Image relay optical system for fast ion loss probe

Abstract

The application discloses an image transmission optical system for a fast ion loss probe, which comprises a special probe shaft, a periscope lens group, a fiber image transmission bundle, a relay lens and an image acquisition device, the periscope lens group is installed inside the special probe shaft of the fast ion loss probe, a fast ion loss probe probe head is bolted to the front end of the special probe shaft, the rear end of the special probe shaft is isolated from the external environment through a vacuum observation window, the vacuum observation window is externally connected with the fiber image transmission bundle, and the rear end of the fiber image transmission bundle is connected with the image acquisition device through the relay lens. The periscope lens group is combined with the fiber image transmission bundle, the periscope lens group is specially designed for the fast ion loss probe system, and the fluorescent pattern in the fast ion loss probe probe head can be completely imaged on the front end surface of the fiber image transmission bundle. The image on the rear end surface of the fiber image transmission bundle can be imaged on the photosensitive surface of the image acquisition device through the relay lens, so that the image data acquisition is completed.

Description

Technical Field

[0001] This invention relates to the field of magnetic confinement fusion plasma diagnostics, and more particularly to an image transfer optical system for fast ion loss probes. Background Technology

[0002] A fast ion loss probe based on a scintillator is a type of probe used in magnetic confinement fusion plasma experimental devices to detect high-energy ions lost from the plasma. It typically includes basic components such as an ultra-high vacuum gate valve, a bellows, a vacuum observation window, a drive motor, a probe, and a probe shaft. The front end of the probe shaft passes through the ultra-high vacuum gate valve and extends deep into the magnetic confinement fusion device. The probe is mounted at the front end of the probe shaft, and a bellows is nested around the probe shaft. A vacuum observation window is installed at the rear end of the bellows. The bellows and the vacuum observation window together maintain the vacuum environment inside the magnetic confinement fusion device, isolating the probe and probe shaft within the vacuum environment. The drive motor drives the probe and probe shaft to move back and forth, thereby controlling the depth of the probe entering the magnetic confinement fusion device. The bellows provides the extension and retraction for the precession of the probe and probe shaft. The probe mainly consists of a collimator and a scintillator sheet. When high-energy ions escape to the edge of the plasma without confinement, they are first screened by the collimator. Ions that pass through the collimator undergo Larmor cyclotron motion under the strong magnetic field of the magnetic confinement device and eventually collide with a certain position on the scintillator sheet, emitting fluorescence. Since ions with different energies and throw angles collide at different positions, researchers can deduce the energy and throw angle of the lost ions based on the position of the fluorescence emitted on the scintillator sheet, and thus deduce the trajectory of the lost ions, helping to study the loss mechanism of high-energy ions.

[0003] For image transmission systems that transmit fluorescence patterns from a scintillator to data acquisition devices, the common practice in major magnetic confinement fusion devices is to use commercial lenses to capture fluorescence patterns from a distance and then image these patterns onto the optical sensors of a high-speed camera or photomultiplier tube array.

[0004] The current problems with image transmission systems are:

[0005] 1. Data acquisition equipment is susceptible to interference. Traditional image transmission system solutions require data acquisition equipment to be located near the magnetic confinement fusion device. However, the strong magnetic field and intense neutron and X-ray radiation near the magnetic confinement fusion device can interfere with or even damage the data acquisition equipment used to acquire and analyze scintillation light signals in the probe, such as high-speed cameras and photomultiplier tube arrays.

[0006] 2. The optical path cannot be pre-adjusted in the laboratory. Commercial lenses do not have the conditions to work in the ultra-high vacuum environment inside the magnetic confinement fusion device. Therefore, they can only take pictures of the fluorescence pattern on the scintillator outside the vacuum observation window. The lens cannot be fixed to the probe of the fast ion loss probe. Therefore, it is not possible to pre-adjust the optical path in the laboratory and then move and install the whole device onto the fusion device.

[0007] 3. When adjusting the optical path on the fusion device, there is a lack of a reference light source. After the fast ion loss probe is installed, there is no light source inside the fusion device to illuminate the scintillator before plasma discharge experiments are conducted, making optical path adjustment impossible. During plasma discharge experiments, the scintillator may be illuminated, but personnel cannot approach the fusion device, so optical path adjustment is still impossible. Only approximate adjustments can be made after each experiment based on the footage from the previous experiment.

[0008] 4. Commercial lenses often need to balance the imaging effect across various wavelengths in the visible light band, and are not specifically optimized for the emission wavelength of the scintillator, resulting in poor imaging performance. Summary of the Invention

[0009] The purpose of this invention is to address the shortcomings of existing technologies by proposing an image transfer optical system for fast ion loss probes.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] An image transmission optical system for a fast ion loss probe includes an optical fiber image bundle, a relay lens, an image acquisition device, a specially designed probe shaft, and a periscope lens group. The front end of the specially designed probe shaft passes through an ultra-high vacuum gate valve and a bellows and extends into the interior of a magnetic confinement fusion device. A fast ion loss probe is bolted to the front end of the specially designed probe shaft. A vacuum observation window is installed at the rear end of the specially designed probe shaft. The end of the vacuum observation window is connected to the optical fiber image bundle. The rear end of the optical fiber image bundle is connected to the data acquisition device through a relay lens. A lens group is disposed inside the specially designed probe shaft.

[0012] Preferably, the optical fiber image transmission bundle is a flexible optical fiber bundle, the length of which can be customized according to actual conditions.

[0013] Preferably, the lens group consists of multiple lenses arranged in parallel and staggered order, specifically including lens one, lens two, lens three, lens four, lens five, and lens six.

[0014] Preferably, the inner side of the specially designed probe shaft is provided with four limiting guide rails arranged in a circular array, the outer side of the lens is provided with a lens frame, and the outer side of the lens frame is provided with four limiting grooves arranged in a circular array, the four limiting grooves matching the four limiting guide rails.

[0015] Preferably, the outer wall of the specially designed probe shaft is provided with a fixing groove at each of the two symmetrically arranged limiting guides, and a fixing screw is installed in each of the two symmetrical limiting grooves on the lens frame. The fixing screw mounting part passes through the inner opening of the fixing groove, and the head of the fixing screw abuts against the inner side of the fixing groove.

[0016] Preferably, a bellows is sleeved on the outside of the specially designed probe shaft, and an active slider is installed on the outside of the specially designed probe shaft at the rear end of the bellows. The bottom end of the active slider is slidably connected to the guide rail, and a drive motor is installed at the rear end of the guide rail. One end of the output shaft of the drive motor is fixedly connected to a lead screw, and the active slider is installed on the outside of the lead screw. The active slider is driven to slide along the direction of the guide rail by the rotation of the lead screw. The bellows has extensibility, and its two ends are sealed.

[0017] Preferably, the radii of curvature of the optical surfaces of each lens in the lens group 11 are as follows:

[0018] Lens side 1: -110.7mm;

[0019] Lens dimensions 2: 127.4mm;

[0020] Lens surface 1: -321.2mm;

[0021] Lens surface 2: -216.8mm;

[0022] Lens three-sided 1: -1780.8mm;

[0023] Lens three-sided 2: -444.2mm;

[0024] Lens four-sided 1: -117.7mm;

[0025] Lens four-sided 2: -119.9mm;

[0026] The lens has five facets, with a diameter of 1:313.5mm.

[0027] Lens with five facets, 2: -1767.8mm;

[0028] Lens six-sided 1: -86.6mm;

[0029] Lens six-sided 2: -88.8mm;

[0030] The distance between the optical surfaces of each lens is as follows: object plane to lens surface 1: 300 mm;

[0031] Lens surface 1 - Lens surface 2 (111): 10mm;

[0032] Lens 1 surface 2 - Lens 2 (112) surface 1: 300mm; Lens 2 surface 1 - Lens 2 (112) surface 2: 9.8mm; Lens 2 surface 2 - Lens 3 (113) surface 1: 56.7mm; Lens 3 surface 1 - Lens 3 (113) surface 2: 3.5mm; Lens 3 surface 2 - Lens 4 (114) surface 1: 151.5mm; Lens 4 surface 1 - Lens 4 (114) surface 2: 3.3mm; Lens 4 surface 2 - Lens 5 (115) surface 1: 233mm; Lens 5 surface 1 - Lens 5 (115) surface 2: 5mm;

[0033] Lens 5-face 2 - Lens 6 (116)-face 1: 78.3mm; Lens 6-face 1 - Lens 6 (116)-face 2: 3mm;

[0034] Lens six-faceted 2-image plane: 295.8mm;

[0035] The materials of each lens in the lens group (11) are as follows:

[0036] Lens 1: SF2

[0037] Lens 2: BASF51

[0038] Lens 3: N-SF4

[0039] Lens 4: N-SF4

[0040] Lens 5: BASF 51

[0041] Lens 6: SF2.

[0042] Compared with the prior art, the beneficial effects of the present invention are:

[0043] 1. To address the issue of data acquisition equipment being susceptible to interference, this invention employs an optical fiber image bundle solution. Essentially, the optical fiber image bundle is a tightly bundled set of optical fibers. The fiber positions on both ends of the image bundle correspond one-to-one. Each end of the image bundle acts as a display screen, and each fiber in the bundle is equivalent to a pixel on that screen. Therefore, the image on one end of the image bundle will be completely transmitted to the other end. Furthermore, the flexibility of the optical fiber image bundle ensures the flexibility of the placement of the fast ion loss probe data acquisition equipment. Thus, the data acquisition equipment can be placed in a diagnostic data acquisition hall tens of meters away from the magnetic confinement fusion device to avoid magnetic field and radiation interference.

[0044] 2. To address the problem of not being able to pre-adjust the imaging optical path in the laboratory, this invention employs a lens assembly placed within a specially designed probe shaft to extract light signals from the scintillator. The inner wall of the specially designed probe shaft has raised guide rails along its direction, matching the concave guide rails on the lens frame. Therefore, the lens can slide freely within the specially designed probe shaft. Additionally, the specially designed probe shaft has two strip-shaped slots along its direction, corresponding to screw holes on the lens frame. After the lens is adjusted to the appropriate position, its position can be fixed with screws. Simultaneously, the strip-shaped slots connect the spaces between the lenses within the specially designed probe shaft with the external space of the shaft, preventing vacuum "dead zones" between the lenses during vacuuming of the magnetic confinement fusion device, which could even pose a threat to the vacuum level of the fusion device. As described above, by installing the lens assembly within the specially designed probe shaft, the fast ion loss probe and each lens are fixed to the specially designed probe shaft. Furthermore, during plasma experiments in the fusion device, both the probe and the lens assembly are located in the vacuum environment of the fusion device. Therefore, this optical path can be pre-adjusted in the laboratory before being installed as a whole onto the fusion device.

[0045] 3. Regarding the light source issue during optical path adjustment, when the optical path is pre-adjusted in the laboratory, artificial light can be applied to the probe to assist in the adjustment;

[0046] 4. Commercial lenses do not specifically optimize for the emission wavelength of the scintillator. In this invention, the surface curvature of the lens group and the relative position of the lenses have been optimized by optical simulation software to ensure the best imaging capability of the optical path at the emission wavelength of the scintillator. Attached Figure Description

[0047] To illustrate the technical solutions in the embodiments of the present invention or the prior art more specifically and intuitively, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0048] Figure 1 This is a schematic diagram of the fast ion loss probe proposed in this invention;

[0049] Figure 2 This is a front view of the image transmission optical system proposed in this invention;

[0050] Figure 3 This is a perspective view of the image transmission optical system proposed in this invention;

[0051] Figure 4 This is a front view of the imaging portion of the image transmission optical system proposed in this invention;

[0052] Figure 5 This is a perspective view of the imaging portion of the image transmission optical system proposed in this invention.

[0053] Figure 6This is a cross-sectional view of the imaging portion of the image transmission optical system proposed in this invention;

[0054] Figure 7 This is a schematic diagram of the lens six structure proposed in this invention;

[0055] Figure 8 This is a simulation diagram of ray tracing for the lens group proposed in this invention;

[0056] Figure 9 This is a simulation diagram of the image sharpness of the lens group proposed in this invention;

[0057] Figure 10 This is a simulated image of the lens composition proposed in this invention.

[0058] In the diagram: 1. Magnetic confinement fusion device; 2. Ultra-high vacuum gate valve; 3. Bellows; 4. Vacuum observation window; 5. Fiber optic image bundle; 6. Relay lens; 7. Data acquisition equipment; 8. Drive motor; 9. Fast ion loss probe; 10. Special probe shaft; 101. Fixing groove; 102. Limiting guide rail; 111. Lens 1; 112. Lens 2; 113. Lens 3; 114. Lens 4; 115. Lens 5; 116. Lens 6; 117. Lens frame; 118. Limiting groove; 119. Fixing screw. Detailed Implementation

[0059] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0060] Reference Figure 1-10 An image transmission optical system for a fast ion loss probe includes an optical fiber image bundle 5, a relay lens 6, an image acquisition device 7, a specially designed probe shaft 10, and a periscope lens group 11. An ultra-high vacuum gate valve 2 is connected to a magnetic confinement fusion device 1 via a vacuum pipe. The front end of the specially designed probe shaft 10 passes through the ultra-high vacuum gate valve 2 and a bellows 3 and extends into the interior of the magnetic confinement fusion device 1. A fast ion loss probe 9 is bolted to the front end of the specially designed probe shaft 10. A vacuum observation window 4 is installed at the rear end of the specially designed probe shaft 10. The end of the vacuum observation window 4 is connected to the optical fiber image bundle 5. The rear end of the optical fiber image bundle 5 is connected to the data acquisition device 7 via the relay lens 6. The periscope lens group 11 is disposed inside the specially designed probe shaft 10.

[0061] In the above-mentioned technical solution, the specially designed probe shaft 10 and the periscope lens group 11 are in the same vacuum environment as the magnetic confinement fusion device 1. When the magnetic confinement fusion device 1 is conducting experiments, the light signal in the fast ion loss probe 9 can be transmitted through the lens group 11 and pass through the window glass in the vacuum observation window 4 to reach the front end of the fiber optic image bundle 5. In this way, the fluorescence image on the scintillator screen in the fast ion loss probe 9 can be imaged on this end face. Since the positions of the optical fibers on both ends of the fiber optic image bundle 5 correspond one-to-one, the image on its front end face can be transmitted to the rear end face. The image on the rear end face is then imaged on the sensor of the image data acquisition device 7 by the relay lens 6. Finally, the fluorescence image on the scintillator screen in the fast ion loss probe 9 is transmitted to the sensor of the image data acquisition device 7 and is collected and recorded.

[0062] Fiber optic image bundle 5 is a flexible fiber optic bundle;

[0063] The above-mentioned technical solutions allow for flexible adjustment of the position of the image data acquisition device 7 due to the flexibility of the fiber optic image bundle 5. It does not need to be fixed on the straight extension line of the optical path, and the length of the fiber optic image bundle 5 can also be customized according to the placement distance of the image data acquisition device 7.

[0064] The lens group 11 consists of multiple lenses arranged in parallel and staggered order, specifically including lens one 111, lens two 112, lens three 113, lens four 114, lens five 115, and lens six 116.

[0065] The inner side of the specially designed probe shaft 10 is provided with four limiting guide rails 102 arranged in a ring array. The outer side of the lens is provided with a lens frame 117. The outer side of the lens frame 117 is provided with four limiting grooves 118 arranged in a ring array. The four limiting grooves 118 match the four limiting guide rails 102. The outer wall of the specially designed probe shaft 10 is provided with fixing grooves 101 at two of the symmetrically arranged limiting guide rails 102. Fixing screws 119 are installed in the two symmetrical limiting grooves 118 on the lens frame 117. The mounting part of the fixing screw 119 passes through the inner opening of the fixing groove 101, and the head of the fixing screw 119 abuts against the inner side of the fixing groove 101.

[0066] The above-mentioned technical solution has four lens limiting guide rails 102 inside the special probe shaft 10. Their shape and size match the limiting grooves 118 on the lens frame 117. Therefore, the position of each lens in the lens group 11 inside the special probe shaft 10 can be freely adjusted and will not be jammed. Lens fixing grooves 101 are machined on the upper and lower sides of the special probe shaft 10. The positions of the two grooves correspond to the positions of the lens fixing screws 119 installed on the lens frame 117. The width of the outer opening of the fixing groove 101 is greater than the width of its inner opening. Therefore, the inner opening can allow the rod of the fixing screw 119 to pass through, but the head cannot pass through. When the lens is adjusted to a suitable position, the position of the lens inside the special probe shaft 10 can be fixed by tightening the lens fixing screws 119.

[0067] A bellows 3 is sleeved on the outside of the special probe shaft 10, and an active slider is installed on the outside of the special probe shaft 10 at the rear end of the bellows 3. The bottom end of the active slider is slidably connected to the guide rail. A drive motor 8 is installed at the rear end of the guide rail. One end of the output shaft of the drive motor 8 is fixedly connected to a lead screw, and the active slider is installed on the outside of the lead screw. The lead screw rotates and drives it to slide along the direction of the guide rail. The bellows 3 has extensibility and its two ends are sealed.

[0068] The optical parameters of lens group 11 are designed specifically for the emission wavelength (450nm) of the scintillator ZnS:Ag used in the fast ion loss probe. The radii of curvature of the optical surfaces of each lens are shown below (the direction from the object plane to the image plane is the negative direction):

[0069] Lens 111 surface 1: -110.7mm;

[0070] Lens 2, plane 111, 2: 127.4mm;

[0071] Lens 2, surface 112: -321.2mm;

[0072] Lens 2, plane 112: -216.8mm;

[0073] Lens 3, Surface 1 (113): -1780.8mm;

[0074] Lens 3, plane 113, 2: -444.2mm;

[0075] Lens 4, 114 facets, 1: -117.7mm;

[0076] Lens 4, 114 facets 2: -119.9mm;

[0077] Lens 5, 115 plane, 1: 313.5mm;

[0078] Lens 5, 115 plane 2: -1767.8mm;

[0079] Lens 6, 116 facet 1: -86.6mm;

[0080] Lens 6, 116 facets 2: -88.8mm;

[0081] The distances between the optical surfaces of each lens are shown below:

[0082] Object plane - Lens 111 plane 1: 300mm;

[0083] Lens 111 Surface 1 - Lens 111 Surface 2: 10mm;

[0084] Lens 1 (surface 111) - Lens 2 (surface 112) = 300mm;

[0085] Lens 2, plane 1-2 (112-112): 9.8mm;

[0086] Lens 2, plane 112 (2) - Lens 3, plane 113 (1): 56.7mm;

[0087] Lens 3, plane 1-2: 3.5mm;

[0088] Lens 3, plane 113, 2 - Lens 4, plane 114, 1: 151.5mm;

[0089] Lens 4, plane 1-2: 3.3mm;

[0090] Lens 4, plane 114, 2 - Lens 5, plane 115, 1: 233mm;

[0091] Lens 5 115 surface 1 - Lens 5 115 surface 2: 5mm;

[0092] Lens 5, plane 115, 2 - Lens 6, plane 116, 1: 78.3mm;

[0093] Lens 6 116 surface 1 - Lens 6 116 surface 2: 3mm;

[0094] Lens 6, plane 116, image plane 2: 295.8mm;

[0095] The materials of each lens in lens group 11 are as follows:

[0096] Lens 111: SF2

[0097] Lens 2 112: BASF51

[0098] Lens 313: N-SF4

[0099] Lens 4 114: N-SF4

[0100] Lens 5115: BASF51

[0101] Lens 6116: SF2.

[0102] Working principle:

[0103] Specifically, before conducting experiments on the magnetic confinement fusion device 1, the fast ion loss probe 9, the special probe shaft 10, and the lens group 11 can be assembled and the optical path pre-adjusted in a laboratory environment. First, the fast ion loss probe 9 is installed on the front end of the special probe shaft 10 using screws. Then, the six lenses of the lens group 11 are sequentially installed into the special probe shaft 10. There are four lens limiting guide rails 102 inside the special probe shaft 10. Their shape and size match the limiting grooves 118 on the lens frame 117. Therefore, the position of each lens in the lens group 11 inside the special probe shaft 10 can be freely adjusted and will not be jammed. Lens fixing grooves 101 are machined on the upper and lower sides of the special probe shaft 10. The positions of the two grooves correspond to the positions of the fixing screws 119 installed on the lens frame 117. Therefore, when the lens is adjusted to the appropriate position, the position of the lens inside the special probe shaft 10 can be fixed by tightening the lens fixing screws 119. In this way, the position of the lens assembly 11 inside the special probe shaft 10 can be adjusted manually by moving the lens fixing screw 119 outside the special probe shaft 10, and the position of the lens assembly 11 can be fixed by tightening the lens fixing screw 119. When adjusting the position of the lens assembly 11 inside the special probe shaft 10, the actual installation position of the fiber optic image bundle 5 during the magnetic confinement fusion device 1 experiment should be considered, and the image plane or image bundle should be placed at the corresponding position during laboratory adjustment to observe the imaging effect. Since the adjustment of the lens assembly 11 can be carried out in a laboratory environment, an external illumination source can be used to illuminate the scintillator screen in the fast ion loss probe 9 through the small hole to provide a reference for optical path adjustment. After the position of the lens assembly 11 inside the special probe shaft 10 is adjusted and fixed, the fast ion loss probe 9, the special probe shaft 10, and the lens assembly 11 can be installed as a whole onto the corrugated... Inside tube 3, during experiments in the magnetic confinement fusion device 1, the optical signal from the fast ion loss probe 9 is transmitted through the lens group 11 and passes through the window glass in the vacuum observation window 4 to reach the front end of the fiber optic image bundle 5. Thus, the fluorescence image on the scintillator screen of the fast ion loss probe 9 can be imaged on this end face. Since the positions of the optical fibers on both ends of the fiber optic image bundle 5 correspond one-to-one, the image on its front end face can be transmitted to the rear end face. The image on the rear end face is then imaged onto the sensor of the image data acquisition device 7 via the relay lens 6. Finally, the fluorescence image on the scintillator screen of the fast ion loss probe 9 is transmitted to the sensor of the image data acquisition device 7. Furthermore, due to the flexible characteristics of the fiber optic image bundle 5, the position of the image data acquisition device 7 can be flexibly adjusted and does not need to be fixed on the straight extension line of the optical path. The length of the fiber optic image bundle 5 can also be customized according to the placement distance of the image data acquisition device 7.

[0104] The ray tracing simulation results of lens group 11 are as follows: Figure 8 As shown, the light emitted from the scintillator screen is refracted by lens group 11 and reaches the end face of the fiber optic image bundle 5. The simulated image sharpness results are as follows: Figure 9 As shown, for the four point light sources on the scintillator screen at distances of 0mm, 9mm, 12.5mm, and 18mm from the center point, the images formed on the end face of the fiber optic image bundle 5 are finite-sized light spots, all with diameters less than 4 micrometers, smaller than the diameter of a single fiber filament of the fiber optic image bundle 5 (16 micrometers). Therefore, the imaging sharpness of the lens group 11 is sufficiently high, and the spatial resolution of the fiber optic image bundle 5 can be fully utilized. The image simulation results of the lens group 11 are as follows: Figure 10 As shown, assuming the image on the scintillator screen is a grid as shown in the left figure, the image on the end face of the fiber optic image bundle 5 obtained after tracing 1 billion optical fibers is shown in the right figure. The shape is exactly the same as the image in the left figure, and there is no distortion visible to the naked eye. This proves that the lens group 11 can clearly transmit the fluorescence image on the scintillator screen in the fast ion loss probe 9 to the end face of the fiber optic image bundle 5.

[0105] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An image transmission optical system for a fast ion loss probe, comprising an optical fiber image bundle (5), a relay lens (6), an image data acquisition device (7), a special probe shaft (10), and a periscope lens group (11), wherein the front end of the special probe shaft (10) passes through an ultra-high vacuum insert valve (2) and a bellows (3) and extends into the interior of a magnetic confinement fusion device (1), and a fast ion loss probe probe (9) is bolted to the front end of the special probe shaft (10), and a vacuum observation window (4) is installed at the rear end of the special probe shaft (10). The image transmission optical system is characterized in that the periscope lens group (11) is installed inside the special probe shaft (10), and the optical fiber image bundle (5) is connected to the outside of the vacuum observation window (4), and the rear end of the optical fiber image bundle (5) is connected to the image data acquisition device (7) through the relay lens (6). The lens group (11) consists of multiple lenses arranged in parallel and staggered order, specifically including lens one (111), lens two (112), lens three (113), lens four (114), lens five (115) and lens six (116). The inner side of the specially designed probe shaft (10) is provided with four limiting guide rails (102) arranged in a ring array. The outer side of the lens is provided with a lens frame (117). The outer side of the lens frame (117) is provided with four limiting grooves (118) arranged in a ring array. The four limiting grooves (118) match the four limiting guide rails (102).

2. The image transfer optical system for a fast ion loss probe according to claim 1, characterized in that, The optical fiber image bundle (5) is a flexible optical fiber bundle.

3. The image transfer optical system for a fast ion loss probe according to claim 1, characterized in that, The outer wall of the special probe shaft (10) is provided with a fixing groove (101) corresponding to the two symmetrically arranged limiting guides (102). The two symmetrical limiting grooves (118) on the lens frame (117) are each equipped with a fixing screw (119). The mounting part of the fixing screw (119) passes through the inner opening of the fixing groove (101), and the head of the fixing screw (119) abuts against the inner side of the fixing groove (101).

4. The image transfer optical system for a fast ion loss probe according to claim 1, characterized in that, The radii of curvature of the optical surfaces of each lens in the lens group 11 are shown below: Lens 1 (111) surface 1: -110.7mm; Lens 1 (111) plane 2: 127.4mm; Lens 2 (112) plane 1: -321.2mm; Lens 2 (112) plane 2: -216.8mm; Lens 3 (113) plane 1: -1780.8mm; Lens 3 (113) plane 2: -444.2mm; Lens 4 (114) plane 1: -117.7mm; Lens 4 (114) plane 2: -119.9mm; Lens 5 (115) plane 1: 313.5mm; Lens 5 (115) plane 2: -1767.8mm; Lens 6 (116) plane 1: -86.6mm; Lens 6 (116) plane 2: -88.8mm; The distances between the optical surfaces of each lens are shown below: Object plane - Lens 1 (111) plane 1: 300mm; Lens 1 (111) surface 1 - Lens 1 (111) surface 2: 10mm; Lens 1 (111) plane 2 - Lens 2 (112) plane 1: 300mm; Lens 2 (112) plane 1 - Lens 2 (112) plane 2: 9.8mm; Lens 2 (112) plane 2 - Lens 3 (113) plane 1: 56.7mm; Lens 3 (113) plane 1 - Lens 3 (113) plane 2: 3.5mm; Lens 3 (113) plane 2 - Lens 4 (114) plane 1: 151.5mm; Lens 4 (114) plane 1 - Lens 4 (114) plane 2: 3.3mm; Lens 4 (114) plane 2 - Lens 5 (115) plane 1: 233mm; Lens 5 (115) plane 1 - Lens 5 (115) plane 2: 5mm; Lens 5 (115) plane 2 - Lens 6 (116) plane 1: 78.3mm; Lens 6 (116) plane 1 - Lens 6 (116) plane 2: 3mm; Lens 6 (116) plane 2 - Image plane: 295.8mm; The materials of each lens in the lens group (11) are as follows: Lens 1 (111): SF2 Lens 2 (112): BASF51 Lens 3 (113): N-SF4 Lens 4 (114): N-SF4 Lens 5 (115): BASF 51 Lens 6 (116): SF2.

Images