A low-shadow wide-angle loss fast ion probe for a magnetic confinement fusion device

Abstract

The application 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 pipe, 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, the collimator rear part is provided with a forward collimation rear hole and a reverse collimation rear hole, the scintillator sheet is arranged on the side of the forward collimator and the reverse collimator, the length of the forward collimation rear hole and the reverse collimation rear hole and the interval of the forward collimator and the reverse collimator in the y-axis direction are determined by a detector simulation program, and the detection area overlap 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 is used for being threadedly connected with a rear-end light path pipe. The application can reduce the orbit shadow under the condition of ensuring the wide projection angle detection range.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of magnetic confinement fusion plasma diagnosis, and particularly relates to a low-shadow wide-angle loss fast ion detector for a magnetic confinement fusion device. BACKGROUND

[0002] The 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 a collimator and a scintillator sheet two main parts. The high-energy ions lost from the confinement escape to the edge of the plasma and are first screened by the collimator. The ions passing through the collimator do Larmor cyclotron motion 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 the energy and pitch angle of the lost ions according to the position of the fluorescence emitted on the scintillator sheet, and then invert the motion track of the lost ions to help study the loss mechanism of high-energy ions.

[0003] As shown in Figure 1 , the greater the energy, that is, the greater the cyclotron radius of the lost fast ion, the greater the x-coordinate position on the scintillator. The angle between the velocity vector of the lost fast ion and the magnetic field vector at its position is defined as the pitch angle of the lost fast ion. If the projection of the velocity vector of the lost 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°, the lost fast ion is called a forward-moving particle, otherwise it is a backward-moving particle. As shown in Figure 2 , the figure includes a traditional collimator front hole 15 and a traditional collimator rear hole 16. Lost 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, the traditional wide-angle loss fast ion detector generally uses a longer collimator rear hole, which mainly has the following problems:

[0004] 1. The track shadow problem is serious. As shown in Figure 3 and Figure 4 , ions with a pitch angle close to 90° are easily blocked by the collimator or the detector structure due to the high compression of their spiral tracks in the traditional detector, forming the gray track shadow area in Figure 4 . Under the traditional design, such ions will fall in the middle position of the scintillator if not blocked, but their actual tracks are blocked by the detector body, resulting in that the ions in this pitch angle range cannot be effectively detected, which seriously limits the detection angle range.

[0005] 2. Overlapping Detection Regions of Dual Collimators. Loss fast ions with specific energies and throw angles will strike specific locations on the scintillator after passing through a single collimator. If we statistically analyze the impact locations of all loss fast ions with different energies and throw angles after passing through the collimator, we obtain a region—the area affected by that collimator. Each coordinate within this region corresponds to an ion with a certain energy and throw angle; therefore, this region is called the detection region of that collimator. If two collimators are simply used, the detection regions defined by the two collimators on the scintillator sheet may partially overlap. The bright spots in the overlapping area cannot be clearly assigned, leading to errors in energy and throw angle calculations and affecting the accuracy of data inversion.

[0006] 3. The detector's installation angle is not adjustable. When the magnetic field vector, such as... Figure 4 As shown, the detector has the highest detection efficiency for fast ions when the detector is parallel to the long side of the scintillator. Traditional detectors are often fixed by bolts when installed on the back-end optical path pipe. 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 address the problems in the background art, this invention proposes a low-shadow, wide-angle-loss fast ion detector for magnetic confinement fusion devices. This invention can reduce orbital shadowing while ensuring a wide throw angle detection range.

[0008] To solve the above problems, the present invention adopts the following technical solution: a low-shadowing, wide-angle-loss fast ion detector for a magnetic confinement fusion device, comprising a dual collimator system, a scintillator sheet, a detector main body structure, a graphite shell, and an optical path connecting tube. The dual collimator system includes a collimator front part, a collimator rear part, and a scintillator sheet. The collimator front part has a forward collimation front hole and a reverse collimation front hole, and the collimator rear part has a forward collimation rear hole and a reverse collimation rear hole. The forward collimation front hole and the forward collimation rear hole... The collimation rear hole forms the channel of the forward collimator, and the reverse collimation front hole and the reverse collimation rear hole form the channel of the reverse collimator. The scintillator piece is disposed on the side of the forward collimator and the reverse collimator. The dual collimator system and the scintillator piece are both fixed to the detector main body structure, and the detector main body structure is covered with a graphite shell. One end of the optical path connecting tube is fixed to the detector main body structure, and the other end of the optical path connecting tube is provided with an external thread for threaded connection with the rear optical path pipe.

[0009] In the application, by adopting the layout of two collimators, the forward collimator and the reverse collimator are arranged on the two sides of the scintillator sheet, compared with the traditional single collimator design in the middle, the layout makes the loss of the ion with the pitch angle close to 90° scattered on the two side edges of the scintillator sheet instead of the middle area, which significantly reduces the shielding of the high pitch angle ion spiral track; by setting the size of the forward collimator and the reverse collimator and the length of the forward collimated hole and the reverse collimated hole, the overlap of the detection area of the forward collimator and the detection area of the reverse collimator can be effectively reduced to solve the problem of detection failure caused by the overlap of the detection area; the light path connecting pipe is screwed on the rear end light path pipe, which not only ensures the installation stability of the light path connecting pipe, but also can freely adjust the spin angle of the detector main body around the axis during the process of screwing the light path connecting pipe into the rear end light path pipe, so as to complete the transmission and collection of optical signals.

[0010] Further, the rear side of the front part of the collimator is opened and formed with a cavity, the front side of the rear part of the collimator is provided with a boss, the boss is matched with the shape and size of the cavity, the front part of the collimator and the rear part of the collimator are connected by bolts, and the forward collimated hole and the reverse collimated hole are both arranged on the boss. In the application, since the cavity of the front part of the collimator is matched with the shape and size of the boss of the rear part of the collimator, the front part of the collimator and the rear part of the collimator can be closely combined to prevent installation errors. The forward collimated hole and the reverse collimated 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 of the collimator and the rear part of the collimator are fixed by bolts, so that the relative positions of the forward collimated hole, the reverse collimated hole, the forward collimated hole and the reverse collimated hole are fixed, and the collimation effect of the collimator is ensured not to be affected by the change of the relative positions of the holes.

[0011] Further, the double collimator system further comprises a detector main body for fixedly mounting the scintillator sheet, the side surface of the detector main body is connected with the rear part of the collimator by bolts, and one side of the scintillator sheet is coated with a scintillator coating. In the application, the detector main body is arranged to provide a mounting basis for the scintillator sheet.

[0012] Further, the outer side of the detector main body is sleeved with a graphite shell. In the application, by sleeving the graphite shell on the outside of the detector, other metal parts 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] Further, the graphite shell comprises a shell body and an upper cover, the top surface and the side close to the collimator of the shell body are both open, the detector body and the back plate are fixed in the shell body, the side open side of the shell body is detachably connected with the side of the collimator, and the upper cover is arranged on the top of the shell body and is detachably connected with the top surface of the detector body. In the application, the graphite shell is arranged as two parts of the shell body and the upper cover, so that the detector body, the back plate and the collimator can be conveniently assembled and connected with the graphite shell.

[0014] Further, the inside of the detector body is provided with a clamping groove, the side of the detector body away from the rear part of the collimator is provided with a back plate, one end of the clamping groove is in contact with the side of the rear part of the collimator, the other end is in contact with the side of the back plate, and the size of the clamping groove matches the size of the scintillator sheet. In the application, the clamping groove is arranged in the detector body, so that the scintillator sheet is clamped and fixed, and the size of the scintillator sheet matches the size of the clamping groove, so that the side of the scintillator sheet and the edge of the clamping groove are located on the same plane. When the back plate and the rear part of the collimator are assembled to the two sides of the detector body, the back plate and the rear part of the collimator can abut the two sides of the scintillator sheet, so that the scintillator sheet can be completely fixed and will not fall off, and the two sides of the scintillator sheet will not protrude from the clamping groove, so as to avoid affecting the assembly precision.

[0015] Further, the bottom of the scintillator sheet is provided with a base made of metal. In the application, the base is made of metal to ensure the mechanical strength of the base.

[0016] The application has the following beneficial effects: the application adopts the layout of two sets of collimators, and the forward collimator and the reverse collimator are arranged on the two sides of the scintillator sheet. Compared with the traditional single collimator design in the middle, the layout makes the loss of ion spiral track with a pitch angle close to 90° dispersed on the two side edges of the scintillator sheet instead of the middle area, which significantly reduces the shielding of the ion spiral track with a pitch angle close to 90°. The length of the forward collimator rear hole and the reverse collimator rear hole and the distance between the two rear holes on the y-axis can be reasonably set through the corresponding development of the detector simulation program, so as to effectively reduce 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 light path connecting pipe is screw-connected to the rear end light path pipe, which not only ensures the installation stability of the light path connecting pipe, but also can freely adjust the spin angle of the detector body around the axis during the process of screwing the light path connecting pipe into the rear end light path pipe, so as to complete the transmission and collection of optical signals. BRIEF DESCRIPTION OF DRAWINGS

[0017] The application will be further described in combination with the drawings and examples.

[0018] Figure 1 Front view of the principle of the conventional wide-angle lossy ionization detector;

[0019] Figure 2 Top view of the principle of the conventional wide-angle lossy ionization detector;

[0020] Figure 3 Detection orbit diagram of the conventional wide-angle lossy ionization detector;

[0021] Figure 4 Orbit shadow diagram of the conventional wide-angle lossy ionization detector;

[0022] Figure 5 Top view of the principle of the low-shadow wide-angle lossy ionization detector of the present application;

[0023] Figure 6 Detection orbit diagram of the low-shadow wide-angle lossy ionization detector of the present application;

[0024] Figure 7 Orbit shadow diagram of the low-shadow wide-angle lossy ionization detector of the present application;

[0025] Figure 8 Front view of the low-shadow wide-angle lossy ionization detector of the present application;

[0026] Figure 9 Perspective structural schematic diagram of the low-shadow wide-angle lossy ionization detector of the present application;

[0027] Figure 10 Exploded view of the low-shadow wide-angle lossy ionization detector of the present application;

[0028] Figure 11 Structural schematic diagram of the front part of the collimator of the low-shadow wide-angle lossy ionization detector of the present application;

[0029] Figure 12 Structural schematic diagram of the rear part of the collimator of the low-shadow wide-angle lossy ionization detector of the present application;

[0030] Figure 13 Structural schematic diagram of the detector main body of the low-shadow wide-angle lossy ionization detector of the present application;

[0031] Figure 14 Structural schematic diagram of the scintillator sheet of the low-shadow wide-angle lossy ionization detector of the present application;

[0032] Figure 15 Structural schematic diagram of the light path connecting tube of the low-shadow wide-angle lossy ionization detector of the present application;

[0033] Figure 16 Figure 1 is a schematic diagram of the installation of the low-shadow wide-angle loss fast ion probe of the present application.

[0034] 1, scintillator sheet; 1.1, scintillator coating; 2, collimator front part; 2.1, forward collimating front hole; 2.2, reverse collimating front hole; 2.3, cavity; 3, collimator rear part; 3.1, forward collimating rear hole; 3.2, reverse collimating rear hole; 3.3, boss; 4, back plate; 5, probe body; 5.1, clamping groove; 6, graphite shell; 7, light path connecting tube; 8, rear-end light path tube; 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. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0036] As shown in Figures 8 to 16 Figure 1, a low-shadow wide-angle loss fast ion probe for a magnetic confinement fusion device includes a double collimator system and a light path connecting tube 7, the double collimator system includes a collimator front part 2, a collimator rear part 3 and a scintillator sheet 1, the collimator front part 2 is provided with a forward collimating front hole 2.1 and a reverse collimating front hole 2.2, the collimator rear part 3 is provided with a forward collimating rear hole 3.1 and a reverse collimating rear hole 3.2, the forward collimating front hole 2.1 and the forward collimating rear hole 3.1 constitute a hole channel of a forward collimator, the reverse collimating front hole 2.2 and the reverse collimating rear hole 3.2 constitute a hole channel of a reverse collimator, the scintillator sheet 1 is arranged on the side of the forward collimator and the reverse collimator, in this example, the length of the forward collimating rear hole 3.1 and the reverse collimating rear hole 3.2 is 8 mm, and the spacing of the forward collimator and the reverse collimator in the length direction of the scintillator sheet 1 is 58 mm, so as to avoid the overlap of the detection area; one end of the light path connecting tube 7 is fixedly arranged on the double collimator system, and the other end of the light path connecting tube 7 is provided with external threads and is used for being threadedly connected with a rear-end light path tube 8.

[0037] In the present application, by adopting the layout of two collimators, the forward collimator and the reverse collimator are respectively arranged on the two sides of the scintillator sheet 1. Compared with the traditional single collimator design in the middle, this layout makes the loss of the ion with the pitch angle close to 90° scattered on the two side edges of the scintillator sheet 1 instead of the middle area, which significantly reduces the shielding of the high pitch angle ion spiral track. By setting the size of the forward collimator and the reverse collimator and the length of the forward collimated rear hole 3.1 and the reverse collimated rear hole 3.2, the overlap of the detection area of the forward collimator and the detection area of the reverse collimator can be effectively reduced to solve the problem of detection failure caused by the overlap of the detection area. The light path connecting pipe 7 is screwed onto the rear end light path pipe 8, which not only ensures the installation stability of the light path connecting pipe 7, but also allows the rotation angle of the detector main body 5 around the axis to be freely adjusted according to the experimental conditions during the process of screwing the light path connecting pipe 7 into the rear end light path pipe 8, thereby completing the transmission and collection of optical signals.

[0038] Further, the rear side of the collimator front part 2 is opened and formed with a cavity 2.3, the front side of the collimator rear part 3 is provided with a boss 3.3, the boss 3.3 matches the shape and size of the cavity 2.3, the collimator front part 2 and the collimator rear part 3 are connected by bolts, and the forward collimated rear hole 3.1 and the reverse collimated rear hole 3.2 are both arranged on the boss 3.3. In the present application, since the cavity 2.3 of the collimator front part 2 matches the shape and size of the boss 3.3 of the collimator rear part 3, the collimator front part 2 and the collimator rear part 3 can be tightly combined to prevent installation errors. The forward collimated front hole 2.1 and the reverse collimated front hole 2.2 are arranged on the collimator front part 2, the forward collimated rear hole 3.1 and the reverse collimated rear hole 3.2 are arranged on the collimator rear part 3, and the collimator front part 2 and the collimator rear part 3 are fixed by bolts, so that the relative positions of the forward collimated front hole 2.1, the forward collimated rear hole 3.1, the reverse collimated front hole 2.2 and the reverse collimated rear hole 3.2 are fixed, as shown in Figure 5 , which ensures that the collimation effect of the collimator will not be affected by the change of the relative position of the hole.

[0039] Further, the double collimator system further comprises a detector main body 5 for fixedly mounting the scintillator sheet 1, the side surface of the detector main body 5 is connected with the collimator rear part 3 by bolts, and the side surface of the scintillator sheet 1 away from the detector main body 5 is provided with a scintillator coating 1.1. In the present application, the detector main body 5 is arranged to provide a mounting basis for the scintillator sheet 1.

[0040] Further, the outer side of the detector body 5 is sleeved with a graphite shell 6. In the present application, by sleeving the graphite shell 6 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 9, thereby reducing the metal element impurities entering the plasma region and avoiding the influence on the experiment.

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

[0042] Further, the inside of the detector body 5 is provided with a clamping groove 5.1, the side of the detector body 5 away from the rear part 3 of the collimator is provided with a back plate 4, one end of the clamping groove 5.1 is in contact with the side of the rear part 3 of the collimator, the other end is in contact with the side of the back plate 4, and the size of the clamping groove 5.1 matches the size of the scintillator sheet 1, and the scintillator sheet 1 is clamped in the clamping groove 5.1. In the present application, by arranging the clamping groove 5.1 in the detector body 5, the scintillator sheet 1 is clamped and fixed, and the size of the scintillator sheet 1 matches the size of the clamping groove 5.1, so that the side of the scintillator sheet 1 is located in the same plane as the edge of the clamping groove 5.1, 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 the two sides of the scintillator sheet 1, so that the scintillator sheet 1 can be completely fixed and will not fall off, and the two sides of the scintillator sheet 1 will not protrude from the clamping groove 5.1, avoiding affecting the assembly precision.

[0043] Further, the bottom of the scintillator sheet 1 is provided with a base made of metal. In the present application, the base is made of metal to ensure the mechanical strength of the base.

[0044] Further, the thickness of the base is greater than 0.5mm. In the present example, the thickness of the base is set to be greater than 0.5mm, which can effectively prevent the base from deforming when subjected to external force, thereby improving the reliability of the experiment.

[0045] The assembling process of the present application: before the experiment, the device needs to be assembled in the laboratory environment, first, the scintillator sheet 1 is installed into the card slot 5.1 of the detector main body 5 with the scintillator coating 1.1 outward, ensuring that the loss fast ions reaching the scintillator sheet 1 can react with the scintillator sheet 1 to emit scintillation light, then the cavity 2.3 of the collimator front part 2 is sleeved into the boss 3.3 of the collimator rear part 3, and the two are fixed by bolts, ensuring 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 remain fixed, then the collimator rear part 3 is fixed to one side of the detector main body 5 by bolts, the back plate 4 is fixed to the other side of the detector main body 5 by bolts, realizing the complete fixation of the scintillator sheet 1 in the card slot 5.1, the graphite shell 6 is sleeved on the outside of the detector main body 5 to avoid affecting the experiment, one end of the light path connecting pipe 7 is fixed to the detector main body 5 by bolts, and the other end is screwed into the rear end light path pipe 8, finally the device is sent into the vacuum environment through the vacuum window of the magnetic confinement fusion device 9 and approaches the plasma region, so as to receive the loss fast ions escaping from the plasma region.

[0046] The working principle of the present application: when the magnetic confinement fusion device 9 conducts the experiment, a strong toroidal magnetic field will be generated inside, which is used to constrain the charged particles inside the safe plasma region, but part of the fast ions will lose constraint and escape from the plasma region due to various reasons, for the loss fast ions with a pitch angle less than 90°, its combined motion direction is the same as the magnetic field vector, as shown in Figure 6 , it may enter the detector main body 5 from the forward collimation front hole 2.1 during the spiral motion process, part of the fast ions entering the detector main body 5 can pass through the forward collimation rear hole 3.1 and hit the scintillator sheet 1 to emit scintillation light, its motion track is the shadow outer forward track 12 in Figure 6 , the experimenter can read the energy and pitch angle of the loss ion according to the position of the fluorescent light emitted on the scintillator sheet 1, and then inversely calculate the motion track of the loss ion, helping to study the loss mechanism of high-energy ions, if the pitch angle of the loss fast ion is too close to 90°, its motion track is similar to a compressed spring, it will hit the graphite shell 6 before reaching the forward collimation front hole 2.1, so it cannot be detected by the detector of the device, as shown in Figure 6 , the shadow inner forward track 11 is the reverse calculation track of the loss fast ion too close to 90°, which hits the graphite shell 6 in one gyration period, so the loss fast ion too close to 90° in the experiment is located in the track shadow area and cannot be normally detected.

[0047] Similarly, loss fast ions with pitch angle less than 90° can also enter the detector body 5 from the reverse collimation front hole 2.2, but since the motion direction of this kind of ions in the y-axis is the same as the magnetic field vector, it will immediately hit the side wall of the cavity 2.3 of the collimator front part 2 near the reverse collimation front hole 2.2 after entering the detector body 5 from the reverse collimation front hole 2.2, and cannot reach the scintillator sheet 1, so the loss fast ions with pitch angle less than 90° will actually only be detected by the forward collimator.

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

[0049] In actual experiments, loss fast ions with pitch angle less than 90° and greater than 90° can appear at the same time, so for bright spots appearing on the scintillator sheet 1 in the experiment, it is necessary to determine whether they belong to the forward collimator or the reverse collimator, and then further deduce their energy and pitch angle, such as Figure 7 , the upper drop grid 10 is the detection area of the forward collimator, and the lower drop grid 10 is the detection area of the reverse collimator, and there is almost no overlap between the two, so there is no problem of being unable to determine the attribution of the bright spot caused by the overlap of the detection areas of the two collimators, and it is only necessary to determine the energy and pitch angle of the bright spot according to whether it appears in the upper half or lower half of the scintillator sheet 1, and then study the physical process of its loss.

[0050] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A low-shadow wide-angle loss-of-quick-ion probe for a magnetic confinement fusion device, characterized by, include: A dual collimator system includes a collimator front part (2), a collimator rear part (3), and a scintillator plate (1). The collimator front part (2) has a forward collimation front hole (2.1) and a reverse collimation front hole (2.2). The collimator rear part (3) has a forward collimation rear hole (3.1) and a reverse collimation rear hole (3.2). The forward collimation front hole (2.1) and the forward collimation rear hole (3.1) constitute the channel of the forward collimator. The reverse collimation front hole (2.2) and the reverse collimation rear hole (3.2) constitute the channel of the reverse collimator. The scintillator piece (1) is disposed on the side of the forward collimator and the reverse collimator. The lengths of the forward collimation rear hole (3.1) and the reverse collimation rear hole (3.2) and the distance between the forward collimator and the reverse collimator in the y-axis direction are determined by the detector simulation program, which can avoid the overlap of the detection area. Optical path connecting pipe (7), one end of which is fixed on the dual collimator system, and the other end of which is provided with external thread and used for threaded connection with the rear optical path pipe (8).

2. A low-shadow wide-angle loss-free ion probe for a magnetic confinement fusion device according to claim 1, characterized in that: The front part (2) of the collimator has an opening on the rear side and forms a cavity (2.3). The front part (3) of the collimator has a boss (3.3). The boss (3.3) matches the shape and size 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 collimation rear hole (3.1) and the reverse collimation rear hole (3.2) are both provided through the boss (3.3).

3. A low-shadowing, wide-angle-loss fast ion detector for a magnetic confinement fusion device according to claim 1, characterized in that: The dual collimator system also includes a detector body (5) for fixing the scintillator plate (1). The side of the detector body (5) is connected to the rear part (3) of the collimator by bolts. The side of the scintillator plate (1) facing away from the detector body (5) is provided with a scintillator coating (1.1).

4. A low-shadowing, wide-angle-loss fast ion detector for a magnetic confinement fusion device according to claim 3, characterized in that: The detector body (5) is fitted with a graphite shell (6) on its outer side.

5. A low-shadowing, wide-angle-loss fast ion detector for a magnetic confinement fusion device according to claim 4, characterized in that: The detector body (5) has a through slot (5.1) inside. A back plate (4) is installed on the side of the detector body (5) away from the rear part (3) of the collimator. One end of the slot (5.1) is in contact with the side of the rear part (3) of the collimator, and the other end is in contact with the side of the back plate (4). The size of the slot (5.1) matches the size of the scintillator piece (1). The scintillator piece (1) is snapped into the slot (5.1).

6. A low-shadowing, wide-angle-loss fast ion detector for a magnetic confinement fusion device according to claim 5, characterized in that: The graphite shell (6) includes a shell body and a top cover. The top surface of the shell body and the side near the collimator are open. The detector body (5) and the back plate (4) are fixed inside the shell body. The side opening of the shell body is detachably connected to the side of the collimator. The top cover is placed on the top of the shell body and is detachably connected to the top surface of the detector body (5).

7. A low-shadowing, wide-angle-loss fast ion detector for a magnetic confinement fusion device according to any one of claims 1 to 6, characterized in that: The bottom of the scintillator sheet (1) is provided with a metal base.

Images