a straight line at predetermined intervals. Further, for example, the acceleration cavities 2 and the chokes 3 are provided on both sides of every other oxygen-free copper disks 4. For example, a ring-shaped SiC 21 is bonded so as to be included inside.
[0061]
Further, the metal cylinder 22 is arranged so as to include the acceleration cavity 2, the choke 3, and the ring-shaped SiC 21 as an electromagnetic wave absorber inside. These metal cylinders 22 are integrated by being sandwiched and joined between oxygen-free copper disks 4.
[0062]
Further, a cooling water jacket 23 for flowing cooling water outside the metal cylinder 22 is provided.
[0063]
According to the configuration of such an embodiment, since the ring-shaped SiC 21 as the electromagnetic wave absorber is provided outside as viewed from the acceleration cavity 2, the high frequency used for acceleration reflected by the choke 3 is not affected. However, it absorbs the wakefield drawn out and sufficiently attenuates before reaching the metal cylinder 22. Therefore, the reflection of the wake field at the end of the radial line waveguide 6, that is, the inner wall of the metal cylinder 22, is very small. Further, the wake field reflected at the end of the radial line waveguide 6 and returned toward the acceleration cavity 2 passes through a certain region of the SiC 21 again, and is further attenuated.
[0064]
Thus, the problem that the attenuation of the wake field inside the acceleration cavity 2 due to the re-incident of the wake field, which is a reflected wave from the end of the radial line waveguide 6, to the acceleration cavity 2 can be prevented can be prevented. In addition, beam stability can be sufficiently ensured even at the time of large current acceleration.
[0065]
In addition, according to this configuration, by setting the metal cylinder 22 as a vacuum boundary, not only the vacuum jacket can be made unnecessary, but also the cooling water jacket 23 is set in the atmosphere, so that the cooling water leaks into the vacuum. And the reliability can be further improved.
[0066]
Also, since the oxygen-free copper disk 4 and the metallic cylinder 22 are joined and integrated, the rigidity can be increased, and the mechanism for supporting and adjusting the position of the accelerating tube is only provided at both ends of the accelerating tube. However, even when adjustment is required in the middle of the process, the device can be installed in the atmosphere, and further improvement in adjustment accuracy can be expected.
[0067]
Further, when the ring-shaped SiC 21 is joined to the oxygen-free copper disk 4 by brazing or the like, the oxygen-free copper disk 4 is deformed due to a difference in linear expansion coefficient between the two materials. In the present embodiment, since the ring-shaped SiC 21 is joined to both sides of the oxygen-free copper disk 4, stress is relieved, deformation of the acceleration cavity 2 and the choke 3 can be suppressed, and joining reliability is improved.
[0068]
The SiC 21 is not limited to the ring shape, but may be of various shapes such as a coin shape, a rectangular parallelepiped, and a fan shape.
[0069]
(Fourth embodiment)
FIG. 7 shows another embodiment of the accelerating tube according to the present invention, and is a cross-sectional view along a central axis of a regular cell portion of the choke mode cavity accelerating tube. 6, the same or similar members as those in FIG. 6 are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0070]
In this embodiment, two differently shaped oxygen-free copper disks are alternately arranged to improve the assembly accuracy of the ring-shaped SiC 21, suppress deformation of the acceleration cavity 2 and the like, and suppress induction of a wake field. .
[0071]
That is, the regular cell portion of this accelerating tube has a beam bore 1 for passing particles to be accelerated at the center, and an oxygen-free copper disk 24 having an accelerating cavity 2 and a choke 3 cut on both sides, and a center at the center. An oxygen-free copper disk 25 having a beam bore 1 for passing particles to be accelerated and not cutting the acceleration cavity 2 and the choke 3 is alternately arranged at predetermined intervals on a straight line with the center of the beam bore 1 aligned. Arrange them side by side. Then, for example, a ring-shaped SiC 21 having an inner diameter sufficient to include the acceleration cavity 2 and the choke 3 therein is joined to both surfaces of the oxygen-free copper disk 25, and further, the acceleration cavity 2, the choke 3, and a ring serving as an electromagnetic wave absorber Metal cylinder 22 is arranged so as to include SiC 21 inside. The metal cylinder 22 has an integrated structure by being joined so as to be sandwiched between adjacent oxygen-free copper disks 24 and 25.
[0072]
Further, a cooling pipe or a cooling water jacket 23 for flowing cooling water is provided outside the metal cylinder 22.
[0073]
According to the configuration of this embodiment, the same functions and effects as those of the third embodiment can be obtained. Further, by joining the ring-shaped SiC 21 to the simple oxygen-free copper disk 25, deformation after the joining is reduced, the assembling accuracy of the accelerating tube is increased, and the induction of the wake field can be expected to be suppressed.
[0074]
The shape of SiC is not limited to a ring shape, but may be various shapes such as a coin shape, a rectangular parallelepiped, and a fan shape.
[0075]
(Fifth embodiment)
FIG. 8 shows another embodiment of the acceleration tube according to the present invention, and is a cross-sectional view taken along a central axis of a regular cell portion of the choke mode cavity acceleration tube. 6, the same or similar members as in FIGS. 6 and 7 are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0076]
In this embodiment, a ring-shaped SiC is bonded to a metal cylinder 22 instead of an oxygen-free copper disk, thereby improving the assembly accuracy of the ring-shaped SiC 21 and reducing the deformation of the acceleration cavity 2 and the like, and inducing a wake field. The goal is to control it.
[0077]
That is, the regular cell part of the accelerating tube has a beam bore 1 at the center for allowing particles to be accelerated to pass therethrough, and an oxygen-free copper disc formed by cutting the accelerating cavity 2 and the choke 3 outward of the beam bore 1. 4 are arranged at predetermined intervals so that the center of each beam bore 1 is aligned on a straight line. Then, both surfaces of the metal cylinder 22 are joined so as to be sandwiched in the vicinity of the periphery of the adjacent oxygen-free copper disk 4 and to include the acceleration cavity 2 and the choke 3 inside. A ring-shaped SiC 21 is bonded to the inner surfaces of these metal cylinders 22 so as to be located outside the acceleration cavity 2 and the choke 3.
[0078]
Therefore, the adjacent oxygen-free copper disks 4 and 4 are integrated by sandwiching and joining the metal disks 22 provided with the ring-shaped SiCs 21. Further, cooling water is supplied to the outside of the metal disks 22. A cooling pipe or a cooling water jacket 23 for flowing is provided.
[0079]
Therefore, according to the configuration of the above-described embodiment, the same functions and effects as those of the third embodiment are exhibited, and the acceleration cavity 2 is cut by joining the ring-shaped SiC 21 to the metal cylinder 22. The ring-shaped SiC 21 serving as an electromagnetic wave absorber is not joined to the oxygen-free copper disk 4 thus formed, the deformation of the acceleration cavity 2 is reduced, the assembling accuracy of the acceleration tube is improved, and the induction of a wake field can be suppressed.
[0080]
In the above embodiment, the ring-shaped SiC 21 is joined to the inner surface of the metal cylinder 22.
[0081]
Further, the shape of SiC 21 is not limited to a ring shape, but may be a sector shape.
[0082]
FIG. 9 shows another example of the present embodiment, and is a cross-sectional view along a central axis of a regular cell portion of a choke mode cavity acceleration tube. 8, the same or similar members as those in FIG. 8 are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0083]
In this embodiment, the metal cylinder 22 and the ring-shaped SiC 21 are connected by joining or shrink fitting, but other connection examples may be used. For example, a metal layer 26 may be formed on the contact surface between the ring-shaped SiC 21 to be shrink-fitted and the metal cylinder 22 by metallization with Mo-Mn or silver plating after metallization to connect.
[0084]
Thereby, the thermal contact at the boundary between the ring-shaped SiC 21 and the metal cylinder 22 is improved as compared with the case where the SiC and the oxygen-free copper are in direct contact, and is generated inside the ring-shaped SiC 21 by the absorption of the wake field 37. Heat can be easily removed, and the temperature rise of the ring-shaped SiC 21 can be suppressed. Needless to say, other functions and effects are the same as those of the fifth embodiment.
[0085]
(Sixth embodiment)
FIG. 10 is a view showing another embodiment of the accelerating tube according to the present invention, and specifically, is a cross-sectional view along a central axis of a regular cell portion of the choke mode cavity accelerating tube. Note that in this figure, the same or similar members as those in FIGS. 6 to 9 are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0086]
In this embodiment, a collar for joining the ring-shaped SiC 21 to the inner surface of the metal cylinder 22 is provided.
[0087]
More specifically, the regular cell portion of the acceleration tube has a beam bore 1 at the center for allowing particles to be accelerated to pass therethrough, and cuts the acceleration cavity 2 and the choke 3 outward of the beam bore 1. The oxygen-free copper disks 4 are arranged at predetermined intervals so that the centers of the respective beam bores 1 are aligned. Then, both surfaces of the metal cylinder 22 are joined so as to be sandwiched in the vicinity of the peripheral portion of the adjacent oxygen-free copper disk 4. A collar 27 protrudes from the inner surface of the metal cylinder 22, and a ring-shaped SiC 21 is joined to both surfaces of the collar 27.
[0088]
Further, a cooling pipe or a cooling water jacket 23 for flowing cooling water outside the metal cylinder 22 is provided.
[0089]
According to the structure of this embodiment, the same functions and effects as those of the third embodiment can be obtained, and the ring-shaped SiC 21 is joined to the flange 27 protruding from the inner surface of the metal cylinder 22, thereby accelerating the cavity. There is no need to bond the electromagnetic wave absorber SiC to the oxygen-free copper disk 4 obtained by cutting the 2, so that the deformation of the acceleration cavity 2 can be reduced, the accuracy of assembling the acceleration tube can be improved, and the induction of the wake field is suppressed. can do.
[0090]
The shape of SiC is not limited to a ring shape, but may be various shapes such as a coin shape, a rectangular parallelepiped, and a fan shape.
[0091]
(Seventh embodiment)
FIG. 11 is a view showing another embodiment of the acceleration tube according to the present invention, and is a sectional view along a central axis of a regular cell portion of the acceleration tube. 6, the same or similar members as those in FIG. 6 are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0092]
In this embodiment, every other oxygen-free copper disk 4 is divided at the choke 3 into two members, and the two members are integrated after joining the ring-shaped SiC.
[0093]
Specifically, the regular cell portion of the accelerating tube has a beam bore 1 at the center for allowing particles to be accelerated to pass therethrough, and an accelerating cavity 2 and a choke 3 cut out of the beam bore 1 in an oxygen-free copper. The disks 4 are arranged at predetermined intervals so that the centers of the respective beam bores 1 are aligned.
[0094]
Among the oxygen-free copper disks 4, in the third embodiment, the ring-shaped SiC 21 is joined to both sides of the oxygen-free copper disks 4 arranged alternately, but in the present embodiment, The oxygen-free copper disc 4 on the side to which the ring-shaped SiC 21 is joined is divided at the choke 3 into two members 4a and 4b.
[0095]
The two members 4a and 4b are joined when the ring-shaped SiC 21 as the electromagnetic wave absorber is joined, and the metal cylinder 22 is sandwiched between the adjacent oxygen-free copper disks 4 to be joined and integrated.
[0096]
According to the configuration of this embodiment, the same functions and effects as those of the third embodiment can be obtained, and the following operations and effects can be obtained.
[0097]
In other words, SiC and oxygen-free copper have different physical properties and are easily deformed by a rise in temperature due to bonding.
[0098]
Therefore, in the present embodiment, deformation after the joining of the acceleration cavity 2 can be reduced by performing the finishing after annealing after joining the member 4a and the ring-shaped SiC 21. Thereby, the assembling accuracy of the acceleration tube is improved, and the induction of the wake field can be suppressed.
[0099]
The shape of SiC is not limited to a ring shape, but may be various shapes such as a coin shape, a rectangular parallelepiped, and a fan shape.
[0100]
(Eighth embodiment)
FIG. 12 is a view showing another embodiment of the accelerating tube according to the present invention, and is a sectional view along a central axis of a regular cell portion of the choke mode cavity accelerating tube. In the drawing, the same or similar members as those in the above-mentioned drawings are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0101]
In this embodiment, the cooling pipe or the cooling water jacket described in the second embodiment and the other embodiments is omitted, and a cooling water passage is provided in the inner circumferential direction of the oxygen-free copper disc.
[0102]
Specifically, the regular cell portion of the accelerating tube cuts the cooling water channel in the outer circumferential direction of the oxygen-free copper disk 4 from which the acceleration cavity 2 and the choke 3 have been cut at the time of roughing, and then closes the cooling water channel lid 31 from the outside. The cooling water passage 32 is formed in the inner circumferential direction of the oxygen-free copper disk 4 by covering and joining and performing finishing.
[0103]
The cooling water passage 32 may be formed by cutting from a flat surface of the oxygen-free copper disk 4a, for example, a bonding surface of SiC. At this time, the ring-shaped SiC 21 plays the role of a lid.
[0104]
Therefore, according to the configuration of the above-described embodiment, the same operation and effect as those of the second embodiment can be obtained, and the exclusive cooling water channel 7 or the cooling water channel used in the second embodiment and the like can be used. Since the water jacket 23 can be omitted, complicated work such as simultaneous joining of the cooling water passage 7 and SiC or joining of the cooling water passage after SiC joining becomes unnecessary. In addition, the physical properties of SiC and oxygen-free copper are different, and deformation of the acceleration cavity 2 and the like is likely to occur due to a rise in temperature during joining. However, as described above, the necessity of joining the dedicated cooling water channel 7 or the cooling water jacket 23 can be eliminated. For example, the deformation of the accelerating cavity 2 after joining is reduced, the assembling accuracy of the accelerating tube is improved, and the induction of the wake field can be suppressed.
[0105]
(Ninth embodiment)
FIG. 13 is a view showing another embodiment of the accelerating tube according to the present invention, and is a sectional view along a central axis of a regular cell portion of the choke mode cavity accelerating tube. In the figure, the same reference numerals are given to the same or similar members as those in the respective drawings, and the detailed description thereof will be omitted.
[0106]
In this embodiment, the cooling water jacket 23 is provided outside the oxygen-free copper disk 4 and the metal cylinder 22 in the third embodiment, but the inside of the oxygen-free copper disk 4 and the metal cylinder 22 To form a cooling water passage.
[0107]
Specifically, the regular cell portion of the accelerating tube integrates the oxygen-free copper disk 4 and the metal cylinder 22 and then connects the oxygen-free copper disk 4 and the metal cylinder 22 in the longitudinal direction of the accelerating tube. The cooling water passage 33 is formed so as to penetrate the cooling pipe 7 or the cooling water jacket 23 for flowing the cooling water. The cooling water channel 33 is formed by cutting a water channel hole at a predetermined position so that a water channel is formed when both the oxygen-free copper disk 4 and the metal cylinder 22 are bonded in advance. May be formed.
[0108]
Therefore, according to the configuration of this embodiment, in addition to the same operation and effect as the second and third embodiments, the cooling pipe 7 or the cooling water jacket 23 becomes unnecessary as described above, and the cost is reduced. And assembly work can be simplified.
[0109]
(Tenth embodiment)
FIG. 14 is a view showing another embodiment of the accelerating tube according to the present invention, and is a sectional view taken along a central axis of a regular cell portion of the choke mode cavity accelerating tube. In the figure, the same reference numerals are given to members similar to those in each of the above drawings except for the same parts, and detailed description thereof will be omitted.
[0110]
In this embodiment, the ring-shaped SiC 21 is bonded to both surfaces of every other oxygen-free copper disk 4 in the ninth embodiment, but the ring-shaped SiC 21 is attached to one surface of each oxygen-free copper disk 4. It is joined.
[0111]
That is, the regular cell portion of this accelerator tube has a simple configuration by joining a ring-shaped SiC 21 to any one surface of all the oxygen-free copper disks 4 as shown in FIG. An effect similar to that of the ninth embodiment is achieved.
[0112]
The shape of SiC is not limited to a ring shape, but may be various shapes such as a coin shape, a rectangular parallelepiped, and a fan shape.
[0113]
(Eleventh embodiment)
FIG. 15 is a view showing another embodiment of the accelerating tube according to the present invention, and is a sectional view along a central axis of a regular cell portion of the choke mode cavity accelerating tube. In the figure, the same reference numerals are given to the same or similar members as those in the respective drawings, and the detailed description thereof will be omitted.
[0114]
This embodiment is a combination of the third embodiment and the tenth embodiment.
[0115]
That is, the regular cell portion of the accelerating tube is provided with a cooling water jacket 23 for flowing cooling water outside the integrated oxygen-free copper disk 4 and the metal cylinder 22, while all oxygen-free copper circles are provided. By joining the ring-shaped SiC 21 to one of the surfaces of the plate 4, the same operation and effect as in the third and tenth embodiments can be obtained.
[0116]
The shape of SiC is not limited to a ring shape, but may be various shapes such as a coin shape, a rectangular parallelepiped, and a fan shape.
[0117]
(Twelfth embodiment)
FIG. 16 is a view showing another embodiment of the accelerating tube according to the present invention, and is a sectional view along a central axis of a regular cell portion of the choke mode cavity accelerating tube. In the same figure, members that are the same as or similar to those in FIG. 10 are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0118]
This embodiment is different from the sixth embodiment in that the metal cylinder 22 is omitted and the flange 27 protruding from the metal cylinder 22 is used instead of the adjacent oxygen-free copper disks 4, 4. A metal ring 35 is interposed and joined, and a ring-shaped SiC 21 is joined to both sides of the metal ring 35.
[0119]
That is, the regular cell portion of the accelerating tube is formed by joining the ring-shaped SiC 21 to both inside surfaces of the metal ring 35 instead of the flange 27 protruding from the metal cylinder 22 in the sixth embodiment. A configuration in which the oxygen-free copper disk 4, the metal ring 35, and the ring-shaped SiC 21 are integrated by joining the outer surfaces of the metal ring 35 by sandwiching them between the adjacent oxygen-free copper disks 4 and 4. It is. The cooling pipe 7 or the cooling water jacket 23 is provided outside the oxygen-free copper disk 4.
[0120]
According to the configuration of this embodiment, by reducing the number of metal cylinders 22 in the sixth embodiment, it is possible to reduce the cost and man-hour for machining and assembly, and to further reduce the acceleration cavity 2. Since it is not necessary to join SiC, which is an electromagnetic wave absorber, to the cut oxygen-free copper disk 4, deformation of the acceleration cavity 2 is reduced, and assembling accuracy of the acceleration tube is improved, and induction of a wake field can be suppressed.
[0121]
The shape of SiC is not limited to a ring shape, but may be various shapes such as a coin shape, a rectangular parallelepiped, and a fan shape.
[0122]
(Thirteenth embodiment)
17 and 18 are views showing another embodiment of the accelerating tube according to the present invention, and more specifically, sectional views taken along a central axis of a regular cell portion of the choke mode cavity accelerating tube. 17 is a sectional view taken along the line FF shown in FIG. 18, and FIG. 18 is a sectional view taken along the line EE shown in FIG. In the same drawing, the same or similar members as those in FIGS. 10 and 16 are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0123]
This embodiment is another example of the twelfth embodiment.
[0124]
That is, the regular cell portion of the accelerating tube is inserted and joined with the metal ring 35a so as to be sandwiched between the adjacent oxygen-free copper disks 4 and 4, and the ring-shaped SiCs 21a and 21b are provided on both inner surfaces of the metal ring 35a. Are the same as in the twelfth embodiment.
[0125]
What is particularly different is a configuration in which a plurality of slots 36,... Are provided in a circumferential direction between a portion of the metal ring 35a joined to the oxygen-free copper disk 4 and a portion joined to the ring-shaped SiCs 21a, 21b. is there.
[0126]
According to the configuration of such an embodiment, the wake field 37 that has propagated along the ring-shaped SiC 21a joined to one surface of the metal ring 35a passes through the slot 36 formed in the circumferential direction, and It wraps around the other surface of the ring 35a and propagates along the ring-shaped SiC 21b joined to the wrapped surface. As a result, the distance over which the wake field 37 propagates along the ring-shaped SiCs 21a and 21b becomes longer, and further attenuation of the wake field 37 can be expected.
[0127]
Needless to say, other functions and effects are the same as those of the twelfth embodiment.
[0128]
【The invention's effect】
As described above, according to the present invention, the following various effects can be obtained.
[0129]
According to the first aspect of the present invention, the electromagnetic wave absorber does not affect the high-frequency power, absorbs the wake field drawn out, can be sufficiently attenuated before reaching the vacuum jacket, and has an end portion of the radial line waveguide. The influence of the wake field that is reflected and reenters the acceleration cavity can be eliminated, and beam stability can be ensured even during high current acceleration. Further, since the coupler cells are provided on both outer sides of the vacuum jacket, the position of the accelerator can be easily adjusted, and the adjustment accuracy can be improved.
[0130]
According to the second aspect of the present invention, the ring-shaped electromagnetic wave absorber is interposed between the metal plates so that the vacuum jacket can be eliminated, and the metal plate is provided with the ring-shaped electromagnetic wave absorber so as to include the acceleration cavity and the choke. Thus, the wake field can be sufficiently attenuated, the influence of the wake field reflected and re-entered into the acceleration cavity can be eliminated, and the beam stability can be ensured even during high-current acceleration. In addition, since the cooling pipe is installed outside the ring-shaped electromagnetic wave absorber, the cooling pipe is installed in the atmosphere, so that there is no fear of accidental leakage of cooling water into vacuum, and further reliability can be secured.
[0131]
According to the third aspect of the present invention, the electromagnetic wave absorber is provided on both sides of the metal plate so as to be located outside the acceleration cavity and the choke. The beam can be attenuated and beam stability can be ensured even during high current acceleration. In addition, all metal plates are integrated by inserting a metal cylinder between metal plates, eliminating the need for a vacuum jacket and eliminating the risk of leakage of cooling water into the vacuum, further ensuring reliability. it can. Further, since the electromagnetic wave absorbers are provided on both sides of the metal plate, the stress can be reduced by the balance on both sides, and the deformation of the acceleration cavity and the choke can be suppressed, and the positional accuracy can be improved.
[0132]
Further, in the invention of claim 4, since the electromagnetic wave absorber is provided on both sides of the second metal plate which does not cut chalk or the like, the wake field can be absorbed and attenuated, and the beam instability can be ensured even at the time of large current acceleration. In addition, since the stress and the temperature rise at the time of joining do not affect the first metal plate obtained by cutting the acceleration cavity and the choke, deformation of the acceleration cavity and the choke can be eliminated, and the assembling accuracy of the accelerating tube can be improved. Induction of the wake field can be reliably suppressed.
[0133]
Furthermore, in the fifth aspect of the present invention, the metal cylinder is interposed between the metal plates, and the electromagnetic wave absorber is provided on the inner surface of the metal cylinder. In addition to having the same action as described above, since the electromagnetic wave absorber is not provided on the surface of the metal plate, the deformation of the acceleration cavity and the choke can be eliminated, and the assembling accuracy of the acceleration tube can be improved.
[0134]
Furthermore, in the invention of claim 6, since the inner surface of the metal cylinder interposed between the metal plates is provided with a flange having an inner diameter including the acceleration cavity and the choke, the electromagnetic wave absorber is provided on the metal plate. Since it is not installed, the deformation of the acceleration cavity and the like can be eliminated, and the assembling accuracy of the acceleration tube can be improved and the induction of the wake field can be reliably suppressed.
[0135]
Further, in the invention according to claim 7, the metal member on which the electromagnetic wave absorber is disposed on both surfaces is divided into two members by chalk portions, and the two members are joined after attaching the electromagnetic wave absorber to the metal member. Even when the metal body and the electromagnetic wave absorber have different physical property values, it is possible to suppress the deformation of the acceleration cavity, which is easily deformed due to a rise in temperature at the time of joining, to improve the assembling accuracy of the acceleration tube and to reliably suppress the induction of the wake field.
[0136]
Further, in the invention of claim 8, since the cooling water passage is provided by cutting the inside of the metal plate, there is no need to join the cooling water passage, the deformation of the acceleration cavity due to the joining is small, and the assembling accuracy of the acceleration tube is reduced. improves. In addition, since the ring-shaped electromagnetic wave absorber is arranged between the metal plates so as to include the acceleration cavity and the choke, the wake field can be sufficiently attenuated, and the influence of the wake field reflected and re-entering the acceleration cavity is eliminated, Beam instability can be ensured even during high current acceleration.
[0137]
Further, in the ninth aspect of the present invention, the same effect as that of the eighth aspect is obtained by providing the electromagnetic wave absorber on both surfaces of every other metal plate so as to be located outside the acceleration cavity and the choke. Since the cooling water passage formed through the metal plate and the metal cylinder inserted between the metal plates is provided, a cooling pipe and a cooling water jacket are not required, thereby reducing costs and simplifying assembly work. Can be realized.
[0138]
Further, according to the tenth aspect of the present invention, an electromagnetic wave absorber is provided on any surface of each metal plate so as to be located outside the acceleration cavity and the choke. , Which contributes to the simplification of the configuration, and also provides a cooling water passage formed through a metal plate and a metal cylinder interposed between the metal plates, so that cooling piping and a cooling water jacket are not required, The cost can be reduced and the assembling operation can be simplified.
[0139]
Furthermore, in the invention of claim 11, in addition to having the same effects as in claim 10, it is possible to solve the problem of the accident of leakage of the cooling water into the vacuum and further improve the reliability.
[0140]
Further, in the twelfth aspect of the present invention, since a metal ring having a diameter including the acceleration cavity and the choke is interposed between the metal plates, it is possible to reduce the number of metal cylinders and to reduce processing and man-hours. Further, by providing the electromagnetic wave absorber on a metal ring different from the metal plate, the deformation of the acceleration cavity can be reduced, the accuracy of assembling the acceleration tube can be improved, and the induction of the wake field can be suppressed.
[0141]
According to the thirteenth aspect, in addition to the same effect as the tenth aspect, by providing a slot in the metal ring, the propagation distance of the wake field becomes longer, and further attenuation of the wake field can be expected.
[Brief description of the drawings]
FIG. 1 is a sectional view taken along a central axis of an embodiment of a regular cell portion of an acceleration tube according to the present invention.
FIG. 2 is a view taken along the line AA shown in FIG.
FIG. 3 is a sectional view taken along a central axis of one embodiment of a coupler cell portion of the acceleration tube according to the present invention.
FIG. 4 is a sectional view taken along a central axis of another embodiment of the regular cell portion of the acceleration tube according to the present invention.
FIG. 5 is a view taken along the line CC shown in FIG. 4;
FIG. 6 is a sectional view taken along a central axis of still another embodiment of a regular cell portion of the acceleration tube according to the present invention.
FIG. 7 is a sectional view taken along a central axis of still another embodiment of the regular cell portion of the acceleration tube according to the present invention.
FIG. 8 is a sectional view taken along a central axis of still another embodiment of the regular cell portion of the acceleration tube according to the present invention.
FIG. 9 is a cross-sectional view taken along a central axis in still another embodiment of the regular cell portion of the acceleration tube according to the present invention.
FIG. 10 is a sectional view taken along a central axis of still another embodiment of the regular cell portion of the acceleration tube according to the present invention.
FIG. 11 is a cross-sectional view taken along a central axis in still another embodiment of the regular cell portion of the acceleration tube according to the present invention.
FIG. 12 is a cross-sectional view taken along a central axis of still another embodiment of the regular cell portion of the acceleration tube according to the present invention.
FIG. 13 is a sectional view taken along a central axis of still another embodiment of the regular cell portion of the acceleration tube according to the present invention.
FIG. 14 is a sectional view taken along a central axis of still another embodiment of the regular cell portion of the acceleration tube according to the present invention.
FIG. 15 is a sectional view taken along a central axis of still another embodiment of the regular cell portion of the acceleration tube according to the present invention.
FIG. 16 is a sectional view taken along a central axis of still another embodiment of the regular cell portion of the acceleration tube according to the present invention.
FIG. 17 is a cross-sectional view taken along a central axis in still another embodiment of the regular cell portion of the acceleration tube according to the present invention.
FIG. 18 is a view as seen from the direction of arrows EE shown in FIG. 17;
FIG. 19 is an explanatory diagram of a conventional disc-loaded traveling wave accelerator.
FIG. 20 is a sectional view taken along a central axis of a regular cell portion using a conventional choke mode cavity.
FIG. 21 is an explanatory diagram of an acceleration tube using a conventional choke mode cavity.
FIG. 22 is a view taken in the direction of arrows GG shown in FIG. 21;
[Explanation of symbols]
1 ... Beam bore
2 ... Acceleration cavity
3. Chalk
4,24,25… Oxygen-free copper disc
5. Electromagnetic wave absorber
6. Radial line waveguide
8. Vacuum jacket
11 ... Coupler cell
21 ... Electromagnetic wave absorber
22 Metallic cylinder
23 Cooling water jacket
27 ... Spit
32, 33 ... cooling water channel
35,35a ... Metal ring

Claims (13)

A through-hole for passing the particles to be accelerated is provided at the center, and a metal plate obtained by cutting a choke for preventing leakage of the high-frequency power and an acceleration cavity for accelerating the energy of the particles to be accelerated by high-frequency power on one side is provided. In accelerator tubes arranged at intervals,
An electromagnetic wave absorber interposed between the adjacent metal plates so as to be positioned outside the choke to integrate all the metal plates, and to absorb high-frequency power other than the acceleration mode drawn out from the acceleration cavity; and And a cooling pipe installed so as to penetrate outside the choke, a vacuum jacket provided so as to surround all integrated metal plates, and a center accelerated. An accelerating tube, comprising: a through-hole for allowing particles to pass through; and a coupler cell provided at both ends of the vacuum jacket for coupling to an external high-frequency transmission system. A through-hole for passing the particles to be accelerated is provided at the center, and a metal plate obtained by cutting a choke for preventing leakage of the high-frequency power and an acceleration cavity for accelerating the energy of the particles to be accelerated by high-frequency power on one side is provided. In accelerator tubes arranged at intervals,
A ring having an inner diameter including the acceleration cavity and the choke, connecting between adjacent metal plates to integrate all metal plates, and absorbing a high-frequency power other than the acceleration mode drawn out of the acceleration cavity; An accelerating tube comprising: an electromagnetic wave absorber; and a cooling pipe penetrating through the metal plate so as to be located outside the ring-shaped electromagnetic absorber. A through-hole for passing the particles to be accelerated is provided at the center, and a metal plate obtained by cutting a choke for preventing leakage of the high-frequency power and an acceleration cavity for accelerating the energy of the particles to be accelerated by high-frequency power on one side is provided. In accelerator tubes arranged at intervals,
An electromagnetic wave absorber provided on both sides of every other metal plate so as to be located outside the acceleration cavity and the choke and absorbing high-frequency power other than the acceleration mode extracted from the acceleration cavity; A metal cylinder having an inner diameter including the chalk and the electromagnetic wave absorber and connecting all metal plates by connecting between adjacent metal plates, and an outer side of the metal cylinder and the metal plate. And a cooling pipe or a jacket arranged for flowing cooling water. A first metal plate provided with a through-hole at the center thereof for allowing the particles to be accelerated to pass therethrough, and an acceleration cavity for accelerating the energy of the particles to be accelerated by high-frequency power on both sides and a choke for preventing leakage of the high-frequency power; And a metal plate arranging means in which a through hole for passing particles to be accelerated is provided at the center, and the acceleration cavity and the second metal plate which does not cut the choke are alternately arranged at a predetermined interval,
An electromagnetic wave absorber arranged on both surfaces of the second metal plate so as to be located outside the acceleration cavity and the choke of the first metal plate and absorbing high-frequency power other than the acceleration mode extracted from the acceleration cavity; A metal cylinder having an inner diameter including the acceleration cavity, the choke and the electromagnetic wave absorber, and integrating all metal plates by connecting between adjacent metal plates; An accelerating pipe, comprising: a cooling pipe or a jacket disposed outside the metal plate for flowing cooling water. A metal plate is provided with a through-hole at the center for passing the particles to be accelerated, and a metal plate cut on one side with an acceleration cavity for accelerating the energy of the particles to be accelerated by high-frequency power and a choke for preventing leakage of the high-frequency power. Accelerator tubes arranged at intervals of
A metal cylinder having an inner diameter including the accelerating cavity and the choke, and joining all the metal plates by joining between the adjacent metal plates; and An electromagnetic wave absorber that is connected to be located outside the cavity and the choke and absorbs high-frequency power other than in the acceleration mode drawn out of the acceleration cavity; and an electromagnetic wave absorber that is disposed outside the metal cylinder and the metal plate. An acceleration tube comprising a cooling pipe or a jacket for flowing water. A through-hole for passing the particles to be accelerated is provided at the center, and a metal plate obtained by cutting a choke for preventing leakage of the high-frequency power and an acceleration cavity for accelerating the energy of the particles to be accelerated by high-frequency power on one side is provided. In accelerator tubes arranged at intervals,
A metal cylinder having an inner diameter such as to include the acceleration cavity and the choke and having a flange on the inner surface, and joining all the metal plates by joining between the adjacent metal plates,
An electromagnetic wave absorber that is provided on both sides of the collar of the metal cylinder and absorbs high-frequency power other than the acceleration mode drawn out of the acceleration cavity, and that is arranged outside the metal cylinder and the metal plate to flow cooling water. An accelerating tube comprising: a cooling pipe or a jacket. The metal body having an electromagnetic wave absorber disposed on both surfaces is composed of two members divided by the choke, and the two members are joined after attaching the electromagnetic wave absorber to the metal body. 3. The acceleration tube according to 3. A through-hole for passing the particles to be accelerated is provided at the center, and a metal plate obtained by cutting a choke for preventing leakage of the high-frequency power and an acceleration cavity for accelerating the energy of the particles to be accelerated by high-frequency power on one side is provided. In accelerator tubes arranged at intervals,
A ring shape having an inner diameter including the acceleration cavity and the choke, joining between adjacent metal plates to integrate all metal plates, and absorbing high-frequency power other than the acceleration mode drawn out of the acceleration cavity. An acceleration tube comprising: an electromagnetic wave absorber; and a cooling water channel formed by cutting the metal plate to a predetermined depth inside and joining a lid to an opening portion thereof. A through-hole for passing the particles to be accelerated is provided at the center, and a metal plate obtained by cutting a choke for preventing leakage of the high-frequency power and an acceleration cavity for accelerating the energy of the particles to be accelerated by high-frequency power on one side is provided. In accelerator tubes arranged at intervals,
A metal cylinder having an inner diameter including the accelerating cavity and the choke, joining between the adjacent metal plates to integrate all the metal plates, and an inner surface of the metal cylinder; An acceleration mode that is disposed on either one of both sides of a brim protruding from the inner surface of the cylinder and every other side of the metal plate so as to be located outside the acceleration cavity and the choke, and is drawn out of the acceleration cavity An acceleration tube comprising: an electromagnetic wave absorber that absorbs high frequency power other than the above; and a cooling water passage formed through the metal plate and the metal cylinder. A metal plate is provided with a through-hole at the center for passing the particles to be accelerated, and a metal plate cut on one side with an acceleration cavity for accelerating the energy of the particles to be accelerated by high-frequency power and a choke for preventing leakage of the high-frequency power. Accelerator tubes arranged at intervals of
An electromagnetic wave absorber provided on any one surface of each of the metal plates so as to be located outside the acceleration cavity and the choke, and absorbing a high-frequency power other than an acceleration mode drawn from the acceleration cavity; A metal cylinder having an inner diameter including the cavity and the choke and being interposed between the adjacent metal plates to integrate all the metal plates, and formed through the metal plate and the metal cylinder. A cooling water passage. A through-hole is provided at the center for allowing the accelerated particles to pass therethrough, and a metal plate obtained by cutting an acceleration cavity for accelerating the energy of the accelerated particles with high-frequency power on one side and a choke for preventing leakage of the high-frequency power is provided on a predetermined surface. Accelerator tubes arranged at intervals of
An electromagnetic wave absorber provided on any surface of each of the metal plates so as to be located outside the acceleration cavity and the choke, and absorbing high-frequency power other than the acceleration mode extracted from the acceleration cavity; And a metal cylinder having an inner diameter including the chalk and interposed between the adjacent metal plates to integrate all the metal plates, and cooling water disposed outside the metal plate and the metal cylinder. And a cooling pipe or a jacket for flowing air. A through-hole for passing the particles to be accelerated is provided at the center, and a metal plate obtained by cutting a choke for preventing leakage of the high-frequency power and an acceleration cavity for accelerating the energy of the particles to be accelerated by high-frequency power on one side is provided. In accelerator tubes arranged at intervals,
A metal ring having a diameter that includes the acceleration cavity and the choke and inserted between the adjacent metal plates to integrate all the metal plates, and a metal ring disposed on both sides of the metal ring; An electromagnetic wave absorber that absorbs high-frequency power other than the acceleration mode drawn out of the cavity, and a cooling pipe or jacket that is disposed outside a metal plate including the metal ring and flows cooling water. Acceleration tube. A through-hole for passing the particles to be accelerated is provided at the center, and a metal plate obtained by cutting a choke for preventing leakage of the high-frequency power and an acceleration cavity for accelerating the energy of the particles to be accelerated by high-frequency power on one side is provided. In accelerator tubes arranged at intervals,
A metal ring having a diameter that includes the acceleration cavity and the choke and inserted between the adjacent metal plates to integrate all the metal plates, and a metal ring disposed on both sides of the metal ring; An electromagnetic wave absorber that absorbs high-frequency power other than the acceleration mode extracted from the cavity, a cooling pipe or jacket disposed outside a metal plate including the metal ring, and a cooling pipe or jacket for flowing cooling water, and the electromagnetic wave of the metal ring An acceleration tube comprising: a plurality of slots formed in a circumferential direction on an outer side of the absorber.

Images