CN113115504B

CN113115504B - ExB probe capable of guiding beam current

Info

Publication number: CN113115504B
Application number: CN202110367478.8A
Authority: CN
Inventors: 杨祖仪; 霍亮
Original assignee: Jiangsu Shenlan Aerospace Co ltd
Current assignee: Nantong Deep Blue Aerospace Technology Co.,Ltd.
Priority date: 2021-04-06
Filing date: 2021-04-06
Publication date: 2022-11-22
Anticipated expiration: 2041-04-06
Also published as: CN113115504A

Abstract

The utility model relates to a can lead to exB probe of line current, including the probe casing, the probe casing is installed collimator, electric field and is taken place part, magnetic field and take place part and collector part, and the outside winding of collimator is installed metal coil, and metal coil connects the power, can form axial magnetic field in the entry end and the through-hole of collimator after the metal coil circular telegram. In the application, when a beam current is in front of an inlet of an ExB probe collimator, the beam current is influenced by an axial magnetic field emitted from the inside of the collimator in advance and is restrained by the magnetic field of the collimator to a certain extent before entering the collimator; when the beam enters the collimator tube section at a certain angle, the beam can pass through the collimator tube in a magnetic field region inside the collimator tube in a constrained manner, reaches the interior of the ExB probe and reaches the collector part after passing through the electric field generating part and the magnetic field generating part to form ion current.

Description

ExB probe capable of guiding beam current

Technical Field

The disclosure relates to the technical field of aerospace, in particular to an ExB probe capable of guiding beam current.

Background

Space thrusters such as an ion thruster, a Hall thruster, an electrospray thruster and the like are widely applied to spacecraft orbit control and interstellar navigation due to higher specific impulse, longer service life and smaller system mass. The accurate acquisition of the vacuum plume parameters of the electric thruster is crucial to the evaluation of the performances of the electric thruster and the spacecraft; the vacuum plume of the electric thruster mainly comprises plasma which contains univalent ions, bivalent ions, electrons, neutral gas molecules and the like, and the obtained particle component distribution in the plume of the electric thruster is of great significance for the design of a magnetic field inside the thruster.

If the content of divalent ions or even trivalent ions in one thruster is high, the magnetic field in a discharge chamber inside the thruster is in an over-constrained state, that is, an area where electrons are intensively ionized exists in the discharge chamber, so that ionized particles are subjected to secondary bombardment of the electrons before being extracted, and further multivalent ions are formed, the plasma density in the area subjected to multiple ionization is higher than that in other areas, and a grid at the position is intensively damaged. The ExB probe is a contact type diagnostic tool capable of detecting the proportion of univalent or multivalent ions in the electric propulsion plume, and plays a very important role in preliminary diagnosis, check diagnosis or basic research of the electric propulsion.

The ExB probe mainly comprises four core components, namely a collimation component, an electric field generation component, a magnetic field generation component and a collector component. The function of the collimation component is to receive signals from a specific direction; the electric field generating component and the magnetic field generating component act together to screen ions with different charge quantities; the ions pass through the collimator, the electric field generating component and the magnetic field generating component and then reach the collector component to form ion current. Setting the ion current as a y axis and the bias electric field as an x axis, a current curve changing along with voltage can be obtained, the volt-ampere characteristic curve is effective data finally obtained by the ExB probe, and the distribution of the charge quantity of charged particles in a flow field can be analyzed by filtering, smoothing and the like on the area line. As shown in fig. 1, when ions enter the collimator and move inside the ExB probe, an upward force (upward in fig. 1) is formed by the ion current and the magnetic field direction, and an opposite force is applied by the electric field, under a specific voltage condition, the magnetic field force and the electric field force will cancel each other, and the ions can straightly enter the collection range of the collector to form a sampling current.

The conventional ExB probe has a problem that the relative position of the probe and the beam direction is extremely high, and if the ExB probe and the beam have a certain included angle, ions cannot pass through a collimator. The incoming beam current direction is related to the processing technology and the centering property of the grid electrode of the ion thruster; the factors are difficult to determine in simulation and experiment stages, so that the angle of the ExB probe needs to be continuously adjusted in an experiment to adapt to the incoming flow direction of ions in a plume, the experiment fluency and the data accuracy are seriously affected, and the current signal cannot be received no matter how the angle of the ExB probe is adjusted in some cases.

Generally, an effective way to solve the above problems is to increase the inner diameter of the collimator or shorten the length of the collimator, so that the ions can more easily pass through the collimator and enter the inside of the ExB probe. However, this method has a problem that ions entering the inside of the ExB probe are not necessarily all ion signals required by the measurement personnel, and the ions entering the inside of the ExB probe include not only beam ions to be measured but also CEX particles (charge exchange particles) and ions which do not normally operate, so that the measured voltammetry characteristic curve has a large amount of noise signals, and the current signals of divalent and trivalent ions are very easily buried in the noise signals for the smaller signal types. This approach is problematic with respect to data accuracy.

Therefore, the application provides an ExB probe capable of guiding beam current.

Disclosure of Invention

In order to solve at least one of the above technical problems, the present disclosure provides an ExB probe that can guide a beam current.

The technical scheme adopted by the invention is as follows:

the utility model provides a can lead to ExB probe of line current, includes the probe casing, the collimator, electric field generation part, magnetic field generation part and collector part are installed to the probe casing, metal coil is installed in the outside winding of collimator, metal coil connects the power, can be in after the metal coil circular telegram in the entry end and the through-hole formation axial magnetic field of collimator.

Preferably, a magnetic shoe structure is installed outside the collimator tube in a covering mode, the magnetic shoe structure is made of high-permeability materials, matching holes are formed in the front end and the rear end of the magnetic shoe structure, the matching holes are axially aligned with the through hole of the collimator tube, and the aperture of each matching hole is not smaller than that of the through hole.

Preferably, the magnetic shoe structure comprises a front magnetic shoe and a rear magnetic shoe, the rear magnetic shoe is detachably and fixedly connected with the probe shell, the rear end of the collimator tube is detachably and fixedly connected with the rear magnetic shoe, the front end of the collimator tube is detachably and fixedly connected with the front magnetic shoe, and the front magnetic shoe is tightly attached to the rear magnetic shoe to define a space for accommodating the collimator tube and the metal coil.

Preferably, the front magnetic shoe has a cylindrical body extending from a front end to a rear end, the rear end surface of the cylindrical body is in close contact with the rear magnetic shoe, and the cylindrical body has a receiving groove therein for receiving the metal coil.

Preferably, a power supply is connected to the cartridge, and the power supply can apply positive high voltage to the cartridge.

Preferably, back magnetic shoe rear end has the connection boss, the probe casing has the mounting hole, connection boss fixed mounting be in the mounting hole, back magnetic shoe has first mounting groove, collimator rear end fixed mounting be in the first mounting groove, preceding magnetic shoe has the second mounting groove, collimator front end fixed mounting be in the second mounting groove.

Preferably, the connecting boss is fixedly connected with the mounting hole through threads, the rear end of the collimator is fixedly connected with the first mounting groove through threads, and the front end of the collimator is fixedly connected with the second mounting groove through threads.

In summary, the axial magnetic field is generated by the energized metal coil, when the beam current is in front of the inlet of the ExB probe collimator, the beam current is influenced by the axial magnetic field emitted from the inside of the collimator in advance, and is constrained by the magnetic field of the collimator to a certain extent before entering the collimator; when the beam enters the collimator tube section at a certain angle, the beam passes through the collimator tube in a constrained manner in the magnetic field region inside the collimator tube and reaches the inside of the ExB probe, and the beam reaches the collector part after passing through the electric field generating part and the magnetic field generating part to form ion current.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

FIG. 1 is a schematic diagram of the main structure and operation of an ExB probe;

FIG. 2 is a cross-sectional view of a partial structural fit of the present invention;

FIG. 3 is a schematic view of FIG. 2 with the magnetic lines of force removed;

FIG. 4 is a cross-sectional view of a front magnetic shoe of the present invention;

FIG. 5 is a cross-sectional view of the rear magnetic shoe of the present invention;

FIG. 6 is a partial cross-sectional view of the probe housing of the present invention;

FIG. 7 is a graph of the velocity of ions versus force in an axial magnetic field in accordance with the present invention;

FIG. 8 is a schematic diagram of the helical progression of ions in an axial magnetic field according to the present invention;

FIG. 9 is a schematic diagram of a beam entering and passing through a collimator tube at an angle to the ExB probe.

The labels in the figure are: the probe comprises a probe shell 1, a collimator 2, a collector component 3, a metal coil 4, a through hole 5, a matching hole 6, a front magnetic shoe 7, a rear magnetic shoe 8, a cylinder 9, a containing groove 10, a connecting boss 11, a mounting hole 12, a first mounting groove 13 and a second mounting groove 14.

Detailed Description

The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Example 1

As shown in fig. 1 to 3 and 7 to 9, an ExB probe capable of guiding a beam comprises a probe housing 1, wherein the probe housing 1 is provided with a collimator 2, an electric field generating component, a magnetic field generating component and a collector component 3, a metal coil 4 is wound outside the collimator 2, the metal coil 4 is connected with a power supply, and an axial magnetic field can be formed in an inlet end of the collimator 2 and a through hole 5 after the metal coil 4 is electrified; the collimator 2 is fixedly arranged at the front end of the probe shell 1, the electric field generating component and the magnetic field generating component are both arranged inside the probe shell 1, the electric field generating component forms an electric field inside the probe shell 1, the magnetic field generating component forms a magnetic field inside the magnetic field, and the collector component 3 is fixedly arranged at the rear end of the probe shell 1.

Further, a magnetic shoe structure is covered and mounted on the outer portion of the collimator tube 2, the magnetic shoe structure is made of high-permeability materials, the specific materials are pure iron, matching holes 6 are formed in the front end and the rear end of the magnetic shoe structure, the matching holes 6 are axially aligned to the through hole 5 of the collimator tube 2, the aperture of the matching holes 6 is not smaller than that of the through hole 5, and specifically, the aperture of the matching holes 6 is the same as that of the through hole 5; the magnetism boots structure parcel lives collimator 2 and metal coil 4, and the magnetism boots structure is used for shielding other direction magnetic fields, does not shield axial magnetic field, with other direction magnetic field restrictions in the magnetism boots structure, avoids other direction magnetic fields to outwards disperse, influences the important part of spacecraft, and the magnetism boots structure does not influence the axial magnetic field in the collimator 2, does not influence the axial magnetic field of 2 front ends of collimator yet.

After the metal coil 4 is electrified, an axial magnetic field can be formed at the inlet end and inside the collimator 2, the axial magnetic field does not decelerate or accelerate the charged particles, and only changes the direction of the charged particles, as shown in fig. 7 to 9, when a certain included angle exists between the beam direction and the axis of the collimator 2, namely, the movement direction of ions and the axis of the collimator 2 form an included angle, the charged ions comprise two speed components, one is parallel to the axial magnetic field direction, and the other is vertical to the magnetic field direction, wherein the speed component parallel to the axial magnetic field direction is not acted by the magnetic field force, and only the speed component vertical to the magnetic field direction is acted by the magnetic field force, so that the movement state of the charged ions is changed; as shown in fig. 7, the axial magnetic field is in the direction of the paper surface, and the positively charged ions will be subjected to a centripetal force in the moving direction shown in fig. 7, so as to form a circular-like moving direction, and the moving speed of the ions along the axial direction will not change. Adding an axial velocity component to the motion state of fig. 7 results in a helical motion as shown in fig. 8; because the entrance of the collimator 2 and the collimator 2 both have axial magnetic fields, the above-mentioned spiral motion starts to form from the entrance of the collimator 2, i.e. when the beam current is in front of the entrance of the ExB probe collimator 2, it will be constrained by the axial magnetic field emitted from the collimator 2 in advance, and guide the ions to spirally advance and enter the collimator 2, and the axial magnetic field will continue to constrain the ions, reaching the above-mentioned spiral advancing mode, so to speak, if there is no axial magnetic field at the entrance of the collimator 2 and inside, the moving ions having an included angle with the collimator 2 will miss the entrance of the collimator 2, or even if entering the entrance of the collimator 2 with a certain included angle, will hit the inner wall of the collimator 2, and cannot reach the collector component 3 of the probe, and due to the existence of the axial magnetic field, the ions will be constrained by the axial magnetic field emitted from the collimator 2 in advance at the entrance of the collimator 2, and be smoothly introduced into the collimator 2, and in the collimator 2, after the ion spirals advance, will change its moving direction before hitting the collimator 2, so change the direction (i.e. the spiral advancing direction), and enter the inside of the collimator 2, and the probe, and the collector component will generate electric field, and the ion will generate electric current, and the probe will generate the collector component.

When the velocity component of the moving ions perpendicular to the direction of the axial magnetic field is too large, the axial magnetic field cannot restrict the moving ions to perform spiral motion, in one case, the axial magnetic field cannot introduce the ions with large velocity components into the collimator 2, in the other case, even when the ions are introduced into the inlet of the collimator 2, because the velocity components are large, the convolution radius of the ions is larger, when the convolution radius is larger than the inner diameter of the collimator 2, the ions must collide with the collimator 2, and the filtering characteristic of the axial magnetic field on the ions with different vertical velocity components is embodied.

Example 2

As shown in fig. 2 to 6, on the basis of embodiment 1, the magnetic shoe structure includes a front magnetic shoe 7 and a rear magnetic shoe 8, the front magnetic shoe 7 and the rear magnetic shoe 8 both have a fitting hole 6, the rear magnetic shoe 8 is fixedly connected with the probe housing 1 in a detachable manner, the rear end of the collimator tube 2 is fixedly connected with the rear magnetic shoe 8 in a detachable manner, the front end of the collimator tube 2 is fixedly connected with the front magnetic shoe 7 in a detachable manner, the front magnetic shoe 7 is tightly attached to the rear magnetic shoe 8 to define a space for accommodating the collimator tube 2 and the metal coil 4, and detachable fixed connection modes are adopted among the components, so that the installation and subsequent detachment operations are facilitated, and the replacement of the components is facilitated. Further, 8 rear ends of back magnetic shoes have connection boss 11, probe casing 1 has mounting hole 12, connection boss 11 passes through threaded connection's mode fixed mounting in mounting hole 12, back magnetic shoes 8 has

first mounting groove

13, 2 rear ends of collimator pipe pass through threaded connection's mode fixed mounting in first mounting groove 13, preceding magnetic shoes 7 have

second mounting groove

14, 2 front ends of collimator pipe pass through threaded connection's mode fixed mounting in second mounting groove 14, so set up, make the connection between each spare part fixed more reasonable, reliable, the mode that threaded connection is fixed further makes the installation between each part, the dismantlement process is convenient and fast more, and the operation efficiency is improved.

Example 3

As shown in fig. 2 to 4, in example 2, the front magnetic shoe 7 has a cylindrical body 9 extending from the front end to the rear end, the rear end face of the cylindrical body 9 abuts against the rear magnetic shoe 8, the cylindrical body 9 has a receiving groove 10 therein, and the receiving groove 10 is used for receiving the metal coil 4; the accommodating groove 10 provides a reliable arrangement space for the metal coil 4, and the whole structure is more compact and reasonable.

Example 4

On the basis of the embodiment 3, the cylinder 9 is connected with a power supply, and the power supply can apply positive high voltage to the cylinder 9; under certain conditions, the ion energy in the beam is too high, and the general coil magnetic field can not restrain the ion energy, so the method of applying positive high voltage can reduce the ion energy of the beam, and the ion energy can be restrained by the coil magnetic field under certain conditions, so that the aim of guiding the beam through the axial magnetic field is fulfilled.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.

Claims

1. An ExB probe capable of guiding a beam current, comprising: the probe comprises a probe shell (1), wherein a collimator (2), an electric field generating component, a magnetic field generating component and a collector component (3) are installed on the probe shell (1), a metal coil (4) is wound and installed outside the collimator (2), the metal coil (4) is connected with a power supply, an axial magnetic field can be formed in an inlet end of the collimator (2) and a through hole (5) after the metal coil (4) is electrified, the axial magnetic field cannot decelerate or accelerate charged particles, and only the direction of the charged particles can be changed;

when the beam current is in front of the inlet of the collimator (2), the beam current is constrained by an axial magnetic field emitted from the collimator (2) in advance, ions are guided to spirally advance and enter the collimator (2), and the axial magnetic field continues to constrain the ions and spirally advance;

the collimator (2) is fixedly arranged at the front end of the probe shell (1), the electric field generating component and the magnetic field generating component are both arranged in the probe shell (1), the electric field generating component forms an electric field in the probe shell (1), the magnetic field generating component forms a magnetic field in the magnetic field, and the collector component (3) is fixedly arranged at the rear end of the probe shell (1).

2. The ExB probe capable of guiding beam current as claimed in claim 1, wherein: the outside cover of collimator (2) is installed the magnetic shoe structure, the magnetic shoe structure comprises high magnetic conductive material, the front end and the rear end of magnetic shoe structure all have mating holes (6), mating holes (6) axial alignment through-hole (5) of collimator (2), mating holes (6) aperture is not less than through-hole (5) aperture.

3. The ExB probe capable of guiding beam current as claimed in claim 2, wherein: the magnetic shoe structure comprises a front magnetic shoe (7) and a rear magnetic shoe (8), the rear magnetic shoe (8) is fixedly connected with the probe shell (1) in a detachable mode, the rear end of the collimator tube (2) is fixedly connected with the rear magnetic shoe (8) in a detachable mode, the front end of the collimator tube (2) is fixedly connected with the front magnetic shoe (7) in a detachable mode, and the front magnetic shoe (7) is tightly attached to the rear magnetic shoe (8) to limit the space for containing the collimator tube (2) and the metal coil (4).

4. The ExB probe capable of guiding beam current as claimed in claim 3, wherein: the front magnetic shoe (7) is provided with a cylinder body (9) extending from the front end to the rear end, the rear end face of the cylinder body (9) is attached to the rear magnetic shoe (8), and a containing groove (10) is formed in the cylinder body (9), and the containing groove (10) is used for containing the metal coil (4).

5. The ExB probe capable of guiding beam current as claimed in claim 4, wherein: the barrel (9) is connected with a power supply, and the power supply can apply positive high voltage to the barrel (9).

6. The ExB probe capable of guiding beam current according to any one of claims 3 to 5, wherein: the rear end of the rear magnetic shoe (8) is provided with a connecting boss (11), the probe shell (1) is provided with a mounting hole (12), and the connecting boss (11) is fixedly mounted in the mounting hole (12).

7. The ExB probe capable of guiding beam current according to claim 6, wherein: back magnetic shoe (8) have first mounting groove (13), collimator (2) rear end fixed mounting be in first mounting groove (13), preceding magnetic shoe (7) have second mounting groove (14), collimator (2) front end fixed mounting be in second mounting groove (14).

8. The ExB probe capable of guiding beam current as claimed in claim 7, wherein: the connecting boss (11) is fixedly connected with the mounting hole (12) through threads, the rear end of the collimator tube (2) is fixedly connected with the first mounting groove (13) through threads, and the front end of the collimator tube (2) is fixedly connected with the second mounting groove (14) through threads.