Electron accelerator beam calibration water absorption target device

Abstract

The application relates to the technical field of accelerator beam calibration, in particular to an electron accelerator beam calibration water absorption target device, which comprises a suspension support, one end of the suspension support is provided with a mounting platform, and a calibration target is detachably mounted on the mounting platform; the calibration target comprises a water tank which is detachably mounted on the mounting platform, the water tank is filled with liquid medium which can absorb beam energy, and the water tank is free of air bubbles; the water tank is horizontally arranged along the propagation direction of the electron accelerator beam, and the cross section of the water tank is perpendicular to the beam incidence direction; a honeycomb array measurement partition in the form of a regular hexagon is formed in the water tank through a temperature insulation partition plate, and the honeycomb array measurement partition is further refined into independent interval areas in cooperation with a net-shaped partition, the regular hexagon is densely arranged, there is no measurement blind area, and the beam cross section can be completely covered; meanwhile, the length of all the partition edges is consistent with the volume, so that the reference of each measurement unit is unified.

Description

Technical Field

[0001] This application relates to the technical field of accelerator beam calibration, and in particular to a device for calibrating an electron accelerator beam to a water absorption target. Background Technology

[0002] In fields such as industrial production and healthcare, electron accelerators are widely used for applications such as irradiation sterilization and material modification due to their high-efficiency irradiation capabilities. Beam calibration and debugging are crucial steps before and during the operation of electron accelerators. The core of this process is to accurately measure parameters such as beam power and intensity using specialized equipment to ensure that the accelerator's output performance meets application requirements.

[0003] The water absorption target device is the core equipment used for energy absorption and parameter detection in this process. With the advantages of low cost of water medium, stable energy absorption law and good equivalence with human tissue, it has become the mainstream choice for beam calibration. Traditional water absorption target devices require manual handling throughout the process. During calibration, the device needs to be manually lifted to the designated position of the beam line (electron beam output path), and after calibration, the device needs to be manually moved out of the beam line.

[0004] Not only does it consume a lot of manpower, but if the device is temporarily stored near the cable tray when it is not in use, it will occupy the limited maintenance channel space; if it is completely transferred to other storage areas, it will increase the workload of repeated handling, resulting in a double loss of efficiency in terms of handling time and space occupation.

[0005] However, the aforementioned existing technologies still have some shortcomings when calibrating accelerator beam water absorption targets:

[0006] 1. In practical applications, if the accelerator is a high-power model (such as a high-power model used for large-scale industrial sterilization), or if the electron beam is pulsed (emitted in bursts), the water's endothermic reaction rate will be somewhat delayed. For example, when a pulsed electron beam releases a large amount of energy instantaneously, the water cannot dissipate the heat immediately, and local hot spots will form (for example, the water temperature suddenly spikes where the electron beam hits, while the surrounding area remains cool). In this case, the measured water temperature is not the average temperature, and the calculated electron beam energy will have an error.

[0007] 2. Water absorption targets can only calculate the overall power and total energy of the electron beam, but cannot know the energy distribution of the electron beam on the cross-section, such as whether the electron beam is strong in the middle and weak at both ends, or whether it is deflected. In some scenarios (such as medical radiotherapy), it is necessary not only to know the total energy, but also whether the energy distribution is uniform (otherwise it will lead to the patient's local absorbed dose being too high or too low).

[0008] Based on this, under the above viewpoints, there is still room for improvement in the existing technology for calibrating accelerator beam water absorption targets. Summary of the Invention

[0009] To address the aforementioned technical problems, this application provides an electron accelerator beam calibration water absorption target device, employing the following technical solution:

[0010] An electron accelerator beam calibration water absorption target device includes a suspension bracket, one end of which is provided with an installation platform on which a calibration target is detachably installed; the suspension bracket has a rotation and folding function to realize the transportation, positioning and attitude adjustment of the calibration target, so as to quickly switch the relative position of the calibration target and the electron accelerator beam and improve the beam calibration efficiency.

[0011] The calibration target includes a detachable water tank on the mounting platform, which is filled with a liquid medium that absorbs beam energy and is free of air bubbles. The water tank is arranged horizontally along the propagation direction of the electron accelerator beam, and its cross-section is perpendicular to the beam injection direction.

[0012] The calibration target adopts zoned measurement, and multiple temperature measuring units are set at intervals in the beam propagation direction of the water tank.

[0013] Preferably, the calibration target includes a partition plate installed inside the water tank, the partition plate dividing the interior of the water tank into multiple independent measurement zones, and the multiple measurement zones are evenly distributed along the beam propagation direction;

[0014] The partition is made of heat-insulating material to block heat transfer between different measurement zones and avoid temperature interference between zones.

[0015] Preferably, the water tank has a cavity located at the lower end of the partition plate, and the bottom of each measuring section is connected to the cavity;

[0016] A piston plate is slidably installed inside the cavity, and a push rod is installed at the bottom of the piston plate. The lower end of the push rod slides through to the bottom of the water tank. A reciprocating thread section is constructed on the push rod, and an adjusting gear that is threadedly engaged with the reciprocating thread section is rotatably installed at the bottom of the water tank.

[0017] Preferably, the measurement zones are hexagonal, and the hexagonal measurement zones are distributed in a regular hexagonal honeycomb array, with adjacent hexagonal measurement zones having equal side lengths and all hexagonal measurement zones having the same volume.

[0018] Preferably, a mesh partition is provided within the measurement zone, and the mesh partition is a hollow mesh structure;

[0019] Furthermore, the mesh partition is sealed to the inner wall of the measurement zone to form an interval area, and each interval area is independently sealed with no liquid exchange.

[0020] Preferably, the piston plate is provided with a seat pad corresponding to each measurement zone, and the seat pad is used to seal the bottom of the measurement zone.

[0021] Preferably, the seat cushion has mesh grooves corresponding to the mesh partitions.

[0022] Preferably, the seat cushion is provided with uprights that correspond one-to-one with the interval areas, and temperature sensors are provided at both ends of the uprights.

[0023] Preferably, the suspension bracket includes a suspension seat, one end of which is rotatably provided with a connecting frame, and the mounting platform is detachably mounted on one end of the connecting frame.

[0024] Preferably, a lead screw is provided between the rotation point of the suspension seat and the connecting frame, a drive gear is provided on the lead screw, and a transmission gear that rotates on the suspension seat is connected to the drive gear.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. This invention uses a hexagonal honeycomb array to form measurement zones within the water tank via thermal insulation partitions. These zones are further subdivided into independent intervals using mesh partitions. The densely packed hexagonal structure eliminates measurement blind spots, ensuring complete coverage of the beam cross-section. Simultaneously, all zones have the same side length and volume, ensuring consistent reference values ​​for each measurement unit. Temperature sensors at both ends of the support pole synchronously collect the temperatures at the top and bottom of the intervals, avoiding the randomness of single-location temperature measurements. Combined with thermal insulation materials, this blocks thermal interference between the intervals, ensuring that the temperature change in each interval is determined solely by the beam energy it absorbs, providing accurate temperature data for energy calculations.

[0027] 2. This invention, through a hybrid structure consisting of a cavity, a piston plate, and an adjusting gear, can quickly eliminate the temperature difference between zones between multiple tests. After the first test, even if there is a significant water temperature difference between the zones near the beam inlet and outlet, the reciprocating liquid circulation driven by the piston plate can make the water temperature in all interval zones tend to be consistent, establishing a unified initial benchmark for subsequent tests. This avoids interference with temperature rise calculation due to initial temperature difference compensation, ensuring the comparability and authenticity of multiple test data. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention.

[0029] Figure 2 This is a schematic diagram of the structure of the water tank of the present invention.

[0030] Figure 3 This is a schematic diagram of the structure between the separator plate and the measurement zone of the present invention.

[0031] Figure 4 This is a cross-sectional view of the water tank of the present invention.

[0032] Figure 5 This is a cross-sectional plan view of the water tank of the present invention.

[0033] Figure 6This is a schematic diagram of the structure between the mesh partition and the interval area of ​​the present invention.

[0034] Figure 7 This is a planar schematic diagram of the mesh partition and the interval area of ​​the present invention.

[0035] Figure 8 This is a schematic diagram of the structure between the piston plate and the seat cushion of the present invention.

[0036] Figure 9 This is a schematic diagram of the structure between the seat cushion and the upright of the present invention.

[0037] Figure 10 This is a schematic diagram of the suspension bracket of the present invention.

[0038] Explanation of reference numerals in the attached drawings: 1. Suspension bracket; 11. Suspension seat; 12. Connecting frame; 13. Lead screw; 14. Drive gear; 15. Transmission gear; 2. Mounting platform; 3. Calibration target; 31. Water tank; 32. Cover plate; 33. Divider plate; 331. Measurement zone; 34. Cavity; 341. Piston plate; 35. Push rod; 351. Reciprocating thread section; 36. Adjusting gear; 37. Mesh partition; 371. Interval area; 38. Seat cushion; 381. Mesh groove; 39. Upright pole; 391. Temperature sensor. Detailed Implementation

[0039] The following is in conjunction with the appendix Figures 1 to 10 This application will be described in further detail.

[0040] This application discloses an electron accelerator beam calibration water absorption target device. Through structural design and process optimization such as partitioning, mixing and homogenization, and precise positioning, it achieves advantages such as high measurement accuracy, high operation efficiency, strong flexibility of use, and convenient maintenance. It can reliably complete the calibration of beam energy attenuation law and cross-sectional power distribution.

[0041] Reference Figure 1 , Figure 2 and Figure 3 As shown, an electron accelerator beam calibration water absorption target device includes a suspension bracket 1, with an installation platform 2 at one end of the suspension bracket 1. A calibration target 3 is detachably mounted on the installation platform 2. The installation platform 2 is a flat plate structure with a connection structure on its surface that matches the calibration target 3, ensuring that the calibration target 3 can be detachably mounted on it. When it is necessary to replace or maintain the calibration target 3, the connection structure can be quickly disconnected to complete the disassembly and assembly of the calibration target 3. During the calibration process, the connection structure can stably fix the calibration target 3, preventing displacement of the calibration target 3 due to beam impact or environmental vibration.

[0042] The suspension bracket 1 has a rotating and folding function, which is used to realize the transportation, positioning, and attitude adjustment of the calibration target 3, so as to quickly switch the relative position of the calibration target 3 and the electron accelerator beam and improve the beam calibration efficiency. The suspension bracket 1 can be stably connected to the wall or fixed platform of the experimental site to ensure that the whole device does not shake during use. The main body of the suspension bracket 1 includes a rotatable component and a foldable component: one end of the rotatable component is hinged to the fixed component and can rotate around the hinge point on the horizontal plane to realize the horizontal position adjustment of the calibration target 3.

[0043] One end of the foldable component is connected to the end of the rotatable component away from the fixed part, and the other end is fixed to the mounting platform 2. The height and tilt angle of the mounting platform 2 can be changed by the folding action, thereby realizing the attitude adjustment of the calibration target 3.

[0044] The calibration target 3 includes a detachable water tank 31 on the mounting platform 2. The water tank 31 is arranged horizontally along the propagation direction of the electron accelerator beam, and its cross-section is perpendicular to the beam injection direction. The shape and size of the water tank 31 are adapted to the propagation path of the electron accelerator beam. One end of the water tank is the beam injection end, and the other end is the beam emission end (or beam energy attenuation end), ensuring that the beam can completely pass through the liquid medium inside the water tank 31.

[0045] The water tank 31 is provided with a cover plate 32 at the top. The cover plate 32 is detachably and sealed to the main body of the water tank 31 (such as by using a sealing strip with a buckle connection or a threaded connection). This not only ensures the sealing of the water tank 31 and prevents the leakage of liquid medium or the entry of external impurities, but also facilitates the subsequent opening of the cover plate 32 for maintenance of the temperature measuring unit, replenishment of liquid medium, or cleaning of the inside of the water tank 31.

[0046] The cover plate 32 is made of transparent material; the state of the liquid medium inside the water tank 31 can be directly observed through the transparent cover plate 32 (such as whether there are bubbles or signs of leakage), which is convenient for pre-experiment condition checks and abnormal monitoring during the experiment; on the other hand, the transparent material does not affect the observation of the inside of the water tank 31 by external ambient light or auxiliary monitoring equipment (such as high-speed cameras). If it is necessary to combine visualization methods to assist in the analysis of the interaction between the beam and the liquid medium, the transparent cover plate 32 can provide good observation conditions and will not cause additional interference to the beam propagation (the material itself does not absorb or absorbs very little electron accelerator beam energy).

[0047] The water tank 31 is filled with a liquid medium (preferably deionized water) that absorbs beam energy, and there are no air bubbles inside the water tank 31. The liquid medium is injected directly into the water tank 31 by opening the transparent cover 32 at the top of the water tank 31. During the filling process, the liquid level and air bubble situation can be observed in real time through the transparent cover 32, which facilitates timely removal of air bubbles. Alternatively, the original liquid injection channel and air venting channel of the water tank 31 can be retained. During filling, there is no need to open the cover 32. Liquid is injected through the liquid injection channel and air is discharged through the air venting channel. After filling is completed, the channel is sealed by a sealing component.

[0048] At this point, it can be confirmed through the transparent cover 32 that there are no air bubbles remaining inside. Both methods can ensure that there are no air bubbles inside the water tank 31, avoiding air bubbles from hindering beam propagation and causing uneven absorption of beam energy by the liquid medium, which in turn affects the temperature measurement accuracy. After filling is completed, if the cover 32 filling method is used, the cover 32 needs to be reset and sealed; if the channel filling method is used, the cover 32 can simply be kept closed.

[0049] After the water tank 31 is installed on the mounting platform 2, the rotation and folding components of the suspension bracket 1 are adjusted to ensure that the water tank 31 is horizontally arranged along the propagation direction of the electron accelerator beam, and that the cross-section of the water tank 31 is perpendicular to the beam injection direction. Horizontal arrangement avoids natural convection of the liquid medium due to gravity, preventing temperature interference between different zones; the perpendicularity of the cross-section to the beam injection direction ensures that the beam acts perpendicularly on the cross-section of the water tank 31, resulting in a uniform distribution of beam energy within the cross-section and providing stable energy absorption conditions for zoned measurements. Simultaneously, the transparent cover 32 at the top of the water tank 31 remains horizontal to prevent localized accumulation of liquid medium due to tilting of the cover 32, or to avoid affecting the observation results.

[0050] The calibration target 3 adopts zone measurement, and multiple temperature measurement units are set at intervals along the beam propagation direction of the water tank 31. The temperature measurement units are used to synchronously collect the real-time temperature of the liquid medium in the corresponding zone. By comparing the temperature changes of each zone before and after beam irradiation, and combining parameters such as the specific heat capacity and mass of the liquid medium, the energy attenuation law of the accelerator beam along the propagation direction and the power intensity distribution on the cross section are calculated.

[0051] After the beam irradiation ends, the data processing equipment calculates the beam energy absorbed by the liquid medium in each zone based on the temperature change of each zone, combined with known parameters such as the specific heat capacity of the liquid medium and the mass of the liquid medium in the corresponding zone, using an energy conversion formula. Based on the positional relationship of each zone along the beam propagation direction, the energy attenuation law of the electron accelerator beam along the propagation direction can be derived. Simultaneously, by analyzing the temperature changes in different regions within the cross-section of water tank 31 (considering the structural characteristics of the cross-section of water tank 31; if further assessment is needed, the state of the liquid within the cross-section can be observed through the transparent cover 32), the power intensity distribution on the beam cross-section can be further obtained.

[0052] Reference Figure 3 , Figure 4 and Figure 5 As shown, specifically, the calibration target 3 includes a partition plate 33 installed inside the water tank 31. The partition plate 33 divides the interior of the water tank 31 into multiple independent measurement zones 331, and the multiple measurement zones 331 are evenly distributed along the beam propagation direction. This allows the beam to pass through each independent zone in sequence during propagation, and each zone can independently correspond to different positions on the beam propagation path, providing a structural basis for subsequent accurate measurement of energy absorption at each position.

[0053] The separator 33 is made of thermal insulation material to block heat transfer between different measurement zones 331 and avoid temperature interference between zones. Since each zone will experience temperature changes due to energy absorption during beam irradiation, the thermal insulation material can effectively prevent heat conduction between adjacent zones due to temperature differences, preventing heat from one zone from spreading to other zones. This fundamentally avoids temperature interference between zones and ensures that the temperature change of each measurement zone 331 is determined only by the beam energy absorbed by that zone itself, providing accurate temperature data support for subsequent calculation of beam energy based on temperature changes.

[0054] The water tank 31 has a cavity 34 located at the lower end of the partition plate 33. The cavity 34 is an integral hollow area at the bottom of the water tank 31, and the bottom of all measurement zones 331 are connected to the cavity 34.

[0055] A piston plate 341 is slidably disposed inside the cavity 34. A push rod 35 is disposed at the bottom of the piston plate 341. The lower end of the push rod 35 slides through to the bottom of the water tank 31. A reciprocating thread section 351 is constructed on the push rod 35. An adjusting gear 36 is rotatably disposed at the bottom of the water tank 31, which is threadedly engaged with the reciprocating thread section 351.

[0056] When the adjusting gear 36 is driven to rotate around its own axis by an external driving force (such as manually rotating the adjusting gear 36 or driving the adjusting gear 36 to rotate by a motor), since the adjusting gear 36 and the reciprocating threaded section 351 of the push rod 35 are threadedly engaged, and the push rod 35 is restricted by the piston plate 341 and the inner wall of the cavity 34 and cannot rotate synchronously with the adjusting gear 36 (it can only slide in the vertical direction), the rotational motion of the adjusting gear 36 will be converted into the linear reciprocating motion of the push rod 35 through the threaded pair: when the adjusting gear 36 rotates clockwise, the reciprocating threaded section 351 drives the push rod 35 to move upward in the vertical direction, thereby pushing the piston plate 341 to slide upward in the cavity 34.

[0057] When the piston plate 341 slides upward, it squeezes the liquid in the cavity 34, forcing the liquid to flow back into the corresponding measurement zone 331 through the connecting port at the bottom of each measurement zone 331. When the adjusting gear 36 rotates counterclockwise, the reciprocating thread section 351 drives the push rod 35 to move downward in the vertical direction, and the piston plate 341 slides down accordingly, creating a negative pressure in the cavity 34. The liquid in each measurement zone 331 flows into the cavity 34 through the connecting port. By continuously rotating the adjusting gear 36 in both directions, the push rod 35 can be forced to drive the piston plate 341 to move back and forth in the cavity 34, so that the liquid circulates between the cavity 34 and each measurement zone 331, ultimately achieving the mixing of water in multiple measurement zones 331.

[0058] The purpose of mixing is that during the first accelerator beam calibration test, the beam energy gradually decays along the propagation direction, resulting in different energy absorption in each measurement zone 331. Zones closer to the beam inlet absorb more energy and experience a significant increase in water temperature, while zones farther from the inlet absorb less energy and experience a slight increase in water temperature, ultimately forming a significant temperature difference between zones. If this temperature difference is not addressed before the second test, the initial temperatures of each zone will be inconsistent. When calculating the temperature rise during the second test, it will be impossible to distinguish whether the temperature change is caused by beam energy absorption or by the initial temperature difference compensation, directly compromising the accuracy of the test data.

[0059] By driving the adjusting gear 36 to move the piston plate 341 back and forth, the water in each zone can be circulated and mixed through the cavity 34. After the hot water in the high-temperature zone flows into the cavity 34, it is fully mixed with the cold water in the low-temperature zone, and then it is squeezed back to each zone by the piston. Finally, the water temperature of all measurement zones 331 tends to be consistent. At this time, each zone has the same initial temperature, which establishes a unified baseline for secondary detection and ensures that subsequent temperature changes are determined by the single factor of beam energy absorption during secondary detection.

[0060] In scenarios requiring repeated beam calibration (such as verifying accelerator stability and recalibrating after adjusting beam parameters), there is no need to replace the water in water tank 31 before each test (replacing water increases operation time and introduces new temperature fluctuations). This structure achieves rapid temperature homogenization, allowing the next test to proceed immediately. This improves experimental efficiency, avoids initial state differences caused by water changes, ensures the comparability and accuracy of multiple test data, and ultimately accurately identifies the beam energy change pattern by observing the temperature rise from the initial temperature after homogenization to the temperature after testing, providing reliable and continuous data support for accelerator beam calibration.

[0061] Measurement zones 331 are hexagonal, arranged in a regular hexagonal honeycomb array. Adjacent hexagonal measurement zones 331 have equal side lengths and identical volumes. Specifically, a regular hexagonal measurement zone 331 at the center of the water tank 31's cross-section serves as the core, with the remaining regular hexagonal measurement zones 331 arranged sequentially around it. The sides of adjacent zones fit together, forming a seamless, fully covered honeycomb structure. The advantage of this distribution is that the geometric characteristics of the regular hexagon allow for close tiling within a plane, maximizing the use of the water tank 31's cross-sectional space, avoiding space waste caused by the zone shape, and ensuring that every point of energy within the beam cross-section is captured by its corresponding measurement zone 331, eliminating measurement blind spots.

[0062] Meanwhile, all hexagonal measurement zones 331 have equal side lengths: whether it is a zone in the central region or a zone in the edge region, the six sides of its regular hexagon are completely consistent. Combined with the distribution logic of the regular hexagonal cellular array, equal side lengths ensure that adjacent zones fit tightly without any extra gaps, further improving the coverage integrity of the cross-section; and consistent side lengths are the basic geometric condition for achieving consistent volume of all zones in the future.

[0063] Reference Figure 6 and Figure 7 As shown, a mesh partition 37 is provided in the measurement partition 331. The mesh partition 37 is a hollow mesh structure, and its material is selected from inert materials with high temperature resistance and low thermal conductivity (preferably ceramic mesh, quartz mesh, or polytetrafluoroethylene mesh). The mesh partition 37 is sealed to the inner wall of the measurement partition 331 to form an interval area 371. Each interval area 371 is independently sealed and there is no liquid communication between them.

[0064] The mesh openings of the mesh partition 37 are regularly distributed (such as square or regular hexagonal mesh openings), and the mesh size is set according to the detection accuracy requirements (usually, it is necessary to balance the refinement of the partitions with the beam penetration, and avoid the mesh openings being too small to hinder the beam propagation). The mesh partition 37 is arranged in a specific direction within the hexagonal measurement partition 331: multiple layers can be set at intervals along the beam propagation direction (axial direction), subdividing a single hexagonal measurement partition 331 into multiple sub-partitions along the beam path along the axial direction; or it can be set along a direction perpendicular to the beam propagation direction (radial direction), subdividing a single hexagonal measurement partition 331 into multiple annular or fan-shaped sub-partitions along the radial direction.

[0065] A single hexagonal measurement zone 331 is subdivided into multiple independent sub-spacing zones 371, each sub-spacing zone 371 corresponding to a smaller spatial range, which can capture the details of the energy distribution of the beam in the microscopic space and greatly improve the spatial resolution of the beam energy distribution.

[0066] Reference Figure 7 , Figure 8 and Figure 9As shown, the piston plate 341 is provided with a seat 38 corresponding to each measurement partition 331. The seat 38 is used to seal the bottom of the measurement partition 331. The seat 38 is made of elastic material (preferably high-temperature resistant silicone or fluororubber), and its shape is perfectly adapted to the bottom opening contour of the hexagonal measurement partition 331. The thickness of the seat 38 is slightly greater than the distance between the piston plate 341 and the bottom of the measurement partition 331. When the piston plate 341 slides upward to its limit position, the seat 38 will tightly fit the bottom opening of the measurement partition 331, thereby sealing the bottom of the measurement partition 331 and preventing the liquid in the measurement partition 331 from flowing into the cavity 34. When the piston plate 341 slides downward, the seat 38 separates from the bottom opening of the measurement partition 331, and the liquid can flow between the measurement partition 331 and the cavity 34 through the opening.

[0067] The seat cushion has mesh grooves 381 corresponding to the mesh partitions 37. The shape and size of the mesh holes in the mesh grooves 381 are exactly the same as those in the mesh partitions 37, and the distribution of the mesh grooves 381 corresponds one-to-one with the arrangement of the mesh partitions 37 within the measurement zone 331. When the seat cushion 38 blocks the bottom of the measurement zone 331, the mesh grooves 381 and the mesh partitions 37 form vertically aligned hollow channels, which do not hinder the vertical propagation of the beam (the beam can pass through the mesh holes of the mesh grooves 381 and the mesh partitions 37), and can maintain the independence of the sub-spacing zones 371 within the measurement zone 331 in the blocked state. When the piston plate 341 moves the seat cushion 38 downward and the liquid flows, the mesh grooves 381 can increase the liquid flow area, ensuring that the liquid in each sub-spacing zone 371 can quickly flow into the cavity 34, improving the mixing efficiency.

[0068] The seat cushion is equipped with uprights 39 that correspond one-to-one with the intervals 371, and temperature sensors 391 are installed at both ends of the uprights 39. The axis of the uprights 39 coincides with the central axis of the corresponding intervals 371, ensuring that the uprights 39 can accurately extend into the interior of the intervals 371 without colliding with the inner wall of the intervals 371 or the mesh partitions 37.

[0069] Before beam irradiation, all temperature sensors 391 are activated to synchronously collect the initial temperature at the top and bottom of each interval 371. Since the liquid medium in the interval 371 has a uniform temperature after mixing and homogenization, the initial temperature at the top and bottom of the same interval 371 should be basically the same, and the average of the two can be taken as the initial reference temperature of the interval 371.

[0070] The electron accelerator is activated, and the beam passes through each spacer 371 along the propagation direction. The liquid medium absorbs the beam energy and its temperature rises. During irradiation, sensors collect the temperature at the top and bottom of the spacer 371 in real time and transmit the data to the terminal processor.

[0071] Based on the temperature change of the same interval 371, the average of the two values ​​is taken as the overall temperature rise of the interval 371 (combined with the specific heat capacity of the liquid medium and the liquid mass corresponding to the volume of the interval 371), and the beam energy absorbed by the interval 371 is calculated.

[0072] Reference Figure 10 As shown, specifically, the suspension bracket 1 includes a suspension seat 11, with a connecting frame 12 rotatably mounted at one end of the suspension seat 11. The mounting platform 2 is detachably mounted on one end of the connecting frame 12. A lead screw 13 passes between the rotation points of the suspension seat 11 and the connecting frame 12. A drive gear 14 is mounted on the lead screw 13, and a transmission gear 15, which is rotatably mounted on the suspension seat 11, interacts with the drive gear 14. When the knob is turned or the motor is started to drive the transmission gear 15 to rotate, the transmission gear 15 drives the drive gear 14 to rotate synchronously through gear meshing, thereby driving the lead screw 13, which is fixedly connected to the drive gear 14, to rotate.

[0073] Since one end of the lead screw 13 is rotatably connected to the suspension seat 11 (it can only rotate and cannot move axially), and the connecting frame 12 and the lead screw 13 are connected by a thread and are restricted by the rotating shaft to only rotate around the rotation point, the rotational motion of the lead screw 13 is converted into the rotational motion of the connecting frame 12 around the rotating shaft through the threaded pair. If the transmission gear 15 rotates clockwise, the drive gear 14 and the lead screw 13 rotate clockwise synchronously, and the connecting frame 12 rotates upward around the rotating shaft under the action of the thread thrust, causing the mounting platform 2 and the calibration target 3 to be lifted upward; if the transmission gear 15 rotates counterclockwise, the connecting frame 12 rotates downward around the rotating shaft, causing the mounting platform 2 and the calibration target 3 to be pressed downward.

[0074] By controlling the rotation angle of the transmission gear 15 (which can be determined by the knob scale when manually driven, and precisely controlled by the motor encoder when driven by a motor), the rotation angle of the connecting frame 12 can be precisely adjusted, thereby adjusting the tilt posture of the mounting platform 2 and the calibration target 3 (such as adjusting the horizontality and verticality of the calibration target 3 and the beam propagation direction), ensuring that the calibration target 3 is arranged horizontally along the beam propagation direction and that its cross-section is perpendicular to the beam injection direction, thus meeting the measurement accuracy requirements.

[0075] The implementation principle of this invention is as follows:

[0076] Step 1: Drive the connecting frame 12 to rotate and fold through the lead screw 13 and gear transmission, adjust the position and attitude of the installation platform 2 and the calibration target 3, and ensure that the water tank 31 is arranged horizontally along the beam propagation direction and the cross-section is perpendicular to the beam injection end, so as to provide a basis for the beam to accurately pass through the water tank 31.

[0077] Step 2: Inside the water tank 31, a hexagonal honeycomb array measurement zone 331 is formed by a heat-insulating partition plate 33. Within each zone, a mesh partition 37 is added to further refine the zone into independent interval zones 371. Temperature sensors 391 at both ends of the upright 39 synchronously collect the temperature at the top and bottom of each interval zone 371. The beam energy absorbed by the interval zone 371 is calculated by the temperature difference before and after irradiation. The structure of the lower cavity 34 and the piston plate 341 can achieve liquid mixing in each zone, eliminate the initial temperature difference between multiple tests, and ensure a consistent measurement benchmark.

[0078] Step 3: If there is a temperature difference between zones during the first test or after the last test, the adjusting gear 36 needs to be driven to achieve liquid mixing: The adjusting gear 36 at the bottom of the water tank 31 is rotated manually or by motor. The adjusting gear 36 cooperates with the reciprocating thread section 351 of the push rod 35, which drives the push rod 35 and the piston plate 341 to move back and forth in the cavity 34. When the piston plate 341 moves upward, it squeezes the liquid in the cavity 34 to each zone. When it moves downward, it draws the liquid in the zone into the cavity 34, forming a circulating flow, so that the water temperature in each interval zone 371 tends to be uniform.

[0079] Step 4: When the beam passes through the water tank 31, it enters the interval 371 of each regular hexagonal measurement zone 331 in sequence. The liquid medium absorbs the beam energy and its temperature rises. The temperature sensors 391 at both ends of the pole 39 capture the top and bottom temperatures of each interval 371 in real time. The data is transmitted to the terminal processor in real time through the cable to record the temperature change curve during the irradiation process.

[0080] Step 5: During irradiation, the seat pad 38 on the piston plate 341 tightly seals the bottom of the measurement zone 331. The mesh groove 381 of the seat pad 38 and the piston plate 341 are aligned with the mesh partition 37 to form a hollow channel. This not only does not obstruct the vertical passage of the beam, but also avoids heat conduction between adjacent interval zones 371 due to temperature differences through the heat insulation characteristics of the mesh partition 37, ensuring that the temperature change of each interval zone 371 is determined only by the beam energy absorbed by itself.

[0081] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An electron accelerator beam calibration water absorption target device, comprising a suspension bracket (1), characterized in that: One end of the suspension bracket (1) is provided with an installation platform (2), on which a calibration target (3) is detachably installed; the suspension bracket (1) has a rotation and folding function, which is used to realize the transportation, positioning and attitude adjustment of the calibration target (3) so as to quickly switch the relative position of the calibration target (3) and the electron accelerator beam; The calibration target (3) includes a detachable water tank (31) on the mounting platform (2). The water tank (31) is filled with a liquid medium that absorbs beam energy, and there are no air bubbles inside the water tank (31). The water tank (31) is arranged horizontally along the propagation direction of the electron accelerator beam, and its cross-section is perpendicular to the beam injection direction. The calibration target (3) adopts zone measurement, and multiple measurement zones (331) are set at intervals in the beam cross-section direction of the water tank (31). The calibration target (3) includes a partition plate (33) installed inside the water tank (31), which divides the interior of the water tank (31) into multiple independent measurement zones (331), and the multiple measurement zones (331) are evenly distributed along the beam cross-section direction; The partition plate (33) is made of heat-insulating material to block heat transfer between different measurement zones (331) and avoid temperature interference between the zones.

2. The electron accelerator beam calibration water absorption target device according to claim 1, characterized in that: The water tank (31) is provided with a cavity (34) located at the lower end of the partition plate (33), and the bottom of the measuring section (331) is connected to the cavity (34); A piston plate (341) is slidably disposed inside the cavity (34). A push rod (35) is disposed at the bottom of the piston plate (341). The lower end of the push rod (35) slides through to the bottom of the water tank (31). A reciprocating thread section (351) is constructed on the push rod (35). An adjusting gear (36) that is threadedly engaged with the reciprocating thread section (351) is rotatably disposed at the bottom of the water tank (31).

3. The electron accelerator beam calibration water absorption target device according to claim 1, characterized in that: The measurement partitions (331) are hexagonal, and the measurement partitions (331) are distributed in a regular hexagonal honeycomb array. The side lengths of adjacent hexagonal measurement partitions (331) are equal, and the volume of all hexagonal measurement partitions (331) is consistent.

4. The electron accelerator beam calibration water absorption target device according to claim 1, characterized in that: A mesh partition (37) is provided in the measurement zone (331), and the mesh partition (37) is a hollow mesh structure; Furthermore, the mesh partition (37) is sealed to the inner wall of the measurement zone (331) to form a spacer area (371), and each spacer area (371) is independently sealed and there is no liquid communication.

5. The electron accelerator beam calibration water absorption target device according to claim 4, characterized in that: The piston plate (341) is provided with a seat pad (38) corresponding to the measurement zone (331) one by one. The seat pad (38) is used to seal the bottom of the measurement zone (331).

6. The electron accelerator beam calibration water absorption target device according to claim 5, characterized in that: The seat cushion has mesh grooves (381) corresponding to the mesh partition (37).

7. The electron accelerator beam calibration water absorption target device according to claim 4, characterized in that: The seat cushion is provided with uprights (39) that correspond one-to-one with the interval area (371), and temperature sensors (391) are provided at both ends of the uprights (39).

8. The electron accelerator beam calibration water absorption target device according to claim 1, characterized in that: The suspension bracket (1) includes a suspension seat (11), and a connecting frame (12) is rotatably provided at one end of the suspension seat (11). The mounting platform (2) is detachably installed at one end of the connecting frame (12).

9. The electron accelerator beam calibration water absorption target device according to claim 1, characterized in that: A lead screw (13) is inserted between the rotation point of the suspension seat (11) and the connecting frame (12). A drive gear (14) is provided on the lead screw (13). A transmission gear (15) that meshes with the drive gear (14) is rotatably provided on the suspension seat (11).

Images