An optical lens and a plasma temperature diagnostic system for a fusion device

Abstract

The present invention relates to the field of plasma diagnostic technologies, and specifically discloses an optical lens and a plasma temperature diagnostic system for a fusion device. Among them, the optical lens includes a first lens assembly, a mirror assembly, and a second lens assembly sequentially installed in the direction from the object plane to the image plane. The imaging area of the object plane in the current imaging of the image plane is a partial area of the object plane; the mirror assembly includes an adjusting device for adjusting the position of the mirror assembly to change the imaging of different areas in the object plane in the image plane. During the process of the adjusting device adjusting the position of the reflection assembly, scanning of different positions on the object plane is realized, so that different positions on the object plane are imaged on the image plane. It is realized that the acquisition range of the line emission spectrum signal of the plasma cross-section in the cavity of the controllable nuclear fusion device can be increased, effectively solving the problem of limited measurement space range of the conventional multi-channel Doppler spectroscopy diagnostic system, and realizing the measurement of large-range plasma parameters through a small-scale light-receiving and imaging optical system.

Description

Technical Field

[0001] The present invention relates to the technical field of plasma diagnosis, and particularly to an optical lens and a plasma temperature diagnosis system for a fusion device. Background Art

[0002] Ion temperature is one of the important parameters of high-temperature plasmas. Using the Doppler broadening of line emission spectra to infer the ion temperature of high-temperature plasmas is an important measurement technique at present. In the prior art, the light-receiving system for ion Doppler spectroscopy diagnosis usually needs to be arranged on the window of the cavity (i.e., the vacuum chamber) of a controlled nuclear fusion device, and then the light emitted by the plasma in the cavity is received and measured through an optical system.

[0003] The current ion Doppler spectroscopy diagnosis optical system is limited by the field of view range and the diagnostic window space, and can only achieve the measurement of fixed points or chords in the cavity of the controlled nuclear fusion device, obtaining plasma ion temperature parameters in a very small spatial range; for the experimental requirements of measuring the temperature of a certain range of plasma regions, currently, it can only be achieved by adding corresponding light-receiving and imaging optical system fixed points, which causes great limitations to the analysis of relevant physical quantities.

[0004] Therefore, how to use a small-scale diagnosis system to achieve the diagnosis of a large range of plasma temperatures has become an urgent technical problem to be solved. Summary of the Invention

[0005] In view of this, the present invention provides an optical lens and a plasma temperature diagnosis system for a fusion device to solve the technical problem of how to use a small-scale diagnosis system to achieve the diagnosis of a large range of plasma temperatures.

[0006] In a first aspect, the present invention provides an optical lens applicable to a plasma temperature diagnosis system of a fusion device, characterized in that the optical lens includes a first lens assembly, a mirror assembly, and a second lens assembly sequentially installed along the object plane to the image plane direction, and the imaging area of the object plane currently imaged on the image plane is a partial area of the object plane; the mirror assembly includes an adjusting device for adjusting the position of the mirror assembly to change the imaging of different regions of the object plane on the image plane.

[0007] In one embodiment, the adjusting device is used to change the position of the optical axis of symmetry in the mirror assembly so that different regions of the object plane are imaged on the image plane.

[0008] In one embodiment, the adjusting device includes a rotating motor, and the mirror in the mirror assembly is integrally fixedly installed on the rotating motor, and the mirror is driven by the rotating motor to rotate around the optical axis of the first lens assembly and / or the second lens assembly.

[0009] In one embodiment, the rotation angle of the rotation motor is greater than 0° and less than or equal to 360°.

[0010] In one embodiment, the adjusting device includes a swing motor for adjusting at least one mirror in the mirror assembly. By adjusting the angle of the corresponding mirror, the optical symmetry axis is translated along a direction perpendicular to the optical symmetry axis.

[0011] In one embodiment, the mirror assembly includes an odd number of mirrors, which are sequentially installed along the direction from the object plane to the image plane. Among them, the mirror close to the image plane side is fixed on the swing motor and can swing around the swing axis.

[0012] In one embodiment, the mirror assembly includes a first mirror, a second mirror, and a third mirror that are sequentially installed along the direction from the object plane to the image plane. Among them, the third mirror is fixed on the swing motor and can swing around the swing axis. When the swing angle of the swing axis is 0°, the angle between the first mirror and the XZ coordinate plane in the first direction of the Z axis is equal to the angle between the third mirror and the XZ coordinate plane in the second direction of the Z axis, and the first mirror and the third mirror are perpendicular to the YZ coordinate plane; the second mirror is perpendicular to the XY coordinate plane and parallel to the XZ coordinate plane. Among them, the first direction and the second direction are opposite, the angle is an acute angle, the Z axis is rotationally parallel to the optical axis of the first lens assembly and / or the second lens assembly, and the XY coordinate plane is parallel to the lens main plane in the first lens assembly and the second lens assembly.

[0013] In one embodiment, the reflecting surface of the first mirror is on the object plane side, the reflecting surface of the second mirror is the light incident surface, and the reflecting surface of the third mirror is on the image plane side.

[0014] In one embodiment, the first mirror is elliptical, the second mirror is elliptical, and the third mirror is rectangular.

[0015] In one embodiment, the minor axis of the first mirror is parallel to the minor axis of the second mirror and perpendicular to the YZ coordinate plane. The long side of the third mirror is parallel to the minor axis of the second mirror, and the swing axis passes through the straight line of the midpoints of the two short sides.

[0016] In one embodiment, the first lens assembly includes a first lens, a second lens, and a third lens. Among them, the first lens and the second lens have positive optical powers; the third lens has a negative optical power. The first lens is a positive meniscus lens, the second lens is a doublet lens formed by gluing a negative meniscus lens and a positive meniscus lens, and the third lens is a negative meniscus lens.

[0017] In one embodiment, the second lens assembly includes a fourth lens and a fifth lens, wherein the fourth lens has a positive optical power; the fifth lens has a negative optical power.

[0018] In one embodiment, the fourth lens is a doublet lens formed by gluing a positive convex lens and a negative meniscus lens, and the fifth lens is a doublet lens formed by gluing a negative meniscus lens and a positive meniscus lens.

[0019] In one embodiment, the image plane includes an optical fiber array.

[0020] In a second aspect, an embodiment of the present application provides a plasma temperature diagnostic system for a fusion device, including: the optical lens described in any one of the above first aspects; and a diagnostic device configured to receive the line emission spectrum of the plasma of the fusion device collected by the optical lens.

[0021] The beneficial effects of the present application are at least as follows:

[0022] The optical lens of the present application includes a first lens assembly, a mirror assembly, and a second lens assembly sequentially installed along the direction from the object plane to the image plane. The imaging area of the object plane in the current imaging of the image plane is a partial area of the object plane; the mirror assembly includes an adjustment device for adjusting the position of the mirror assembly to change the imaging of different areas of the object plane in the image plane. In the stationary state of the adjustment device, the imaging area of the object plane in the image plane is often only a partial area of the object plane. Therefore, in order to achieve imaging of all areas of the object plane for plasma temperature measurement, a mirror assembly with adjustable position is provided between the first lens assembly and the second lens assembly. By adjusting the position of the mirror assembly through the adjustment device, the propagation path of the reflected light between the first lens assembly and the second lens assembly is changed, and thus the range of the light transmitted by the first lens assembly is changed. Therefore, during the process of adjusting the position of the reflection component by the adjustment device, scanning of different positions of the object plane is achieved, so that different positions of the object plane are imaged in the image plane. It is possible to increase the acquisition range of the line emission spectrum signal of the plasma cross-section in the cavity of the controlled nuclear fusion device, effectively solving the problem of limited measurement space range of the conventional multi-channel Doppler spectroscopy diagnostic system, and realizing the measurement of large-range plasma parameters through a small-scale light-receiving and imaging optical system. Description of the Drawings

[0023] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic cross-sectional view of the plasma chamber of the Tokamak device in the embodiments of the present invention;

[0025] Figure 2 It is a schematic diagram of the imaging area of the object surface in the embodiments of the present invention;

[0026] Figure 3 It is a schematic structural diagram of the optical lens in the embodiments of the present invention;

[0027] Figure 4 It is a schematic diagram of the image plane structure of the plasma temperature diagnostic system of the fusion device in the embodiments of the present invention;

[0028] Figure 5 It is a schematic diagram of the optical path propagation in the mirror assembly in the embodiments of the present invention;

[0029] Figure 6 It is a schematic diagram of the change of the imaging area when the rotating motor rotates in the embodiments of the present invention;

[0030] Figure 7 It is a schematic diagram of the change of the imaging area when the swinging motor swings in the embodiments of the present invention;

[0031] Figure 8 It is a top view of the plasma temperature diagnostic system of the fusion device in the embodiments of the present invention.

[0032] Reference numerals:

[0033] 1, object surface; 11, imaging area; 12, first dashed rectangular frame; 13, second dashed rectangular frame; 14, optical symmetry axis; 2, diagnostic device; 21, fiber optic array; 3, optical lens; 31, first lens assembly; 311, first lens; 312, second lens; 313, third lens; 32, mirror assembly; 321, first mirror; 322, second mirror; 323, third mirror; 33, second lens assembly; 331, fourth lens; 332, fifth lens; 34, adjusting device; 341, rotating motor; 342, swinging motor; 35, optical axis; z, first direction; z', second direction. Detailed implementation manners

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] As described in the background art, as Figure 1 An exemplary cross-sectional schematic diagram of the plasma chamber of a tokamak device is shown, where the area within the dashed circle is the area where line emission spectra need to be collected, corresponding to the area of object plane 1. In the prior art, due to limitations in the field of view and the space of the diagnostic window, it is only possible to Figure 1 Measure a fixed part of the area where line emission spectra need to be collected in Figure 2 For example, the imaging area 11 of object plane 1 shown in

[0036] Based on this, referring to Figures 1-7 , an embodiment of the present application provides an optical lens, which is applicable to the plasma temperature diagnostic system of a fusion device. Among them, as Figure 3 Shown, the optical lens may include:

[0037] A first lens assembly 31, a mirror assembly 32, and a second lens assembly 33 sequentially installed along the direction from object plane 1 to the image plane. The imaging area 11 where object plane 1 currently forms an image on the image plane is a partial area of object plane 1;

[0038] The mirror assembly 32 includes an adjustment device 34 for adjusting the position of the mirror assembly 32 to change the imaging of different areas of object plane 1 on the image plane.

[0039] In one embodiment, the image plane of the plasma temperature diagnostic system of the fusion device may adopt an optical fiber array 21. Exemplarily, as Figure 4 Shown, the image plane of the plasma temperature diagnostic system of the fusion device may adopt a one-dimensional arranged optical fiber array 21. Therefore, corresponding to object plane 1 on the image plane, the imaging area 11 of object plane 1 is the area corresponding to the shape of the one-dimensional arranged optical fiber array 21. In this embodiment, when the adjustment device 34 is in a stationary state, the imaging area 11 where object plane 1 forms an image on the image plane is often only a partial area of object plane 1. For example Figure 2The imaging region 11 of the rectangle corresponding to the one-dimensional array of optical fibers 21 shown in [description]. Therefore, in order to achieve imaging of all regions of the object surface 1 and then measure the plasma temperature, in this embodiment, a position-adjustable mirror assembly 32 is arranged between the first lens assembly 31 and the second lens assembly 33. The position of the mirror assembly 32 is adjusted by the adjusting device 34 to change the propagation path of the reflected light between the first lens assembly 31 and the second lens assembly 33, and further change the range of the light transmitted by the first lens assembly 31. Therefore, during the process of the adjusting device 34 adjusting the position of the reflecting component, scanning of different positions on the object surface 1 is realized, so that different positions on the object surface 1 are imaged on the image plane. It can increase the acquisition range of the line emission spectrum signal of the plasma cross-section in the chamber of the controlled fusion device, effectively solve the problem of limited measurement space range of the conventional multi-channel Doppler spectroscopy diagnostic system, and realize the measurement of large-range plasma parameters through a small-scale light-receiving and imaging optical system.

[0040] In one embodiment, the adjusting device 34 is used to change the position of the optical symmetry axis 14 in the mirror assembly 32, so that different regions of the object surface 1 are imaged on the image plane. In this embodiment, taking the mirror assembly 32 including three mirrors as an example, as Figure 5 shown, three mirrors are added between the first lens assembly 31 and the second lens assembly 33, and the light is reflected three times (odd times), so the final image on the image plane is inverted with respect to the optical symmetry axis 14. The adjusting device 34 changes the position of the optical symmetry axis 14 in the mirror assembly 32 by adjusting the position of the reflecting component, and then changes the position of the imaging region 11 on the object surface 1.

[0041] In one embodiment, the adjusting device 34 may include a rotating motor 341. For example, a stepper rotating motor 341 can be used. The mirrors in the mirror assembly 32 are integrally fixedly installed on the rotating motor 341, and the whole mirror is driven by the rotating motor 341 to rotate around the optical axis 35 of the first lens assembly 31 and / or the second lens assembly 33. Then the optical symmetry axis 14 in the mirror assembly 32 rotates around the optical axis 35, and the object point finally received by the image plane becomes the point symmetric to the point at the zero position of the rotating motor 341 with respect to the optical symmetry axis 14. As Figure 6 shown, when the rotating motor 341 rotates by an angle θ, the acquisition region of the line emission spectrum, that is, the imaging region 11 will change from Figure 6 the original imaging region 11 corresponding to the solid rectangle in [description] to the later imaging region, that is, Figure 6 the region of the first dashed rectangle 12 shown in [description]. Therefore, by driving the whole mirror assembly 32 to rotate by the rotating motor 341, it is possible to realize light collection and imaging of all regions of the object surface 1 on the diameter of the plasma chamber cross-section of the tokamak device.

[0042] In one embodiment, during the process of the rotation motor 341 driving the entire mirror assembly 32 to rotate, the optical symmetry axis 14 also rotates around the optical axes 35 of the lenses in the first lens assembly 31 and the second lens assembly 33. Therefore, the area corresponding to the fiber optic array 21 on the object plane 1 also rotates on the object plane 1. The rotation motor 341 rotates within an angle range greater than 0° and less than or equal to 360°, and the fiber corresponding to the area of the fiber optic array 21 on the object plane 1 is collected in a scanning manner on the object plane 1, thereby achieving imaging of a larger area of the plane where the object plane 1 is located.

[0043] Generally, in order to achieve the alignment between the image plane and the object plane 1, at the zero position of the rotation motor 341, the imaging area 11 of the image plane on the object plane 1 is often at the diameter position of the object plane 1, that is, the optical symmetry axis 14 often coincides with the diameter of the circle where the object plane 1 is located. Therefore, during the rotation scanning, the symmetry axis rotates around the center of the circle, and the imaging area 11 scans the area on the diameter. In order to further achieve a larger scanning range, it is also necessary to scan and image the area corresponding to the chord other than the diameter on the circle where the object plane 1 is located. Therefore, in one embodiment, the adjusting device 34 includes a swing motor 342 for adjusting at least one mirror in the mirror assembly 32. By adjusting the angle of the corresponding mirror, the optical symmetry axis 14 is translated along a direction perpendicular to the optical symmetry axis 14.

[0044] Due to the action of the swing motor 342, the swing motor 342 can drive at least one mirror to swing around the swing axis, which will cause the above-mentioned optical symmetry axis 14 to translate in the object plane along a direction perpendicular to the optical symmetry axis 14. By controlling the rotation angle of the rotation motor 341 and the swing angle of the swing motor 342, the rotation and translation of the optical symmetry axis 14 can be controlled. By controlling the rotation and translation of the optical symmetry axis 14, any position in the object plane can be imaged on the image plane. Refer to Figure 7 ,in Figure 6 On the basis that the rotation motor 341 rotates by an angle θ to form the imaging area 11 corresponding to the first dashed rectangle frame 12, when the swing motor 342 swings by a certain angle, the acquisition area of the line emission spectrum, that is, the imaging area 11, is transformed into the area corresponding to the second dashed rectangle frame 13. Therefore, by the cooperation of the rotation motor 34 and the swing motor 342 to control the rotation and translation of the optical symmetry axis 14, any position in the object plane can be imaged on the image plane. The line emission spectrum signals in any direction and position of the cross-section of the plasma in the cavity of the controlled nuclear fusion device can be collected, effectively solving the problem of limited measurement space range of the conventional multi-channel Doppler spectroscopy system, and realizing the measurement of large-range plasma parameters through a small-scale system.

[0045] In one embodiment, the mirror assembly 32 includes an odd number of mirrors, which are sequentially installed along the direction from the object plane 1 to the image plane. Among them, the mirror close to the image plane side is fixed on the swing motor 342 and can swing around the swing axis. As an exemplary embodiment, by adjusting the angle of at least one of the mirrors through the swing motor 342, the optical symmetry axis 14 can be translated within the object plane 1, and further the imaging area 11 can be translated within the object plane 1, so as to realize the light collection imaging of the area corresponding to any chord within the plane of the object plane 1. In order to make the structure of the mirror assembly 32 simple and convenient to adjust, in one embodiment, the mirror assembly 32 adopts three mirrors, including a first mirror 321, a second mirror 322 and a third mirror 323. With Figure 3 the placement angle of the optical lens shown in, a three-dimensional space coordinate system is established. Among them, the Z-axis is along the optical axis direction of the lenses in the first lens assembly 31 and the second lens assembly 33, the Y-axis is along the "vertically upward" direction of the placement angle of the optical lens, and the X-axis is perpendicular to the observation direction of the placement angle of the optical lens. The three-dimensional space coordinate system established in the above embodiment is only an exemplary example for more clearly explaining the spatial relationship between the mirrors in the mirror assembly, and other coordinate systems that can explain the spatial relationship between the mirrors are equally applicable in this embodiment.

[0046] See Figure 3 As shown, when the swing angle of the swing axis is 0°, the angle between the first mirror 321 and the XZ coordinate plane in the first direction z of the Z-axis is equal to the angle between the third mirror 323 and the XZ coordinate plane in the second direction z' of the Z-axis, and the first mirror 321 and the third mirror 323 are perpendicular to the YZ coordinate plane; the second mirror 322 is perpendicular to the XY coordinate plane and parallel to the XZ coordinate plane, where the first direction z and the second direction z' are opposite, the angle is an acute angle, the Z-axis is parallel to the optical axis 35, and the XY coordinate plane is parallel to the plane where the lenses in the first lens assembly 31 and the second lens assembly 33 are located.

[0047] As an exemplary embodiment, the reflection plane of the first mirror 321 is perpendicular to the YZ coordinate plane and forms an angle of α with the XZ coordinate plane, reflects the light transmitted by the first lens assembly 31, and deflects the propagation direction of the light in the negative direction of the Y-axis (i.e., Figure 3 the "vertically downward" direction along the placement angle of the optical lens in), the light incident surface of the second mirror 322 is the reflection surface, the reflection plane is perpendicular to the XY coordinate plane and parallel to the XZ coordinate plane, reflects the light from the first mirror 321, and makes the propagation direction of the light in the positive direction of the Y-axis (i.e., Figure 3It deflects by 4|α| in the "vertically upward" direction along the placement angle of the optical lens); The third mirror 323 is fixed on the swing motor 342, and the straight line passing through the midpoints of two sides is the swing axis. The third mirror 323 can swing around the axis under the action of the swing motor. When the swing angle of the third mirror 323 is 0°, the image side is the reflecting surface, and the reflecting plane is perpendicular to the YZ coordinate plane and forms an angle of -α with the XZ coordinate plane, reflecting the light from the second mirror 322 and deflecting the propagation direction of the light by 2|α| in the negative Y-axis direction.

[0048] As an exemplary embodiment, the first mirror 321 is elliptical, the second mirror 322 is elliptical, and the third mirror 323 is rectangular. Among them, the minor axis of the first mirror 321 is parallel to the minor axis of the second mirror 322 and perpendicular to the YZ plane. The long side of the third mirror is parallel to the minor axis of the second mirror 322, and the swing axis is the straight line passing through the midpoints of two short sides.

[0049] The first mirror 321 and the second mirror 322 are set to be elliptical, which can increase the pupil and thus increase the light input. While the third mirror 323 is set to be rectangular, which can better adapt to the shape of the light array 21 on the image plane, and thus make the image plane image better.

[0050] Next, the structural details of the mirror assembly 32 will be introduced in combination with the position parameters of the first mirror 321, the second mirror 322, and the third mirror 323, and taking Figure 3 the three-dimensional space coordinate system shown as an example.

[0051] The first mirror 321 is a plane mirror with an elliptical shape. The minor axis of the ellipse is parallel to the X-axis of the coordinate system. The object side is the reflecting surface, and the reflecting plane is perpendicular to the YZ coordinate plane and makes an angle of -25° with the XZ coordinate plane. It reflects the light coming from the third lens 313, deflecting the propagation direction of the light by 50° in the negative Y-axis direction. The second mirror 322 is a plane mirror with an elliptical shape. The minor axis of the ellipse is parallel to the minor axis of the first mirror 321. The light incident side is the reflecting surface, and the reflecting plane is perpendicular to the XY coordinate plane and parallel to the XZ coordinate plane. It reflects the light coming from the first mirror 321, deflecting the propagation direction of the light by 100° in the positive Y-axis direction. The third mirror 323 is a plane mirror with a rectangular shape. The third mirror 323 is fixed on a swing motor, and the straight line passing through the midpoints of the two short sides is the swing axis. The third mirror 323 can swing around the axis under the action of the swing motor, and the swing angle is ±11°. When the swing angle of the third mirror 323 is 0°, the long side is parallel to the minor axis of the second mirror 322. The image side is the reflecting surface, and the reflecting plane is perpendicular to the YZ coordinate plane and makes an angle of 25° with the XZ coordinate plane. It reflects the light coming from the second mirror 322, deflecting the propagation direction of the light by 50° in the negative Y-axis direction. Among them, the numerical value of the angle between the first mirror 321 and the XZ coordinate plane is for exemplary illustration, and the angle data that can satisfy the light reflection path as shown in Figure 5 is also applicable in this embodiment. The positive and negative signs of the above angles are defined by the first direction z and the second direction z' relative to the Z-axis, and in this embodiment, it is to distinguish the angle direction.

[0052] The mirrors in the overall mirror assembly 32 are fixed on a stepper motor, and under the drive of the stepper motor, the mirrors in the overall mirror assembly 32 can rotate around the center of the front group lens optical axis 35, and the rotation angle is from 0° to 360°.

[0053] In one embodiment, the first lens assembly 31 includes a first lens 311, a second lens 312, and a third lens 313. Among them, the first lens 311 and the second lens 312 have positive optical powers; the third lens 313 has a negative optical power. Among them, the positive optical power of the first lens 311 converges the light coming from the object surface 1, and the positive optical power of the second lens 312 further converges the light coming from the first lens 311 on the basis of the first lens 311. The negative optical power of the third lens 313 can increase the focal length of the lens system to meet the increased optical path due to the addition of the mirror assembly 32.

[0054] In one embodiment, the first lens 311 is a positive meniscus lens, which can increase the object-space numerical aperture NA1 of the system, enabling the lens to capture a larger field of view. The second lens 312 is a doublet lens formed by gluing a negative meniscus lens and a positive meniscus lens. Since the doublet lens can effectively correct chromatic aberration, it can effectively avoid systematic errors caused by chromatic aberration when collecting characteristic spectral lines of different wavelengths. Further, the doublet lens formed by gluing a negative meniscus lens and a positive meniscus lens can correct the spherical aberration brought by the first lens 311 to a certain extent. The third lens 313 is a negative meniscus lens, which, while increasing the focal length of the lens system, reduces the object-space numerical aperture NA1 and further corrects the spherical aberration of the system.

[0055] In one embodiment, the second lens assembly 33 includes a fourth lens 331 and a fifth lens 332. Among them, the fourth lens 331 has a positive optical power; the fifth lens 332 has a negative optical power. Among them, the positive optical power of the fourth lens 331 converges the light rays reflected by the third mirror 323. The negative optical power of the fifth lens 332 can increase the focal length of the lens system.

[0056] In one embodiment, the fourth lens 331 is a doublet lens formed by gluing a positive convex lens and a negative meniscus lens, and the fifth lens 332 is a doublet lens formed by gluing a negative meniscus lens and a positive meniscus lens; among them, the doublet lens in the fourth lens 331 can effectively correct chromatic aberration, can effectively correct the chromatic aberration amplified due to the longer optical path in the middle group, and can effectively avoid systematic errors caused by chromatic aberration when collecting characteristic spectral lines of different wavelengths. Further, the doublet lens formed by gluing a positive convex lens and a negative meniscus lens can introduce as little spherical aberration as possible into the lens system. The doublet lens in the fifth lens 332 can reduce the image-space numerical aperture NA2 and correct the small spherical aberration introduced by the fourth lens 331. Since the fifth lens 332 is a doublet lens, the introduction of large chromatic aberration is avoided.

[0057] The embodiment of the present application also provides a plasma temperature diagnostic system for a fusion device, as Figure 8 shown. The diagnostic system may include the optical lens 3 described in the above embodiment; and a diagnostic device 2 for receiving the line emission spectrum of the object surface 1 of the plasma of the fusion device collected by the optical lens 3.

[0058] The above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

[0059] In the above embodiments of the present application, the descriptions of the respective embodiments each have their own emphasis. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0060] The above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. An optical lens, applicable to the plasma temperature diagnostic system of a fusion device, characterized in that The optical lens includes a first lens assembly, a mirror assembly, and a second lens assembly sequentially installed in the direction from the object plane to the image plane. The imaging area of the object plane in the current imaging of the image plane is a partial area of the object plane. The mirror assembly includes an adjustment device for adjusting the position of the mirror assembly to change the imaging of different regions of the object plane in the image plane. The object plane is the area of the line emission spectrum in the plasma chamber of the fusion device, and the image plane is the image plane of the plasma temperature diagnostic system of the fusion device. The image plane uses a fiber optic array. The adjustment device includes a rotation motor. The mirror in the mirror assembly is integrally fixedly installed on the rotation motor and is driven by the rotation motor to rotate the mirror integrally around the optical axis of the first lens assembly and / or the second lens assembly, so that the area corresponding to the fiber optic array on the area of the line emission spectrum rotates on the area of the line emission spectrum.

2. The optical lens according to claim 1, characterized in that, The rotation angle of the rotation motor is greater than 0° and less than or equal to 360°.

3. The optical lens according to claim 1, characterized in that The adjustment device includes a swing motor for adjusting at least one mirror in the mirror assembly. By adjusting the angle of the corresponding mirror, the optical symmetry axis in the mirror assembly is translated along the direction perpendicular to the optical symmetry axis.

4. The optical lens according to claim 3, wherein The mirror assembly includes a first mirror, a second mirror, and a third mirror sequentially installed in the direction from the object plane to the image plane. Among them, the third mirror is fixed on the swing motor and can swing around the swing axis. When the swing angle of the swing axis is 0°, the angle between the first mirror and the XZ coordinate plane in the first direction of the Z axis is equal to the angle between the third mirror and the XZ coordinate plane in the second direction of the Z axis, and the first mirror and the third mirror are perpendicular to the YZ coordinate plane; the second mirror is perpendicular to the XY coordinate plane and parallel to the XZ coordinate plane. Among them, the first direction and the second direction are opposite, the angle is an acute angle, the Z axis is parallel to the optical axis of the first lens assembly and / or the second lens assembly, and the XY coordinate plane is parallel to the lens main plane in the first lens assembly and the second lens assembly.

5. The optical lens according to claim 4, characterized in that, The reflecting surface of the first mirror is on the object plane side, the reflecting surface of the second mirror is the light incident surface, and the reflecting surface of the third mirror is on the image plane side.

6. The optical lens according to claim 4, wherein, The first mirror is elliptical, the second mirror is elliptical, and the third mirror is rectangular; the short axis of the first mirror is parallel to the short axis of the second mirror and perpendicular to the YZ coordinate plane, the long side of the third mirror is parallel to the short axis of the second mirror, and the swing axis passes through the straight line of the midpoints of the two short sides.

7. The optical lens according to claim 1, wherein The first lens assembly includes a first lens, a second lens, and a third lens. Among them, the first lens and the second lens have positive optical power; the third lens has negative optical power.

8. The optical lens according to claim 7, wherein The first lens is a positive meniscus lens; the second lens is a doublet lens formed by gluing a negative meniscus lens and a positive meniscus lens; the third lens is a negative meniscus lens.

9. The optical lens according to claim 1, wherein, The second lens assembly includes a fourth lens and a fifth lens. Among them, the fourth lens has positive optical power; the fifth lens has negative optical power.

10. The optical lens according to claim 9, characterized in that, The fourth lens is a doublet lens formed by gluing a positive convex lens and a negative meniscus lens; the fifth lens is a doublet lens formed by gluing a negative meniscus lens and a positive meniscus lens.

11. A plasma temperature diagnostic system for a fusion device, characterized in that, Comprising: The optical lens according to any one of claims 1-10; And A diagnostic device for receiving the line emission spectrum of the plasma of the fusion device collected by the optical lens.

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