JPS5983325A - Gyrotron device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a large E'IL Camillimeter wave electron tube (hereinafter referred to as a gyrotron) suitable for heating plasma in a nuclear fusion device.

[Prior art]

Recently, a gyrotron using the principle of zychrotron resonance has been developed, and it has been applied to the electron zychrotron (1q heating (ECRH)) of fusion plasma, and has good compatibility with nuclear fusion reactors. The effectiveness of the gyrotron is being demonstrated.There are many documents on the principles and applications of this gyrotron, such as the one introduced in the Journal of the Institute of Electrical Engineers of Japan, Vol. 99, No. 9 (Nos. 46-49).

FIG. 1-5 is a cross-sectional view of a conventional gyrotron device. In FIG. 1, the tube body 10 is connected to a vacuum pump (not shown), is airtightly sealed, and has an electron gun 12 disposed at one end. A resonance cavity 14 is formed in front of the electron gun 12 to accelerate the electron beam emitted from the electron gun 12. The electron beam accelerated in the resonant cavity 14 is delivered to the high frequency output unit 18 via the electron beam collector 16, and is irradiated onto plasma of a fusion reactor (not shown).

1; Around the electron gun 12, an lζth magnetic field coil 20 is arranged to focus the electron beam, and around the resonant cavity 14, 1. i) A main magnetic field coil 22 is provided to accelerate the electron beam. What about Figure 1? Components such as the cooling piping that cools the bulb body 10 and the main magnetic field coil 22, each 1+R wiring, the jacket, and the evacuation device that evacuates the bulb body 10 are installed. It is omitted.

In this gyrotron device, the outer diameter of the tube main body 10 is about 200mmφ x 3000mm, and the maximum outer diameter of the main magnetic field coil is about 800mmφ.

Then, a magnetic field of about IT (terrace) is generated inside the main magnetic field coil 22, and a high frequency output of 28 GlIZ and 200 kW can be obtained using an 80 kV, 8 A electronic vino.

ECIL fusion plasma in gyrotron device
The frequency fECR of the high frequency power for H heating is given by the following equation.

fzcn= 28 X 10' B (f-
IZ) where B is the magnetic flux density in the plasma region in units of terraces.

In a nuclear fusion reactor in which the plasma is of a magnetic confinement type, a magnetic flux density B of at least 3 to 5 T or more must be used, and in a gyrotron, a high frequency high power of 90 to 150 GH2O is required. .

However, as the frequency increases, it is necessary to reduce the inner diameter of the resonant cavity 14 in almost inverse proportion to this.

Moreover, when the frequency is increased, the inner diameter of the resonant cavity appropriate for it is determined depending on the resonance conditions, etc., and it is necessary to determine the inner diameter of the resonant cavity 14 within the restricted range. Therefore, for very short waves such as millimeter waves, the inner diameter of the resonant cavity 14 cannot be made larger than several tens of meters, and the higher the frequency, the smaller the inner diameter of the resonant cavity 14 needs to be. As the size increases, the heat load on each component increases. As a result, gyrotron devices are technically difficult to oscillate and amplify with high power and over long periods of time.
In particular, the higher the frequency, the more difficult it becomes to maintain high power output for a long time, and as the frequency increases, it is necessary to lower the output power.

For the reasons mentioned above, with current gyrotron devices, continuous output of 100 kW or more can only be obtained at frequencies below 28 to 60 GHz (approximately 200 kW), and until now only full-scale JV C can be obtained in magnetic fields of 2 T or higher. t, c H
Unable to apply heat.

In addition, even in gyrotron devices of 60 GH2 or less that have been put into practical use, other fusion plasma heating means, such as neutral particle injection (NBI), ion cyclotron resonance heating (I CRH), and low-frequency hybrid wave heating ( [Objective of the Invention] The present invention has been made in order to eliminate the drawbacks of the above-mentioned prior art, and It is an object of the present invention to provide a gyrotron device that can easily obtain large electric power.

[Summary of the invention]

The present invention is configured such that a high-power electron beam can be easily obtained by arranging a plurality of tube bodies each including an electron gun, a resonant cavity, a collector, and a high-frequency output section within a magnetic field coil. It is.

[Embodiments of the invention]

A preferred embodiment of the gyrotron device according to the present invention will be described in detail with reference to the accompanying drawings.

Note that the same reference numerals are given to the parts corresponding to the parts explained in the prior art, and the explanation thereof will be omitted.

FIG. 2 is an explanatory diagram of one embodiment of the gyrotron device according to the present invention, and FIG. 3 is a sectional view taken along the line ■-■ in FIG. 2.

The gyrotron device of this embodiment is a so-called multi-tube composite gyrotron device in which a plurality of tube bodies are arranged within a magnetic field coil. That is, the magnetic field coil 30 that focuses the electron beam and the main magnetic field coil 32 that accelerates the electron beam are as follows.
It is divided into several parts and arranged as necessary, so that the distribution of the magnetic field can be adjusted appropriately. An electron gun 12 and a resonant cavity 14 are placed inside these magnetic field coils.
, '1 Shiiko Bee A::7 Receiver 16, high frequency output section 18, and other 'iT bulbs 10 are arranged as shown in Fig. 3, and one set of magnetic field It becomes possible to collect 7 high frequency outputs using a coil.The number of bulb bodies 10 must be 7, 2 or more. ”-, there is no limit to the number. Still, in FIGS. 2 and 3, the main magnetic field coil 32, a cooling device for cooling the tube body io, a support 4 structure, J' (empty pump, wiring, power supply, etc.) are omitted.

The magnetic field 30 and the main magnetic field 32 may be J-field magnets or conductive magnets.

However, higher frequencies require a higher magnetic field, i
It is preferable to use a magnet such as a second electric magnet.
In the figure and FIG. 3, the Kujiiostat in the case of using a super 'i7i S magnet is also omitted.

By sharing the magnetic field coil with multiple tube bodies as described above, large output can be obtained even when it is necessary to increase the frequency and reduce the inner diameter of the resonant cavity. be able to. That is, for example, the jyr of the z1 example
-+ Since the l-ron device suppresses the heat load within the allowable limit, even if the output of each tube body 10 is reduced at high frequencies, it is possible to obtain high-power high-frequency output by increasing the number of tube bodies 10. I can do it. For example, each tube body 1
If the output of 0 is zoolcw, then in the embodiment shown in FIGS. 2 and 3, the total output is 1. ．． 4MW
You can get the output of However, by sharing the magnetic coil 30 and the main magnetic field coil 32 with a plurality of tube bodies 10, the economic efficiency of each magnetic field coil is significantly improved. In addition to this, it is possible to downsize the gyrotron device.

Note that the magnetic field coil 30. If the main magnetic field coil 32 cannot provide an optimal magnetic field distribution to each tube body 10, for example, a small coil for magnetic field correction may be provided in each tube body 10 to adjust the magnetic field. You can also do this.

FIG. 4 is an explanatory diagram of another embodiment of the gyrotron device according to the present invention. In FIG. 4, each tube body 10 is
It is arranged in a common vacuum vessel 34. This common vacuum container 34 is evacuated by a vacuum pump (not shown) and maintained at a vacuum. The inside of the tube body 10 communicates with the inside of this common vacuum vessel 34, and the inside of the tube body 10, which is the trajectory of electrons, is evacuated via the common vacuum vessel 34. By adopting such a structure, the vacuum evacuation equipment becomes economical, and the structure of the tube main body 10 becomes [1 (j), which makes it easy to manufacture and makes it possible to reduce the external size. , the outer diameters of the magnetic field coil 30 and the main magnetic field coil 32 can be reduced, and economical efficiency can be significantly improved.

FIG. 5 shows another embodiment of the gyrotron device according to the present invention, and FIG. 6 is a cross-sectional view taken along the line ■-■ in FIG. In this embodiment, the magnetic field coil 30 and the main magnetic field coil 32 are connected to a common vacuum vessel 3 along with a tube body 40.
It is located within 6. Then, the tube main body 40 has a sixth
As shown in the figure, seven resonant cavities 14. Electron beam collector 16. It has a hole in which a high frequency output section 18 and the like are formed. Inner surface Q of this hole, (Le Kidenn, 1)
In addition, each high-frequency output section 18 is equipped with an output window 7ff, and the other end is machined with a mounting seat for the electron gun 12.
2 is attached. The tube body 40 may be processed by machining using a machine, or by precision casting, radio casting, or the like. In addition, the reference numeral 38 shown in FIG. 6 is water.

This is a coolant channel for circulating cooling fluid such as oil, liquid/body nitrogen, etc. By adopting such a structure, the multi-output tube body of the gyrotron device can be made extremely simple in structure and downsized.In general, the gyrotron device is used to generate fusion plasma. For heating, the output end of the gyrotron device and the main body of the fusion device are connected by a three-dimensional circuit, and high-frequency m-power is transmitted through this three-dimensional circuit. Therefore, according to the multi-output composite gyrotron device as shown in each of the above embodiments, high-frequency power is transmitted from each high-frequency output section to the multiple high-frequency heating boats of the fusion device main body via separate three-dimensional circuits. However, by heating the plasma by radiating it from the high-frequency radiating section provided in each port section, it is possible to significantly reduce losses when a plurality of outputs are combined or distributed.

〔Effect of the invention〕

As explained above, according to the present invention, a plurality of tube bodies share the @field coil, so that high-power high-frequency output can be easily obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional gyrotron device, FIG. 2 is an explanatory diagram of an embodiment of the gyrotron device according to the present invention, and FIG. 3 is a sectional view taken along the line ■-■ in FIG. FIG. 4 is an explanatory diagram of another embodiment of the gyrotron device according to the present invention, FIG. 5 is an explanatory diagram of still another embodiment of the gyrotron device according to the present invention, and FIG. It is a cross-sectional view along the -■ line. 10.40...Tube body, 12...Electron gun, 14.
... Resonance cavity, 16... Electron beam collector, 18.
...High frequency output section, 20.30...Magnetic field coil, 22
．． 32...Main magnetic field coil. Part I Part 2 Early 3 Senbō 4 Part 32 Fifth country 6 Part 6/6

Claims (1)

[Claims] 1. An electron gun that emits a ci beam, a resonant cavity provided in front of the electron gun to accelerate the electron beam, a collector that guides the accelerated electron beam in the resonant cavity, and an electron gun provided at the tip of the collector. In a gyrotron device having a tube main body having a high frequency output section and a magnetic field correction coil arranged around the tube main body, a plurality of the tube main bodies are provided within the magnetic field coil. Features a gyrotron device. 2. The gyrotron device according to claim 1, wherein each of the tube bodies has a magnetic field correction coil. 3. The plurality of tube bodies are housed in the same vacuum container, and the inside of each tube body communicates with this vacuum container! A gyrotron device according to claim 1 or 2.