High-vacuum light-shielding scintillator imaging sealing structure

Abstract

The invention belongs to the technical field of scintillator imaging detection, and particularly discloses a high-vacuum light-shielding scintillator imaging sealing structure which comprises a scintillator high-vacuum cylinder, a light-shielding exhaust multi-stage structure and a beryllium window pinhole imaging structure. The light-shielding exhaust multi-stage structure comprises a light-shielding exhaust barrel and at least two light-shielding exhaust rings, the adjacent light-shielding exhaust rings are connected in the light-shielding exhaust barrel at intervals, a plurality of exhaust holes distributed in the circumferential direction are formed in the end face of each light-shielding exhaust ring, and the two ends of the light-shielding exhaust barrel are communicated with each other; one end of the scintillator high-vacuum cylinder sequentially passes through the light-shielding exhaust ring, is positioned in the light-shielding exhaust cylinder and is connected with the light-shielding exhaust cylinder and the beryllium window pinhole imaging structure; a scintillator is connected in the scintillator high-vacuum cylinder, and an exhaust port is formed in the scintillator high-vacuum cylinder. The scintillator imaging sealing structure can perform multi-layer reflection shielding on visible light stray light, realizes efficient and rapid discharge of gas in a high-vacuum cavity, and improves the detection efficiency and the resolution capability of the scintillator imaging sealing structure under a high-vacuum condition.

Description

Technical Field

[0001] The invention relates to the technical field of scintillator imaging detection, and in particular to a high vacuum light-shielding scintillator imaging sealing structure. Background Art

[0002] In magnetic confinement fusion experiments, soft X-ray radiation is mainly bremsstrahlung radiation generated by Coulomb collisions of electrons. By detecting soft X-ray radiation, important information about the electron density and temperature distribution in the plasma can be obtained. High-speed soft X-ray imaging diagnosis is based on the complete plasma polar (perpendicular to the toroidal magnetic field) cross-section detection of beryllium windows, scintillators, image transmission fiber bundles, image intensifiers and high-speed CMOS cameras. In particular, it can be arranged tangentially along the plasma ring (toroidal magnetic field direction), and can directly obtain two-dimensional imaging of soft X-ray radiation distribution and disturbance structure. Due to the need to achieve high-speed and high-resolution detection of soft X-ray radiation, the beryllium window and scintillator imaging part at the forefront of the diagnosis need to be able to detect soft X-rays of sufficient intensity, perform efficient conversion from soft X-rays to visible light, obtain visible light signals with a sufficiently high signal-to-noise ratio, and ensure that high-gain conversion can be performed when the visible light is transmitted to the image intensifier. The beryllium window used for diagnosis is only about 5um thick, which is very thin and easy to break. The coating thickness of the scintillator is only about 20um, and the output signal is relatively weak, but it responds to both soft X-rays and visible light and is easily interfered by strong stray light. The substrate of the scintillator is a glass plate. If an ordinary rubber ring is used to seal the glass plate, the high vacuum sealing performance is unstable and can be easily damaged within an experimental operation cycle.

[0003] Among them, the beryllium window and scintillator built into the vacuum chamber are integrated through a high vacuum light-shielding scintillator imaging sealing structure, which will complete the shielding of visible light and ultraviolet light, realize the efficient conversion of soft X-ray to visible light imaging, and obtain a high vacuum (10-5pa) cavity seal. The following problems need to be solved: (1) efficient shielding of strong stray light, (2) rapid emptying of the gas retained in the cavity after the fusion device is inflated, (3) the tolerance of the beryllium window to high-pressure retained gas, and (4) the reliability and safety of the scintillator sealing surface under high vacuum conditions. Summary of the invention

[0004] The invention provides a high vacuum light-shielding scintillator imaging sealing structure, which aims to perform multi-layer reflection shielding on visible light stray light.

[0005] The present invention is realized by the following technical scheme: a high vacuum light-shielding scintillator imaging sealing structure, comprising a scintillator high vacuum cylinder, a light-shielding exhaust multi-stage structure and a beryllium window pinhole imaging structure;

[0006] The light-shielding exhaust multi-stage structure comprises a light-shielding exhaust cylinder and at least two light-shielding exhaust rings, wherein adjacent light-shielding exhaust rings are connected inside the light-shielding exhaust cylinder at intervals, and a plurality of circumferentially distributed exhaust holes are provided on the end faces of the light-shielding exhaust rings, and the two ends of the light-shielding exhaust cylinder are interconnected;

[0007] One end of the scintillator high vacuum cylinder passes through the light-shielding exhaust ring in sequence and is located inside the light-shielding exhaust cylinder and is connected to the light-shielding exhaust cylinder and the beryllium window pinhole imaging structure; a scintillator is connected inside the scintillator high vacuum cylinder to seal it, and an exhaust port is opened on the scintillator high vacuum cylinder at a position inside the light-shielding exhaust cylinder.

[0008] In this scheme, the scintillator is the sealing surface of the scintillator high vacuum cylinder, and the exhaust port is the outlet for the retained gas to enter the light-shielding exhaust multi-stage structure.

[0009] In this scheme, the light emitted by the plasma in the vacuum device passes through the beryllium window pinhole imaging structure to complete the filtering of visible light and ultraviolet light, passes through the scintillator high vacuum cylinder, and converts the soft X-rays entering the scintillator high vacuum cylinder into visible light through the scintillator, completing the transmission and conversion of the X-rays passing through the beryllium window, and transmits the converted visible light to the device outside the device for signal amplification and high-speed detection. When the visible light emitted by the plasma and the stray light in the device pass through the light-shielding exhaust ring at the end of the light-shielding exhaust cylinder in the light-shielding exhaust multi-stage structure, most of the light is blocked by the light-shielding exhaust ring, and a small part of the light enters the light-shielding exhaust cylinder through the exhaust hole on the light-shielding exhaust ring. Since there are at least two light-shielding exhaust rings, the incoming light can be shielded by multi-layer reflection, which effectively avoids the interference of visible light on the scintillator and greatly improves the contrast and clarity of scintillator imaging.

[0010] Through the arrangement of multi-stage light-shielding exhaust rings, multi-stage reflective shielding is achieved to block the entry of strong stray light. The multi-stage light-shielding exhaust rings form a multi-stage cavity. In this way, through the arrangement of the multi-stage cavity, the entry of inflation gas is delayed and the discharge of retained gas is accelerated.

[0011] Furthermore, the exhaust holes on two adjacent light-shielding exhaust rings are arranged alternately.

[0012] Beneficial effect: In the present scheme, the exhaust holes on adjacent light-shielding exhaust rings are staggered, so that each light-shielding exhaust ring can reflect the incoming light source. Compared with when the exhaust holes on adjacent light-shielding exhaust rings are arranged opposite each other, the light source will directly enter from the opposite exhaust hole. In this way, the light-shielding exhaust ring has a poor reflection effect on the light source, and thus has a poor shielding effect on visible light and stray light. The design of the present scheme can prevent the incoming light source from directly entering through the opposite exhaust holes on adjacent light-shielding exhaust rings. The staggered exhaust holes in the present scheme can reflect the light source step by step between adjacent light-shielding exhaust rings, thereby achieving a multi-stage shielding effect, which can effectively avoid the interference of visible light on the scintillator.

[0013] Furthermore, there are three light-shielding exhaust rings, which are respectively a first-level light-shielding exhaust ring, a second-level light-shielding exhaust ring and a third-level light-shielding exhaust ring. The first-level light-shielding exhaust ring, the second-level light-shielding exhaust ring and the third-level light-shielding exhaust ring are sequentially connected in the light-shielding exhaust tube from the outside to the inside.

[0014] Beneficial effects: The arrangement of three light-shielding exhaust rings in this solution can achieve three-layer shielding of visible light and stray light, and the shielding effect is better.

[0015] Furthermore, the exhaust port is located between a light-shielding exhaust ring close to the beryllium window pinhole imaging structure and the beryllium window pinhole imaging structure.

[0016] Beneficial effect: Such an arrangement enables the light source to pass through multiple light-shielding exhaust rings in sequence for reflection shielding, thereby reducing or avoiding the situation inside the high vacuum cylinder of the light source scintillator.

[0017] Furthermore, on the exhaust path from the exhaust port to the outside, the cavity volume between the light-shielding exhaust ring located at the innermost side of the light-shielding exhaust tube and one end of the light-shielding exhaust tube close to the beryllium window pinhole imaging structure and the cavity volume formed between adjacent light-shielding exhaust rings decrease successively.

[0018] Beneficial effect: In the present scheme, since the cavity volumes between multiple light-shielding exhaust rings and between the light-shielding exhaust ring and the end of the light-shielding exhaust tube are inconsistent, and the cavity volume between the light-shielding exhaust ring and the end of the light-shielding exhaust tube close to the beryllium window pinhole imaging structure and the cavity volume formed between adjacent light-shielding exhaust rings decrease successively, the pressures between the various cavities are different, forming a pressure difference. In this way, the gas that enters the scintillator high vacuum tube through the inflation of the fusion device can be beneficial to the pressure difference change of each cavity when the exhaust system is evacuated in the later stage, so that the gas in the scintillator high vacuum tube is quickly discharged from the exhaust port through the exhaust holes on the multiple light-shielding exhaust rings in sequence.

[0019] Furthermore, the exhaust port and the exhaust hole on the light-shielding exhaust ring are arranged with their axes perpendicular to each other.

[0020] Beneficial effect: Such a setting can change the propagation path of the light source. The exhaust port and the exhaust hole are set vertically, which can reflect the light source again, and the shielding effect is better. It can further reduce or avoid the light source entering the high vacuum tube of the scintillator and causing interference to the scintillator.

[0021] Furthermore, the beryllium window pinhole imaging structure includes a pinhole pressure plate, a support plate and a beryllium window, a groove is provided at one end of the support plate, the beryllium window is embedded in the groove, a connecting pinhole is provided on the pinhole pressure plate and the support plate, the pinhole pressure plate and the support plate are connected to each other, and the beryllium window is located between the pinhole pressure plate and the support plate.

[0022] Beneficial effect: In this solution, the pinhole pressing plate and the supporting plate are connected to each other to limit the beryllium window, and the beryllium window is embedded in the groove of the supporting plate, and the groove can play a positioning role in the installation of the beryllium window.

[0023] Furthermore, the pinhole is trumpet-shaped.

[0024] Beneficial effect: Due to the use of a trumpet-shaped pinhole, the angle of the incident light is expanded and the flux of the incident light is increased.

[0025] Furthermore, there is a gap between the pinhole pressing plate and the supporting plate.

[0026] Beneficial effect: In this solution, there is a gap between the pinhole pressure plate and the support plate, so that when the device is evacuated, a buffer space is provided for the beryllium window embedded in the groove, which can buffer the destructive force caused by the pressure difference inside and outside the high vacuum chamber and enhance the protection of the beryllium window.

[0027] Furthermore, a beryllium window connecting flange, a device sealing flange and a scintillator sealing flange are connected to the scintillator high vacuum cylinder; the beryllium window connecting flange is connected to the ends of the beryllium window vacuum imaging structure and the light-shielding exhaust multi-stage structure; the device sealing flange is connected to the window flange of the magnetic confinement device; and the scintillator is connected to the scintillator sealing flange.

[0028] Beneficial effects: The setting of the beryllium window connecting flange in this scheme facilitates the connection between the scintillator high vacuum cylinder and the beryllium window vacuum imaging structure and the light-shielding exhaust multi-stage structure, and the device sealing flange is convenient for connection with the window flange of the magnetic confinement device, thereby facilitating the connection of the entire high vacuum light-shielding scintillator imaging sealing structure in this scheme with the vacuum device; the setting of the scintillator sealing flange facilitates the fixing of the scintillator.

[0029] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0030] 1. The high vacuum light-shielding scintillator imaging sealing structure of the present invention can perform multi-layer reflection shielding on visible light stray light, and at the same time realize efficient and rapid discharge of gas in the high vacuum cavity. It increases the flux of incident light, enhances the effective protection of the beryllium window, reduces the safety risk of the high vacuum sealed optical path, develops a soft X-ray scintillator imaging detection sealing structure, expands the application scenarios, and enhances the flexibility and reliability of the detection system.

[0031] 2. The scintillator high vacuum cylinder, the light-shielding exhaust multi-stage structure and the beryllium window pinhole imaging structure are interconnected into one. Through this integrated design, a high vacuum light-shielding scintillator imaging sealing structure of the present invention achieves effective shielding of strong stray light and realizes efficient conversion of soft X-rays to visible light under high vacuum conditions.

[0032] 3. The beryllium window can block visible light and ultraviolet light. The trumpet-shaped pinhole design increases the flux of incident light. The embedded beryllium window installation structure enhances the protection of the beryllium window. The gap between the support plate and the protrusion on the pinhole pressure plate provides a buffer space for the beryllium window to be subjected to pressure later.

[0033] 4. The light-shielding exhaust multi-stage structure fixes the first-stage light-shielding exhaust ring, the second-stage light-shielding exhaust ring and the third-stage light-shielding exhaust ring from the outside to the inside of the light-shielding exhaust cavity. Through multi-stage reflection shielding, the entry of visible light and stray light is blocked. Through the multi-stage cavity arrangement, the entry of inflation gas is delayed and the discharge of retained gas is accelerated.

[0034] 5. The scintillator high vacuum cylinder is connected to the beryllium window pinhole imaging structure and the light-shielding exhaust multi-stage structure by a beryllium window connecting flange. The exhaust port discharges the gas in the high vacuum cavity to the light-shielding exhaust multi-stage structure. The device sealing flange connects the scintillator high vacuum cavity to the device window. The scintillator is welded to the scintillator sealing flange. A part of the scintillator is located in the scintillator high vacuum cylinder, serving as the sealing surface of the scintillator high vacuum cylinder. The scintillator converts the soft X-rays entering the high vacuum cavity of the scintillator high vacuum cylinder into visible light. By means of the scintillator sealing flange externally disposed on the window flange of the magnetic confinement device, the scintillator can be installed inside the scintillator high vacuum cylinder for sealing, thereby reducing the safety risk of the high vacuum sealing optical path. By means of the scintillator sealing flange externally disposed on the window flange of the magnetic confinement device, the reliability and safety of the scintillator sealing surface under high vacuum conditions are ensured.

[0035] 6. The present invention effectively solves the problems encountered in the scintillator imaging sealing structure: efficient shielding of visible light stray light, efficient and rapid discharge of gas in the cavity under high vacuum conditions, increased incident light flux, enhanced tolerance of the beryllium window to high-pressure retained gas, and reliability and safety of the scintillator sealing surface, and is very suitable for high-speed soft X-ray imaging diagnosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0037] Figure 1 It is a structural schematic diagram of an embodiment of a high vacuum light-shielding scintillator imaging sealing structure of the present invention;

[0038] Figure 2It is a structural schematic diagram of a scintillator high vacuum cylinder in an embodiment of a high vacuum light-shielding scintillator imaging sealing structure of the present invention;

[0039] Figure 3 It is a structural schematic diagram of a light-shielding exhaust multi-stage structure in an embodiment of a high vacuum light-shielding scintillator imaging sealing structure of the present invention;

[0040] Figure 4 It is a structural schematic diagram of a first-level light-shielding exhaust ring in an embodiment of a high-vacuum light-shielding scintillator imaging sealing structure of the present invention;

[0041] Figure 5 It is a structural schematic diagram of a secondary light-shielding exhaust ring in an embodiment of a high vacuum light-shielding scintillator imaging sealing structure of the present invention;

[0042] Figure 6 It is a structural schematic diagram of a three-stage light-shielding exhaust ring in an embodiment of a high vacuum light-shielding scintillator imaging sealing structure of the present invention;

[0043] Figure 7 It is a structural schematic diagram of a beryllium window pinhole imaging structure in an embodiment of a high vacuum light-shielding scintillator imaging sealing structure of the present invention;

[0044] Figure 8 It is a structural schematic diagram of a support plate in an embodiment of a high vacuum light-shielding scintillator imaging sealing structure of the present invention;

[0045] Fig. 9 It is a structural schematic diagram of a pinhole pressing plate in an embodiment of a high vacuum light-shielding scintillator imaging sealing structure of the present invention;

[0046] Fig.10 It is a schematic diagram of the structure and optical path of a high vacuum light-shielding scintillator imaging sealing structure embodiment of the present invention, which is connected and cooperated with a magnetic confinement device.

[0047] Marks and corresponding parts names in the attached drawings:

[0048] Scintillator high vacuum cylinder 1, scintillator sealing flange 11, scintillator 12, device sealing flange 13, high vacuum cavity 14, exhaust port 15, beryllium window connecting flange 16, light-shielding exhaust multi-stage structure 2, light-shielding exhaust cylinder 21, first-level light-shielding exhaust ring 22, second-level light-shielding exhaust ring 23, third-level light-shielding exhaust ring 24, third-level exhaust hole 25, second-level exhaust hole 26, first-level exhaust hole 27, positioning screw hole 28, beryllium window pinhole imaging structure 3, pinhole pressure plate 31, beryllium window 32, support plate 33, plasma 4, magnetic confinement device window flange 5, magnetic confinement device main vacuum chamber 6, magnetic confinement device high vacuum exhaust port 7, soft X-ray optical path 8, stray light optical path 9. DETAILED DESCRIPTION

[0049] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0050] Example

[0051] like Figure 1 As shown, this embodiment provides a high vacuum light-shielding scintillator imaging sealing structure, including a scintillator high vacuum cylinder 1, a light-shielding exhaust multi-stage structure 2 and a beryllium window pinhole imaging structure 3;

[0052] Combination Figure 3 As shown, the light-shielding exhaust multi-stage structure 2 includes a light-shielding exhaust cylinder 21 and at least two light-shielding exhaust rings. Adjacent light-shielding exhaust rings are connected inside the light-shielding exhaust cylinder 21 at intervals. A plurality of circumferentially distributed positioning screw holes 28 are opened on the circumferential side surfaces of the light-shielding exhaust rings. The positioning screw holes 28 are arranged along the radial direction of the light-shielding exhaust rings. The light-shielding exhaust rings and the light-shielding exhaust cylinder 21 are tightly connected by inserting screws into the positioning screw holes 28. A plurality of circumferentially distributed exhaust holes are opened on the end face of the light-shielding exhaust ring. Both ends of the light-shielding exhaust cylinder 21 are interconnected. In this embodiment, a through hole is opened at the left end of the light-shielding exhaust cylinder 21, and the right end of the light-shielding exhaust cylinder 21 is an open end.

[0053] Combination Figure 1 As shown, one end of the scintillator high vacuum cylinder 1 passes through the light-shielding exhaust ring in sequence and is located in the light-shielding exhaust cylinder 21 and is connected to the light-shielding exhaust cylinder 21 and the beryllium window pinhole imaging structure 3; the light-shielding exhaust ring is connected to the light-shielding exhaust cylinder 21 and tightly surrounds the scintillator high vacuum cylinder 1, and a scintillator 12 is connected to the scintillator high vacuum cylinder 1 to seal it. An exhaust port 15 is opened on the scintillator high vacuum cylinder 1 at a position located in the light-shielding exhaust cylinder 21. In the present embodiment, six exhaust ports 15 are provided, and the six exhaust ports 15 are evenly distributed along the circumference of the scintillator high vacuum cylinder 1.

[0054] Specific: such as Figure 2 As shown, the scintillator high vacuum cylinder 1 is connected with a beryllium window connection flange 16, a device sealing flange 13 and a scintillator sealing flange 11, wherein the beryllium window connection flange 16 is located at the left end of the scintillator high vacuum cylinder 1 and close to the beryllium window pinhole imaging structure 3, and the beryllium window connection flange 16 is located in the light-shielding exhaust cylinder 21 and connected to the end of the beryllium window 32 vacuum imaging structure and the light-shielding exhaust multi-stage structure 2. The interior of the scintillator high vacuum cylinder 1 is hollow, and the internal cavity of the scintillator high vacuum cylinder 1 is a high vacuum cavity 14.

[0055] The sealing flange 13 of the device is located outside the light-shielding exhaust pipe 21, and is combined with Fig.10As shown, a high vacuum light-shielding scintillator imaging sealing structure in this embodiment is connected to a magnetic confinement device, and the device sealing flange 13 in this embodiment is connected to the magnetic confinement device window flange 5 on the magnetic confinement device, and the magnetic confinement device main vacuum chamber 6 in the magnetic confinement device is provided with a magnetic confinement device high vacuum exhaust port 7 at the upper and lower parts, and gas is injected into the magnetic confinement device main vacuum chamber 6 through an air supply pipeline, and plasma 4 is generated through an electric field; the scintillator 12 is connected to the scintillator sealing flange 11, and in this embodiment, the scintillator sealing flange 11 is placed outside the window of the magnetic confinement device, and one end of the scintillator 12 is welded to the scintillator sealing flange 11 and is located inside the scintillator high vacuum cylinder 1 and serves as the sealing surface of the scintillator high vacuum cylinder 1, thereby ensuring the sealing of the high vacuum cavity 14 of the scintillator high vacuum cylinder 1. The exhaust port 15 is the outlet for the retained gas to enter the light-shielding exhaust multi-stage structure.

[0056] Combination Figure 4 , Figure 5 and Figure 6 As shown, in the present embodiment, there are six exhaust holes on the light-shielding exhaust ring, and the six exhaust holes are evenly distributed in the circumference, and the exhaust holes on two adjacent light-shielding exhaust rings are staggered with each other. In the present embodiment, there are three light-shielding exhaust rings, and the three light-shielding exhaust rings are respectively a first-level light-shielding exhaust ring 22, a second-level light-shielding exhaust ring 23 and a third-level light-shielding exhaust ring 24. The first-level light-shielding exhaust ring 22, the second-level light-shielding exhaust ring 23 and the third-level light-shielding exhaust ring 24 are sequentially connected in the light-shielding exhaust tube 21 from the outside to the inside, that is, the first-level light-shielding exhaust ring 22, the second-level light-shielding exhaust ring 23 and the third-level light-shielding exhaust ring 24 are sequentially spaced inward from one end of the light-shielding exhaust tube 21 away from the beryllium window pinhole imaging structure 3, the exhaust hole on the first-level light-shielding exhaust ring 22 is a first-level exhaust hole 27, the exhaust hole on the second-level light-shielding exhaust ring 23 is a second-level exhaust hole 26, and the exhaust hole on the third-level light-shielding exhaust ring 24 is a third-level exhaust hole 25.

[0057] In this embodiment, one of the primary exhaust holes 27 on the primary light shielding exhaust ring 22 is offset from the central axis by 30 degrees, one of the secondary exhaust holes 26 on the secondary light shielding exhaust ring 23 is offset from the central axis by 60 degrees, and the tertiary exhaust holes 25 on the tertiary light shielding exhaust ring 24 are offset from the central axis by 90 degrees. In this way, the primary exhaust holes 27, the secondary exhaust holes 26 and the tertiary exhaust holes 25 are all offset by 30 degrees, so that the primary exhaust holes 27, the secondary exhaust holes 26 and the tertiary exhaust holes 25 are staggered with each other.

[0058] Combination Figure 1 As shown, the exhaust port 15 is located between the light-shielding exhaust ring close to the beryllium window pinhole imaging structure 3 and the beryllium window pinhole imaging structure 3 , that is, the exhaust port 15 is located on the left side of the three-stage light-shielding exhaust ring 24 .

[0059] Combination Figure 3As shown, on the exhaust path from the exhaust port 15 to the outside, the cavity volume between the light-shielding exhaust ring located at the innermost side of the light-shielding exhaust tube 21 and one end of the light-shielding exhaust tube 21 close to the beryllium window pinhole imaging structure 3 and the cavity volume formed between adjacent light-shielding exhaust rings decrease successively, that is, the cavity volume between the tertiary light-shielding exhaust ring 24 and the light-shielding exhaust tube 21, the cavity between the secondary light-shielding exhaust ring 23 and the tertiary light-shielding exhaust ring 24, and the cavity volume between the primary light-shielding exhaust ring 22 and the secondary light-shielding exhaust ring 23 decreases successively. Specifically: in this embodiment, the high vacuum cavity 14 of the scintillator high vacuum tube 1 where the exhaust port 15 is located and the cavity between the tertiary light-shielding exhaust ring 24 and the light-shielding exhaust tube 21, the cavity between the secondary light-shielding exhaust ring 23 and the tertiary light-shielding exhaust ring 24, and the cavity volume between the primary light-shielding exhaust ring 22 and the secondary light-shielding exhaust ring 23 are 6:3:2:1 in ratio. There is a relatively large pressure difference in each cavity, which can have a relatively strong acceleration effect on gas discharge.

[0060] like Figure 1 As shown, the exhaust port 15 and the exhaust hole on the light-shielding exhaust ring are arranged perpendicularly to each other. Figure 1 In the orientation shown, the exhaust port 15 is arranged perpendicular to the axial direction of the scintillator high vacuum cylinder 1, while the exhaust hole is arranged parallel to the axial direction of the scintillator high vacuum cylinder 1. In this way, it is difficult for the incident light entering from the exhaust hole on the light-shielding exhaust ring to enter the exhaust port 15, thereby effectively blocking the incident light from entering the high vacuum cavity 14 inside the scintillator high vacuum cylinder 1, thereby effectively avoiding interference with the scintillator 12.

[0061] like Figure 7 , Figure 8 and Fig. 9 As shown, the beryllium window pinhole imaging structure 3 includes a pinhole pressure plate 31, a support plate 33 and a beryllium window 32. A groove is provided at one end of the support plate 33. The thickness of the beryllium window 32 is 5um. Only X-rays can be emitted, and visible light and ultraviolet light are blocked.

[0062] In this embodiment, the support plate 33 is a circular plate structure, and a groove is opened in the center of the support plate 33. The beryllium window 32 is embedded in the groove. A connected pinhole is opened on the pinhole pressure plate 31 and the support plate 33. The pinhole is trumpet-shaped to expand the angle of the incident light and increase the flux of the incident light.

[0063] The pinhole pressing plate 31 is connected to the support plate 33, and the beryllium window 32 is located between the pinhole pressing plate 31 and the support plate 33. In this embodiment, two inner and outer circles of connecting holes are provided on the support plate 33. There are four connecting holes in the inner circle and the outer circle, and the four connecting holes are evenly distributed circumferentially. The pinhole pressing plate 31 is also provided with four connecting holes evenly distributed circumferentially. The four connecting holes on the pinhole pressing plate 31 correspond to the four connecting holes in the inner circle of the support plate 33, and are fastened by inserting screws, thereby limiting the beryllium window 32 and preventing the beryllium window 32 from falling.

[0064] Combination Figure 1 As shown, the left end of the light-shielding exhaust cylinder 21 is also provided with four circumferentially evenly distributed connection holes. When the scintillator high vacuum cylinder 1, the light-shielding exhaust multi-stage structure 2 and the beryllium window pinhole imaging structure 3 are connected to each other, the four connection holes located on the outer circle of the support plate 33 and the four connection holes at the left end of the light-shielding exhaust cylinder 21 are aligned with the beryllium window connecting flange 16 and are connected and fixed by screwing in screws.

[0065] In another embodiment, as shown in combination with FIG. 7 , there is a gap between the pinhole pressing plate 31 and the support plate 33. Specifically, a protrusion is connected to the side of the pinhole pressing plate 31 facing the beryllium window 32. The protrusion and the pinhole pressing plate 31 are integrally formed. The protrusion is arranged opposite to the beryllium window 32, and there is a gap of 1 mm between the protrusion and the support plate 33. In this way, when the pinhole pressing plate 31 and the support plate 33 are connected to each other, the beryllium window 32 embedded in the groove can have a buffer space, which can buffer the destructive force formed by the pressure difference between the inside and outside of the high vacuum chamber 14, and further enhance the protection of the beryllium window 32.

[0066] The specific implementation process is as follows:

[0067] Combination Fig.10 As shown, the light emitted by the plasma 4 in the main vacuum chamber 6 of the magnetic confinement device is filtered through the beryllium window pinhole imaging structure to complete the filtering of visible light and ultraviolet light, and its main optical path (i.e., the soft X-ray optical path 8) passes through the beryllium window pinhole imaging structure 3 to enter the high vacuum light-shielding scintillator imaging sealing structure, and passes through the scintillator high vacuum cylinder 1 to complete the transmission and conversion of the X-rays passing through the beryllium window 32, and the converted visible light is transmitted to the equipment outside the device for signal amplification and high-speed detection.

[0068] The visible light emitted by the plasma 4 is reflected multiple times on the inner wall of the magnetic confinement device to generate strong stray light. The stray light path will enter from the right side of the light-shielding exhaust multi-stage mechanism 2, and will be shielded by the light-shielding exhaust multi-stage structure 2 for multiple layers, effectively avoiding the interference of visible light on the imaging of the scintillator 12, greatly improving the contrast and clarity of the imaging of the scintillator 12. At the same time, when the vacuum chamber of the fusion device is inflated (the gas after the plasma discharge rupture or the gas added by the device wall treatment), the inflation gas entering the high vacuum cavity 14 of the scintillator high vacuum cylinder 1 can be discharged efficiently and quickly through the light-shielding exhaust multi-stage structure 2, and enter the operating exhaust system through the high vacuum exhaust port 7 of the magnetic confinement device.

[0069] The beryllium window pinhole imaging structure 3, because the beryllium window 32 is embedded in the groove, can withstand relatively high gas pressure during the gas exhaust process, and the incident light flux is increased due to the trumpet-shaped pinhole incident structure. The risk of vacuum leakage that may occur on the sealing surface of the scintillator 12 after long-term and multiple discharges can be effectively protected by the external scintillator sealing flange 11 (because the external scintillator sealing flange 11 will later be sealed and connected to other structures on the scintillator 12 located outside the scintillator high vacuum tube 1).

[0070] The visible light emitted by the plasma 4 and the stray light in the magnetic confinement device will first pass through the primary light-shielding exhaust ring 22, and most of the light will be reflected by the primary light-shielding exhaust ring 22, and a small part of the light will pass through the primary exhaust hole 27 and enter the cavity between the primary light-shielding exhaust ring 22 and the secondary light-shielding exhaust ring 23. Since the secondary exhaust hole 26 is rotated at an angle of 30 degrees relative to the primary exhaust hole 27, most of the light entering from the primary exhaust hole 27 is reflected by the secondary light-shielding exhaust ring 23, and the remaining small part of the light will pass through the secondary exhaust hole 26 and enter the cavity where the tertiary light-shielding exhaust ring 24 and the secondary exhaust ring 23 are located;

[0071] Since the tertiary exhaust hole 25 is rotated at an angle of 30 degrees relative to the secondary exhaust hole 26, most of the light entering from the secondary exhaust hole 26 is reflected by the tertiary light-shielding exhaust ring 24, and very little light enters the cavity on the left side of the tertiary light-shielding exhaust ring 24 through the tertiary exhaust hole 25, and then enters the high vacuum cavity 14 through the six exhaust ports 15 evenly distributed circumferentially on the scintillator high vacuum cylinder 1;

[0072] Since the exhaust port 15 has a vertical angle of 90 degrees with respect to the third-stage exhaust hole 25 , only extremely weak light enters the high vacuum cavity 14 , which basically does not affect the scintillator 12 .

[0073] At the same time, the gas entering the fusion device during the inflation process will instantly diffuse through the first-level exhaust hole 27, the second-level exhaust hole 26, the third-level exhaust hole 25, and the exhaust port 15 and remain in the corresponding cavity step by step. After 1-10 minutes or 1-2 hours, the gas in the main vacuum chamber 6 of the magnetic confinement device and the high vacuum cavity 14 will be extracted through the external exhaust system.

[0074] Due to the light-shielding exhaust multi-stage structure 2, the retained gas will be quickly discharged in the reverse direction through the exhaust port 15, the third-level exhaust hole 25, the second-level exhaust hole 26, and the first-level exhaust hole 27. Since the volume ratio of the cavity where the exhaust port 15, the third-level exhaust hole 25, the second-level exhaust hole 26, and the first-level exhaust hole 27 are located is approximately 6:3:2:1, there is a relatively large pressure difference in each cavity, which can have a relatively strong acceleration effect on the gas discharge. The multi-stage exhaust ring structure in the present invention can complete the multi-layer reflection shielding of visible light, and at the same time realize the efficient and rapid discharge of the retained gas in the cavity.

[0075] The visible light, ultraviolet light and X-rays emitted by the plasma 4 pass through the trumpet-shaped pinhole platen 31 and are incident on the beryllium window 32 with a 1mm gap between the trumpet-shaped pinhole platen 31 and the support plate 33. The thickness of the beryllium window 32 is 5um, and only X-rays can be emitted, while visible light and ultraviolet light are blocked. Due to the use of the trumpet-shaped pinhole, the angle of the incident light is expanded and the flux of the incident light is increased. When the device is evacuated, the beryllium window 32 embedded in the groove can buffer the destructive force formed by the pressure difference between the inside and outside of the high vacuum chamber 14 due to the gap between the pinhole platen 31 and the support plate 33.

[0076] The X-rays emitted through the beryllium window 32 enter the high vacuum cavity 14 connected by the beryllium window connection flange 16 and the support plate 33, and finally reach the scintillator 12 to be converted into visible light, and then emitted to the equipment outside the vacuum chamber. Among them, the device sealing flange 13 is docked with the magnetic confinement device window flange 5, the scintillator sealing flange 11 fixes the scintillator 12, the scintillator 12 is the sealing surface of the high vacuum cavity 14 of the scintillator 12, and the exhaust port 15 is the outlet for the retained gas to enter the light-shielding exhaust multi-stage structure 2. By adopting a suitable coating thickness, the scintillator 12 can only convert soft X-ray radiation into visible light, and does not respond to higher energy hard X-rays. To complete the conversion imaging of soft X-rays to visible light, the scintillator sealing flange 11 is placed outside the device sealing flange 13, which is conducive to the effective protection of the sealing surface of the scintillator 12.

[0077] It should be noted that the above description of the disclosed embodiments enables professionals and technicians in the field to implement or use the present application. Various modifications to these embodiments will be apparent to professionals and technicians in the field, and the general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

[0078] In the description of the present invention, it should be noted that the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0079] In the description of this document, terms such as "up", "down", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only used to illustrate the relative positional relationships between the various components or components, and do not particularly limit the specific installation orientations of the various components or components.

[0080] In the description of this document, some terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances.

[0081] In the description of this document, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0082] The structures, proportions, sizes, etc. drawn in the drawings in this application are only used to match the contents disclosed in this technical briefing book for technical personnel in this field to understand and read, and are not used to limit the restrictive conditions for the implementation of this application. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0083] The terms used in this document are those common terms currently widely used in the art in consideration of the functions of the present disclosure, but these terms may vary according to the intention of a person of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present disclosure. Therefore, the terms used in the document should not be understood as simple names, but rather as an overall description based on the meaning of the terms and the present disclosure.

[0084] Flowcharts or text are used in this document to illustrate the operating steps performed according to the embodiments of the present application. It should be understood that the operating steps in the embodiments of the present application are not necessarily accurately performed in the order of recording. On the contrary, various steps can be processed in reverse order or simultaneously as needed. At the same time, other operations can also be added to these processes, or a certain step or several steps can be removed from these processes.

[0085] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A high vacuum light-shielding scintillator imaging sealing structure, characterized in that: It includes a scintillator high vacuum cylinder, a light shielding exhaust multi-stage structure and a beryllium window pinhole imaging structure; The light-shielding exhaust multi-stage structure comprises a light-shielding exhaust cylinder and at least two light-shielding exhaust rings, wherein adjacent light-shielding exhaust rings are connected inside the light-shielding exhaust cylinder at intervals, and a plurality of circumferentially distributed exhaust holes are provided on the end faces of the light-shielding exhaust rings, and the two ends of the light-shielding exhaust cylinder are interconnected; One end of the scintillator high vacuum cylinder passes through the light-shielding exhaust ring in sequence and is located inside the light-shielding exhaust cylinder and is connected to the light-shielding exhaust cylinder and the beryllium window pinhole imaging structure; a scintillator is connected inside the scintillator high vacuum cylinder to seal it, and an exhaust port is opened on the scintillator high vacuum cylinder at a position inside the light-shielding exhaust cylinder.

2. A high vacuum light-shielding scintillator imaging sealing structure according to claim 1, characterized in that: The exhaust holes on two adjacent light-shielding exhaust rings are arranged alternately.

3. A high vacuum light-shielding scintillator imaging sealing structure according to claim 2, characterized in that: There are three light-shielding exhaust rings, which are a primary light-shielding exhaust ring, a secondary light-shielding exhaust ring and a tertiary light-shielding exhaust ring. The primary light-shielding exhaust ring, the secondary light-shielding exhaust ring and the tertiary light-shielding exhaust ring are sequentially connected in the light-shielding exhaust tube from the outside to the inside.

4. A high vacuum light-shielding scintillator imaging sealing structure according to any one of claims 1 to 3, characterized in that: The exhaust port is located between a light-shielding exhaust ring close to the beryllium window pinhole imaging structure and the beryllium window pinhole imaging structure.

5. A high vacuum light-shielding scintillator imaging sealing structure according to claim 4, characterized in that: On the exhaust path from the exhaust port to the outside, the cavity volume between the light-shielding exhaust ring located at the innermost side of the light-shielding exhaust tube and one end of the light-shielding exhaust tube close to the beryllium window pinhole imaging structure and the cavity volume formed between adjacent light-shielding exhaust rings decrease successively.

6. A high vacuum light-shielding scintillator imaging sealing structure according to any one of claims 1 to 3, characterized in that: The exhaust port and the exhaust hole on the light-shielding exhaust ring are arranged with axes perpendicular to each other.

7. A high vacuum light-shielding scintillator imaging sealing structure according to any one of claims 1 to 3, characterized in that: The beryllium window pinhole imaging structure includes a pinhole pressure plate, a support plate and a beryllium window. A groove is provided at one end of the support plate, and the beryllium window is embedded in the groove. A communicating pinhole is provided on the pinhole pressure plate and the support plate. The pinhole pressure plate and the support plate are connected to each other, and the beryllium window is located between the pinhole pressure plate and the support plate.

8. A high vacuum light-shielding scintillator imaging sealing structure according to claim 7, characterized in that: The pinhole is trumpet-shaped.

9. The high vacuum light-shielding scintillator imaging sealing structure according to claim 7, characterized in that: There is a gap between the pinhole pressing plate and the supporting plate.

10. A high vacuum light-shielding scintillator imaging sealing structure according to any one of claims 1 to 3, characterized in that: The scintillator high vacuum cylinder is connected with a beryllium window connecting flange, a device sealing flange and a scintillator sealing flange; the beryllium window connecting flange is connected to the ends of the beryllium window vacuum imaging structure and the light-shielding exhaust multi-stage structure; the scintillator is connected to the scintillator sealing flange.

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