Low-shadow wide-angle-loss fast ion detector for magnetic confinement fusion device

Abstract

The invention relates to a low-shadow wide-angle-loss fast ion detector for a magnetic confinement fusion device, which comprises a double-collimator system and a light path connecting tube, the double-collimator system comprises a collimator front part, a collimator rear part and a scintillator sheet, the collimator front part is provided with a forward collimation front hole and a reverse collimation front hole, and the collimator rear part is provided with a reverse collimation front hole; a forward collimation rear hole and a reverse collimation rear hole are formed in the collimator rear portion, the scintillator sheets are arranged on the side faces of the forward collimator and the reverse collimator, and the length of the forward collimation rear hole and the length of the reverse collimation rear hole and the distance between the forward collimator and the reverse collimator in the y-axis direction are calculated and determined through a detector simulation program. Overlapping of detection areas can be avoided; one end of the light path connecting pipe is fixedly arranged on the double-collimation system, and the other end of the light path connecting pipe is provided with external threads and used for being in threaded connection with a rear-end light path pipeline. According to the method, the track shadow can be reduced under the condition that the wide throwing angle detection range is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic confinement fusion plasma diagnostics, and in particular to a low-shadow wide-angle loss fast ion detector for a magnetic confinement fusion device. Background Art

[0002] A loss fast ion detector is a detector used to detect high-energy ions lost from a plasma in a magnetic confinement fusion plasma experimental device, mainly including two main parts: 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 make Larmor gyration motions under the strong magnetic field of the magnetic confinement device and finally hit a certain position on the scintillator sheet to emit 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] As Figure 1 shown, the greater the energy, that is, the greater the gyration radius of the loss fast ion, the greater the x coordinate position where it will fall on the scintillator. The angle between the velocity vector of the loss fast ion and the magnetic field vector at its position is defined as the pitch angle of the loss fast ion. If the projection of the velocity vector of the loss fast ion in the direction of the magnetic field vector is the same as the direction of the magnetic field vector, that is, the pitch angle is less than 90°, then the loss fast ion is called a forward-moving particle, otherwise it is a backward-moving particle. As Figure 2 shown, the figure includes a traditional collimator front hole 15 and a traditional collimator rear hole 16. Loss fast ions with different pitch angles will fall on different y coordinate positions on the scintillator. In order to achieve a larger pitch angle detection range, traditional wide-angle loss fast ion detectors generally use a longer collimator rear hole, and there are mainly the following problems:

[0004] 1. The problem of orbital shadow is serious. As Figure 3 and Figure 4 shown, ions with a pitch angle close to 90° are easily blocked by the collimator or the detector structure due to the highly compressed spiral orbit, forming the Figure 4 gray orbital shadow area in. Under the traditional design, if such ions are not blocked, they will fall in the middle position of the scintillator, but their actual orbits are blocked by the detector body, resulting in the ions in this pitch angle range not being effectively detected, seriously limiting the detection angle range.

[0005] 2. Overlap of the detection regions of the double collimators. Fast ions with specific energy and pitch angle will strike a specific position on the scintillator after passing through a single set of collimators. If the impact positions of all fast ions with lost energy and pitch angle on the scintillator after passing through this collimator are statistically analyzed, a region can be obtained, that is, the region that can be affected by this collimator. Each coordinate in the region corresponds to ions with a certain energy and pitch angle. Therefore, this region is called the detection region of this collimator. If two sets of collimators are simply used, the detection regions delimited by the two sets of collimators on the scintillator plate may partially overlap, and the bright spots in the overlapping region cannot be clearly attributed, resulting in the failure of energy and pitch angle calculations and affecting the accuracy of data inversion.

[0006] 3. The installation angle of the detector is not adjustable. When the magnetic field vector, as Figure 4 shown, is parallel to the long side of the scintillator, the detection efficiency of the detector for fast ions is the highest. When the traditional detector is installed on the rear optical path pipeline, it is often fixed by bolt connection. Therefore, it is difficult to adjust the detector angle according to the actual situation during installation, which affects the actual detection efficiency. Summary of the Invention

[0007] To solve the problems in the background technology, the present invention proposes a low-shadow wide-angle lost fast ion detector for a magnetic confinement fusion device. The present invention can reduce the orbit shadow while ensuring a wide pitch angle detection range.

[0008] To solve the above problems, the present invention adopts the following technical solution: A low-shadow wide-angle lost fast ion detector for a magnetic confinement fusion device, comprising a double collimator system, a scintillator plate, a detector main body structure, a graphite housing, and an optical path connecting pipe. The double collimator system includes a front collimator, a rear collimator, and a scintillator plate. A forward collimation front hole and a reverse collimation front hole are opened on the front collimator. A forward collimation rear hole and a reverse collimation rear hole are opened on the rear collimator. The forward collimation front hole and the forward collimation rear hole form the hole channel of the forward collimator. The reverse collimation front hole and the reverse collimation rear hole form the hole channel of the reverse collimator. The scintillator plate is arranged on the sides of the forward collimator and the reverse collimator. The double collimator system and the scintillator plate are both fixed on the detector main body structure. A graphite housing is sleeved outside the detector main body structure. One end of the optical path connecting pipe is fixedly arranged on the detector main body structure, and the other end of the optical path connecting pipe is provided with an external thread and is used for threaded connection with the rear optical path pipeline.

[0009] In the present invention, by adopting the layout of two sets of collimators, with the forward collimator and the reverse collimator respectively arranged on both sides of the scintillator sheet, compared with the traditional centered design of a single collimator, this layout enables the landing points of fast ions with a throw angle close to 90° to be dispersed on the two side edges of the scintillator sheet rather than in the middle area, significantly reducing the occlusion of the helical orbits of high-throw-angle ions; by setting the sizes of the forward collimator and the reverse collimator and the lengths of the forward collimated holes and the reverse collimated holes, the overlap between the detection areas of the forward collimator and the reverse collimator can be effectively reduced to solve the problem of detection failure caused by the overlap of the detection areas; the optical path connecting pipe is threadedly connected to the rear optical path pipeline, which can not only ensure the installation stability of the optical path connecting pipe, but also freely adjust the spin angle of the detector body around the axis during the process of screwing the optical path connecting pipe into the rear optical path pipeline, thereby completing the transmission and acquisition of optical signals.

[0010] Further, the rear side of the front part of the collimator is open and forms a cavity, a boss is provided on the front side of the rear part of the collimator, the shape and size of the boss match those of the cavity, the front part of the collimator and the rear part of the collimator are connected by bolts, and both the forward collimated hole and the reverse collimated hole are penetrated and arranged on the boss. In the present invention, since the cavity of the front part of the collimator matches the shape and size of the boss of the rear part of the collimator, the front part and the rear part of the collimator can be closely combined to prevent installation errors. The forward collimating front hole and the reverse collimating front hole are arranged on the front part of the collimator, the forward collimated hole and the reverse collimated hole are arranged on the rear part of the collimator, and the front part and the rear part of the collimator are fixed by bolts so that the relative positions of the forward collimating front hole, the forward collimated hole, the reverse collimating front hole and the reverse collimated hole are fixed, ensuring that the collimation effect of the collimator will not be affected by the change of the relative positions of the hole positions.

[0011] Further, the double collimator system further includes a detector body for fixedly mounting the scintillator sheet, the side surface of the detector body is connected to the rear part of the collimator by bolts, and a scintillator coating is applied on one surface of the scintillator sheet. In the present invention, by setting the detector body, a mounting 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 the influence on the experiment.

[0013] Furthermore, the graphite housing includes a housing body and an upper cover, the top surface of the housing body and a side close to the collimator are both open, the detector body and the back plate are fixed in the housing body, the side opening side of the housing body is detachably connected to the side of the collimator, and the upper cover is arranged on the top of the housing body and is detachably connected to the top surface of the detector body. In the present invention, by setting the graphite housing as two parts, the housing body and the upper cover, it is possible to facilitate the assembly and connection of the detector body, the back plate and the collimator with the graphite housing.

[0014] Furthermore, a slot is provided through the inside of the detector body, and a back plate is installed on the side of the detector body away from the rear of the collimator. One end of the slot contacts and cooperates with the side of the rear of the collimator, and the other end contacts and cooperates with the side of the back plate. 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. At the same time, 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. When the back plate and the rear of the collimator are assembled to the two sides of the detector body, the back plate and the rear of the collimator 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.

[0015] 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.

[0016] Beneficial effects of the present invention: The present invention adopts a layout of two sets of collimators, and the forward collimator and the reverse collimator are respectively arranged on both sides of the scintillator sheet. Compared with the traditional single collimator centered design, this layout makes the loss fast ion landing points with a pitch angle close to 90° dispersed on the two side edges of the scintillator sheet rather than the middle area, which significantly reduces the obstruction of the ion spiral orbit with a pitch angle close to 90°; through the corresponding developed detector simulation program calculation, the length of the forward collimation back hole and the reverse collimation back hole, and the distance between the two back holes on the y-axis can be reasonably set, thereby effectively reducing the overlap of the detection area of the forward collimator and the detection area of the reverse collimator, so as to solve the problem of detection failure caused by the overlap of the detection area; the optical path connecting tube is threadedly connected to the rear-end optical path pipeline, which not only ensures the installation stability of the optical path connecting tube, but also in the process of screwing the optical path connecting tube into the rear-end optical path pipeline, the axial spin angle of the detector body can be freely adjusted according to the experimental conditions, thereby completing the transmission and collection of optical signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 Is the front view of the principle of a traditional wide-angle loss fast ion detector;

[0019] Figure 2 Is the top view of the principle of a traditional wide-angle loss fast ion detector;

[0020] Figure 3 Is the detection orbit diagram of a traditional wide-angle loss fast ion detector;

[0021] Figure 4 Is the orbit shadow diagram of a traditional wide-angle loss fast ion detector;

[0022] Figure 5 Is the top view of the principle of the low-shadow wide-angle loss fast ion detector of the present invention;

[0023] Figure 6 Is the detection orbit diagram of the low-shadow wide-angle loss fast ion detector of the present invention;

[0024] Figure 7 Is the orbit shadow diagram of the low-shadow wide-angle loss fast ion detector of the present invention;

[0025] Figure 8 Is the front view of the low-shadow wide-angle loss fast ion detector of the present invention;

[0026] Figure 9 Is the three-dimensional structure schematic diagram of the low-shadow wide-angle loss fast ion detector of the present invention;

[0027] Figure 10 Is the explosion diagram of the low-shadow wide-angle loss fast ion detector of the present invention;

[0028] Figure 11 Is the structure schematic diagram of the front part of the collimator of the low-shadow wide-angle loss fast ion detector of the present invention;

[0029] Figure 12 Is the structure schematic diagram of the rear part of the collimator of the low-shadow wide-angle loss fast ion detector of the present invention;

[0030] Figure 13 Is the structure schematic diagram of the detector main body of the low-shadow wide-angle loss fast ion detector of the present invention;

[0031] Figure 14 Is the structure schematic diagram of the scintillator sheet of the low-shadow wide-angle loss fast ion detector of the present invention;

[0032] Figure 15 Is the structure schematic diagram of the optical path connecting pipe of the low-shadow wide-angle loss fast ion detector of the present invention;

[0033] Figure 16 This is the installation schematic diagram of the low-shadow wide-angle loss fast ion detector of the present invention.

[0034] 1. Scintillator sheet; 1.1. Scintillator coating; 2. Front part of collimator; 2.1. Forward collimation front hole; 2.2. Reverse collimation front hole; 2.3. Cavity; 3. Rear part of collimator; 3.1. Forward collimation rear hole; 3.2. Reverse collimation rear hole; 3.3. Boss; 4. Back plate; 5. Detector body; 5.1. Card slot; 6. Graphite shell; 7. Optical path connecting pipe; 8. Rear-end optical path pipeline; 9. Magnetic confinement fusion device; 10. Landing grid; 11. Forward orbit in shadow; 12. Forward orbit outside shadow; 13. Reverse orbit in shadow; 14. Reverse orbit outside shadow; 15. Traditional collimator front hole; 16. Traditional collimator rear hole. 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] As Figures 8 to 16 shown, a low-shadow wide-angle loss fast ion detector for a magnetic confinement fusion device includes a double collimator system and an optical path connecting pipe 7. The double collimator system includes a front part of collimator 2, a rear part of collimator 3, and a scintillator sheet 1. A forward collimation front hole 2.1 and a reverse collimation front hole 2.2 are provided on the front part of collimator 2, and a forward collimation rear hole 3.1 and a reverse collimation rear hole 3.2 are provided on the rear part of collimator 3. The forward collimation front hole 2.1 and the forward collimation rear hole 3.1 constitute the hole channel of the forward collimator, and the reverse collimation front hole 2.2 and the reverse collimation rear hole 3.2 constitute the hole channel of the reverse collimator. The scintillator sheet 1 is arranged on the side of the forward collimator and the reverse collimator. In this example, the lengths of the forward collimation rear hole 3.1 and the reverse collimation rear hole 3.2 are both set to 8 mm, and the distance between the forward collimator and the reverse collimator in the length direction of the scintillator sheet 1 is set to 58 mm, so as to avoid the overlap of the detection areas. One end of the optical path connecting pipe 7 is fixedly arranged on the double collimation system, and the other end of the optical path connecting pipe 7 is provided with an external thread and is used for threaded connection with the rear-end optical path pipeline 8.

[0037] In the present invention, by adopting the layout of two sets of collimators, the forward collimator and the reverse collimator are respectively arranged on both sides of the scintillator sheet 1. Compared with the traditional centralized design of a single collimator, this layout makes the landing points of fast ions with a throw angle close to 90° scattered on the two side edges of the scintillator sheet 1 instead of the middle area, significantly reducing the occlusion of the helical orbits of high-throw-angle ions; by setting the sizes of the forward collimator and the reverse collimator and the lengths of the forward collimated hole 3.1 and the reverse collimated hole 3.2, the overlap between the detection areas of the forward collimator and the reverse collimator can be effectively reduced to solve the problem of detection failure caused by the overlap of detection areas; the optical path connecting pipe 7 is threadedly connected to the rear optical path pipe 8, which can not only ensure the installation stability of the optical path connecting pipe 7, but also freely adjust the spin angle of the detector body 5 around the axis during the process of screwing the optical path connecting pipe 7 into the rear optical path pipe 8, so as to complete the transmission and collection of optical signals.

[0038] Further, the rear side of the front part 2 of the collimator is open and forms a cavity 2.3, and a boss 3.3 is arranged on the front side of the rear part 3 of the collimator. The shape and size of the boss 3.3 match those of the cavity 2.3. The front part 2 of the collimator and the rear part 3 of the collimator are connected by bolts. The forward collimated hole 3.1 and the reverse collimated hole 3.2 both penetrate through the boss 3.3. In the present invention, since the cavity 2.3 of the front part 2 of the collimator matches the shape and size of the boss 3.3 of the rear part 3 of the collimator, the front part 2 of the collimator and the rear part 3 of the collimator can be tightly combined to prevent installation errors. The forward collimating front hole 2.1 and the reverse collimating front hole 2.2 are arranged on the front part 2 of the collimator, and the forward collimated hole 3.1 and the reverse collimated hole 3.2 are arranged on the rear part 3 of the collimator, and the front part 2 and the rear part 3 of the collimator are fixed by bolts so that the relative positions of the forward collimating front hole 2.1, the forward collimated hole 3.1, the reverse collimating front hole 2.2 and the reverse collimated hole 3.2 are fixed, as Figure 5 shown, ensuring that the collimation effect of the collimator will not be affected by the change of the relative positions of the hole positions.

[0039] Further, the double collimator system further includes a detector body 5 for fixedly installing the scintillator sheet 1. The side surface of the detector body 5 is connected to the rear part 3 of the collimator by bolts. A scintillator coating 1.1 is arranged on the side surface of the scintillator sheet 1 facing away from the detector body 5. In the present invention, by setting the detector body 5, an installation basis is provided for the scintillator sheet 1.

[0040] Furthermore, a graphite shell 6 is sleeved on the outer side of the detector body 5. In the present invention, by sleeved the graphite shell 6 on the outside of the detector, it is possible to avoid exposing other metal parts of the device to the vacuum environment of the magnetic confinement fusion device 9, thereby reducing the metal element impurities entering the plasma area and avoiding the experiment from being affected.

[0041] Further, the graphite housing 6 includes a housing body and an upper cover, the top surface of the housing body and a side close to the collimator are both open, the detector body 5 and the back plate 4 are fixed in the housing body, the side opening side of the housing body is detachably connected to the side of the collimator, and the upper cover is arranged on the top of the housing body and is detachably connected to the top surface of the detector body 5. In the present invention, by setting the graphite housing 6 as two parts of the housing body and the upper cover, the assembly and connection of the detector body 5, the back plate 4 and the collimator with the graphite housing 6 can be facilitated.

[0042] Furthermore, a slot 5.1 is provided through the inside of the detector body 5, and a back plate 4 is installed on the side of the detector body 5 facing away from the rear portion 3 of the collimator. One end of the slot 5.1 contacts and cooperates with the side surface of the rear portion 3 of the collimator, and the other end contacts and cooperates with the side surface of the back plate 4. The size of the slot 5.1 matches the size of the scintillator sheet 1, and the scintillator sheet 1 is snap-fitted into the slot 5.1. In the present invention, by opening a card slot 5.1 in the detector body 5, the card connection and fixation of the scintillator sheet 1 is achieved, and at the same time, the size of the scintillator sheet 1 is matched with the size of the card slot 5.1, so that the side of the scintillator sheet 1 and the edge of the card slot 5.1 are located on the same plane. When the back plate 4 and the rear part 3 of the collimator are assembled to the two sides of the detector body 5, the back plate 4 and the rear part 3 of the collimator 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 card slot 5.1 to avoid affecting the assembly accuracy.

[0043] Furthermore, a base made of metal is provided at the bottom of the scintillator sheet 1. In the present invention, a base made of metal material is selected to ensure the mechanical strength of the base.

[0044] Furthermore, the thickness of the base is greater than 0.5 mm. In this example, setting the thickness of the base to be greater than 0.5 mm can effectively prevent the base from being deformed when subjected to external force, thereby improving the reliability of the experiment.

[0045] Assembly process of the present invention: Before the experiment, the device needs to be assembled in a laboratory environment. First, install the scintillator sheet 1 into the card slot 5.1 of the detector body 5 with the scintillator coating 1.1 facing outward, ensuring that the lost fast ions reaching the scintillator sheet 1 can react with the scintillator sheet 1 to emit scintillation light. Then, put the cavity 2.3 of the front collimator 2 over the boss 3.3 of the rear collimator 3 and fix the two with bolts to ensure that the relative positions of the forward collimation front hole 2.1, the forward collimation rear hole 3.1, the reverse collimation front hole 2.2, and the reverse collimation rear hole 3.2 are fixed. Next, fix the rear collimator 3 to one side of the detector body 5 with bolts, and fix the back plate 4 to the other side of the detector body 5 with bolts to completely fix the scintillator sheet 1 in the card slot 5.1. Set the graphite housing 6 outside the detector body 5 to avoid affecting the experiment. Fix one end of the optical path connecting pipe 7 to the detector body 5 with bolts and screw the other end into the rear optical path pipe 8. Finally, send the device into the vacuum environment and close to the plasma region through the vacuum window of the magnetic confinement fusion device 9 to receive the lost fast ions escaping from the plasma region.

[0046] Working principle of the present invention: When the magnetic confinement fusion device 9 is conducting an experiment, a strong toroidal magnetic field will be generated inside it to confine charged particles within a safe plasma region. However, there will still be some fast ions that lose confinement and escape from the plasma region for various reasons. For the lost fast ions with a pitch angle less than 90°, the direction of their combined motion is the same as the magnetic field vector. As Figure 6 shown, during the helical motion, they may enter the detector body 5 through the forward collimation front hole 2.1. Some of the fast ions entering the detector body 5 can pass through the forward collimation rear hole 3.1 and strike the scintillator sheet 1 to emit scintillation light. Their motion trajectory is like the Figure 6 outer positive track 12 in the shadow in. The experimenter can read the energy and pitch angle of the lost ions based on the position of the fluorescence emitted from the scintillator sheet 1, and then inversely calculate the motion trajectory of the lost ions to help study the loss mechanism of high-energy ions. If the pitch angle of the lost fast ions is too close to 90°, its motion trajectory is similar to an extremely compressed spring and will strike the graphite housing 6 before reaching the forward collimation front hole 2.1. Therefore, it will not be detected by the detector of this device. As Figure 6 shown by the positive track 11 in the shadow in, this track is the reverse calculation track of the lost fast ions that are too close to 90°. It will strike the graphite housing 6 within one gyration period. Therefore, in the experiment, the lost fast ions that are too close to 90° are located in the orbital shadow area and cannot be detected normally.

[0047] Similarly, loss fast ions with a throw angle less than 90° may also enter the detector body 5 from the reverse direct front hole 2.2. However, since the movement direction of such ions on the y-axis is the same as the magnetic field vector, after entering the detector body 5 from the reverse direct front hole 2.2, they will immediately hit the side wall near the reverse direct front hole 2.2 in the cavity 2.3 of the front part of the collimator and cannot reach the scintillator sheet 1. Therefore, loss fast ions with a throw angle less than 90° will actually only be detected by the forward collimator.

[0048] For loss fast ions with a throw angle greater than 90°, the direction of their combined motion is opposite to the magnetic field vector, such as the outer reverse orbit 14 in Figure 6 , and they will only be detected by the reverse collimator. Moreover, ions with a throw angle too close to 90° will also be in the orbit shadow area due to the shielding of the graphite outer shell 6, such as the middle reverse orbit 13 in Figure 6 .

[0049] In actual experiments, loss fast ions with a throw angle less than 90° and those greater than 90° may appear simultaneously. Therefore, for the bright spots that appear on the scintillator sheet 1 during the experiment, it is necessary to determine whether they belong to the forward collimator or the reverse collimator before further back-calculating their energy and throw angle, as shown in Figure 7 . The upper landing grid 10 is the detection area of the forward collimator, and the lower landing grid 10 is the detection area of the reverse collimator. There is almost no overlap between the two. Therefore, there is no problem of being unable to determine the attribution of the bright spot due to the overlap of the detection areas of the two collimators. Just based on whether the bright spot appears in the upper half or the lower half of the scintillator sheet 1, its energy and throw angle can be determined, and then the physical process of its loss can be studied.

[0050] The above description is only a preferred embodiment of the present invention and is 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 low-shadow wide-angle loss fast ion detector for a magnetic confinement fusion device, characterized in that Comprising: A double collimator system, including a front collimator (2), a rear collimator (3) and a scintillator sheet (1). A forward front collimation hole (2.1) and a reverse front collimation hole (2.2) are provided on the front collimator (2). A forward rear collimation hole (3.1) and a reverse rear collimation hole (3.2) are provided on the rear collimator (3). The forward front collimation hole (2.1) and the forward rear collimation hole (3.1) form the pore channel of the forward collimator. The reverse front collimation hole (2.2) and the reverse rear collimation hole (3.2) form the pore channel of the reverse collimator. The scintillator sheet (1) is arranged on the side of the forward collimator and the reverse collimator. The lengths of the forward rear collimation hole (3.1) and the reverse rear collimation hole (3.2), and the distance between the forward collimator and the reverse collimator in the y-axis direction are determined by a detector simulation program, which can avoid overlapping of the detection areas. An optical path connecting pipe (7), one end of the optical path connecting pipe (7) is fixedly arranged on the double collimation system, and the other end of the optical path connecting pipe (7) is provided with an external thread and is used for threaded connection with a rear-end optical path pipeline (8).

2. The fast ion detector with low shadow and wide angle loss for a magnetic confinement fusion device according to claim 1, characterized in that: The rear side of the front collimator (2) is open and forms a cavity (2.3). A boss (3.3) is arranged on the front side of the rear collimator (3). The shape and size of the boss (3.3) match those of the cavity (2.3). The front collimator (2) and the rear collimator (3) are connected by bolts. The forward rear collimation hole (3.1) and the reverse rear collimation hole (3.2) both penetrate through the boss (3.3).

3. A low-shadow wide-angle loss fast ion detector for a magnetic confinement fusion device according to claim 1, characterized in that: The double collimator system further includes a detector main body (5) for fixedly installing the scintillator sheet (1). The side of the detector main body (5) is connected to the rear collimator (3) by bolts. A scintillator coating (1.1) is arranged on the side of the scintillator sheet (1) facing away from the detector main body (5).

4. A low-shadow wide-angle loss fast ion detector for a magnetic confinement fusion device according to claim 3, characterized in that: A graphite outer shell (6) is sleeved outside the detector main body (5).

5. The fast ion detector with low shadow and wide angle loss for a magnetic confinement fusion device according to claim 4, characterized in that: A card slot (5.1) is penetrated and opened inside the detector main body (5). A back plate (4) is installed on one side of the detector main body (5) facing away from the rear collimator (3). One end of the card slot (5.1) is in contact and cooperation with the side of the rear collimator (3), and the other end is in contact and cooperation with the side of the back plate (4). And the size of the card slot (5.1) matches the size of the scintillator sheet (1). The scintillator sheet (1) is clamped and fitted in the card slot (5.1).

6. The fast ion detector with low shadow and wide angle loss for a magnetic confinement fusion device according to claim 5, wherein: The graphite outer shell (6) includes a shell main body and an upper cover. The top surface and the side close to the collimator of the shell main body are both open. The detector main body (5) and the back plate (4) are fixed inside the shell main body. The side opening side of the shell main body is detachably connected to the side of the collimator. The upper cover is covered on the top of the shell main body and is detachably connected to the top surface of the detector main body (5).

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: A base made of a metal material is arranged at the bottom of the scintillator sheet (1).

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