A beam position and flux intensity measuring device for radiation zone

Abstract

The present invention relates to a beam position and current intensity measurement device for a radiation zone, which comprises: a shielding guide assembly, used to block radioactive ions and protect external devices placed near the device; a hoist, arranged on the top of the shielding guide assembly, and a crane hoists and transports the device through the hoist; a target head and transmission assembly, arranged on the top of the shielding guide assembly, located in the middle of the hoist, and used to drive the target head assembly and the current intensity probe to move. The present invention has a simple and reliable structure, stronger radiation resistance, convenient hoisting and replacement, and can effectively ensure the normal operation of the accelerator. The present invention can be widely used in the field of accelerator technology.

Description

Technical Field

[0001] The invention relates to the technical field of accelerators, in particular to a beam position and current intensity measuring device used in a strong radiation zone of an accelerator. Background Art

[0002] In the high-intensity heavy ion accelerator facility (HIAF), the radioactive secondary beam separator (HFRS) uses high-energy and high-intensity heavy ion beams to generate secondary beams. Most of the beams will be lost in this position during the beam target experiment, so this area has a very high radioactivity. At the same time, it is required to measure the position and intensity of the target beam. The extremely strong radioactivity on the secondary beam line will cause damage to the motors and electronic components of the measuring equipment, which requires frequent maintenance and replacement.

[0003] At the accelerator radioactive beamline site, operators cannot enter the strong radiation environment to repair and replace equipment for a long time after shutdown. They need to cool down for many days and wait until the radiation dose drops to a safe range before they can enter. This will make the accelerator's operating efficiency abnormally low. It is of great significance to design a radiation-resistant device that can be used to measure beam position and flux, and ensure that the equipment in the radiation area operates more stably and reliably. Therefore, it is urgent to design a beam position and flux measurement device that can be used in a strong radiation environment. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a beam position and current intensity measuring device for the strong radiation zone of an accelerator. The device has a simple and reliable structure, stronger radiation resistance, is convenient for lifting and replacement, and can effectively ensure the normal operation of the accelerator.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a beam position and current intensity measuring device for a radiation zone, comprising: a shielding guide assembly, used to block radioactive ions and protect external devices placed near the device; a hoist, arranged on the top of the shielding guide assembly, and a crane hoists and transports the device through the hoist; a target head and transmission assembly, arranged on the top of the shielding guide assembly, located in the middle of the hoist, and used to drive the target head assembly and the current intensity probe to move.

[0006] Furthermore, it also includes a vacuum chamber; the overhead crane hoists the device into the vacuum chamber through the hoist; flange interfaces are respectively provided on both sides of the vacuum chamber, which are connected to the accelerator beam pipeline through the flange interfaces, and the device and the flange interfaces are sealed by being pressed by their own weight.

[0007] Furthermore, the lifting device and the shielding guide assembly, and the target head and transmission assembly and the shielding guide assembly are fixedly and sealedly connected by sealing flanges.

[0008] Furthermore, the target head and transmission assembly include a linear drive structure, a sealing flange, a camera and a camera shielding iron, a transmission rod, a transmission rod guide, a target head assembly and a current intensity probe; the linear drive structure and the camera and the camera shielding iron are fixed to the shielding guide assembly through the sealing flange; the linear drive structure is connected to the first end of the transmission rod to drive the transmission rod to move; the second end of the transmission rod passes through the internal hole of the shielding guide assembly and is connected to the target head assembly and the current intensity probe; the transmission rod guide is arranged on the transmission rod, close to the second end of the transmission rod, and is used to provide support and guidance for the transmission rod to ensure the position of the target head assembly and the current intensity probe.

[0009] Furthermore, the linear drive structure includes a screw guide module, a vacuum bellows, a displacement sensor and a motor; the transmission rod is inserted into the bellows and connected to one end of the bellows; the other end of the bellows is fixedly connected to a slider in the screw guide module, and the motor drives the slider in the screw guide module to move linearly along the guide rail, thereby driving the bellows to perform compression and elongation movement, so as to drive the transmission rod together with the target head assembly and the flow intensity probe to move up and down; the displacement sensor is arranged on the screw guide module to monitor the movement of the bellows.

[0010] Furthermore, a vacuum observation window is provided on the sealing flange to enable the camera to observe the internal target head; a flange connection interface is provided on the upper end of the sealing flange, and the bellows in the linear drive structure is sealed and connected to the sealing flange through the flange connection interface.

[0011] Furthermore, the camera and the camera shielding iron are arranged at the upper end of the sealing flange; the camera and the camera shielding iron include a camera and a camera shielding iron; the camera is arranged inside the camera shielding iron and aligned with the vacuum observation window on the sealing flange.

[0012] Furthermore, the target head assembly is fixed to the second end of the transmission rod through a connecting piece, and the target head assembly is arranged at 45 degrees to the beam direction; the target head assembly consists of a fixed bracket and alumina ceramics, and the fixed bracket is in the form of a transparent ring.

[0013] Furthermore, the current intensity probe includes a probe bracket, a shielding tube assembly and an internal membrane ring assembly; the top of the probe bracket is connected to the second end of the transmission rod; the shielding tube assembly adopts an annular structure and is arranged in the probe bracket to achieve shielding of internal signals; the internal membrane ring assembly includes three layers of metal membrane frames and insulating support rods; the three layers of the metal membrane frames are arranged at equal intervals, and adjacent metal membrane frames are isolated and connected to each other by the insulating support rods; each metal membrane frame is composed of a supporting ring and a clamping ring, and the contact surface has an inclination; a piece of metal film is sandwiched between the support ring and the clamping ring, and the metal film is flattened and compressed by the inclination structure.

[0014] Furthermore, it also includes a protection frame, which is arranged at the front end of the shielding guide assembly to protect the target head assembly and the current intensity probe at the front end during hoisting.

[0015] The present invention adopts the above technical solution, which has the following advantages:

[0016] 1. The device of the present invention can measure the position and intensity of high-energy strong beam according to experimental requirements to ensure the smooth progress of the target shooting experiment. The equipment is equipped with shielding iron and lifting guide. The shielding iron can effectively reduce the damage of radiation to external electrical components and increase the service life; the lifting guide meets the remote automatic lifting of the overhead crane, greatly improves the work efficiency and reduces the operating cost of the accelerator.

[0017] 2. The device of the present invention is equipped with shielding iron and lifting guide. At the same time, the external drive is a radiation-resistant all-metal drive mechanism. The shielding iron can effectively protect the external electrical components in the strong radiation area and increase the service life. The lifting guide meets the remote automatic lifting of the components by the overhead crane.

[0018] 3. The target head used in the device of the present invention is ultra-thin alumina ceramic. When a high-energy strong current beam passes through the target head, the target head emits light to monitor the beam position. The power deposited on the target head is very small and will not cause damage to the target head.

[0019] 4. The current intensity probe used in the device of the present invention adopts a three-layer membrane structure. The metal film generates secondary electrons when the beam passes through, thereby monitoring the beam current intensity. The high-energy and high-current ion beam will not damage the probe when passing through the film. The probe structure is simple and reliable, and there are no other electronic components.

[0020] In summary, the present invention can meet the requirements of automatic lifting and realize the monitoring of beam intensity and position on the secondary beam line before beam targeting; it has the characteristics of simple structure, easy use, high reliability, high work efficiency and low cost, and can provide reliable services for accelerator beam experiments and machine protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a general schematic diagram of a beam position and current intensity measurement device for a high-current accelerator radiation zone provided by an embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the hoisting of a beam position and current intensity measurement device for a high-current accelerator radiation zone provided by an embodiment of the present invention;

[0023] Figure 3 It is a structural diagram of the transmission mechanism of a beam position and current intensity measuring device for a high-current accelerator radiation zone provided by one embodiment of the present invention, excluding the shielding iron and the hanging device;

[0024] Figure 4 It is a schematic diagram of the installation of a camera for measuring the beam position and current intensity in the radiation zone of a high-current accelerator provided by an embodiment of the present invention;

[0025] Figure 5 It is a schematic diagram of a current intensity probe of a beam position and current intensity measurement device for a high-current accelerator radiation zone provided by an embodiment of the present invention;

[0026] Figure 6 It is a cross-sectional view of a current intensity probe of a beam position and current intensity measurement device for a high-current accelerator radiation zone provided by one embodiment of the present invention;

[0027] Figure 7 It is a schematic diagram of a current intensity probe membrane frame ring of a beam position and current intensity measurement device for a high-current accelerator radiation zone provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] The invention discloses a beam position and current intensity measuring device for a high-current accelerator radiation zone, including a shielding iron guide assembly, a hanger, a target head and a transmission assembly, a protective frame, etc.; the shielding iron can effectively reduce the damage of radiation to external electrical components and increase the service life. The shielding iron is composed of a plurality of bars, and guide balls are arranged on both sides of the shielding iron, so that the automatic lifting of the beam position and current intensity measuring device can be realized; the hanger is arranged at the top of the device and connected with the sealing flange; the target head and the transmission assembly include a linear drive assembly, a sealing flange, a camera and a shielding iron, a transmission rod, a transmission rod guide, a target head assembly, a current intensity probe, etc. The linear drive assembly includes a screw guide rail module, a vacuum bellows, a displacement sensor, a motor, etc. The transmission rod is arranged inside the bellows, connected to the tail of the bellows, and connected to the internal target head and the current intensity probe through the internal hole of the shielding iron. The vacuum bellows assembly is driven by the linear drive assembly to perform linear telescopic motion to drive the transmission rod and the target head to move up and down; the target head assembly is arranged at 45 degrees, and the target head assembly is composed of a fixed bracket and an alumina ceramic with a thickness of 0.2-03mm. The current intensity probe includes a probe bracket, a shielding tube assembly and an internal membrane ring assembly. The device monitors the position and flow intensity of the strong current beam through the target head and the current intensity probe, and has online testing and offline functions.

[0031] In one embodiment of the present invention, Figure 1 As shown, a device for measuring the beam position and current intensity in the strong radiation area of ​​an accelerator is provided. In this embodiment, the device includes:

[0032] A shielding guide assembly 1, used to block radioactive ions and protect external devices placed near the device;

[0033] A hoist 2 is arranged on the top of the shielding guide assembly 1, and the overhead crane hoists and transports the device through the hoist 2;

[0034] The target head and transmission assembly 3 is arranged on the top of the shielding guide assembly 1 and located in the middle of the hanger 2, and is used to drive the target head assembly 36 and the current intensity probe 37 to move.

[0035] In the above embodiment, Figure 2 As shown, the device in this embodiment also includes a vacuum chamber 5. The overhead crane hoists the beam position and flux device into the vacuum chamber 5 through the hoist 2, and realizes installation and fixation on the accelerator beam line. Flange interfaces 51 are respectively provided on both sides of the vacuum chamber 5, which are connected to the accelerator beam pipeline through the flange interfaces 51, and the device and the flange interface 51 are sealed by self-weight compression. A set of independent beam position and flux measurement devices can be installed in the vacuum chamber 5 in this embodiment.

[0036] In the above embodiment, the shielding guide assembly 1 is composed of a plurality of shielding irons, which are used to block radioactive ions, effectively protecting motors, electronic and electrical components, etc. placed outside near the equipment, thereby extending the service life of the equipment; guide balls are arranged on both sides of the shielding guide assembly 1, which cooperate with the guide grooves inside the vacuum chamber 5 to realize automatic lifting of the blocking elements.

[0037] In this embodiment, the specific structure of the guide ball has been disclosed in the document with patent application number 202011155076.3 and will not be repeated here.

[0038] In the above embodiment, the sealing flange 32 is used to fix and seal the connection between the hanger 2 and the shielding guide assembly 1 , and between the target head and the transmission assembly 3 and the shielding guide assembly 1 .

[0039] In the above embodiment, Figure 3 As shown, the target head and transmission assembly 3 includes a linear drive structure 31, a sealing flange 32, a camera and a camera shielding iron 33, a transmission rod 34, a transmission rod guide 35, a target head assembly 36 and a current intensity probe 37.

[0040] The linear drive structure 31 and the camera and the camera shielding iron 33 are all sealed and fixed on the shielding guide assembly 1 through the sealing flange 32;

[0041] The linear drive structure 31 is connected to the first end of the transmission rod 34 to drive the transmission rod 34 to move;

[0042] The second end of the transmission rod 34 passes through the inner hole of the shielding guide assembly 1 and is connected to the target head assembly 36 and the current intensity probe 37;

[0043] The transmission rod guide 35 is disposed on the shielding iron assembly 1 , close to the second end of the transmission rod 34 , and is used to provide support and guidance for the transmission rod 34 , thereby ensuring the positions of the target head assembly 36 and the current intensity probe 37 .

[0044] In the above embodiment, the linear drive structure 31 includes a lead screw guide rail module 311 , a bellows 312 , a displacement sensor 313 , a motor 314 and the like.

[0045] The transmission rod 34 is inserted into the bellows 312 and connected to one end of the bellows 312;

[0046] The other end of the bellows 312 is fixedly connected to the slider in the screw guide rail module 311. The motor 314 drives the slider in the screw guide rail module 311 to move linearly along the guide rail, thereby driving the bellows 312 to perform compression and extension movements, so as to drive the transmission rod 34 together with the target head assembly 36 and the current intensity probe 37 to move up and down, thereby realizing the online and offline functions of the target head. When measurement is not required, the target head returns to the offline position.

[0047] The displacement sensor 313 is disposed on the lead screw guide rail module 311 to monitor the movement of the bellows 312 .

[0048] In this embodiment, the lead screw guide rail module 311 is made of all metal, which can effectively prevent radiation damage.

[0049] In the above embodiment, a vacuum observation window 321 is provided on the sealing flange 32, which is used to enable the camera to observe the internal target head;

[0050] A flange connection interface is provided at the upper end of the sealing flange 32 , and the bellows 312 in the linear drive structure 31 is sealed and connected to the sealing flange 32 via the flange connection interface.

[0051] In the above embodiment, Figure 4 As shown, the camera and the camera shielding iron 33 are arranged at the upper end of the sealing flange 32; the camera and the camera shielding iron 33 include a camera 331 and a camera shielding iron 332; the camera 331 is arranged inside the camera shielding iron 332 and is aligned with the vacuum observation window 321 on the sealing flange 32. The camera 331 is an ordinary small camera, and the double-layer protection of the guide shielding iron and the camera shielding iron 332 below can effectively extend the service life of the camera 331.

[0052] In the above embodiment, the target head assembly 36 is fixed to the second end of the transmission rod 34 through a connecting piece. The target head assembly 36 is arranged at 45 degrees to the beam direction. When the beam passes through the target head, light is emitted. The beam spot shape can be observed from a camera placed vertically above, thereby confirming the position and shape of the beam.

[0053] The target head assembly 36 is composed of a fixed bracket and alumina ceramics, and the fixed bracket is in the form of a transparent ring. Preferably, the fixed bracket is a metal fixed bracket, and the thickness of the alumina ceramic is 0.2-03mm. When in use, the fixed bracket is in the form of a transparent ring, which can avoid the metal fixed bracket from blocking the beam.

[0054] Among them, the target head is ultra-thin alumina ceramic. When a high-energy and high-current beam passes through the target head, the target head emits light to monitor the beam position. The power deposited on the target head is very small and will not cause damage to the target head.

[0055] In the above embodiment, Figures 5 to 7 As shown, the current intensity probe 37 includes a probe bracket 371, a shielding tube assembly 372 and an internal membrane ring assembly 373. Among them:

[0056] The top of the probe bracket 371 is connected to the second end of the transmission rod 34;

[0057] The shielding tube assembly 372 adopts an annular structure and is disposed in the probe bracket 371 to shield the internal signal;

[0058] The internal membrane ring assembly 373 includes three layers of metal membrane frames 374 and insulating support rods 375; the three layers of metal membrane frames 374 are arranged at equal intervals, and adjacent metal membrane frames 374 are isolated and connected to each other through the insulating support rods 375;

[0059] Each metal film frame 374 is composed of a support ring and a clamping ring, and the contact surface has a preset slope; a very thin metal film is sandwiched between the support ring and the clamping ring, and the metal film is flattened and compressed by the slope structure.

[0060] A shielding cover is provided in the shielding tube assembly 372; the shielding cover adopts an annular structure to ensure the effective path of the beam under normal circumstances.

[0061] When in use, the current intensity probe 37 adopts a three-layer membrane structure. The metal membrane generates secondary electrons when the beam passes through, thereby monitoring the beam current intensity. High voltage is applied to the metal membranes on both sides to suppress the escape of secondary electrons. The metal membrane in the middle is used to collect secondary electron signals, thereby determining the beam current intensity. When a high-energy, high-current ion beam passes through a thin metal membrane, very little energy is lost and very little heat is generated, which will not damage the probe. The probe structure is simple and reliable.

[0062] In the above embodiment, the device of the present invention further comprises a protection frame 4, which is arranged at the front end of the shielding guide assembly 1 to protect the target head assembly 36 and the current intensity probe 37 at the front end from being damaged by collision during hoisting.

[0063] In a preferred embodiment of the present invention, the device of the present invention also includes a motion control system and an electronics system, which are configured to control the operation of the entire device and the acquisition of signals; realize the movement of the target head and the transmission assembly 3, and then drive the entire blocking target head assembly 36 and the current intensity probe 37 to move up and down inside the vacuum, thereby realizing the online and offline functions of the target head; and monitor the position status and beam current intensity information of the target head by reading and processing the signal of the current intensity probe 37.

[0064] In summary, when the present invention is used, Figure 1 , Figure 2 As shown, the crane is used to hoist the Figure 1The independent measuring device shown is connected to the vacuum chamber 5; the flange interfaces 51 on both sides of the vacuum chamber 5 are connected to the accelerator beam pipeline, and are sealed with the vacuum chamber 5 by self-weight compression. The motor 314 drives the linear drive structure 31 to move linearly, driving the bellows 312 to make telescopic movements, driving the transmission rod 34 and the target head assembly 36 and the current probe 37 to move up and down, realizing the online and offline functions of the target head. The target head emits light when the beam passes through, thereby confirming the position and shape of the beam; the current probe confirms the current intensity of the beam by collecting the secondary electrons generated by the thin film. In summary, the present invention can meet the requirements of automatic lifting and realize the position and current intensity measurement of the strong beam in the radiation zone; it has the characteristics of simple structure, easy use, high reliability, and low cost, and can provide reliable services for accelerator beam experiments and machine protection.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for measuring beam position and flux intensity in a radiation zone, characterized in that: include: A shielding guide assembly (1) for blocking radioactive ions and protecting external devices placed near the device; A lifting device (2) is arranged on the top of the shielding guide assembly (1), and an overhead crane lifts and transports the device through the lifting device (2); The target head and transmission assembly (3) is arranged on the top of the shielding guide assembly (1) and located in the middle of the hanger (2), and is used to drive the target head assembly (36) and the current intensity probe (37) to move; The target head and transmission assembly (3) comprises a linear drive structure (31), a sealing flange (32), a camera and a camera shielding iron (33), a transmission rod (34), a transmission rod guide (35), a target head assembly (36) and a current intensity probe (37); The linear drive structure (31) and the camera and camera shielding iron (33) are all fixed to the shielding guide assembly (1) via the sealing flange (32); The linear drive structure (31) is connected to the first end of the transmission rod (34) to drive the transmission rod (34) to move; The second end of the transmission rod (34) passes through the inner hole of the shielding guide assembly (1) and is connected to the target head assembly (36) and the current intensity probe (37); The transmission rod guide (35) is arranged on the transmission rod (34) near the second end of the transmission rod (34) and is used to provide support and guidance for the transmission rod (34) to ensure the position of the target head assembly (36) and the current intensity probe (37); The linear drive structure (31) comprises a lead screw guide rail module (311), a vacuum bellows (312), a displacement sensor (313) and a motor (314); The transmission rod (34) is inserted into the bellows (312) and connected to one end of the bellows (312); The other end of the bellows (312) is fixedly connected to a slider in the screw guide rail module (311), and the motor (314) drives the slider in the screw guide rail module (311) to move linearly along the guide rail, thereby driving the bellows (312) to perform compression and extension movement, thereby driving the transmission rod (34) together with the target head assembly (36) and the current intensity probe (37) to move up and down; The displacement sensor (313) is arranged on the lead screw guide rail module (311) and is used to monitor the movement of the bellows (312); The target head assembly (36) is fixed to the second end of the transmission rod (34) through a connecting piece, and the target head assembly (36) is arranged at 45 degrees to the beam direction; The target head assembly (36) is composed of a fixed bracket and alumina ceramics, and the fixed bracket is in the form of a transparent ring; The current intensity probe (37) comprises a probe bracket (371), a shielding tube assembly (372) and an internal membrane ring assembly (373); The top of the probe bracket (371) is connected to the second end of the transmission rod (34); The shielding cylinder assembly (372) adopts an annular structure and is arranged in the probe bracket (371) to shield the internal signal; The internal membrane ring assembly (373) comprises three layers of metal membrane frames (374) and insulating support rods (375); the three layers of the metal membrane frames (374) are arranged at equal intervals, and adjacent metal membrane frames (374) are isolated and connected to each other through the insulating support rods (375); Each of the metal film frames (374) is composed of a support ring and a clamping ring, and the contact surface has an inclination; a metal film is sandwiched between the support ring and the clamping ring, and the metal film is flattened and compressed by the inclination structure.

2. The beam position and current intensity measuring device for a radiation zone as claimed in claim 1, characterized in that: It also includes a vacuum chamber (5); the overhead crane hoists the device into the vacuum chamber (5) through the hoist (2); Flange interfaces (51) are respectively provided on both sides of the vacuum chamber (5), and are connected to the accelerator beam pipeline via the flange interfaces (51); the device and the flange interfaces (51) are sealed by being compressed by their own weight.

3. The beam position and current intensity measuring device for a radiation zone as claimed in claim 1, characterized in that: The lifting device (2) and the shielding guide assembly (1), as well as the target head and transmission assembly (3) and the shielding guide assembly (1) are fixedly and sealedly connected by means of sealing flanges (32).

4. The beam position and current intensity measuring device for a radiation zone as claimed in claim 1, characterized in that: The sealing flange (32) is provided with a vacuum observation window (321) for enabling the camera to observe the internal target head; The upper end of the sealing flange (32) is provided with a flange connection interface, and the bellows (312) in the linear drive structure (31) is sealed and connected to the sealing flange (32) via the flange connection interface.

5. The device for measuring beam position and current intensity in a radiation zone according to claim 4, characterized in that: The camera and the camera shielding iron (33) are arranged on the upper end of the sealing flange (32); The camera and camera shielding iron (33) comprise a camera (331) and a camera shielding iron (332); the camera (331) is arranged inside the camera shielding iron (332) and is aligned with the vacuum observation window (321) on the sealing flange (32).

6. The beam position and current intensity measuring device for a radiation zone as claimed in claim 1, characterized in that: It also comprises a protection frame (4) which is arranged at the front end of the shielding guide assembly (1) and protects the target head assembly (36) and the current intensity probe (37) at the front end during hoisting.

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