Compact superconducting cyclotron cavity for isotope production

Abstract

The invention relates to a compact superconducting cyclotron cavity for isotope production. Comprising a shell, a Dee plate, a head connecting block, a tail connecting block, a framework, an inner rod, a fixed capacitance tuner, a movable capacitance tuner and a coupler. The shell comprises a spiral shell upper plate and a spiral shell lower plate which are symmetrical up and down; the Dee plate is parallel to the shell upper plate and the shell lower plate, is positioned between the shell upper plate and the shell lower plate, and comprises a spiral upper Dee plate and a spiral lower Dee plate which are symmetrical up and down; the head connecting block is arranged at the head of the Dee plate and is connected with the upper Dee plate and the lower Dee plate; the tail connecting block is arranged at the tail part of the Dee plate and is connected with the upper Dee plate and the lower Dee plate; the framework is arranged between the upper Dee plate and the lower Dee plate so as to support the upper Dee plate and the lower Dee plate; the shell is connected with the Dee plate through an inner rod, and the inner rod is of a vertically symmetrical structure. The invention provides an efficient and stable cavity for the high-energy high-current cyclotron.

Description

TECHNICAL FIELD

[0001] The present application relates to a superconducting cyclotron, in particular, to a compact superconducting cyclotron cavity for isotope production. BACKGROUND

[0002] With the rapid development of radioisotope production, heavy ion cancer treatment and other fields, the demand for high-energy high-current beams is increasingly urgent. Due to its low cost and high stability, the high-current cyclotron becomes an ideal choice for isotope production. The high-frequency system, as the core component of the cyclotron, is responsible for providing the required energy for ion acceleration. In order to meet the demand of isotope production, the cyclotron needs to maintain stable operation under high-energy and high-current conditions.

[0003] However, the traditional cavity has many technical defects in large-scale design: Firstly, the volume and weight increase significantly, making it difficult to maintain compactness. At the same time, under large volume and high current conditions, the cavity is prone to structural deformation, which affects the stability of long-term operation of the cavity; In addition, in large-scale design, machining errors will significantly affect the cavity frequency, leading to frequency deviation problems, making it difficult to meet the precise frequency requirements; Finally, in the traditional cavity design, the height of the inner rod and other components may exceed the cavity, requiring holes to be opened on the magnet, thereby interfering with the magnetic field of the cyclotron.

[0004] These defects are particularly prominent in compact superconducting cyclotrons, limiting their application in isotope production. SUMMARY

[0005] To solve the above problems, the present application aims to address the technical challenges of large-scale superconducting cyclotron high-frequency systems under high-energy and high-current conditions, particularly the problems of large volume, weight increase, insufficient structural stability, and frequency deviation caused by machining errors in traditional cavity design. The present application proposes a compact superconducting cyclotron cavity for isotope production. By optimizing the structural design, the stability and frequency adjustment range of the cavity are improved to meet the demand of isotope production.

[0006] To achieve the above-mentioned purposes, the present application adopts the following technical solutions: A compact superconducting cyclotron cavity for isotope production, comprising: a shell, the shell comprising an upper and lower symmetrical spiral shell upper plate and a shell lower plate, the head of the shell being a small radius magnetic pole end, and the tail of the shell being a large radius magnetic pole end; a Dee plate, the Dee plate being arranged parallel to the shell upper plate and the shell lower plate and located between the shell upper plate and the shell lower plate, the Dee plate comprising an upper and lower symmetrical spiral upper Dee plate and a lower Dee plate; a head connecting block arranged at a head of the Dee plate and connected with the upper Dee plate and the lower Dee plate; a tail connecting block arranged at a tail of the Dee plate and connected with the upper Dee plate and the lower Dee plate; a framework arranged between the upper Dee plate and the lower Dee plate to support the upper Dee plate and the lower Dee plate, and a surface of the framework is covered with a surface plate; an inner rod connecting the shell with the Dee plate, the inner rod being symmetrical in up and down, and the inner rod comprising a first inner rod and a second inner rod arranged at intervals; a fixed capacitance tuner arranged on the shell and close to the tail of the Dee plate; a movable capacitance tuner arranged on the shell and close to the head of the Dee plate, the movable capacitance tuner comprising two movable capacitance tuners symmetrical in up and down, and each movable capacitance tuner being connected with a motor; a coupler arranged on the shell.

[0007] Preferably, the lower Dee plate of the Dee plate is fixedly connected with the head connecting block, the upper Dee plate of the Dee plate is movably connected with the head connecting block by a spring, the upper Dee plate of the Dee plate is fixedly connected with the tail connecting block, and the lower Dee plate of the Dee plate is movably connected with the tail connecting block by a spring.

[0008] Preferably, the spring is a high-frequency spring, and the structural stability is enhanced by gravity micro-depression.

[0009] Preferably, the height of the first inner rod is equal to the height of the second inner rod, and the height of the first inner rod is consistent with the height of the cavity, so as to reduce the interference of the opening on the magnetic field of the cyclotron.

[0010] Preferably, the cross-sectional shape of the inner rod is "similar to a racetrack", so as to enhance the supportability.

[0011] Preferably, the number, position and size of the inner rod are adjusted, and the cavity is optimized to the required frequency and voltage distribution in simulation.

[0012] Preferably, 1 to 3 fixed tuners are arranged, which are used for frequency coarse adjustment to correct the frequency deviation caused by machining errors when the cavity is cold measured.

[0013] Preferably, two movable capacitance tuners symmetrical in up and down are arranged, which are used for dynamic fine adjustment of frequency to ensure that the requirements of cavity tuning accuracy and frequency stability are met.

[0014] Preferably, water channels are evenly distributed on the shell, the Dee plate, the fixed tuner, the movable capacitance tuner and the coupler, so as to reduce the cavity frequency drift caused by thermal deformation.

[0015] Preferably, the height of the shell at the pole end of the major radius valley region is reduced, so that the tail of the shell is recessed symmetrically to the middle by one third on both sides.

[0016] The present application has the following advantages due to the above technical solutions: The present application solves the problems of large volume, weight increase, insufficient structural stability, frequency deviation caused by machining error, etc. of the traditional cavity in large-scale design by optimizing the structural design of the high-frequency cavity, and is particularly suitable for superconducting cyclotron under high-energy and high-current conditions.

[0017] The present application provides an efficient and stable cavity solution for high-energy and high-current cyclotrons. BRIEF DESCRIPTION OF DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments, and are not meant to limit the present application. Throughout the drawings, the same reference designators are used to denote like elements. In the drawings: Figure 1 is a structural schematic diagram of a cavity according to an embodiment of the present application; Figure 2 is a cavity and Dee plate head section view according to an embodiment of the present application; Figure 3 is a Dee plate support schematic diagram according to an embodiment of the present application; Figure 4 is a Dee plate tail and connecting block section view according to an embodiment of the present application; Figure 5 is a Dee plate section view according to an embodiment of the present application.

[0019] The various signs in the drawings represent the following: Shell 1 Dee plate 2 Tail connecting block 3 First inner rod 4 Second inner rod 5 Fixed capacitance tuner 6 Moving capacitance tuner 7 Coupler 8 Framework 9 Spring 10 Coating plate 11 Head connecting block 12 Electrode 13 DETAILED DESCRIPTION Exemplary embodiments of the present application will be described more fully hereinafter with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it is to be understood that the present application can be embodied in various forms without being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art. In the following description, while the examples of the present disclosure will be described in detail with reference to the accompanying drawings, it should be noted that the examples are not limited thereto.

[0020] The following detailed description is provided to help the reader understand the method, apparatus and / or system described herein. However, various changes, modifications and equivalents can be resorted to by those skilled in the art after understanding the disclosure. For example, the order of the operations described herein can be changed, except that the operations must occur in the particular order as necessary to achieve the desired result, and the present disclosure is not limited to the order of operations set forth herein, as will be apparent to those skilled in the art. Also, descriptions of features in the following detailed description should not be interpreted to mean that the features are essential to the disclosure, unless the claim explicitly states that the feature is essential.

[0021] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, these examples are provided so that this disclosure will be thorough and complete, and will fully convey the intended scope of the methods, apparatus and / or systems described herein to those skilled in the art, after understanding the disclosure.

[0022] Throughout the specification, when an element is described as being "on," "connected to," or "coupled to" another element, it can be directly on, connected or coupled to the other element, or one or more other elements can be interposed between the element and the other element. Conversely, when an element is described as being "directly on," "directly connected to," or "directly coupled to" another element, then no other elements are interposed between the element and the other element.

[0023] As used herein, the phrase "and / or" includes any one of the associated listed items, as well as any combination of any two or more of the associated listed items; likewise, "at least one of" includes any one of the associated listed items, as well as any combination of any two or more of the associated listed items.

[0024] Although terminology can be used in this disclosure, such as "first," "second," and "third," to describe various components, parts, regions, layers or sections, such components, parts, regions, layers or sections are not limited by the terminology. Rather, such terminology is used to distinguish one component, part, region, layer or section from another component, part, region, layer or section. Thus, a first component, part, region, layer or section mentioned in examples can also be called a second component, part, region, layer or section without departing from the teachings of the examples described herein.

[0025] Spatially relative terms such as "on", "upper", "lower", "below", "above", "top", "bottom", and the like can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Such spatially relative terms are not intended to limit the scope or meaning of the examples described herein unless specifically stated to do so. Thus, a device can be described as being "on" another device or element, or "above" another device or element, or "below" another device or element, without regard to the specific orientation of the device or element. The spatially relative terms are intended to encompass different orientations of the device in use or operation, for example, dependent on the particular orientation of the device or element being referred to. Thus, a device described as being "above" another device or element can be oriented above, below, or otherwise in relation to the other device or element depending on the particular orientation of the device or element. The spatially relative terms are intended to encompass different orientations of the device in use or operation, and to cover the various modifications and configurations of the examples described herein. For example, if a device is described as being "above" another device or element, the device can be oriented above, below, or otherwise in relation to the other device or element depending on the particular orientation of the device or element. Thus, the spatially relative terms are intended to encompass different orientations of the device in use or operation, and to cover the various modifications and configurations of the examples described herein.

[0026] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terms "comprise", "comprising", "include", "including", and "has", "having" as used herein, are specifically intended to be open-ended and also to mean including, but not limited to. Unless otherwise stated, the terms "one", "a", and "the" are used in the same manner as the term "comprising" to mean one or more.

[0027] Variations can occur in the shapes of the elements depicted in the figures due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not intended to be bound by the specific shapes of the elements depicted in the figures, but are to include variations in shapes that would be within the scope of what is described herein.

[0028] It should be noted that, in this document, the use of the phrase "may", for example with respect to examples that can include or implement something, means that at least one example exists that includes or implements that feature, and that all examples are not limited in this manner.

[0029] The features of the examples described herein can be combined in a variety of ways as will be apparent after the disclosure is understood. Moreover, although examples described herein have a variety of configurations, other configurations are possible in light of the disclosure.

[0030] The cavity of the present application comprises the following components: The shell 1, the Dee plate 2, the head connecting block 12, the tail connecting block 3, the framework 9, the surface plate 11, the first inner rod 4, the second inner rod 5, the fixed capacitance tuner 6, the moving capacitance tuner 7 and the coupler 8.

[0031] The shell 1 is a spiral-shaped cavity which is symmetrical in the up-down direction.

[0032] The Dee plate 2 is a spiral-shaped plate which is symmetrical in the up-down direction.

[0033] The head of the spiral-shaped Dee plate 2 which is symmetrical in the up-down direction is connected by the head connecting block 12, and the tail of the spiral-shaped Dee plate 2 which is symmetrical in the up-down direction is connected by the tail connecting block 3.

[0034] The spiral-shaped Dee plate 2 which is symmetrical in the up-down direction is supported by the framework 9.

[0035] The surface plate 11 is covered on the surface of the framework.

[0036] The shell 1 and the Dee plate 2 are connected by inner rods, and the inner rods are symmetrical in the up-down direction. There can be multiple inner rods. In one embodiment of the present application, the first inner rod 4 and the second inner rod 5 are provided.

[0037] The fixed capacitance tuner 6 is provided on the shell 1, close to the tail of the Dee plate 2.

[0038] The moving capacitance tuner 7 is provided on the shell 1, close to the head of the Dee plate 2. In one embodiment of the present application, two moving capacitance tuners 7 which are symmetrical in the up-down direction are provided, and each of the moving capacitance tuners 7 is connected with a motor.

[0039] In one embodiment of the present application, the coupler 8 is also provided on the shell 1.

[0040] As shown in FIG. 1, the shell 1 forms a cavity in the shape of a spiral which is symmetrical in the up-down direction, so as to make full use of the valley space of the magnet to set the cavity. Figure 1

[0041] In one embodiment of the present application, the cavity is a high-frequency cavity.

[0042] The openings are provided on the shell 1 of the cavity which is set at the up-down position. The shape of the opening for the inner rod is "similar to a runway", and the shape of the opening for the moving capacitance tuner 7 and the coupler 8 is a circular hole. ​

[0043] To prevent the cavity from thermal deformation caused by temperature rise, a water channel is arranged along the edge of the acceleration gap in the cavity.

[0044] The water channel is mainly used for cooling the inner rod and the coupler, and can be arranged at the opening for the inner rod and at the opening for the coupler to reduce the temperature rise of the cavity.

[0045] To meet the structural requirements of the cavity, the thickness of the side copper plate of the upper and lower symmetrical spiral grounding shell 1 is 8 mm to enhance the overall rigidity of the cavity.

[0046] As shown in Figure 2 The shell 1 arranged at the head of the upper half of the cavity is movably connected with the electrode 13 of the central region through the spring 10. The shell 1 arranged at the head of the lower half of the cavity is fixedly connected with the electrode 13 of the central region. This is beneficial to the assembly of the cavity, and the electrode 13 of the central region can be replaced at any time according to the physical design requirements of the central region to meet the requirements of high-current injection.

[0047] As shown in Figure 2 To facilitate beam extraction, the height of the accelerator large-radius valley magnetic pole is reduced, which causes the upper and lower sides of the tail of the cavity to be recessed by one-third towards the middle. The thickness of the parallel support copper plate in the recessed part is 12 mm, and it can be used as a support for the cavity to enhance the structural stability.

[0048] As shown in Figure 2 The head connecting block 12 is fixedly connected with the lower Dee plate in the Dee plate 2, and the head connecting block 12 is movably connected with the upper Dee plate in the Dee plate 2 by the spring 10 to adapt to the shape of the separately designed head of the Dee plate in various working conditions.

[0049] In addition, according to the requirements of high-current injection dynamics, the height of the upper and lower Dee plates in the Dee plate 2 gradually changes from the small radius to the large radius, and the height at the small radius changes from 15 mm to 20 mm, and the height at the large radius gradually changes from 20 mm to 40 mm.

[0050] As shown in Figure 3 The spiral Dee plate 2 is fixed with the framework 9 by screws or welding.

[0051] In one embodiment according to the present application, the thickness of the framework 9 is 60 mm, and the surface of the framework 9 can be covered with the cladding plate 11.

[0052] The support structure of the framework 9 can be optimized, for example, the framework 9 is made of titanium alloy or aluminum alloy material to ensure the structural stability of the cavity.

[0053] The Dee plate 2 is cooled by multiple water channels. The cooling water pipes are placed on the Dee plate 2 according to thermal simulation. The pipes are concentrated at two inner rods and enter and exit the cavity through the openings for the inner rods.

[0054] The first inner rod 4 and the second inner rod 5 are spaced apart. In one embodiment according to the application, the first inner rod 4 and the second inner rod 5 have the same cross-sectional shape and size. In another embodiment according to the application, the first inner rod 4 and the second inner rod 5 have different cross-sectional shapes and sizes.

[0055] As shown in FIG. 1, the tail connecting block 3 of the Dee plate 2 can be replaced at any time according to assembly requirements. Figure 4

[0056] In one embodiment according to the application, the height of the tail connecting block 3 is 40 mm.

[0057] The upper Dee plate of the Dee plate 2 is fixedly connected with the tail connecting block 3 by screws, and the lower Dee plate of the Dee plate 2 is movably connected with the tail connecting block 3 by a spring 10.

[0058] In one embodiment according to the application, the spring 10 is a high-frequency spring. In one embodiment according to the application, the spring 10 is a high-frequency spring compressed by gravity micro-depression to enhance structural stability.

[0059] As shown in FIG. 2, the high-frequency spring can use a “β-shaped” spring to increase the spring compression amount and enhance high-frequency contact. Figure 4 As shown in FIG. 3, the height of the Dee plate 2 is 70 mm, and the shape is a “quasi-trapezoidal” structure to leave a design space for the skeleton 9, enhance the structural rigidity of the Dee plate 2, reduce the deformation of the tail of the Dee plate 2, and optimize the local electric field through chamfering to reduce the risk of sparking.

[0060] Figure 5 One part of the upper and lower symmetrical double inner rods is fixedly connected with the shell 1 of the cavity, and the other part of the upper and lower symmetrical double inner rods is fixedly connected with the Dee plate 2.

[0061] The inner rod shape is a “quasi-track-shaped” structure, which not only enhances the structural support and optimizes the voltage distribution, but also serves as a water cooling channel to concentrate the water cooling pipes of the Dee plate 2 and enter and exit from the “quasi-track-shaped” openings.

[0062] The water channel of the inner rod itself can be integrated on the “quasi-track-shaped” structure and cooled by methods such as flooding.

[0063] The water channel of the inner rod itself can be integrated on the “quasi-track-shaped” structure and cooled by methods such as flooding.

[0064] ​​Because the width of the Dee plate with small radius is small, a relatively small inner rod is arranged at the small radius and a relatively large inner rod is arranged at the large radius, which helps to adjust the voltage of the head of the cavity and enhance the support structure.

[0065] In addition, the heights of the first inner rod 4 and the second inner rod 5 are equal and consistent with the height of the cavity, thus avoiding the opening on the magnet and reducing the interference with the magnetic field of the cyclotron.

[0066] By adjusting the number, position and size of the inner rods, the cavity can be optimized to the required frequency and voltage distribution in simulation, to the voltage distribution with low voltage at the small radius and high voltage at the large radius, and to meet the physical requirements of the accelerator.

[0067] A plurality of fixed tuners 6 and two mobile capacitance tuners 7 are arranged in the cavity.

[0068] The fixed tuners 6 are connected to the tail of the spiral ground cavity.

[0069] One to three fixed tuners 6 can be arranged, and when the cold measurement is processed in the factory, the frequency can be coarsely adjusted by adjusting the size of the tuner and the distance from the tail of the Dee plate 2, and the frequency tuning of at least 500 kHz bandwidth can be realized to correct the frequency error caused by processing, so as to finally determine the size and position of the fixed tuner 6.

[0070] The two mobile capacitance tuners 7 can be symmetrically arranged above and below the spiral ground cavity.

[0071] Each of the two mobile capacitance tuners 7 is connected to an external servo motor, so it can move up and down in a large range. The servo motor adopts a linear motor module, and the up and down movement of the mobile capacitance tuner 7 is controlled by a driver, with a movement accuracy of 0.01 mm and a tuning accuracy of at least 0.05 kHz.

[0072] When the distance between the mobile capacitance tuner 7 and the Dee plate 2 is moved within the range of 30 mm-100 mm, the frequency tuning of at least 300 kHz bandwidth can be realized.

[0073] During the actual operation of the cavity, the distance between the mobile capacitance tuner 7 and the Dee plate 2 can be adjusted to realize dynamic fine tuning of the frequency, so as to ensure that the cavity tuning accuracy and frequency stability requirements are met.

[0074] Both the fixed tuner 6 and the mobile capacitance tuner 7 need to be water-cooled, and the cooling water realizes the cooling of the fixed tuner 6 and the mobile capacitance tuner 7 by means of flooding through the support rod.

[0075] The cavity is independently coupled, the coupler 8 is embedded at the tail of the upper part of the cavity, and by adjusting the area size of the coupling ring of the coupler 8 and by rotating the angle of the coupler 8, impedance matching between the transmission line and the cavity can be realized, so that the cavity reaches critical coupling.

[0076] When the input power is high, the self-heating of the coupler 8 cannot be ignored, and water cooling needs to be placed inside the coupling ring of the coupler 8 and on the coupler 8 itself to ensure the stability of the operation rate of the coupler 8. According to one embodiment of the present application, a high-frequency cavity with a frequency of 30 to 150 MHz, an unloaded quality factor greater than 10,000 and a tuning frequency greater than 800 kHz is allowed to be designed.

[0077] By optimizing the cavity structure, the compact superconducting cyclotron cavity for isotope production according to one embodiment of the present application improves the structural stability, can greatly correct the frequency deviation caused by the machining error, and provides a guarantee for the long-term stable operation of the cavity.

[0078] Key points of the present application: The recess design of the tail of the cavity: meet the shape requirements of the magnet tail, while enhancing the structural stability.

[0079] The "ladder-like" structure design of the spiral Dee plate 2: the design space is left for the skeleton 9, the Dee plate 2 and the skeleton 9 are fixed by welding or screw, the structure and material (titanium alloy or aluminum alloy) of the skeleton can be adjusted according to the requirement, the structural rigidity of the Dee plate 2 is enhanced, the tail deformation is reduced, and the local electric field is optimized through the round corner to reduce the risk of sparking.

[0080] The movable connection design: the head connecting block 12 and the upper Dee plate of the Dee plate 2 are movably connected by high-frequency springs, and the tail connecting block 3 and the lower Dee plate of the Dee plate 2 are movably connected by high-frequency springs, which can adapt to the shape of the head of the separately designed Dee plate 2 under various working conditions, and the structural stability is enhanced by the gravity micro-depression.

[0081] The "racetrack-like" structure design of the upper and lower symmetrical inner rods: one or more inner rods are used, the heights of the inner rods are equal and consistent with the height of the cavity, which can reduce the interference of the opening on the magnetic field of the cyclotron. At the same time, the "racetrack-like" structure of the inner rod can enhance the support. And by adjusting the number, position and size of the inner rod, the cavity can be optimized to the required frequency and voltage distribution in simulation.

[0082] Double-stage tuning system design: the combination design of tail fixed tuner 6 and upper and lower symmetrical movable capacitor tuner 7 is adopted, 1 to 3 fixed tuners 6 are needed for frequency coarse adjustment, and the frequency deviation caused by machining error is corrected during cavity cold measurement; the upper and lower symmetrical two movable capacitor tuners 7 are used for frequency fine adjustment, and the dynamic fine adjustment of frequency is realized to ensure that the cavity tuning accuracy and frequency stability requirements are met. The double-stage tuning system can provide at least 800 kHz bandwidth frequency tuning to ensure that the cavity frequency meets the requirements accurately.

[0083] Global water cooling design: in order to prevent excessive thermal deformation of the cavity caused by temperature rise, water channels are distributed on the shell 1, Dee plate 2, tuner, coupler 8 and other parts to reduce the cavity frequency drift caused by thermal deformation.

[0084] The application allows the design of a cavity with a frequency of 30 to 150 MHz, an unloaded quality factor greater than 10,000 and a tuning frequency greater than 800 kHz to meet the high-energy high-current acceleration requirements.

[0085] Although specific examples have been shown and described above, it will be apparent after understanding the present disclosure that various changes in form and details can be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be understood in a descriptive sense only and not for purposes of limitation. The description of features or aspects in each example should be considered as applicable to similar features or aspects in other examples. If the described techniques are performed in a different order, and / or if the components in the described systems, architectures, devices, or circuits are combined or substituted for one another or are supplemented, then an appropriate result is still achieved. Therefore, the scope of the present disclosure is not limited by the specific embodiments, but is defined by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are to be considered included in the present disclosure.

[0086] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent substitutions for part of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A compact superconducting cyclotron cavity for isotope production, characterized in that, The application relates to a revolving accelerator, which comprises the following parts: a shell, a Dee plate, a head connecting block, a tail connecting block, a framework, an inner rod, a fixed capacitor tuner, a movable capacitor tuner and a coupler. The shell comprises an upper and lower symmetrical spiral shell upper plate and a shell lower plate, the head of the shell is a small-radius magnetic pole end, and the tail of the shell is a large-radius magnetic pole end. The Dee plate is arranged in parallel with the shell upper plate and the shell lower plate and is located between the shell upper plate and the shell lower plate, and the Dee plate comprises an upper and lower symmetrical spiral upper Dee plate and a lower Dee plate. The head connecting block is arranged at the head of the Dee plate and is connected with the upper Dee plate and the lower Dee plate. The tail connecting block is arranged at the tail of the Dee plate and is connected with the upper Dee plate and the lower Dee plate. The framework is arranged between the upper Dee plate and the lower Dee plate to support the upper Dee plate and the lower Dee plate, and a coating plate is arranged on the surface of the framework. The shell and the Dee plate are connected through the inner rod, the inner rod is an upper and lower symmetrical structure, and the inner rod comprises a first inner rod and a second inner rod which are arranged at intervals. The fixed capacitor tuner is arranged on the shell and is close to the tail of the Dee plate. The movable capacitor tuner is arranged on the shell and is close to the head of the Dee plate, the movable capacitor tuner comprises two upper and lower symmetrical movable capacitor tuners, and each movable capacitor tuner is connected with a motor. The coupler is arranged on the shell.

2. A compact superconducting cyclotron cavity for isotope production according to claim 1, characterized in that, The lower Dee plate of the Dee plate is fixedly connected with the head connecting block, the upper Dee plate of the Dee plate is movably connected with the head connecting block through a spring, the upper Dee plate of the Dee plate is fixedly connected with the tail connecting block, and the lower Dee plate of the Dee plate is movably connected with the tail connecting block through a spring.

3. A compact superconducting cyclotron cavity for isotope production according to claim 2, characterized in that, The spring is a high-frequency spring, and the structural stability is enhanced by gravity micro-depression.

4. A compact superconducting cyclotron cavity for isotope production according to claim 1, characterized in that, The height of the first inner rod is equal to the height of the second inner rod and is consistent with the height of the cavity, so that the interference of the opening on the revolving accelerator magnetic field is reduced.

5. A compact superconducting cyclotron cavity for isotope production according to claim 1, wherein, The cross-sectional shape of the inner rod is "similar to a runway", so that the supportability is enhanced.

6. A compact superconducting cyclotron cavity for isotope production according to claim 1, characterized in that, The number, position and size of the inner rod are adjusted, and the cavity is optimized to the required frequency and voltage distribution during simulation.

7. A compact superconducting cyclotron cavity for isotope production according to claim 1, wherein, One to three fixed tuners are arranged and are used for frequency coarse adjustment, so that the frequency deviation caused by machining errors can be corrected when the cavity is cold measured.

8. A compact superconducting cyclotron cavity for isotope production according to claim 1, wherein, Two upper and lower symmetrical movable capacitor tuners are arranged and are used for dynamic fine adjustment of the frequency, so that the cavity tuning accuracy and frequency stability requirements can be ensured.

9. A compact superconducting cyclotron cavity for isotope production according to claim 1, wherein, Water channels are uniformly arranged on the shell, the Dee plate, the fixed tuner, the movable capacitor tuner and the coupler, so that the cavity frequency drift caused by thermal deformation is reduced.

10. A compact superconducting cyclotron cavity for isotope production according to claim 1, characterized in that, The height of the shell is reduced at the large-radius valley magnetic pole end, so that the tail of the shell is recessed to the middle by one third on the upper and lower sides.

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