Bidirectional magnetic field loss fast ion detector for magnetic confinement fusion device

Abstract

The invention relates to a bidirectional magnetic field loss fast ion detector for a magnetic confinement fusion device, which comprises a clockwise collimator, an anticlockwise collimator, a scintillator sheet, a detector main body, a graphite shell and a light path connecting sheet, and is characterized in that the clockwise collimator and the anticlockwise collimator are symmetrically arranged at two sides of the detector main body, the scintillator sheet is arranged in the detector main body, and the graphite shell is arranged in the detector main body. The graphite shell is arranged outside the detector body in a sleeving mode, the clockwise collimator and the anticlockwise collimator each comprise a collimator front portion and a collimator rear portion, a fixing groove is formed in the collimator rear portion, a collimator rear hole is formed in the fixing groove in a penetrating mode, the collimator front portion is detachably installed in the fixing groove, and the collimator rear hole is detachably installed in the fixing groove. A cavity communicated with the fixing groove is formed in the collimator front portion, a collimator front hole is formed in the cavity in a penetrating mode, one end of the light path connecting piece is connected with the detector body, and the other end of the light path connecting piece is connected with the rear-end light path pipeline. The device can adapt to a bidirectional annular magnetic field, the upgrading cost is reduced through the modular design, and stable installation can be provided for the scintillator.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic confinement fusion plasma diagnostics, and particularly relates to a bidirectional magnetic field loss fast ion detector for a magnetic confinement fusion device. Background Art

[0002] A scintillator-based fast ion loss probe is a probe used in magnetic confinement fusion plasma experimental devices to detect high-energy ions lost from the plasma. Its probe head mainly includes a collimator and a scintillator sheet. When the unconfined high-energy ions escape to the plasma edge, they are first screened by the collimator. The ions passing through the collimator perform Larmor gyration under the strong magnetic field of the magnetic confinement device and finally hit a certain position on the scintillator sheet, emitting fluorescence. Since ions with different energies and pitch angles hit different positions, experimental personnel can read out the energy and pitch angle of the lost ions according to the position where the fluorescence is emitted on the scintillator sheet, and then invert the motion trajectory of the lost ions to help study the loss mechanism of high-energy ions.

[0003] For the design of the loss fast ion detector, the common practice on current major magnetic confinement fusion devices is to use a set of collimators and a scintillator sheet. The collimator includes two parts, namely two slits. The orbit of the lost fast ions will hit a certain area on the scintillator after being collimated by the two slits of the collimator. The problems existing in the current loss fast ion detector are as follows:

[0004] 1. It can only work under the toroidal magnetic field in a specific direction. The force on a charged particle in a magnetic field satisfies the left-hand rule, and the reverse of the magnetic field direction will cause the reversal of the Larmor gyration direction of the charged particle. When the toroidal magnetic field in the magnetic confinement fusion device is in the direction designed for the detector, the Larmor gyration of the lost fast ions can pass through the collimator in the detector and hit the scintillator. However, when the toroidal magnetic field is reversed, the Larmor gyration direction of the lost fast ions is reversed, and after passing through the collimator, it will rotate in the opposite direction of the scintillator, so it cannot reach the scintillator, resulting in the lost fast ions not being detectable;

[0005] 2. It is difficult to upgrade and transform the detector structure. In the traditional detector design, most components are processed integrally, with high processing costs. And when the experimental conditions change, it is difficult to upgrade and transform by replacing components, and only the whole can be replaced;

[0006] 3. It is difficult to install the scintillator sheet. There is no reserved installation position for the scintillator sheet in the traditional detector design. Generally, the edge of the scintillator sheet is fixed by screws or other components, resulting in insecure installation of the scintillator sheet. It is easy to fall off during the experiment, and the local pressure is likely to cause deformation of the scintillator sheet, seriously affecting the accuracy of experimental data.

[0007] Therefore, a bidirectional magnetic field loss fast ion detector for a magnetic confinement fusion device is proposed to solve the problems of strong dependence of existing detectors on the magnetic field direction, difficult structural upgrade, and unstable installation of scintillators. Summary of the Invention

[0008] To solve the problems in the background art, the present invention proposes a bidirectional magnetic field loss fast ion detector for a magnetic confinement fusion device. The present invention can adapt to bidirectional toroidal magnetic fields, modular design reduces upgrade costs, and can provide a stable installation for scintillators.

[0009] To solve the above problems, the present invention adopts the following technical solution: A bidirectional magnetic field loss fast ion detector for a magnetic confinement fusion device includes a scintillator sheet, a clockwise collimator, a counterclockwise collimator, a detector body, a graphite housing, and an optical path connection piece. The clockwise collimator and the counterclockwise collimator are symmetrically arranged on both sides of the scintillator sheet. The clockwise collimator includes a clockwise collimator front part and a clockwise collimator rear part. A clockwise collimator fixing groove is formed on the wall of the clockwise collimator rear part, and a clockwise collimator rear hole is formed through the wall of the clockwise collimator fixing groove. The clockwise collimator front part is detachably installed in the clockwise collimator fixing groove. A clockwise collimator cavity communicating with the clockwise collimator fixing groove is formed on the wall of the clockwise collimator front part, and a clockwise collimator front hole is formed through the wall of the clockwise collimator cavity. The clockwise collimator front hole, the clockwise collimator cavity, and the clockwise collimator rear hole are used to form a channel for loss fast ions in the plasma region to strike the scintillator sheet. In this embodiment, the counterclockwise collimator is arranged in the same way as the clockwise collimator, but in actual experiments, the two collimators can also be differentially set according to experimental requirements. The bidirectional collimator system and the scintillator sheet are both fixed on the detector body, and the graphite housing is sleeved outside the detector body; one end of the optical path connection piece is connected to the detector body, and the other end is used to connect the rear optical path pipeline.

[0010] In the present invention, by respectively arranging two sets of collimator structures of a clockwise collimator and a counterclockwise collimator on both sides of the detector body, when the toroidal magnetic field direction of the magnetic confinement fusion device is the design direction of the clockwise collimator, the lost fast ions perform Larmor gyration and pass through the clockwise collimator and strike on the scintillator sheet. At this time, the clockwise collimator is in an effective state. The rotation direction of the lost fast ions passing through the counterclockwise collimator on the other side of the detector is in the opposite direction to the scintillator sheet. Therefore, the counterclockwise collimator will not generate experimental signals and is in an ineffective state; when the toroidal magnetic field direction of the magnetic confinement fusion device is reversed, the Larmor gyration direction of the lost fast ions is reversed. At this time, some of the lost fast ions can still pass through the clockwise collimator, but due to the reverse gyration motion, they move in the opposite direction to the scintillator sheet after passing through the clockwise collimator. Therefore, they will not strike the scintillator sheet to generate experimental signals, and the clockwise collimator fails. At this time, at the counterclockwise collimator on the other side of the detector, due to the reverse gyration motion of the lost fast ions, their rotation direction after passing through the counterclockwise collimator is exactly the direction of the scintillator sheet. Therefore, they can strike on the scintillator sheet to generate experimental signals. Therefore, the counterclockwise collimator is in an effective state. Thus, the two-way magnetic field lost fast ion detector proposed by the present invention can realize automatic adjustment and adaptation to the toroidal magnetic field direction of the magnetic confinement fusion device.

[0011] Further, the two-way collimator system further includes a detector body for fixedly installing the scintillator sheet. Two opposite side surfaces of the detector body are respectively detachably connected to the rear part of the clockwise collimator and the rear part of the counterclockwise collimator. The side surface of the scintillator sheet is coated with a scintillator coating. In the present invention, by arranging the detector body, an installation basis is provided for the scintillator sheet.

[0012] Further, a graphite outer shell is sleeved outside the detector body. In the present invention, by sleeving a graphite outer shell outside the detector, other metal components of the device can be prevented from being exposed to the vacuum environment of the magnetic confinement fusion device, thereby reducing the metal element impurities entering the plasma region and avoiding affecting the experiment.

[0013] Furthermore, a slot is provided through the interior of the detector body, and the two ends of the slot are respectively in contact with the rear of the clockwise collimator and the rear of the counterclockwise collimator, and the size of the slot matches the size of the scintillator sheet, and the scintillator sheet is snap-fitted into the slot. In the present invention, the scintillator sheet is snap-fitted into the slot by providing a slot in the detector body, and the size of the scintillator sheet is matched with the size of the slot, so that the side of the scintillator sheet and the edge of the slot are located on the same plane, and when the rear of the clockwise collimator and the rear of the counterclockwise collimator are assembled to the two sides of the detector body, the two rear collimators can just abut against the two sides of the scintillator sheet, so that the scintillator sheet can be completely fixed to avoid falling off, and the two sides of the scintillator sheet will not extend out of the slot to avoid affecting the assembly accuracy.

[0014] Furthermore, the graphite shell includes a shell body and a frame, the detector body and the rear part of the clockwise collimator and the rear part of the counterclockwise collimator are installed in the shell body, the front hole of the clockwise collimator and the front hole of the counterclockwise collimator are both extended out of the shell body, the frame is sealed and arranged on the side of the shell body, and the optical path connecting piece is detachably connected to the outer end of the detector body and contacts and cooperates with the side of the frame. In the present invention, by setting the graphite shell as two parts, namely the shell body and the frame, it is possible to facilitate the assembly and connection of the detector body, the clockwise collimator and the counterclockwise collimator with the graphite shell.

[0015] Furthermore, mounting openings are provided on two opposite sides of the shell body, and the two mounting openings are symmetrically arranged, and the front part of the clockwise collimator and the front part of the counterclockwise collimator are passed through the two mounting openings of the shell body in a one-to-one correspondence.

[0016] Furthermore, the clockwise collimator and the counterclockwise collimator are configured with a variety of specifications, and the distances from the front hole and the rear hole of the clockwise collimator of different specifications to the scintillator sheet in the y-axis direction are different, and the distances from the front hole and the rear hole of the counterclockwise collimator of different specifications to the scintillator sheet in the y-axis direction are also different. In the present invention, when the experimental conditions change, such as when the annular magnetic field strength of the magnetic confinement fusion device is enhanced, it is necessary to increase the distances from the front hole of the collimator and the rear hole of the collimator to the scintillator sheet in the y-axis direction. Since the present invention is configured with a variety of specifications of clockwise collimators and counterclockwise collimators, it is only necessary to replace the corresponding clockwise collimators and counterclockwise collimators, and other components of the detector do not need to be reprocessed, thereby improving the upgrade and replacement efficiency of the detector and reducing the upgrade and replacement cost.

[0017] Furthermore, a base made of metal is provided at the bottom of the scintillator sheet. In the present invention, a base made of metal is selected to ensure the mechanical strength of the base.

[0018] Advantages of the present invention: The present invention adopts the layout design of a clockwise collimator and a counterclockwise collimator. When the toroidal magnetic field direction is clockwise, the lost fast ions hit the scintillator plate through the clockwise collimator, and the counterclockwise collimator automatically fails due to the reverse ion cyclotron direction. When the magnetic field direction is switched to counterclockwise, the counterclockwise collimator becomes effective, ensuring that the ions continuously hit the scintillator plate, completely solving the problem of signal loss caused by the single dependence on the magnetic field direction in traditional detectors. Compared with the prior art that only supports a single magnetic field direction, the present invention can cover the two-way magnetic field conditions, significantly expanding the applicable scenarios of the detector. The present invention adopts a modular design, and each key component in the detector can be detachably connected. Therefore, when the experimental conditions change, the detector can be upgraded by replacing the corresponding components of the detector, avoiding reprocessing the detector and greatly reducing the time cost and processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the drawings and embodiments.

[0020] Figure 1 Front view of the schematic diagram of the two-way magnetic field lost fast ion detector of the present invention;

[0021] Figure 2 Right view of the schematic diagram of the two-way magnetic field lost fast ion detector of the present invention;

[0022] Figure 3 Simulation diagram of the working condition of the traditional single-way magnetic field lost fast ion detector;

[0023] Figure 4 Simulation diagram of the working condition of the two-way magnetic field lost fast ion detector of the present invention;

[0024] Figure 5 Front view of the two-way magnetic field lost fast ion detector of the present invention;

[0025] Figure 6 Side view of the two-way magnetic field lost fast ion detector of the present invention;

[0026] Figure 7 Schematic three-dimensional structure diagram of the two-way magnetic field lost fast ion detector of the present invention;

[0027] Figure 8 Explosion diagram of the two-way magnetic field lost fast ion detector of the present invention;

[0028] Figure 9 Front structure schematic diagram of the clockwise collimator of the present invention;

[0029] Figure 10 Rear structure schematic diagram of the clockwise collimator of the present invention;

[0030] Figure 11 Structural schematic diagram of the detector main body of the present invention;

[0031] Figure 12 Structural schematic diagram of the scintillator sheet of the present invention;

[0032] Figure 13 Top view of the installation cross-sectional view of the two-way magnetic field loss fast ion detector of the present invention;

[0033] Figure 14 Front view of the installation cross-sectional view of the two-way magnetic field loss fast ion detector of the present invention.

[0034] 1. Scintillator sheet; 1.1 Scintillator coating; 2. Clockwise collimator; 2.1 Front hole of the clockwise collimator; 2.2 Rear hole of the clockwise collimator; 2.3 Front part of the clockwise collimator; 2.4 Rear part of the clockwise collimator; 2.5 Cavity of the clockwise collimator; 2.6 Fixing groove of the clockwise collimator; 3.1 Front hole of the counterclockwise collimator; 3.2 Rear hole of the counterclockwise collimator; 3.3 Front part of the counterclockwise collimator; 3.4 Rear part of the counterclockwise collimator; 3.5 Fixing groove of the counterclockwise collimator; 3.6 Cavity of the counterclockwise collimator; 4. Detector main body; 4.1 Card slot; 5. Graphite shell; 6. Optical path connecting piece; 7. Rear-end optical path pipeline; 8. Clockwise detection track; 9. Counterclockwise detection track; 10. Magnetic confinement fusion device; 11. Plasma region. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] Such as Figures 5 to 14As shown in the figure, a bidirectional magnetic field loss fast ion detector for a magnetic confinement fusion device includes a scintillator sheet 1, a clockwise collimator 2, a counterclockwise collimator 3, a detector body 4, a graphite housing 5, and an optical path connecting sheet 6. The clockwise collimator 2 and the counterclockwise collimator 3 are symmetrically arranged on both sides of the scintillator sheet 1. The clockwise collimator 2 includes a clockwise collimator front part 2.3 and a clockwise collimator rear part 2.4. A clockwise collimator fixing groove 2.6 is formed on the clockwise collimator rear part 2.4. A clockwise collimator rear hole 2.2 is formed through the wall of the clockwise collimator fixing groove 2.6. The clockwise collimator front part 2.3 is detachably installed in the clockwise collimator fixing groove 2.6. A clockwise collimator cavity 2.5 communicating with the clockwise collimator fixing groove 2.6 is formed on the clockwise collimator front part 2.3. A clockwise collimator front hole 2.1 is formed through the wall of the clockwise collimator cavity 2.5. The clockwise collimator front hole 2.1, the clockwise collimator cavity 2.5, and the clockwise collimator rear hole 2.2 are used to form a channel for fast ions lost in the plasma region to strike the scintillator sheet 1. In this embodiment, the counterclockwise collimator 3 is arranged in the same way as the clockwise collimator 2. However, in actual experiments, the two collimators can also be set differently according to experimental requirements. The bidirectional collimator system and the scintillator sheet 1 are both fixed on the detector body 4. The graphite housing 5 is sleeved outside the detector body 4. One end of the optical path connecting sheet 6 is connected to the detector body 4, and the other end is used to connect the rear-end optical path pipeline 7.

[0037] In the present invention, by respectively arranging two sets of collimator structures of a clockwise collimator 2 and a counterclockwise collimator 3 on both sides of the detector body 4, when the toroidal magnetic field direction of the magnetic confinement fusion device 10 is the design direction of the clockwise collimator 2, the lost fast ions perform Larmor gyration and pass through the clockwise collimator 2 and strike on the scintillator sheet 1. At this time, the clockwise collimator 2 is in an effective state. The rotation direction of the lost fast ions passing through the counterclockwise collimator 3 on the other side of the detector is opposite to that of the scintillator sheet 1. Therefore, the counterclockwise collimator 3 does not generate experimental signals and is in an ineffective state. When the toroidal magnetic field direction of the magnetic confinement fusion device 10 is reversed, the Larmor gyration direction of the lost fast ions is reversed. At this time, some of the lost fast ions can still pass through the clockwise collimator 2, but due to the reverse gyration motion, they move in the opposite direction of the scintillator sheet 1 after passing through the clockwise collimator 2. Therefore, they will not strike the scintillator sheet 1 to generate experimental signals, and the clockwise collimator 2 fails. At this time, at the counterclockwise collimator 3 on the other side of the detector, due to the reverse gyration motion of the lost fast ions, their rotation direction after passing through the counterclockwise collimator 3 is exactly the direction of the scintillator sheet 1. Therefore, they can strike on the scintillator sheet 1 to generate experimental signals. Therefore, the counterclockwise collimator 3 becomes effective. Thus, the bidirectional magnetic field lost fast ion detector proposed by the present invention can realize automatic adjustment and adaptation to the toroidal magnetic field direction of the magnetic confinement fusion device 10.

[0038] Furthermore, the bidirectional collimator system further includes a detector body 4 for fixedly mounting the scintillator sheet 1. Two opposite side surfaces of the detector body 4 are respectively detachably connected to the rear part 2.4 of the clockwise collimator and the rear part 3.4 of the counterclockwise collimator. The side surface of the scintillator sheet 1 is coated with a scintillator coating 1.1. In the present invention, by providing the detector body 4, an installation basis is provided for the scintillator sheet 1.

[0039] Furthermore, a graphite outer shell 5 is sleeved outside the detector body 4. In the present invention, by sleeving the graphite outer shell 5 outside the detector, other metal components of the device can be prevented from being exposed to the vacuum environment of the magnetic confinement fusion device 10, thereby reducing the metal element impurities entering the plasma region 11 and avoiding the influence on the experiment.

[0040] Furthermore, a slot 4.1 is provided inside the detector body 4, and the two ends of the slot 4.1 are respectively in contact with the clockwise collimator rear portion 2.4 and the counterclockwise collimator rear portion 3.4, and the size of the slot 4.1 matches the size of the scintillator sheet 1, and the scintillator sheet 1 is snap-fitted into the slot 4.1. In the present invention, the scintillator sheet 1 is snap-fitted and fixed by providing the slot 4.1 in the detector body 4, and the size of the scintillator sheet 1 is matched with the size of the slot 4.1, so that the side of the scintillator sheet 1 and the edge of the slot 4.1 are located on the same plane, and when the clockwise collimator rear portion 2.4 and the counterclockwise collimator rear portion 3.4 are assembled to the two sides of the detector body 4, the two collimator rear portions can just abut against the two sides of the scintillator sheet 1, so that the scintillator sheet 1 can be completely fixed to avoid falling off, and the two sides of the scintillator sheet 1 will not extend out of the slot 4.1 to avoid affecting the assembly accuracy.

[0041] Further, the graphite shell 5 includes a shell body and a frame, the detector body 4 and the clockwise collimator rear part 2.4 and the counterclockwise collimator rear part 3.4 are installed in the shell body, the clockwise collimator front hole 2.1 and the counterclockwise collimator front hole 3.1 are both extended out of the shell body, the frame is sealed and arranged on the side of the shell body, and the optical path connecting piece 6 is detachably connected to the outer end of the detector body 4 and contacts and cooperates with the side of the frame. In the present invention, by setting the graphite shell 5 as two parts of the shell body and the frame, it is possible to facilitate the assembly and connection of the detector body 4, the clockwise collimator 2 and the counterclockwise collimator 3 with the graphite shell 5.

[0042] Furthermore, mounting openings are provided on two opposite sides of the shell body, and the two mounting openings are symmetrically arranged, and the clockwise collimator front part 2.3 and the counterclockwise collimator front part 3.3 are correspondingly passed through the two mounting openings of the shell body.

[0043] Further, the clockwise collimator 2 and the counterclockwise collimator 3 are configured with multiple specifications. For the clockwise collimator with different specifications, the distance from the front hole 2.1 of the clockwise collimator to the rear hole 2.2 of the clockwise collimator in the y-axis direction to the scintillator sheet 1 is different. For the counterclockwise collimator with different specifications, the distance from the front hole 3.1 of the counterclockwise collimator to the rear hole 3.2 of the counterclockwise collimator in the y-axis direction to the scintillator sheet 1 is also different. In the present invention, when the experimental conditions change, such as when the toroidal magnetic field intensity of the magnetic confinement fusion device 10 increases, it is necessary to increase the distance from the front hole of the collimator and the rear hole of the collimator to the scintillator sheet 1 in the y-axis direction. Since the present invention is configured with clockwise collimators 2 and counterclockwise collimators 3 of multiple specifications, only the corresponding clockwise collimator 2 and counterclockwise collimator 3 need to be replaced, and other components of the detector do not need to be reprocessed, thereby improving the upgrade and replacement efficiency of the detector and reducing the upgrade and replacement cost.

[0044] Further, a base made of a metal material is provided at the bottom of the scintillator sheet 1. In the present invention, a base made of a metal material is selected to ensure the mechanical strength of the base.

[0045] In this embodiment, the thickness of the base is greater than 0.5 mm. Setting the thickness of the base above 0.5 mm can effectively avoid deformation of the base when subjected to external forces, improving the reliability of the experiment.

[0046] Assembly process of the present invention: Before the experiment, the device needs to be assembled in a laboratory environment. First, the scintillator sheet 1 is installed into the card slot 4.1 of the detector body 4 with the scintillator coating 1.1 facing outward, ensuring that the lost fast ions reaching the scintillator sheet 1 can react with the scintillator coating 1.1 to emit scintillation light. Then, the front part 2.3 of the clockwise collimator is inserted into the clockwise collimator fixing slot 2.6 of the corresponding rear part 2.4 of the clockwise collimator and fixed by bolts. Thus, the relative positions of the front hole 2.1 and the rear hole 2.2 of the clockwise collimator are fixed, ensuring that the collimation effect of the clockwise collimator 2 will not be affected by the change in the relative positions of the front hole 2.1 and the rear hole 2.2 of the clockwise collimator. Then, the counterclockwise collimator 3 is installed in the same way. Then, the rear part 2.4 of the clockwise collimator and the rear part 3.4 of the counterclockwise collimator are fixed on the opposite sides of the detector body 4 by bolts. Before the installation of the two collimators is completed, the scintillator sheet 1 can slide in the card slot 4.1. After the installation of the two collimators is completed, the scintillator sheet 1 is completely fixed in the card slot 4.1 by the rear part 2.4 of the clockwise collimator and the rear part 3.4 of the counterclockwise collimator. Then, the housing body and the frame of the graphite housing 5 are respectively sleeved from both sides of the detector body 4, and then the optical path connection piece 6 is fixed on the detector body 4 by bolts. During the experiment, the rear optical path pipeline 7 can be connected through the optical path connection piece 6 to complete the transmission and acquisition of optical signals. Then, the detector is sent into the vacuum environment through the vacuum window of the magnetic confinement fusion device 10. The detector needs to be close to the plasma region 11 to facilitate receiving the lost fast ions escaping from the plasma region 11.

[0047] Working principle of the present invention: When the magnetic confinement fusion device 10 is in operation, a strong toroidal magnetic field will be generated inside it to confine the charged particles within the safe plasma region 11. During the experiment, the toroidal magnetic field may be applied in two directions. When the direction of the toroidal magnetic field is clockwise, the clockwise collimator 2 becomes effective, and the lost fast ions perform Larmor gyration and pass through the clockwise collimator 2 and strike on the scintillator sheet 1. Their movement trajectories can be referred to Figures 1 to 4The clockwise detection orbit 8 in it. At this time, the rotation direction of the lost fast ions passing through the counterclockwise collimator 3 on the other side of the detector body 4 is opposite to that of the scintillator sheet 1. Therefore, the counterclockwise collimator 3 will not generate an experimental signal and is in a failure state. When the toroidal magnetic field direction of the magnetic confinement fusion device 10 is counterclockwise, the Larmor gyration direction of the lost fast ions is reversed. At this time, some of the lost fast ions can still pass through the clockwise collimator 2. However, due to the reverse gyration motion, after passing through the collimator, they move in the opposite direction of the scintillator sheet 1. Therefore, they will not hit the scintillator sheet 1 to generate an experimental signal, and the clockwise collimator 2 fails. At this time, at the counterclockwise collimator 3 on the other side of the detector body 4, due to the reverse gyration motion of the lost fast ions, their rotation direction after passing through the counterclockwise collimator 3 is exactly the direction of the scintillator sheet 1. Therefore, they can hit the scintillator sheet 1 to generate an experimental signal, and their motion orbit can be referred to Figure 1 、 Figure 2 and Figure 4 the counterclockwise detection orbit 9 in. Thus, the bidirectional magnetic field lost fast ion detector proposed by the present invention can realize automatic adjustment and adaptation to the toroidal magnetic field direction of the magnetic confinement fusion device.

[0048] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bidirectional magnetic field loss fast ion detector for a magnetic confinement fusion device, characterized in that Comprising: A bidirectional collimator system, including a scintillator sheet (1), a clockwise collimator (2) and a counterclockwise collimator (3). The clockwise collimator (2) and the counterclockwise collimator (3) are symmetrically arranged on both sides of the scintillator sheet (1). The clockwise collimator (2) includes a clockwise collimator front part (2.3) and a clockwise collimator rear part (2.4). A clockwise collimator fixing groove (2.6) is formed on the clockwise collimator rear part (2.4). A clockwise collimator rear hole (2.2) is formed through the wall of the clockwise collimator fixing groove (2.6). The clockwise collimator front part (2.3) is detachably installed in the clockwise collimator fixing groove (2.6). A clockwise collimator cavity (2.5) communicating with the clockwise collimator fixing groove (2.6) is formed on the clockwise collimator front part (2.3). A clockwise collimator front hole (2.1) is formed through the wall of the clockwise collimator cavity (2.5). The clockwise collimator front hole (2.1), the clockwise collimator cavity (2.5) and the clockwise collimator rear hole (2.2) are used to form a channel for fast ions in the plasma region to strike the scintillator sheet (1). The counterclockwise collimator (3) has the same structure and installation method as the clockwise collimator (2). One end of the optical path connecting piece (6) is connected to the bidirectional collimator system, and the other end is used to connect the rear optical path pipeline (7).

2. The two-way magnetic field loss fast ion detector for a magnetic confinement fusion device according to claim 1, characterized in that: The bidirectional collimator system further includes a detector main body (4) for fixedly installing the scintillator sheet (1). Two opposite side surfaces of the detector main body (4) are detachably connected to the clockwise collimator rear part (2.4) and the counterclockwise collimator rear part (3.4) of the counterclockwise collimator (3) respectively. A scintillator coating (1.1) is provided on the side surface of the scintillator sheet (1).

3. The bidirectional magnetic field loss fast ion detector for a magnetic confinement fusion device according to claim 2, wherein: A graphite outer shell (5) is sleeved outside the detector main body (4).

4. The two-way magnetic field loss fast ion detector for a magnetic confinement fusion device according to claim 3, characterized in that: A card slot (4.1) is formed through the inside of the detector main body (4). Two ends of the card slot (4.1) are in contact and cooperation with the clockwise collimator rear part (2.4) and the counterclockwise collimator rear part (3.4) respectively. And the size of the card slot (4.1) matches the size of the scintillator sheet (1). The scintillator sheet (1) is in snap-fit connection with the card slot (4.1).

5. A low-shadow wide-angle loss fast ion detector for a magnetic confinement fusion device according to claim 3, characterized in that: The graphite outer shell (5) includes a shell main body and a frame. The detector main body (4), the clockwise collimator rear part (2.4) and the counterclockwise collimator rear part (3.4) are installed inside the shell main body. The clockwise collimator front hole (2.1) and the counterclockwise collimator front hole (3.1) of the counterclockwise collimator (3) both extend outside the shell main body. The frame is hermetically arranged on the side surface of the shell main body. The optical path connecting piece (6) is detachably connected to the outer end of the detector main body (4) and is in contact and cooperation with the side surface of the frame.

6. The fast ion detector with low shadow and wide angle loss for a magnetic confinement fusion device according to claim 5, characterized in that: Installation ports are provided on two opposite sides of the housing body, and the two installation ports are symmetrically arranged. The front part (2.3) of the clockwise collimator and the front part (3.3) of the counterclockwise collimator (3) of the counterclockwise collimator penetrate out of the two installation ports of the housing body in a one-to-one correspondence.

7. A fast ion detector with low shadow and wide angle loss for a magnetic confinement fusion device according to any one of claims 1 to 6, characterized in that: The clockwise collimator (2) and the counterclockwise collimator (3) are configured in multiple specifications. The distances from the front hole (2.1) and the rear hole (2.2) of the clockwise collimator of different specifications to the scintillator sheet (1) in the y-axis direction are different, and the distances from the front hole (3.1) and the rear hole (3.2) of the counterclockwise collimator of different specifications of the counterclockwise collimator (3) to the scintillator sheet (1) in the y-axis direction are also different.

8. A fast ion detector with low shadow and wide angle loss for a magnetic confinement fusion device according to any one of claims 1 to 6, characterized in that: A base made of a metal material is provided at the bottom of the scintillator sheet (1).

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