Rotary neutron target heat dissipation method, rotary neutron target and neutron target system

Abstract

The invention relates to the technical field of neutron sources and discloses a rotating neutron target heat dissipation method, a rotating neutron target and a neutron target system.The rotating neutron target heat dissipation method is characterized in that a heat exchange structure is arranged on the side face of a target piece, and a cooling medium is introduced into the heat exchange structure and used for assisting in heat dissipation of the target piece; according to the invention, the technical problem that in the prior art, a beam bombardment area coincides with the cooling water flow channel of the neutron target, the heat dissipation effect of the target sheet can be achieved, neutrons generated by the neutron target in the beam direction are slowed down, and the quality of the neutron beam is reduced can be solved; according to the invention, on the premise of maintaining effective heat dissipation and cooling of the neutron target, a flow bombardment area can be prevented from being overlapped with the cooling water flow channel of the neutron target, so that high-quality neutron beams can be output at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of neutron sources, and in particular to a rotating neutron target heat dissipation method, a rotating neutron target and a neutron target system. Background Art

[0002] In the field of neutron target technology, beams are mainly used to bombard target pieces, so that nuclear reactions occur to produce the required neutrons, which are then used in detection, imaging, medical treatment and other fields. In order to obtain a high neutron source intensity, a large beam of particles is generally used to bombard the target piece, so that a nuclear reaction occurs to produce neutrons, and a large amount of heat is deposited on the target piece at this time. In order to increase the heat dissipation performance of the target, a coolant is usually used to force the target to cool, and the target piece is rotated and the beam bombardment radius is increased to improve the cooling effect. Therefore, for a high-intensity neutron source, the target piece diameter is also larger.

[0003] In the prior art, the area bombarded by the beam coincides with the cooling water flow channel of the neutron target. The circulating flow of cooling water can effectively remove the heat deposited in the neutron target to prevent the target from overheating. However, in the beam direction, the neutrons generated by the neutron target will be affected by the slowing down of the cooling water, resulting in a decrease in the quality of the neutron beam, which limits the application of the neutron target in high-quality neutrons. In other words, how to prevent the cooling medium from affecting the quality of neutrons is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the embodiments of the present invention propose a rotating neutron target heat dissipation method, a rotating neutron target, and a neutron target system, which can solve the technical problem that in the prior art, the area bombarded by the beam overlaps with the cooling water channel of the neutron target, which can play a role in heat dissipation of the target sheet, but also slows down the neutrons generated by the neutron target in the beam direction, thereby causing the quality of the neutron beam to decrease. The present invention can achieve the premise of maintaining effective heat dissipation and cooling of the neutron target, and can avoid the overlap of the area bombarded by the beam and the cooling water channel of the neutron target, so as to output a higher quality neutron beam at the same time.

[0005] On the one hand, a rotating neutron target heat dissipation method is provided, wherein the rotating neutron target includes a target plate, the front side of the target plate is used to be bombarded by a beam, a heat exchange structure is arranged on the side of the target plate, and a cooling medium is passed through the heat exchange structure to assist the target plate in heat dissipation.

[0006] In the prior art, the area bombarded by the beam overlaps with the cooling water channel of the neutron target. Although it can play a role in heat dissipation of the target, it also slows down the neutrons generated by the neutron target in the beam direction, thereby causing the quality of the neutron beam to deteriorate. The present scheme arranges the heat exchange structure on the side area of ​​the target, which can solve the above technical problems and can avoid the overlap of the area bombarded by the beam with the cooling water channel of the neutron target while maintaining effective heat dissipation and cooling of the neutron target, so as to output a higher quality neutron beam at the same time.

[0007] Furthermore, a heat exchange channel is provided in the heat exchange structure, and the heat exchange channel is used to pass a cooling medium; the heat exchange channel is close to the side of the target piece, and the extension direction of the heat exchange channel is parallel to the extension direction of the side of the target piece.

[0008] Furthermore, the heat exchange flow channel includes a plurality of flow channel units, each of which includes:

[0009] A first straight line segment, the first straight line segment extending along the outer ring radius direction of the first annular area;

[0010] an arc segment, wherein the radius of the arc segment is equal to the radius of the outer ring of the first annular zone, one end of the arc segment is connected to one end of the first straight segment, and the other end of the first straight segment is provided with a cooling medium inlet;

[0011] A second straight line segment extends along the outer ring radius of the first annular area, one end of the second straight line segment is connected to the other end of the arc segment, and the other end of the second straight line segment is provided with a medium outlet.

[0012] Furthermore, the heat exchange flow channels are provided with at least three layers, and the heat exchange flow channels of each layer are arranged linearly and spaced apart in the thickness direction of the heat exchange structure, and each of the flow channel units is evenly distributed in each layer of the heat exchange flow channels.

[0013] On the other hand, a rotating neutron target is provided, which is used to implement the rotating neutron target heat dissipation method as described above, comprising:

[0014] A heat dissipation substrate, the heat dissipation substrate having a first annular area and a second annular area, wherein the outer ring radius of the first annular area is equal to the inner ring radius of the second annular area;

[0015] an annular target piece, wherein the annular target piece is arranged in the second annular area;

[0016] A heat exchange structure, wherein the heat exchange structure is arranged in the first annular area, and a heat exchange flow channel is arranged in the heat exchange structure, and the heat exchange flow channel is used to pass a cooling medium;

[0017] The annular target piece has an inner ring, the side wall of the inner ring faces the center of the rotating neutron target, and the heat exchange structure is in contact with the side wall of the inner ring.

[0018] In this solution, the target surface of the rotating neutron target is disc-shaped, and the target piece is an annular target piece, and is arranged at a position close to the periphery of the target surface. Specifically, the annular target piece is fixed to the second annular area, specifically by welding.

[0019] Furthermore, the annular target piece includes a plurality of spliced ​​target pieces, each of which can be spliced ​​into an annular structure; the heat exchange structure is attached to the side walls of each spliced ​​target piece facing the center of the rotating neutron target.

[0020] Furthermore, an annular groove for installing the annular target piece is provided on the heat dissipation substrate, the second annular area is located in the annular groove, the annular target piece is installed in the annular groove, and the side surface of the annular target piece is fixedly connected to the side surface of the first annular area facing the second annular area; after the annular target piece is correctly installed, the target surface of the annular target piece is flush with the surface of the first annular area.

[0021] Furthermore, an annular hydrogen absorption layer is provided between the annular target and the annular groove for absorbing excess hydrogen. The purpose of installing the hydrogen absorption layer is to prevent hydrogen from agglomerating into bubbles and causing embrittlement of the annular target material.

[0022] As one of the structural forms of the splicing target, the two sides of the splicing target for splicing with other splicing target pieces respectively have a splicing part and a groove; the opening of the groove has a contraction part, the outer peripheral shape of the splicing part matches the inner peripheral shape of the groove, and after the splicing part is spliced ​​into the groove, the contraction part can prevent the splicing part from escaping from the groove along the target surface direction.

[0023] In yet another aspect, a neutron target system is provided for generating one of a neutron beam, a continuous neutron flux and a pulsed neutron flux, characterized in that it comprises the rotating neutron target as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the front view structure of the rotating neutron target according to the first embodiment of the present invention.

[0025] Figure 2 It is a schematic side view of the structure of the rotating neutron target according to the first embodiment of the present invention.

[0026] Figure 3 yes Figure 2 Middle BB cross-section.

[0027] Figure 4 yes Figure 3 Enlarged view of area C.

[0028] Figure 5 yes Figure 1 Middle AA section view.

[0029] Figure 6 yes Figure 5 Enlarged view of area D in the middle.

[0030] Figure 7 It is a schematic diagram of a rotating neutron target according to the second embodiment of the present invention.

[0031] Figure 8 yes Figure 7 Schematic cross section of .

[0032] Fig. 9 It is a schematic structural diagram of one embodiment of the splicing target pieces in the second embodiment of the present invention.

[0033] Fig.10 It is a schematic structural diagram of one embodiment of the splicing target pieces in the second embodiment of the present invention.

[0034] Fig.11 It is a thermal distribution diagram of the neutron target in the prior art when it is working.

[0035] Fig.12 This is a thermal distribution diagram of the neutron target in the second embodiment of the present invention when it is working.

[0036] Figure numerals: 1000, rotating neutron target; 100, heat dissipation base; 110, first annular area; 120, second annular area; 130, heat exchange flow channel; 131, flow channel unit; 131a, first straight segment; 131b, arc segment; 131c, second straight segment; 140, axial hole; 150, mounting hole; 160, annular groove; 132, medium inlet; 133, medium outlet; 200, annular target piece; 210, spliced ​​target piece; 211, splicing part; 212, groove; 300, annular hydrogen absorption layer; 310, fan-ring hydrogen absorption piece. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0038] Embodiment 1

[0039] This embodiment discloses a rotating neutron target structure, which is used to implement the above-mentioned rotating neutron target heat dissipation method. It can solve the technical problem in the prior art that the area bombarded by the beam overlaps with the cooling water flow channel of the neutron target, which can play a role in heat dissipation of the target sheet, but also slows down the neutrons generated by the neutron target in the beam direction, thereby causing the quality of the neutron beam to decrease. It can achieve the premise of maintaining effective heat dissipation and cooling of the neutron target, and avoid the overlap of the area bombarded by the beam and the cooling water flow channel of the neutron target, so as to output a higher quality neutron beam at the same time.

[0040] like Figures 1 to 5 As shown, the rotating neutron target 1000 includes a heat dissipation base 100 and an annular target piece 200 .

[0041] The heat dissipation substrate 100 comprises a first annular area 110 and a second annular area 120, wherein the outer ring radius of the first annular area 110 is equal to the inner ring radius of the second annular area 120; an annular target plate 200, wherein the annular target plate 200 is arranged in the second annular area 120; a heat exchange structure, wherein the heat exchange structure is arranged in the first annular area 110, wherein a heat exchange channel 130 is arranged in the heat exchange structure, wherein the heat exchange channel 130 is used for passing a cooling medium; the annular target plate 200 comprises an inner ring, wherein the side wall of the inner ring faces the center of the rotating neutron target 1000, and the heat exchange structure is in contact with the side wall of the inner ring.

[0042] Specifically, the side surfaces of the target piece refer to two sides intersecting with the front surface of the target piece.

[0043] The rotating neutron target 1000 in this embodiment has the heat exchange structure and the annular target plate 200 disposed on the first annular area 110 and the second annular area 120, respectively, so as to avoid the presence of a flowing cooling medium behind the neutron beam target position, thereby reducing the influence of the cooling medium on the neutron beam, that is, to avoid the neutrons generated by the beam bombarding the rotating neutron target 1000 from being affected by the cooling medium. In other words, separating the heat exchange channel 130 and the annular target plate 200 can avoid the neutrons generated by the rotating neutron target 1000 from being affected by the slowing down of the cooling medium, thereby ensuring the high quality of the neutron beam. At the same time, the heat exchange channel 130 can also perform heat exchange on the heat dissipation substrate 100, so as to avoid the heat dissipation substrate 100 and the annular target plate 200 from being damaged due to excessive temperature.

[0044] In this solution, the target surface of the rotating neutron target is disc-shaped, and the target piece is an annular target piece, and is arranged at a position close to the periphery of the target surface. Specifically, the annular target piece is fixed to the second annular area, specifically by welding.

[0045] In some specific embodiments, Figures 1 to 4As shown, a shaft hole 140 is provided at the center of the heat dissipation base 100, and the shaft hole 140 is mainly used to connect a rotating shaft, wherein the rotating shaft can drive the rotating neutron target 1000 to rotate.

[0046] In some specific embodiments, Figures 1 to 4 As shown, eight mounting holes 150 are arranged in a circumferential array on the heat dissipation substrate 100 . The mounting holes 150 are adjacent to the shaft hole 140 . The tooling and the rotating neutron target 1000 are connected by bolts, and the rotating shaft is assembled in the shaft hole 140 .

[0047] In some specific embodiments, Figures 1 to 4 As shown, eight mounting holes 150 are arranged in a circumferential array on the heat dissipation substrate 100 . The mounting holes 150 are adjacent to the shaft hole 140 . The tooling and the rotating neutron target 1000 are connected by bolts, and the rotating shaft is assembled in the shaft hole 140 .

[0048] In some specific embodiments, Figures 1 to 4 As shown, the heat dissipation substrate 100 is provided with an annular groove 160 for installing the annular target piece 200, and the second annular area 120 is located in the annular groove 160. Specifically, the annular groove 160 is mainly used to install the annular target piece 200, wherein the annular groove 160 on the heat dissipation substrate 100 can make the heat dissipation substrate 100 distributed in a step-by-step manner, and then the heat exchange flow channel 130 is arranged on the first annular area 110, which can avoid the presence of cooling medium in the direction of the neutron beam, and prevent the cooling medium from affecting the straightness of the neutron beam. At the same time, there is a gap at the connection between two adjacent spliced ​​target pieces 210. When the beam bombards the spliced ​​target piece 210, part of the beam can pass through the gap directly through the target piece and bombard the heat dissipation substrate 100, that is, the heat dissipation substrate 100 can block the beam, and prevent the beam from passing through the rotating neutron target 1000 and bombarding other equipment, thereby preventing other equipment from being damaged by the beam bombardment.

[0049] In some specific embodiments, the material of the heat dissipation substrate 100 is chromium zirconium copper.

[0050] In some specific embodiments, Figures 1 to 4As shown, the heat exchange channel 130 includes a plurality of channel units 131, each of which includes a first straight segment 131a, an arc segment 131b, and a second straight segment 131c. The first straight segment 131a extends along the outer ring radius direction of the first annular area 110, the radius size of the arc segment 131b is less than or equal to the outer ring radius size of the first annular area 110, one end of the arc segment 131b is connected to one end of the first straight segment 131a, and the second straight segment 131c extends along the outer ring radius direction of the first annular area 110, and one end of the second straight segment 131c is connected to the other end of the arc segment 131b. Specifically, the first straight segment 131a, the arc segment 131b, and the second straight segment 131c form a channel unit 131 similar to an "n" type, and the channel unit 131 similar to the "n" type can increase the heat exchange area of ​​the heat dissipation substrate 100 to improve the heat exchange effect of the heat exchange channel 130. At the same time, the arc segment 131 b is close to the second annular area 120 , which is more conducive to cooling the second annular area 120 .

[0051] It should be noted that the shape of the flow channel unit 131 can be other shapes. The flow channel unit 131 mainly exchanges heat with the heat dissipation substrate 100 and indirectly exchanges heat with the annular target plate 200 .

[0052] In some specific embodiments, Figures 1 to 4 As shown, a medium inlet 132 is provided at the other end of the first straight segment 131a, and a medium outlet 133 is provided at the other end of the second straight segment 131c. Specifically, the cooling medium can enter the flow channel unit 131 through the medium inlet 132, and flow through the first straight segment 131a, the arc segment 131b and the second straight segment 131c in sequence. In addition, the medium outlet 133 and the medium inlet 132 can be located on the front side of the heat dissipation base 100, or on the back side of the heat dissipation base 100. Preferably, the medium inlet 132 is located on the front side of the heat dissipation base 100, and the medium inlet 132 is located on the back side of the heat dissipation base 100.

[0053] In some specific embodiments, Figure 4 and Figure 5 As shown, at least three of the plurality of flow channel units 131 are arranged linearly and spaced apart in the thickness direction of the heat dissipation substrate 100. Specifically, in the thickness direction of the heat dissipation substrate 100, the flow channel units 131 are arranged linearly and spaced apart, that is, the plurality of flow channel units 131 can improve the local heat exchange efficiency of the heat dissipation substrate 100, and further improve the local heat exchange efficiency of the annular target plate 200. It should be noted that the number of the flow channel units 131 arranged at intervals is preferably three, but in a specific embodiment of the present invention, the number of the flow channel units 131 arranged at intervals can be four, five, etc.

[0054] It should be further explained that, as other specific embodiments of the present invention, in specific implementation, the number of flow channel units 131 in the thickness direction of the heat dissipation substrate 100, and the positions and numbers of the medium outlets 133 and the medium inlets 132 can be changed according to heat dissipation requirements.

[0055] In some specific embodiments, Figures 1 to 4 As shown, the annular target piece 200 is disposed on the heat dissipation substrate 100, and the annular target piece 200 is located in the second annular area 120. Specifically, the annular target piece 200 is located in the second annular area 120, which can prevent the neutrons generated by the beam bombarding the rotating neutron target 1000 from being affected by the cooling medium. In other words, the annular target piece 200 is located in the second annular area 120, which can prevent the neutrons generated by the rotating neutron target 1000 from being affected by the slowing down of the cooling medium, thereby ensuring the high quality of the neutron beam.

[0056] Working principle:

[0057] During the high-speed rotation of the rotating neutron target 1000, the beam continuously bombards the annular target piece 200 located in the second annular area 120. The annular target piece 200 will gather a large amount of residual heat under the beam bombardment, and the annular target piece 200 exchanges heat with the heat dissipation substrate 100, and the heat dissipation substrate 100 exchanges heat with the cooling medium in the heat exchange flow channel 130 located in the first annular area 110, thereby reducing the temperature of the annular target piece 200 and the heat dissipation substrate 100.

[0058] Embodiment 2

[0059] This embodiment discloses a rotating neutron target structure, which is used to implement the above-mentioned rotating neutron target heat dissipation method. It can solve the technical problem in the prior art that the area bombarded by the beam overlaps with the cooling water flow channel of the neutron target, which can play a role in heat dissipation of the target sheet, but also slows down the neutrons generated by the neutron target in the beam direction, thereby causing the quality of the neutron beam to decrease. It can achieve the premise of maintaining effective heat dissipation and cooling of the neutron target, and avoid the overlap of the area bombarded by the beam and the cooling water flow channel of the neutron target, so as to output a higher quality neutron beam at the same time.

[0060] On the basis of Example 1, the structure of the annular target piece is further improved, and the annular target piece is disassembled into multiple spliced ​​target pieces. The splicing method can cope with the increase in temperature during the operation of the neutron target or the decrease in temperature when the operation is stopped, which may easily cause the structural deformation of the entire annular target piece to continue to expand and contract due to heat, which may cause structural damage to the annular target piece and reduce the service life of the target piece. After splicing, there are splicing seams between the spliced ​​target pieces, which can play a function similar to that of a heat shrinkage seam, can cope with the thermal expansion and contraction process of the target piece, and thus extend the service life of the target piece.

[0061] In some specific embodiments, Figures 7 and 8 As shown, the shape of the rotating neutron target 1000 is circular.

[0062] In some specific embodiments, Figures 7 and 8 As shown, the annular target piece 200 includes several spliced ​​target pieces 210, and at least twelve of the several spliced ​​target pieces 210 are arranged in a circular array to form an annular target layer. Specifically, compared with the traditional large-diameter whole target piece, several spliced ​​target pieces 210 are combined into an annular target layer, and the target layer will not be damaged due to different local thermal stresses. However, the large-diameter whole target piece will cause irreversible local deformation due to different local thermal stresses, which may cause severe damage to the target piece. At the same time, the spliced ​​target piece 210 is easy to process and can reduce production costs. In other words, combining several spliced ​​target pieces 210 into an annular target layer avoids the problem that the large-diameter whole target piece is easy to crack when heated and its processing is difficult, thereby reducing costs and risks.

[0063] In some specific embodiments, Figure 5 and Figure 8 As shown, at least twelve of the plurality of flow channel units 131 are arranged in a circumferential array. Specifically, the number of the flow channel units 131 arranged in a circumferential array may be twelve, or more than twelve. The flow channel units 131 arranged in a circumferential array may improve the heat exchange efficiency of the heat exchange flow channel 130 to the heat dissipation substrate 100, and further improve the heat exchange efficiency to the annular target plate 200.

[0064] In some specific embodiments, Figure 4 and Figure 5 As shown, the rotating neutron target 1000 further includes an annular hydrogen absorption layer 300, which is disposed between the heat dissipation substrate 100 and the annular target sheet 200. Specifically, the annular hydrogen absorption layer 300 is mainly used to absorb hydrogen. The purpose of installing the hydrogen absorption layer is to prevent hydrogen from agglomerating into bubbles and causing embrittlement of the annular target sheet material.

[0065] Specifically, the annular target piece is fixed to the annular hydrogen absorption layer, and the annular hydrogen absorption layer is fixed to the annular groove, and the fixing is specifically carried out in the form of welding.

[0066] In some specific embodiments, Figure 5 and Figure 6 As shown, the annular hydrogen absorption layer 300 includes a plurality of fan-ring hydrogen absorption sheets 310, at least twelve of which are arranged in a circumferential array to form an annular hydrogen absorption layer, wherein the fan-ring hydrogen absorption sheets 310 correspond one-to-one to the spliced ​​target pieces 210. Specifically, the fan-ring hydrogen absorption sheets 310 are easy to process, which can reduce production costs.

[0067] In some specific embodiments, Fig. 9 and Fig.10 As shown, as some of the structural forms of the splicing target 210, the two sides of the splicing target 210 for splicing with other splicing targets 210 respectively have a splicing portion 211 and a groove 212; the opening of the groove 212 has a contraction portion, and the outer peripheral shape of the splicing portion 211 matches the inner peripheral shape of the groove 212. After the splicing portion 211 is spliced ​​into the groove 212, the contraction portion can prevent the splicing portion 211 from escaping from the groove 212 along the target surface direction. In this way, when splicing, the splicing portion of one splicing target is spliced ​​with the groove of another splicing target to realize the splicing of the splicing targets, and each splicing target is evenly divided according to the shape of a ring, so that each splicing target has the same shape and can be spliced ​​into a ring.

[0068] See also Fig.11 and Fig.12 , it can be seen that the heat dissipation effect of the neutron target in the prior art is compared with the heat dissipation effect of the rotating neutron target in this embodiment, wherein Fig.11 This is the thermal distribution diagram of the neutron target in the prior art when it is working. It can be seen that the maximum calorific value is 4.06×10 3 ,and Fig.12 In the thermal distribution diagram of the rotating neutron target of this embodiment during operation, it can be seen that the maximum calorific value is reduced to 3.97×10 2 , with an order of magnitude difference in heat dissipation, the heat dissipation effect of the rotating target plate of this embodiment is significantly improved compared with the prior art.

[0069] Working principle:

[0070] During the high-speed rotation of the rotating neutron target 1000, the beam continuously bombards the annular target piece 200 located in the second annular area 120. The annular target piece 200 is composed of a plurality of spliced ​​target pieces 210. The spliced ​​target pieces 210 will gather a large amount of residual heat under the bombardment of the beam. The spliced ​​target pieces 210 exchange heat with the heat dissipation substrate 100, and the heat dissipation substrate 100 then exchanges heat with the cooling medium in the heat exchange flow channel 130 located in the first annular area 110, thereby reducing the temperature of the spliced ​​target pieces 210 and the heat dissipation substrate 100. In addition, the spliced ​​target pieces 210 and the heat dissipation substrate 100 are located at different positions of the heat dissipation substrate 100, which can prevent the neutrons generated by the rotating neutron target 1000 from being affected by the slowing down of the cooling medium, thereby ensuring the high quality of the neutron beam.

[0071] In some specific embodiments, a neutron target system is used to generate one of a neutron beam, a continuous neutron flux, and a pulsed neutron flux, and the neutron target system includes the rotating neutron target 1000 described above.

[0072] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0073] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0074] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0076] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0077] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A method for heat dissipation of a rotating neutron target, wherein the rotating neutron target comprises a target sheet, the front side of the target sheet is used to be bombarded by a beam, and the method is characterized in that: A heat exchange structure is arranged on the side of the target piece, and a cooling medium is introduced into the heat exchange structure to assist the target piece in heat dissipation.

2. The rotating neutron target heat dissipation method according to claim 1, characterized in that: The heat exchange structure is provided with a heat exchange channel, and the heat exchange channel is used to pass a cooling medium; The heat exchange channel is close to the side surface of the target piece, and an extension direction of the heat exchange channel is parallel to an extension direction of the side surface of the target piece.

3. The rotating neutron target heat dissipation method according to claim 2, characterized in that: The heat exchange flow channel includes a plurality of flow channel units, each of which includes: A first straight line segment, the first straight line segment extending along the outer ring radius direction of the first annular area; an arc segment, wherein the radius of the arc segment is equal to the radius of the outer ring of the first annular zone, one end of the arc segment is connected to one end of the first straight segment, and the other end of the first straight segment is provided with a cooling medium inlet; A second straight line segment extends along the outer ring radius of the first annular area, one end of the second straight line segment is connected to the other end of the arc segment, and the other end of the second straight line segment is provided with a medium outlet.

4. The rotating neutron target heat dissipation method according to claim 3, characterized in that: The heat exchange flow channels are provided with at least three layers, and the heat exchange flow channels of each layer are arranged linearly and spaced apart in the thickness direction of the heat exchange structure, and each of the flow channel units is evenly distributed in each layer of the heat exchange flow channels.

5. A rotating neutron target, used to implement the rotating neutron target heat dissipation method according to any one of claims 2 to 4, characterized in that: include: A heat dissipation substrate, the heat dissipation substrate having a first annular area and a second annular area, wherein the outer ring radius of the first annular area is equal to the inner ring radius of the second annular area; an annular target piece, wherein the annular target piece is arranged in the second annular area; A heat exchange structure, wherein the heat exchange structure is arranged in the first annular area, and a heat exchange flow channel is arranged in the heat exchange structure, and the heat exchange flow channel is used to pass a cooling medium; The annular target piece has an inner ring, the side wall of the inner ring faces the center of the rotating neutron target, and the heat exchange structure is in contact with the side wall of the inner ring.

6. The rotating neutron target according to claim 5, characterized in that: The annular target piece includes a plurality of spliced ​​target pieces, each of which can be spliced ​​into an annular structure; the heat exchange structure is attached to the side wall of each spliced ​​target piece facing the center of the rotating neutron target.

7. The rotating neutron target according to claim 5 or 6, characterized in that: The heat dissipation substrate is provided with an annular groove for installing the annular target piece, the second annular area is located in the annular groove, the annular target piece is installed in the annular groove, and the side surface of the annular target piece is fixedly connected to the side surface of the first annular area facing the second annular area; After the annular target piece is correctly installed, the target surface of the annular target piece is flush with the surface of the first annular area.

8. The rotating neutron target according to claim 7, characterized in that: An annular hydrogen absorption layer is provided between the annular target piece and the annular groove for absorbing excess hydrogen.

9. The rotating neutron target according to claim 6, characterized in that: The two sides of the splicing target piece used for splicing with other splicing target pieces respectively have a splicing portion and a groove; The opening of the groove has a contraction portion, the outer peripheral shape of the splicing portion matches the inner peripheral shape of the groove, and after the splicing portion is spliced ​​into the groove, the contraction portion can prevent the splicing portion from escaping from the groove along the target surface direction.

10. A neutron target system for generating one of a neutron beam, a continuous neutron flux and a pulsed neutron flux, characterized in that: The invention comprises a rotating neutron target as claimed in any one of claims 5 to 9.

Images