Radio frequency accelerator

Abstract

The utility model provides a radio frequency accelerator which comprises a cavity, and a plurality of light-permeable observation windows are arranged on the side wall of the cavity; the ignition monitoring module comprises a light receiving unit and a photoelectric conversion unit; the light receiving unit is used for receiving a light signal when ignition occurs in the cavity through the observation window; the photoelectric conversion unit is connected with the light receiving unit and is used for converting the light signal into a monitoring signal; the shading module covers the observation window, a through hole is formed in the end face of one side, far away from the cavity, of the shading module, the light receiving unit penetrates through the through hole, the end face of the other side is connected with the outer wall of the cavity, and a shading space is formed between the end face and the outer wall of the cavity. According to the radio frequency accelerator provided by the invention, the ignition condition is rapidly and accurately monitored through the ignition monitoring module, so that the ignition condition is conveniently monitored, and the influence of ignition on the cavity of the accelerator is effectively reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of tumor treatment, and relates to a neutron capture therapy technology, in particular to a radio frequency accelerator. BACKGROUND

[0002] In a boron neutron capture therapy (BNCT) treatment process, a radio frequency accelerator is often used to accelerate neutrons, so as to realize accurate control of the emission direction and emission energy of the neutron beam.

[0003] In the prior art, the radio frequency accelerator forms an electric field in the cavity by applying a voltage to the cavity, so as to accelerate the neutron beam. However, if the radio frequency accelerator has an excessively large electric field strength or the vacuum degree in the cavity is insufficient, the electric field in the cavity will ionize gas molecules, which is easy to cause a sparking phenomenon, that is, an electric arc short circuit phenomenon of the ionized gas molecules. If not handled in time, the sparking phenomenon will affect the acceleration effect of the accelerator on the neutron beam, and in severe cases, will damage the performance of the accelerator and affect the operation stability of the accelerator.

[0004] Therefore, how to quickly and efficiently monitor the sparking phenomenon in the radio frequency accelerator is an urgent problem to be solved by those skilled in the art. SUMMARY

[0005] The application aims to provide a radio frequency accelerator, which can quickly find the sparking phenomenon in the radio frequency accelerator, so as to solve the problems that the existing technology cannot quickly find the sparking phenomenon in the radio frequency accelerator, and the accelerator loses the acceleration effect on the neutrons and the performance of the accelerator is damaged.

[0006] In a first aspect, the application provides a radio frequency accelerator, comprising: a cavity, a plurality of light-transmissive observation windows are arranged on the side wall of the cavity; a sparking monitoring module, comprising a light receiving unit and a photoelectric conversion unit; the light receiving unit is used for receiving a light signal when sparking occurs in the cavity through the observation window; the photoelectric conversion unit is connected to the light receiving unit and is used for converting the light signal into a monitoring signal; a light shielding module is arranged at the observation window, a through hole is arranged on the side end face of the light shielding module away from the cavity, so that the light receiving unit passes through the through hole, and the other side end face is connected to the outer wall of the cavity, so that a light shielding space is formed between the outer wall of the cavity and the light shielding module.

[0007] In an embodiment of the application, a sealing structure is arranged between the light shielding module and the outer wall of the cavity and between the light shielding module and the light receiving unit.

[0008] In an embodiment of the application, the sealing structure comprises a light-tight sealing element.

[0009] In an embodiment of the application, the side wall of the cavity is provided with a matching portion at the observation window, which is used for matching the light shielding module.

[0010] In an embodiment of the utility model, the light shielding module includes: a cover body, which is arranged on the observation window, and a through hole is arranged on the side end face of the cover body away from the cavity; a connecting piece, which is arranged on the cover body and is used for connecting the cover body to the connecting part.

[0011] In an embodiment of the utility model, the connecting piece includes at least one fixed screw rod which is screwed on the cover body, and the connecting part is tightly arranged in the cover body by screwing the fixed screw rod.

[0012] In an embodiment of the utility model, the light receiving unit includes: an optical fiber, the first end of the optical fiber is a free end, and the other end is connected to the photoelectric conversion unit; an optical fiber connector, which is sleeved on the optical fiber and is close to the side of the observation window; the optical fiber connector is connected to the through hole, so that the first end of the optical fiber is located outside the observation window in the connected state, and the optical signal generated when the cavity is struck is received through the observation window.

[0013] In an embodiment of the utility model, the outer surface of the optical fiber is provided with external threads; the optical fiber connector is a threaded sleeve, the inner wall of the threaded sleeve is provided with internal threads, and the internal threads are connected to the external threads of the optical fiber; the outer wall of the threaded sleeve is provided with external threads, and the external threads are connected to the internal threads of the through hole.

[0014] In an embodiment of the utility model, the outer surface of the optical fiber is provided with external threads; the optical fiber connector is a threaded sleeve, the inner wall of the threaded sleeve is provided with internal threads, and the internal threads are connected to the external threads of the optical fiber; the outer wall of the threaded sleeve is provided with external threads, and the external threads are connected to the internal threads of the through hole.

[0015] In an embodiment of the utility model, the optical fiber is a POF optical fiber, and the optical fiber connector is an FC type.

[0016] In an embodiment of the utility model, the observation window includes quartz glass, and the thickness of the glass is any value in the range of 2-4 mm.

[0017] As described above, the application provides a radio frequency accelerator, which is provided with a striking monitoring module and a light shielding module at the observation window, so that the light signal generated when the cavity is struck is monitored in the light-proof space formed by the modules, and the light signal is converted into a monitoring signal, so that the striking condition can be quickly and accurately monitored, and the striking condition can be processed, the damage caused by the mismatch of the cavity due to the striking is avoided, and the service life of the radio frequency accelerator is improved, and the stable operation of the radio frequency accelerator for a long time is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1A schematic diagram of a radio frequency accelerator structure according to an embodiment of the present application is shown.

[0019] Figure 2 A schematic diagram of a connection structure between a light shielding unit and a cavity according to an embodiment of the present application is shown.

[0020] Figure 3 A schematic diagram of a mating structure between a fiber joint and a through hole according to an embodiment of the present application is shown.

[0021] Figure 4 A schematic diagram of a mating structure between a fiber and a fiber joint according to an embodiment of the present application is shown.

[0022] Element number explanation

[0023] 100 cavity

[0024] 110 observation window

[0025] 120 mating portion

[0026] 130 air pump

[0027] 200 ignition monitoring module

[0028] 210 light receiving unit

[0029] 211 fiber

[0030] 212 fiber joint

[0031] 300 light shielding module

[0032] 310 cover

[0033] 320 connecting piece

[0034] 330 through hole DETAILED DESCRIPTION

[0035] The present application will be described by specific, concrete examples. It is readily apparent to one of ordinary skill in the art that the present application as described herein will also be apparent from the following examples, and various modifications and adaptations that are apparent to those skilled in the art are intended to be within the spirit and scope of the present application. It is to be understood that the following examples are merely illustrative of the present application and that various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application. It should be noted that the following examples and features thereof can be combined with each other in the absence of conflicts.

[0036] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner, and only the components related to the present application are shown in the diagrams, not the number, shape and size of the components when actually implemented. The actual implementation of each component can be a random change, and the component layout can be more complex.

[0037] The principle and implementation of a radio frequency accelerator of the present embodiment will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can understand the radio frequency accelerator of the present embodiment without creative labor.

[0038] As shown in Figure 1 The present embodiment provides a radio frequency accelerator, which comprises a cavity 100, a sparking monitoring module 200 and a light shielding module 300.

[0039] The cavity 100 is an acceleration cavity of the accelerator, and an acceleration channel for the neutron beam to pass through is formed inside the cavity 100. A plurality of light-transmissive observation windows 110 are arranged on the side walls of the cavity 100. Exemplarily, the observation windows 110 are arranged on the side walls of the acceleration section of the cavity 100.

[0040] In the present application, the sparking monitoring module 200 comprises a light receiving unit 210 and a photoelectric conversion unit (not labeled) connected to the light receiving unit 210. The light receiving unit 210 is arranged at the observation window 110 and is used to receive the light signal generated when sparking occurs in the cavity 100 through the observation window 110. The photoelectric conversion unit is connected to the light receiving unit 210 and is used to convert the light signal into a monitoring signal. Exemplarily, the photoelectric conversion unit comprises a photoelectric sensor, which converts the light signal into an electrical signal as the monitoring signal.

[0041] In the present application, the light shielding module 300 is arranged at the observation window 110. The light shielding module 300 is provided with a through hole 330 on the side end face away from the cavity 100, through which the light receiving unit 210 passes, and the other side end face is connected to the outer wall of the cavity 100, and a light shielding space is formed between the outer wall of the cavity 100.

[0042] Since the light generated when sparking occurs inside the cavity 100 is actually weak in intensity, external light will affect the accuracy of the detection of the light signal when sparking occurs. The present application sets the light shielding module 300 to avoid the interference of external light on the detection of sparking based on the light shielding space formed between the light shielding module 300 and the outer wall of the cavity 100, so as to improve the accuracy of the detection of sparking.

[0043] In some optional embodiments, the observation window 110 is made of quartz glass, which has the advantage of not being easily aged in a radiation environment compared to other transparent materials, and can effectively prolong the service life.

[0044] More specifically, the quartz glass sheet has a thickness of any thickness in a range from 2 mm to 4 mm, which not only ensures that the observation window 110 can effectively withstand the internal and external pressure difference caused by the vacuum inside the cavity 100, but also ensures that the observation window 110 has high light transmission performance, thereby improving the accuracy of the spark monitoring.

[0045] In some optional embodiments, in order to further ensure that external light does not enter the light-avoiding space, a light-tight sealing member is arranged between the light-shielding module 300 and the outer side of the cavity 100 and between the light-shielding module 300 and the light-receiving unit 210, so as to cover or fill the gap at the connection, thereby avoiding light leakage at the gap and ensuring the light-avoiding property of the internal space of the light-shielding module 300. For example, the sealing member is a sealing film or a sealing ring made of silicone or rubber, so as to improve the light-avoiding property of the internal space of the light-shielding module 300.

[0046] In some optional embodiments, in order to facilitate the fixation of the light-shielding module 300 at the observation window 110 of the cavity 100, as shown in FIG. 1, a fitting portion 120 for installing the light-shielding module 300 is arranged on the side wall of the cavity 100 at the observation window 110. The fitting portion 120 and the light-shielding module 300 are fitted to connect the light-shielding module 300 to the outer wall of the cavity 100, thereby achieving the fixation of the light-shielding module 300. Figure 2

[0047] In a specific embodiment, the light-shielding module 300 includes a cover 310 and a connecting member 320.

[0048] The cover 310 is arranged at the observation window 110 to form a light-avoiding space between the cover 310 and the observation window 110. The cover 310 is arranged on a side end face away from the cavity 100 and is provided with a through hole 330 for the light-receiving unit to pass through.

[0049] The connecting member 320 is arranged on the cover 310 and is used to fit the cover 310 to the fitting portion 120, so as to achieve the fixation of the light-shielding module 300.

[0050] In a specific embodiment, the connecting member 320 includes at least one fixing screw, which is threadedly connected to a cover edge of the cover 310. A first end of the fixing screw is a free end protruding from the cover 310, and a second end of the fixing screw extends into the internal space of the cover 310. When the fixing screw is tightened, the second end of the fixing screw gradually approaches and abuts against the fitting portion 120, so as to abut the fitting portion 120 against the cover 310.

[0051] ​Exemplarily, the cover 310 comprises a bottom surface and a cover edge perpendicular to the bottom surface; the bottom surface is opposite to the observation window 110; the cover edge is provided with threaded holes in four directions of up, down, left and right, and the threaded holes correspond to the fixing screws one by one; each fixing screw is threadedly connected with the cover 310 through the corresponding threaded hole. When it is needed to fix the light shielding module 300 to the outer wall of the cavity 100, each fixing screw is screwed so that the fixing screw is screwed until it abuts against the connecting part 120, so that the connecting part 120 is abutted against the inside of the cover 310 from four directions of up, down, left and right, to further enhance the fastening degree of the connection between the connecting part 120 and the cover 310.

[0052] Exemplarily, the ignition monitoring module 200 comprises four fixing screws, which pass through the light shielding module 300 from four directions of up, down, left and right and abut against the connecting part 120 on the cavity 100, so that the light shielding module 300 is fixed at the observation window 110 of the cavity 100.

[0053] It should be noted that in other specific embodiments, the connecting part 120 and the connecting piece 320 can also be connected through threaded connection, buckle connection or other connection modes capable of realizing fixed connection.

[0054] In some optional embodiments, as shown in the figure, Figure 3 The light receiving unit 210 comprises an optical fiber 211 and an optical fiber connector 212;

[0055] The first end of the optical fiber 211 is a free end and is close to the outer side of the observation window 110 to better receive the light signal; the second end of the optical fiber 211 is connected to the photoelectric conversion unit to transmit the ignition signal to the photoelectric conversion unit;

[0056] The optical fiber connector 212 is sleeved on the optical fiber 211 and close to the side of the observation window 110, and the optical fiber connector 212 is connected with the through hole 330, so that the first end of the optical fiber 211 is located outside the observation window 110 in the connected state, and the light signal generated when the ignition occurs in the cavity 100 is received through the observation window 110; exemplarily, the optical fiber 211 adopts POF optical fiber, and the optical fiber connector 212 adopts FC type.

[0057] Specifically, the optical fiber connector 212 is a plug-in pipe, and the diameter of the plug-in pipe is equal to the hole diameter of the through hole 330, so that the plug-in pipe can be inserted into the through hole 330 and fixed in the through hole 330, thereby realizing the connection of the optical fiber connector 212 and the through hole 330, and realizing the fixation of the light receiving unit, so that the optical fiber 211 receives the light signal generated when the ignition occurs in the cavity 100 through the observation window 110.

[0058] It should be noted that the threaded connection mode can also be used between the through hole 330 and the optical fiber joint 212. The inner wall of the through hole 330 is provided with an internal thread, and the optical fiber joint 212 is a threaded sleeve, the outer wall of the threaded sleeve is provided with an external thread, the external thread is matched with the internal thread of the through hole 330 to realize the matching of the optical fiber joint 212 and the through hole 330, and then the fixing of the light receiving unit is realized, so that the first end of the optical fiber 211 is located outside the observation window 110 to receive the light signal generated by the spark in the observation window 110.

[0059] To ensure the accuracy of the received light signal, the optical fiber 211 needs to be tightly attached to the outer side of the observation window 110. When the size of the light shielding module 300 changes, the optical fiber joint 212 often needs to be replaced to match the size of the light shielding module 300. To improve the adaptability between the optical fiber joint 212 and the light shielding module 300, so that the optical fiber joint 212 can be more conveniently adapted to light shielding modules 300 of different sizes, in some optional embodiments, as shown in the figure, the outer surface of the optical fiber 211 is provided with an external thread, and the inner wall of the optical fiber joint 212 is provided with an internal thread, the internal thread of the optical fiber joint 212 is matched with the external thread of the optical fiber 211 to realize the position adjustment between the optical fiber joint 212 and the optical fiber 211. Figure 4

[0060] Specifically, when the optical fiber joint 212 is a threaded sleeve, the inner wall of the threaded sleeve is provided with an internal thread, and the internal thread is matched with the external thread of the optical fiber 211. The outer wall of the threaded sleeve is provided with an external thread, and the external thread is matched with the internal thread of the through hole 330.

[0061] Or, when the optical fiber joint 212 is a plug-in pipe, the inner wall of the plug-in pipe is provided with an internal thread, and the internal thread is matched with the external thread of the optical fiber 211. The diameter of the plug-in pipe is matched with the aperture of the through hole 330 to be inserted into the through hole 330.

[0062] When the optical fiber joint 212 is matched at the through hole 330, the position of the optical fiber joint 212 on the optical fiber 211 can be adjusted by rotating the optical fiber joint 212, and then the length of the optical fiber 211 protruding out of the optical fiber joint 212 is adjusted, that is, the depth of the optical fiber 211 into the light shielding module 300 is adjusted, so that the light shielding modules 300 of different sizes can be efficiently adapted to realize that one end of the optical fiber 211 is tightly attached to the outer side of the observation window 110.

[0063] It should be noted that the light receiving unit described in the present application can also be an optical waveguide or other optical transmission device.

[0064] ​In an optional embodiment, the radio frequency accelerator comprises acceleration assemblies arranged circumferentially along the cavity 100 for accelerating the neutron beam; for example, the acceleration assemblies comprise radio frequency power sources.

[0065] In an optional embodiment, the radio frequency accelerator comprises a vacuum pumping module arranged on the side wall of the cavity 100 and in communication with the internal space of the cavity 100 for performing vacuum pumping operation on the cavity 100.

[0066] Specifically, the vacuum pumping module comprises a plurality of air pumps 130, for example, Figure 1 As shown, each air pump 130 is arranged at intervals on both sides of the cavity 100 and is assembled on the outer side wall of the cavity 100; the cavity 100 is provided with exhaust ports at the corresponding positions of the air pumps 130, and the exhaust ports are matched with the air suction ports of the air pumps 130 to realize the communication between the internal space of the cavity 100 and the air suction channel in the air pump 130, so that the air in the internal space of the cavity 100 is pumped by the air pump 130 to realize the vacuum state in the internal space of the cavity 100.

[0067] The radio frequency accelerator provided in the embodiment improves the vacuum degree of the cavity 100 by forming a vacuum pumping channel through the vacuum pumping operation of the vacuum pumping module on the cavity 100, avoids the influence of impurities when the radio frequency accelerator works, reduces the risk of failure, and is conducive to the long-term stable operation of the radio frequency accelerator under the design index.

[0068] In summary, the radio frequency accelerator provided in the present application uses the light shielding module and the sparking monitoring module arranged at the observation window to monitor the sparking phenomenon in the cavity through the light signal generated when sparking occurs in the light shielding space, which not only is fast and efficient, but also avoids the interference of external environmental light, realizes effective monitoring, timely reminds the operator, avoids the performance of the radio frequency accelerator from being damaged, and prolongs the service life of the radio frequency accelerator, which is conducive to actual production and application. The description of the process or structure corresponding to each of the above figures has its own emphasis, and the parts not described in detail in a certain process or structure can be referred to the related description of other processes or structures.

[0069] The above embodiments are only illustrative of the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical thought disclosed in the present application shall be covered by the claims of the present application.

Claims

1. A radio frequency accelerator characterized by, The application relates to a spark monitoring device, comprising: a cavity provided with a plurality of light-permeable observation windows on the side wall of the cavity; a spark monitoring module comprising a light receiving unit and a photoelectric conversion unit; the light receiving unit is used for receiving a light signal generated when a spark occurs in the cavity through the observation window; the photoelectric conversion unit is connected to the light receiving unit and is used for converting the light signal into a monitoring signal; a light shielding module covering the observation window, wherein a through hole is arranged on the side end face of the light shielding module away from the cavity, the light receiving unit passes through the through hole, and the other side end face of the light shielding module is connected to the outer wall of the cavity to form a light shielding space between the light shielding module and the outer wall of the cavity.

2. The radio frequency accelerator of claim 1, wherein, Sealing members which are not permeable to light are arranged between the light shielding module and the outer wall of the cavity and between the light shielding module and the light receiving unit.

3. The radio frequency accelerator of claim 1, wherein, The side wall of the cavity is provided with a matching part at the observation window for matching the light shielding module.

4. The radio frequency accelerator of claim 3, wherein, The light shielding module comprises: a cover covering the observation window, wherein the through hole is arranged on the side end face of the cover away from the cavity; a connecting piece arranged on the cover and used for matching the cover to the matching part.

5. The radio frequency accelerator of claim 4, wherein, The connecting piece comprises at least one fixed screw rod screwed on the cover edge of the cover, and the matching part is tightly pressed in the cover by screwing the fixed screw rod.

6. The radio frequency accelerator of claim 1, wherein, The light receiving unit comprises: an optical fiber, wherein the first end of the optical fiber is a free end, and the other end is connected to the photoelectric conversion unit; an optical fiber connector sleeved on the optical fiber and arranged on the side close to the observation window; the optical fiber connector is matched with the through hole, so that the first end of the optical fiber is located outside the observation window in the matching state, and the light signal generated when a spark occurs in the cavity is received through the observation window.

7. The radio frequency accelerator of claim 6, wherein, An outer thread is arranged on the outer surface of the optical fiber; the optical fiber connector is a threaded sleeve, an inner thread is arranged on the inner wall of the threaded sleeve, the inner thread is matched with the outer thread of the optical fiber, an outer thread is arranged on the outer wall of the threaded sleeve, and the outer thread is matched with the inner thread of the through hole.

8. The radio frequency accelerator of claim 6, wherein, An outer thread is arranged on the outer surface of the optical fiber; the optical fiber connector is a plug-in pipe, an inner thread is arranged on the inner wall of the plug-in pipe, the inner thread is matched with the outer thread of the optical fiber, and the diameter of the plug-in pipe is matched with the hole diameter of the through hole.

9. The radio frequency accelerator of any one of claims 6 to 8, wherein, The optical fiber is a POF optical fiber, and the optical fiber connector is an FC type.

10. The radio frequency accelerator of claim 1, wherein, The observation window comprises quartz glass, and the glass thickness is any value in the range of 2-4 mm.

Images