Four-wing radio frequency quadrupole accelerator field distribution measurement device

Abstract

The present application provides a four-wing radio frequency quadrupole accelerator field distribution measurement device, including a support part, a perturbation body, a driving part and a detection part, wherein the support part is used to connect with the accelerator cavity to fix the accelerator cavity and set the axis of the accelerator cavity vertically, the perturbation body is set in the accelerator cavity, the perturbation body is connected to the driving part, the driving part is used to drive the perturbation body to move along the axial direction of the accelerator cavity in the accelerator cavity, and the detection part is connected to the accelerator cavity and the driving part respectively. By connecting the support part with the accelerator cavity and setting the axis of the accelerator cavity vertically, the position error introduced by the droop of the perturbation body due to the influence of gravity is avoided, the positioning accuracy of the perturbation body in the accelerator cavity is ensured, thereby eliminating the measurement error caused by gravity when measuring the accelerator cavity, and greatly improving the measurement accuracy of the electromagnetic field distribution of the four-wing radio frequency quadrupole accelerator cavity.

Description

Technical Field

[0001] The present application belongs to the technical field of ion accelerators, and in particular relates to a four-wing radio frequency quadrupole accelerator field distribution measurement device. Background Art

[0002] Radio frequency quadrupole (RFQ) accelerators have played a huge role in promoting the performance improvement and rapid development of particle accelerators due to their excellent performance in accelerating low-energy beams. RFQ accelerators integrate beam acceleration, focusing and bunching. Since its focusing ability is independent of the speed of charged particles, it is very suitable for accelerating low-energy beams. It is generally used as an injector for medium and high energy accelerators, and can also be used to build a low-energy beam application platform alone.

[0003] The main types of RFQ accelerator cavity structures are four-rod type and four-wing type. Since the cooling structure of the four-wing RFQ accelerator cavity has the advantages of simplicity and sufficient cooling, the RFQ accelerator working in the continuous wave (CW) mode usually adopts the four-wing structure; in addition, the four-wing RFQ accelerator cavity structure also has the advantages of good field symmetry and high output beam quality in RF performance. Therefore, the four-wing RFQ accelerator cavity structure is widely used. The four-wing RFQ accelerator cavity structure consists of four wing-shaped electrodes evenly and symmetrically distributed in the cavity wall and the cavity interior. The cavity wall and the four wing-shaped electrodes form four quadrants. Since the electromagnetic field coupling strength between the four quadrants of the four-wing RFQ accelerator cavity is extremely weak, a small error during processing (such as 20um) will cause the field symmetry between the four quadrants to deteriorate, thereby reducing the beam quality; at the same time, a longer cavity length (>2m) will also cause the flatness of the electromagnetic field along the beam transmission direction to decrease. Therefore, in order to ensure that the cavity processing accuracy meets the requirements of field symmetry and flatness, low-power measurement of the field distribution of the four-wing RFQ accelerator cavity is required before welding the cavity wall and the electrode.

[0004] At present, low-power measurements of four-wing RFQ accelerator cavities at home and abroad generally adopt the horizontal measurement method, that is, the cavity is placed horizontally during measurement, the beam channel of the cavity is parallel to the ground, and the measurement end caps of the cavity are at the left and right ends of the cavity. The horizontal measurement method has an inherent defect, that is, the perturbation body is affected by gravity during measurement, and its positioning in the four quadrants is asymmetric around the beam channel, thereby introducing the positioning error of the perturbation body when measuring the field symmetry and flatness, resulting in inaccurate measurement results. Although people have used various methods to reduce the influence of gravity on the measurement results, such as using lightweight perturbations or tightening the perturbation body carrier line, these methods cannot fundamentally solve the inherent defects of the horizontal measurement method. As people's requirements for the field distribution of four-wing RFQ accelerators become more and more stringent, and the requirements for the field measurement accuracy of four-wing RFQ accelerator cavities become higher and higher, the horizontal measurement method can no longer meet the field distribution measurement requirements of four-wing RFQ accelerator cavities, and it is urgent to study new low-power measurement methods. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present application is to provide a four-wing radio frequency quadrupole accelerator field distribution measurement device, which can solve the problem of asymmetric positioning of the perturbation body due to the influence of gravity, thereby leading to inaccurate results of measuring field symmetry and flatness, and improve the accuracy of field distribution measurement.

[0006] In order to solve the above problems, the present application provides a four-wing radio frequency quadrupole accelerator field distribution measurement device, including a support part, a perturbation body, a driving part and a detection part, the support part is used to connect with the accelerator cavity to fix the accelerator cavity and make the axis of the accelerator cavity vertically arranged, the perturbation body is arranged in the accelerator cavity, the perturbation body is connected to the driving part, the driving part is used to drive the perturbation body to move in the accelerator cavity along the axial direction of the accelerator cavity, and the detection part is respectively connected to the accelerator cavity and the driving part.

[0007] Optionally, the support portion includes a bracket, an upper end cover and a lower end cover, the accelerator cavity is arranged on the bracket, the upper end cover is arranged on the upper end surface of the accelerator cavity, and the lower end cover is arranged on the lower end surface of the accelerator cavity.

[0008] Optionally, the upper end cover is matched with the upper end surface of the accelerator cavity, and the lower end cover is matched with the lower end surface of the accelerator cavity to close the internal space of the accelerator cavity.

[0009] Optionally, the perturbation body is arranged on a connecting line and is connected to the driving part through the connecting line. The upper end cover is provided with a first via hole, and the lower end cover is provided with a second via hole. The connecting line passes through the accelerator cavity via the first via hole and the second via hole.

[0010] Optionally, the connecting line is closed into a loop, the driving portion includes a driving member, and the connecting line is connected to an output end of the driving member.

[0011] Optionally, the driving part also includes an upper support member and a lower support member, the upper support member is arranged on the upper end cover, the lower support member is arranged on the lower end cover, the driving member is arranged on the upper support member and / or the lower support member, and transmission pulleys are arranged on the upper support member and the lower support member, and the connecting line is slidably arranged on the transmission pulley.

[0012] Optionally, the four-wing radio frequency quadrupole accelerator field distribution measurement device also includes an upper positioning portion and a lower positioning portion, the upper positioning portion is arranged on the upper end cover, the upper support member is arranged on the upper positioning portion, the upper positioning portion is used to drive the upper support member to move along the first direction and the second direction, the lower positioning portion is arranged on the lower end cover, the lower support member is arranged on the lower positioning portion, the lower positioning portion is used to drive the lower support member to move along the first direction and the second direction, the first direction is perpendicular to the second direction, and both are perpendicular to the axial direction of the accelerator cavity.

[0013] Optionally, the upper positioning portion includes a first slide rail and a second slide rail, the first slide rail is vertically arranged with respect to the second slide rail, the first slide rail is arranged on the upper end cover, the second slide rail is slidably arranged on the first slide rail, and the upper support member is slidably arranged on the second slide rail;

[0014] The lower positioning portion includes a third slide rail and a fourth slide rail, the third slide rail is vertically arranged with the fourth slide rail, the third slide rail is arranged on the lower end cover, the fourth slide rail is slidably arranged on the third slide rail, and the lower support member is slidably arranged on the fourth slide rail.

[0015] Optionally, the connecting wire is made of aramid fiber material or nylon; and the perturbation body is spherical or cylindrical.

[0016] Optionally, the detection unit includes a frequency measurement device and a data acquisition system, the accelerator cavity is provided with a sampling port, the frequency measurement device is connected to the sampling port, and the data acquisition system is respectively connected to the frequency measurement device and the driving unit.

[0017] Beneficial Effects

[0018] A four-wing radio frequency quadrupole accelerator field distribution measurement device provided in an embodiment of the present invention is connected to the accelerator cavity through a support part, and the axis of the accelerator cavity is vertically arranged, so as to avoid the position error introduced by the droop of the perturbation body under the influence of gravity, and ensure the positioning accuracy of the perturbation body in the accelerator cavity, thereby eliminating the measurement error caused by gravity when measuring the accelerator cavity, and greatly improving the electromagnetic field distribution measurement accuracy of the four-wing radio frequency quadrupole accelerator cavity. By setting the perturbation body in the accelerator cavity and connecting it to the driving part, the driving part can drive the perturbation body to move axially in the accelerator cavity. This arrangement enables the perturbation body to move more accurately to the position required to be measured in the accelerator cavity, and can obtain field distribution information at different positions more accurately than the situation of being disturbed by gravity in the horizontal measurement method. By connecting the detection part to the accelerator cavity and the driving part respectively, it can better cooperate with the movement of the perturbation body for data collection and analysis, thereby improving the accuracy of the entire field distribution measurement, and more accurately reflecting the field symmetry and flatness of the four-wing radio frequency quadrupole accelerator cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of a four-wing radio frequency quadrupole accelerator field distribution measurement device according to an embodiment of the present application;

[0020] Figure 2 This is an exploded view of the upper end cover, accelerator cavity and lower end cover of an embodiment of the present application.

[0021] The reference numerals are:

[0022] 1. Accelerator cavity; 2. Bracket; 3-1. Upper end cover; 3-2. Lower end cover; 4. Perturbation body; 5. Transmission pulley; 6. Driving member; 7-1. Upper support member; 7-2. Lower support member; 8. Connecting wire; 9-1. Upper positioning part; 9-2. Lower positioning part; 10. Frequency measurement equipment; 11. Data acquisition system; 12. Sampling port. DETAILED DESCRIPTION

[0023] In the description of the present application, it should 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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 a limitation on the present invention.

[0024] 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 one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] In this application, 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 connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0027] See also Figure 1 to Figure 2 As shown, according to an embodiment of the present application, a four-wing radio frequency quadrupole accelerator field distribution measurement device is provided, including a support portion, a perturbation body 4, a driving portion and a detection portion, the support portion is used to connect with the accelerator cavity 1 to fix the accelerator cavity 1 and make the axis of the accelerator cavity 1 vertically arranged, the perturbation body 4 is arranged in the accelerator cavity 1, the perturbation body 4 is connected to the driving portion, the driving portion is used to drive the perturbation body 4 to move in the accelerator cavity 1 along the axial direction of the accelerator cavity 1, and the detection portion is respectively connected to the accelerator cavity 1 and the driving portion.

[0028] By connecting the support part with the accelerator cavity 1 and setting the axis of the accelerator cavity 1 vertically, the position error caused by the droop of the perturbation body 4 due to the influence of gravity is avoided, and the positioning accuracy of the perturbation body 4 in the accelerator cavity 1 is ensured, thereby eliminating the measurement error caused by gravity when measuring the accelerator cavity 1, and greatly improving the electromagnetic field distribution measurement accuracy of the four-wing type radio frequency quadrupole accelerator cavity 1. By setting the perturbation body 4 in the accelerator cavity 1 and connecting it to the driving part, the driving part can drive the perturbation body 4 to move axially in the accelerator cavity 1. This setting enables the perturbation body 4 to move more accurately to the position required to be measured in the accelerator cavity 1, and can obtain field distribution information at different positions more accurately compared with the situation of being disturbed by gravity in the horizontal measurement method. By connecting the detection part to the accelerator cavity 1 and the driving part respectively, it is possible to better cooperate with the movement of the perturbation body 4 for data collection and analysis, thereby improving the accuracy of the entire field distribution measurement, and more accurately reflecting the field symmetry and flatness of the four-wing type radio frequency quadrupole accelerator cavity 1.

[0029] Among them, the four-wing radio frequency quadrupole accelerator field distribution measurement device in this embodiment is used for low-power measurement of the accelerator cavity 1, and can be called a four-wing radio frequency quadrupole accelerator field distribution low-power measurement device.

[0030] The accelerator cavity 1 is vertically arranged on the support part, so that the support part can play a good supporting effect on the accelerator cavity 1 and ensure that the accelerator cavity 1 is in a vertical state.

[0031] The accelerator cavity 1 is a cylindrical structure. The accelerator cavity 1 is vertically arranged on the support part, which can also be understood as the axial center line of the accelerator cavity 1 is vertically arranged.

[0032] Specifically, the accelerator cavity 1 is a hollow cylindrical structure, and the perturbation body 4 is arranged in the hollow part of the accelerator cavity 1 .

[0033] The perturbation body 4 is connected to a driving unit, and the driving unit provides power for the movement of the perturbation body 4 , thereby driving the perturbation body 4 to move linearly along the axial direction of the accelerator cavity 1 in the accelerator cavity 1 .

[0034] The detection part is connected to the accelerator cavity 1 and the driving part respectively, and is used to obtain the position information of the perturbation body 4 and the frequency of the radio frequency quadrupole accelerator cavity 1, and then obtain the cavity field distribution information.

[0035] The accelerator cavity 1 includes a cavity wall and four wing-shaped electrodes evenly and symmetrically distributed inside the cavity. The cavity wall and the four wing-shaped electrodes form four quadrants, and the electromagnetic field is distributed in the four quadrants.

[0036] The support part includes a bracket 2, an upper end cover 3-1 and a lower end cover 3-2. The accelerator cavity 1 is arranged on the bracket 2, the upper end cover 3-1 is arranged on the upper end surface of the accelerator cavity 1, and the lower end cover 3-2 is arranged on the lower end surface of the accelerator cavity 1.

[0037] Among them, the bracket 2 provides basic support for the accelerator cavity 1, ensuring that the cavity can be stably placed, bearing its own weight and various forces that may be received during operation, and laying the foundation for the stable operation of the entire measurement device.

[0038] The upper end cover 3-1 is arranged on the upper end surface of the accelerator cavity 1, and the lower end cover 3-2 is arranged on the lower end surface, which can close the internal space of the accelerator cavity 1, help maintain the stability of the environment in the cavity, prevent external factors from interfering with the electromagnetic field and other environments in the cavity, and ensure the accuracy of the measurement results. At the same time, the closed space is also conducive to forming a stable electromagnetic field distribution in the cavity, which meets the measurement requirements.

[0039] The support 2 includes four legs and four beams, which form a frame structure. The height of the support 2 leaves enough space to accommodate the lower end surface and the accelerator cavity 1.

[0040] The upper end cover 3 - 1 is matched with the upper end surface of the accelerator cavity 1 , and the lower end cover 3 - 2 is matched with the lower end surface of the accelerator cavity 1 to close the internal space of the accelerator cavity 1 .

[0041] The upper end cover 3-1 is matched with the upper end surface of the accelerator cavity 1, and the lower end cover 3-2 is matched with the lower end surface, which can greatly reduce the gap between the internal space of the cavity and the outside world. During the accelerator detection process, it can effectively prevent impurities such as external air and dust from entering the cavity, avoiding interference with the electromagnetic field environment and other physical processes inside the accelerator.

[0042] The upper end cover 3 - 1 is adapted in shape and size to the upper end surface of the accelerator chamber 1 , so that the upper end cover 3 - 1 can be tightly covered on the top of the upper end surface of the accelerator chamber 1 , thereby closing the upper end opening of the accelerator chamber 1 .

[0043] The shape and size of the lower end cover 3 - 2 match those of the lower end surface of the accelerator cavity 1 , so that the lower end cover 3 - 2 can be tightly covered on the bottom of the lower end surface of the accelerator cavity 1 , thereby closing the lower end opening of the accelerator cavity 1 .

[0044] Specifically, the upper end cover 3-1, the upper end surface of the accelerator chamber 1, the lower end cover 3-2 and the lower end surface of the accelerator chamber 1 may all be circular.

[0045] The perturbation body 4 is arranged on the connecting line 8 and connected to the driving part through the connecting line 8. The upper end cover 3-1 is provided with a first through hole, and the lower end cover 3-2 is provided with a second through hole. The connecting line 8 passes through the accelerator cavity 1 through the first through hole and the second through hole.

[0046] By setting the perturbation body 4 on the connecting line 8 and connecting it to the driving part through the connecting line 8, the driving part can drive the perturbation body 4 to move in the accelerator cavity 1 by controlling the connecting line 8, providing a flexible movement mechanism for the perturbation body 4, so that its position can be adjusted axially in the cavity, thereby being able to measure the field distribution at different positions of the accelerator cavity 1.

[0047] By providing the first via hole and the second via hole, not only can the connecting wire 8 pass through, but the connecting wire 8 can also be effectively restrained and guided to prevent it from excessive shaking or entanglement in the cavity, thereby ensuring the stability and reliability of the connection.

[0048] The first through hole and the second through hole are arranged opposite to each other along the axial direction of the accelerator cavity 1 , so that the connecting line 8 extends along the axial direction of the accelerator cavity 1 in the accelerator cavity 1 , thereby making the perturbation body 4 move along the axial direction of the accelerator cavity 1 .

[0049] The connecting line 8 is made of aramid fiber material or nylon.

[0050] The perturbation body 4 is spherical or cylindrical.

[0051] Specifically, when the perturbation body 4 is spherical, the connecting line 8 passes through the center of the perturbation body 4 vertically.

[0052] Specifically, when the perturbation body 4 is cylindrical, the connecting line 8 passes through the center points of the upper and lower end surfaces of the perturbation body 4 in the vertical direction.

[0053] In this embodiment, the diameter of the perturbation body 4 is 10 mm. It is understandable that the specific size of the perturbation body 4 can be determined by the frequency change caused by the perturbation body 4 in the four-wing radio frequency quadrupole accelerator cavity 1, and this embodiment does not limit the size of the perturbation body 4.

[0054] The perturbation body 4 is fixedly connected to the connecting line 8 , so that the connecting line 8 can stably drive the perturbation body 4 to move up and down, but the perturbation body 4 cannot move relative to the connecting line 8 , that is, the perturbation body 4 cannot move on the connecting line 8 .

[0055] The connecting wire 8 is closed into a loop, the driving part includes a driving member 6 , and the connecting wire 8 is connected to an output end of the driving member 6 , so that the driving member 6 can stably drive the perturbation body 4 to move through the connecting wire 8 .

[0056] The driving member 6 may be a motor, and the connecting line 8 is connected to the output shaft of the motor or the output shaft of a reducer connected to the motor.

[0057] The driving member 6 can rotate forward and reverse, thereby driving the perturbation body 4 to move bidirectionally along the axial direction in the accelerator cavity 1, so as to more comprehensively measure the field distribution at different positions of the accelerator cavity 1.

[0058] The perturbation body 4 is fixed to the connecting wire 8, and then the connecting wire 8 is passed around the transmission pulley 5 and the output shaft of the driving member 6 and inserted into the accelerator cavity 1, and finally the two ends of the perturbation body 4 carrying wire are tied together.

[0059] The driving part includes an upper support member 7-1 and a lower support member 7-2. The upper support member 7-1 is arranged on the upper end cover 3-1, and the lower support member 7-2 is arranged on the lower end cover 3-2. The driving member 6 is arranged on the upper support member 7-1 and / or the lower support member 7-2. A transmission pulley 5 is arranged on the upper support member 7-1 and the lower support member 7-2, and the connecting line 8 is slidably arranged on the transmission pulley 5.

[0060] By arranging the upper support member 7-1 on the upper end cover 3-1 and the lower support member 7-2 on the lower end cover 3-2, a stable support function can be provided for the driving part. The upper support member 7-1 and the lower support member 7-2 can bear the weight of the driving part 6, the connecting wire 8, the perturbation body 4 and other components and the force generated during the movement, ensuring that the driving part works stably at the upper and lower ends of the accelerator cavity 1.

[0061] The transmission pulleys 5 provided on the upper support member 7-1 and the lower support member 7-2 provide precise guiding for the connecting wire 8. The connecting wire 8 is slidably provided on the transmission pulley 5, so that the connecting wire 8 can move along a predetermined path during the movement, avoiding the deviation or entanglement of the connecting wire 8, thereby ensuring that the perturbation body 4 can accurately move to the desired position in the accelerator cavity 1 for field distribution measurement.

[0062] As a feasible implementation manner, the driving member 6 is disposed on the upper support member 7 - 1 , and the connecting line 8 and the perturbation body 4 are driven to move by the driving member 6 .

[0063] As a feasible implementation manner, the driving member 6 is disposed on the lower support member 7 - 2 , and the connecting line 8 and the perturbation body 4 are driven to move by the driving member 6 .

[0064] As a feasible implementation, there may be two driving members 6, one of which is arranged on the upper support member 7-1, and the other is arranged on the lower support member 7-2, and the connecting line 8 and the perturbation body 4 are driven to move by the two driving members 6.

[0065] By arranging the driving member 6 on the upper support member 7-1 and / or the lower support member 7-2, the driving member 6 is provided with a stable support effect while improving the flexibility of the installation of the driving member 6. The driving member 6 can be installed on the upper support member 7-1, the lower support member 7-2 or on both at the same time according to actual needs to meet different driving requirements and design layouts.

[0066] The arrangement of the upper support 7-1 and the lower support 7-2 is conducive to optimizing space utilization and system integration. The various components of the drive unit are reasonably distributed at the upper and lower ends of the accelerator cavity 1, making the structure of the entire drive unit more compact and reasonable. At the same time, it is also convenient to cooperate with other components such as the related structures of the upper end cover 3-1 and the lower end cover 3-2, thereby improving the integration and working efficiency of the entire measurement device.

[0067] Among them, the upper support member 7-1 and the lower support member 7-2 are symmetrically arranged.

[0068] Specifically, the upper support member 7 - 1 and the lower support member 7 - 2 may have the same structural dimensions, but the installation directions are symmetrical.

[0069] More specifically, the upper support member 7-1 and the lower support member 7-2 can both be L-shaped structures, wherein the first section is vertically arranged and the second section is horizontally arranged.

[0070] There may be six transmission pulleys 5, and the inner end upper corner, the inner end lower corner and the outer end upper corner of the second section of the upper support member 7-1 are all provided with transmission pulleys 5. The inner end upper corner, the inner end lower corner and the outer end lower corner of the second section of the lower support member 7-2 are all provided with transmission pulleys 5. The two transmission pulleys 5 at the inner end of the second section of the upper support member 7-1 and the two transmission pulleys 5 at the inner end of the second section of the lower support member 7-2 are vertically opposite and arranged in sequence.

[0071] The inner end of the second section of the upper support member 7-1 refers to the end located directly above the accelerator cavity 1. The inner end of the second section of the lower support member 7-2 refers to the end located directly below the accelerator cavity 1. The outer end of the second section of the upper support member 7-1 refers to the end located outside the accelerator cavity 1, that is, the end diagonally above. The outer end of the second section of the lower support member 7-2 refers to the end located outside the accelerator cavity 1, that is, the end diagonally below.

[0072] The four-wing radio frequency quadrupole accelerator field distribution measurement device also includes an upper positioning portion 9-1 and a lower positioning portion 9-2. The upper positioning portion 9-1 is arranged on the upper end cover 3-1, and the upper support member 7-1 is arranged on the upper positioning portion 9-1. The upper positioning portion 9-1 is used to drive the upper support member 7-1 to move along the first direction and the second direction. The lower positioning portion 9-2 is arranged on the lower end cover 3-2, and the lower support member 7-2 is arranged on the lower positioning portion 9-2. The lower positioning portion 9-2 is used to drive the lower support member 7-2 to move along the first direction and the second direction. The first direction is perpendicular to the second direction, and both are perpendicular to the axial direction of the accelerator cavity 1.

[0073] By setting the upper positioning part 9-1 and the lower positioning part 9-2, the measurement flexibility is enhanced. The synergistic effect of the upper positioning part 9-1 and the lower positioning part 9-2 provides the perturbation body 4 with the ability to accurately position in two vertical directions. The upper positioning part 9-1 can drive the upper support member 7-1 to move in two mutually perpendicular directions perpendicular to the axial direction of the accelerator cavity 1, and the lower positioning part 9-2 can drive the lower support member 7-2 to move in the same two vertical directions, so that the perturbation body 4 can be accurately positioned at any desired position on the cross section of the accelerator cavity 1. Whether measuring the area close to the cavity wall or the center area of ​​the cavity, the perturbation body 4 can be accurately positioned through the fine adjustment of the upper positioning part 9-1 and the lower positioning part 9-2.

[0074] Among them, the upper positioning part 9-1 and the lower positioning part 9-2 can realize precise control of the position of the perturbation body 4 on the cross section of the cavity, and can measure the field distribution at different positions more finely, thereby improving the measurement accuracy. The driving part drives the perturbation body 4 to move axially, so that the measurement is more comprehensive, and can cover all areas of the cross section of the accelerator cavity 1 without missing any key positions that may affect the field distribution, providing more reliable data support for accurately understanding the field distribution characteristics of the accelerator cavity 1.

[0075] The first direction and the second direction are both horizontal directions, and the first direction is perpendicular to the second direction.

[0076] Among them, the upper positioning portion 9-1 and the lower positioning portion 9-2 are symmetrically arranged.

[0077] Specifically, the upper positioning portion 9-1 and the lower positioning portion 9-2 may have the same structural dimensions, but the installation directions are symmetrical. The upper positioning portion 9-1 and the lower positioning portion 9-2 move synchronously, thereby ensuring that the connecting line 8 is in a vertical state.

[0078] The upper positioning portion 9-1 includes a first slide rail and a second slide rail, the first slide rail and the second slide rail are vertically arranged, the first slide rail is arranged on the upper end cover 3-1, the second slide rail is slidably arranged on the first slide rail, and the upper support member 7-1 is slidably arranged on the second slide rail.

[0079] By setting the first slide rail and the second slide rail, accurate positioning capability is provided. The first slide rail is set on the upper end cover 3-1, providing a basic positioning direction for the upper positioning part 9-1. The second slide rail is perpendicular to the first slide rail and is slidably set on the first slide rail, and the upper support member 7-1 is slidably set on the second slide rail. Through the coordinated action of the first slide rail and the second slide rail, the upper support member 7-1 can achieve accurate two-dimensional movement in a plane perpendicular to the axial direction of the accelerator cavity 1, thereby driving the perturbation body 4 to achieve accurate two-dimensional positioning, meeting the needs of field distribution measurement at different positions of the accelerator cavity 1.

[0080] Wherein, the first slide rail and the second slide rail are both arranged horizontally.

[0081] The second slide rail is vertical and stacked on the top of the first slide rail. Specifically, the second slide rail is slidably connected to the first slide rail through a slider.

[0082] The lower positioning portion 9-2 includes a third slide rail and a fourth slide rail. The third slide rail is vertically arranged with the fourth slide rail. The third slide rail is arranged on the lower end cover 3-2. The fourth slide rail is slidably arranged on the third slide rail. The lower support member 7-2 is slidably arranged on the fourth slide rail.

[0083] By setting the third slide rail and the fourth slide rail, accurate positioning capability is provided. The third slide rail is set on the lower end cover 3-2, providing a basic positioning direction for the lower positioning part 9-2. The fourth slide rail is perpendicular to the third slide rail and is slidably set on the third slide rail. The lower support member 7-2 is slidably set on the fourth slide rail. Through the coordinated action of the third slide rail and the fourth slide rail, the lower support member 7-2 can achieve accurate two-dimensional movement in a plane perpendicular to the axial direction of the accelerator cavity 1, thereby driving the perturbation body 4 to achieve accurate two-dimensional positioning, meeting the needs of measuring the field distribution at different positions of the accelerator cavity 1.

[0084] Wherein, the third slide rail and the fourth slide rail are both arranged horizontally.

[0085] The fourth slide rail is vertical and overlapped at the bottom of the third slide rail. Specifically, the fourth slide rail is slidably connected to the bottom of the third slide rail through a sliding block.

[0086] Among them, the second slide rail and the fourth slide rail move synchronously, and the upper support member 7-1 and the lower support member 7-2 move synchronously.

[0087] The first slide rail and the third slide rail are arranged parallel and opposite to each other in the axial direction of the accelerator chamber 1 .

[0088] The detection unit includes a frequency measurement device 10 and a data acquisition system 11. The accelerator cavity 1 is provided with a sampling port 12. The frequency measurement device 10 is connected to the sampling port 12. The data acquisition system 11 is respectively connected to the frequency measurement device 10 and the driving unit.

[0089] By connecting the frequency measuring device 10 to the sampling port 12 of the accelerator cavity 1, it is possible to directly obtain frequency information related to the field distribution of the accelerator cavity 1. By measuring and analyzing the obtained frequency information, the frequency characteristics of the electromagnetic field inside the accelerator cavity 1 can be obtained.

[0090] The frequency measurement device 10 may be a vector network analyzer, and is connected to the accelerator cavity 1 through a coaxial cable and a sampling port 12 .

[0091] The data acquisition system 11 is used to collect the position information of the perturbation body 4 and the frequency of the radio frequency quadrupole accelerator cavity 1 .

[0092] The data acquisition system 11 is connected to the cavity frequency measurement device 10 and the driving element 6 via a data line.

[0093] During measurement, the data acquisition system 11 is turned on to record and store the position information of the perturbation body 4 and the frequency of the radio frequency quadrupole accelerator cavity 1 to obtain the cavity field distribution information.

[0094] The data acquisition system 11 is connected to the frequency measurement device 10 and the driving part respectively, and plays a role in comprehensively collecting and analyzing data. The frequency data obtained by the frequency measurement device 10 can be collected, and the relevant operating parameters of the driving part can also be obtained, such as the driving speed of the driving member 6, the position information of the perturbation body 4, etc. Through the comprehensive analysis of various aspects of data, various situations in the field distribution measurement process can be more comprehensively understood.

[0095] Among them, the frequency measurement device 10 and the data acquisition system 11 can automatically perform measurement and data acquisition according to the preset program without excessive human intervention. During the measurement process, as the driving unit drives the perturbation body 4 to move in the accelerator cavity 1, the detection unit can automatically collect relevant data at different positions and perform real-time analysis and processing, which greatly improves the measurement efficiency and the accuracy of the measurement results, and also reduces the errors that may be caused by manual operation.

[0096] In one embodiment, the front end of the heavy ion accelerator (HIAF) is injected into the RFQ accelerator. The HIAF RFQ accelerator is a four-wing RF quadrupole accelerator with a frequency of 81.25 MHz and a cross-sectional inscribed circle radius of 342.5 mm. Because of its large cross-sectional size and extremely high requirements for field symmetry (within ±1.2%), low-power measurement is performed using the four-wing RF quadrupole accelerator field distribution measurement device in this embodiment.

[0097] It is easy for those skilled in the art to understand that the above-mentioned advantageous methods can be freely combined and superimposed without conflict.

[0098] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A four-wing radio frequency quadrupole accelerator field distribution measurement device, characterized in that: The device comprises a support portion, a perturbation body (4), a driving portion and a detection portion, wherein the support portion is used to be connected to an accelerator cavity (1) so as to fix the accelerator cavity (1) and to arrange the axis of the accelerator cavity (1) vertically, the perturbation body (4) is arranged in the accelerator cavity (1), the perturbation body (4) is connected to the driving portion, the driving portion is used to drive the perturbation body (4) to move in the accelerator cavity (1) along the axial direction of the accelerator cavity (1), and the detection portion is respectively connected to the accelerator cavity (1) and the driving portion; The support portion comprises a bracket (2), an upper end cover (3-1) and a lower end cover (3-2); the accelerator cavity (1) is arranged on the bracket (2); the upper end cover (3-1) is arranged on the upper end surface of the accelerator cavity (1); and the lower end cover (3-2) is arranged on the lower end surface of the accelerator cavity (1); The driving part further comprises an upper support member (7-1) and a lower support member (7-2), wherein the upper support member (7-1) is arranged on the upper end cover (3-1), and the lower support member (7-2) is arranged on the lower end cover (3-2); The four-wing radio frequency quadrupole accelerator field distribution measurement device further comprises an upper positioning portion (9-1) and a lower positioning portion (9-2), wherein the upper positioning portion (9-1) is arranged on the upper end cover (3-1), the upper support member (7-1) is arranged on the upper positioning portion (9-1), the upper positioning portion (9-1) is used to drive the upper support member (7-1) to move along a first direction and a second direction, the lower positioning portion (9-2) is arranged on the lower end cover (3-2), the lower support member (7-2) is arranged on the lower positioning portion (9-2), the lower positioning portion (9-2) is used to drive the lower support member (7-2) to move along a first direction and a second direction, the first direction is perpendicular to the second direction, and both are perpendicular to the axial direction of the accelerator cavity (1); The upper positioning portion (9-1) comprises a first slide rail and a second slide rail, the first slide rail and the second slide rail are arranged vertically, the first slide rail is arranged on the upper end cover (3-1), the second slide rail is slidably arranged on the first slide rail, and the upper support member (7-1) is slidably arranged on the second slide rail; The lower positioning portion (9-2) comprises a third slide rail and a fourth slide rail, the third slide rail is vertically arranged with respect to the fourth slide rail, the third slide rail is arranged on the lower end cover (3-2), the fourth slide rail is slidably arranged on the third slide rail, and the lower support member (7-2) is slidably arranged on the fourth slide rail.

2. The four-wing radio frequency quadrupole accelerator field distribution measurement device according to claim 1, characterized in that: The upper end cover (3-1) is matched with the upper end surface of the accelerator cavity (1), and the lower end cover (3-2) is matched with the lower end surface of the accelerator cavity (1), so as to close the internal space of the accelerator cavity (1).

3. The four-wing radio frequency quadrupole accelerator field distribution measurement device according to claim 1, characterized in that: The perturbator (4) is arranged on a connecting line (8) and is connected to the driving unit via the connecting line (8); the upper end cover (3-1) is provided with a first through hole, and the lower end cover (3-2) is provided with a second through hole; the connecting line (8) passes through the accelerator cavity (1) via the first through hole and the second through hole.

4. The four-wing radio frequency quadrupole accelerator field distribution measurement device according to claim 3, characterized in that: The connecting line (8) is closed into a loop, the driving portion comprises a driving member (6), and the connecting line (8) is connected to an output end of the driving member (6).

5. The four-wing radio frequency quadrupole accelerator field distribution measurement device according to claim 4, characterized in that: The driving member (6) is arranged on the upper supporting member (7-1) and / or the lower supporting member (7-2), a transmission pulley (5) is arranged on the upper supporting member (7-1) and the lower supporting member (7-2), and the connecting line (8) is slidably arranged on the transmission pulley (5).

6. The four-wing radio frequency quadrupole accelerator field distribution measurement device according to claim 3, characterized in that: The connecting line (8) is made of aramid fiber material or nylon; the perturbation body (4) is spherical or cylindrical.

7. The four-wing radio frequency quadrupole accelerator field distribution measurement device according to claim 1, characterized in that: The detection unit comprises a frequency measurement device (10) and a data acquisition system (11); the accelerator chamber (1) is provided with a sampling port (12); the frequency measurement device (10) is connected to the sampling port (12); and the data acquisition system (11) is respectively connected to the frequency measurement device (10) and the driving unit.

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