Cavity chain structure for standing wave accelerating tube, standing wave accelerating tube and accelerator

Abstract

The utility model provides a cavity chain structure for a standing wave accelerating tube, the standing wave accelerating tube and an accelerator. The cavity chain structure comprises a plurality of bunching cavity units which are sequentially arranged along the direction of an electron beam. The coupling cavities are arranged between the adjacent bunching cavity units; the bunching cavity unit comprises a bunching cavity and a beam hole used for forming an electron beam channel. Beam bunching cavities of the beam bunching cavity units on the side, close to the electron gun, of the cavity chain structure are designed to be in an asymmetric cavity type in the electron beam current direction. The small focus design of the standing wave accelerating tube can be realized through the cavity chain structure.

Description

Technical Field

[0001] This utility model relates to the field of microwave vacuum electronics technology. More specifically, it relates to a cavity chain structure for a standing wave accelerator tube, a standing wave accelerator tube, and an accelerator. Background Technology

[0002] High-energy X-ray sources, due to their excellent penetrating power and imaging capabilities, have wide applications in fields such as medical and health care (e.g., radiotherapy and diagnostics), industrial non-destructive testing, food irradiation sterilization, and security inspection. Electron linear accelerators, as their core components, have demonstrated unique performance advantages through long-term technological optimization and engineering practice. However, the focal size of current mainstream electron linear accelerators is typically 1mm-2mm, resulting in limited spatial resolution and making it difficult to meet the increasingly demanding imaging requirements of modern high-precision testing equipment. Utility Model Content

[0003] To address the aforementioned issues, this invention provides a cavity chain structure for standing wave accelerator tubes that can control the focal spot size of the accelerator tube to within 0.5mm, thereby achieving a small focal spot design for the accelerator tube and improving spatial resolution.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This invention provides a cavity chain structure for a standing-wave accelerator tube, comprising multiple focusing cavity units arranged sequentially along the electron beam direction; and

[0006] Coupler cavity between adjacent focusing cavity units;

[0007] The focusing cavity unit includes a focusing cavity and a beam aperture for forming an electron beam channel;

[0008] The focusing cavity of the focusing cavity unit near the electron gun in the cavity chain structure has an asymmetric cavity design along the direction of the electron beam.

[0009] In a preferred embodiment, the aperture of the beam aperture near the electron gun in the first focusing cavity unit is larger than the aperture of the beam aperture away from the electron gun.

[0010] The preferred embodiment is that the number of focusing cavity units is n, where 3 ≤ n ≤ 5; the aperture of the beam aperture of the first focusing cavity unit near the electron gun is D1, where 4 mm ≤ D1 ≤ 5 mm; the aperture of the beam aperture of the first focusing cavity unit away from the electron gun is D2, where 3 mm ≤ D2 ≤ 3.5 mm; this cavity chain structure can control the focal size of the accelerating tube to within 0.5 mm.

[0011] The preferred embodiment is that the aperture of the beam aperture starting from the second focusing cavity unit is equal to the aperture of the beam aperture of the first focusing cavity unit that is furthest from the electron gun.

[0012] In a preferred embodiment, the length of the focusing cavity of the first focusing cavity unit along the electron beam direction is smaller than that of the focusing cavity of the adjacent focusing cavity unit along the electron beam direction; and from the second focusing cavity unit onwards, the length of the focusing cavity along the electron beam direction is the same.

[0013] In a preferred embodiment, the focusing cavity unit further includes two protruding structures formed on the two opposite cavity sidewalls of the focusing cavity and extending into the focusing cavity along the direction of the electron beam; the beam aperture penetrates through the protruding structures; the radial dimension of the protruding structure near the electron gun in the first focusing cavity unit is larger than the radial dimension of the protruding structure away from the electron gun; the two protruding structures in the focusing cavity units starting from the second focusing cavity unit are symmetrically arranged.

[0014] This utility model also provides a standing wave accelerator tube, including the cavity chain structure as described above; an electron gun and a target component respectively sealed and fixed at both ends of the cavity chain structure along the electron beam direction; a feed waveguide fixedly connected to the cavity chain structure; and a microwave input window and a titanium pump fixedly disposed on the feed waveguide.

[0015] The preferred embodiment is that the electron gun is a diode electron gun or a grid-controlled electron gun; the diameter of the injection waist of the electron beam emitted by the electron gun is less than 1.5 mm.

[0016] The preferred embodiment is that the center frequency range of the standing wave accelerator tube is 5707MHz-5717MHz.

[0017] This invention also provides an accelerator, including a power source for generating microwaves; a standing wave accelerator tube as described above; a microwave system connected between the power source and the standing wave accelerator tube; and a solid-state modulator system for providing high-voltage pulses to the power source and the electron gun.

[0018] The beneficial effects of this utility model are as follows:

[0019] This invention utilizes the cooperation of multiple focusing cavity units arranged sequentially along the electron beam direction, and designs the focusing cavity of the focusing cavity unit closest to the electron gun as an asymmetrical cavity shape along the electron beam direction. This allows for a small focal spot design in the accelerating tube while maintaining acceleration performance, thereby improving spatial resolution. Furthermore, it achieves an ultra-fine focal spot size of less than 0.5 mm, which is more than 50% smaller than the focal spot size of conventional accelerating tubes. Attached Figure Description

[0020] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the cavity chain structure of this utility model.

[0022] Figure 2 This is one of the structural schematic diagrams of the standing wave accelerator tube of this utility model.

[0023] Figure 3 This is the second schematic diagram of the standing wave accelerator tube of this utility model.

[0024] Figure 4 This is a schematic diagram of the accelerator structure of this utility model.

[0025] Figure 5 This is a target electron transverse density curve in the X direction, representing an example of this utility model.

[0026] Figure 6 This is a target electron transverse density curve in the Y direction, representing an example of this utility model.

[0027] Figure 7 This is another example of the X-direction target electron transverse density curve of this utility model.

[0028] Figure 8 This is a target electron transverse density curve in the Y direction, representing another example of this utility model.

[0029] Reference numerals: 1. Power source; 2. Standing wave accelerator tube; 3. Gas-filled straight waveguide; 4. Gas-filled bent waveguide; 5. Four-terminal circulator; 7. Solid-state modulator control unit; 8. Power source pulse unit; 9. Electron gun pulse unit; 10. Collimator unit; 11. Frame structure; 21. Cavity chain structure; 22. Electron gun; 23. Target component; 24. Feed waveguide; 25. Input window; 26. Titanium pump; 211. First focusing cavity unit; 212. Second focusing cavity. Unit 213, third focusing cavity unit, 214, coupling cavity, 215, inter-cavity coupling hole, 2111, first beam hole, 2112, second beam hole, 2122, third beam hole, 2133, fourth beam hole, 2113, first nose cone, 2114, second nose cone, 2121, third nose cone, 2131, fourth nose cone, 2132, coupling hole, 121, first focusing cavity, 122, second focusing cavity, 123, third focusing cavity. Detailed Implementation

[0030] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0031] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0032] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0033] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0035] To address the problem of limited spatial resolution caused by the large focal size of existing electron linear accelerators, this invention provides a cavity chain structure for standing-wave accelerator tubes, combined with... Figures 1 to 8 As shown, the cavity chain structure specifically includes multiple focusing cavity units arranged sequentially along the electron beam direction and a coupling cavity 214 between adjacent focusing cavity units. Each focusing cavity unit includes a focusing cavity and a beam aperture for forming an electron beam channel; the beam aperture is formed on both sides of the focusing cavity along the electron beam direction; the two ends of the beam aperture along its own axial direction are respectively connected to the focusing cavity and the coupling cavity 214; all beam apertures are coaxially arranged along the electron beam direction to form an electron beam channel, i.e., the electron beam direction is the axial direction of the electron beam channel. The focusing cavity of the focusing cavity unit near the electron gun in the cavity chain structure has an asymmetrical cavity design along the electron beam direction. The focusing cavity unit of the cavity chain structure used to cooperate with the electron gun is the first focusing cavity unit 211; the aperture of the first beam aperture 2111 of the first focusing cavity unit 211 near the electron gun is larger than the aperture of the second beam aperture 2112 away from the electron gun. The first beam aperture 2111 of the first focusing cavity unit 211, located near the electron gun, is used to cooperate with the electron gun so that electrons emitted by the electron gun can enter the focusing cavity; therefore, this first beam aperture 2111 can also be called an injection aperture. The cavity chain structure of this invention uses only multiple focusing cavity units and does not include an acceleration cavity. Through multi-stage focusing and the asymmetrical cavity design of the first focusing cavity unit, the focal spot size can ultimately be controlled to within 0.5mm, achieving a small focal spot design.

[0036] In the above embodiment, the aperture of the beam aperture near the electron gun in the first focusing cavity unit 211 is larger than the aperture of the beam aperture farther from the electron gun. More specifically, the aperture D1 of the first beam aperture 2111 ranges from 4mm ≤ D1 ≤ 5mm; the aperture D2 of the second beam aperture 2112 ranges from 3mm ≤ D2 ≤ 3.5mm. This cavity chain structure allows the focal point size of the accelerating tube to be controlled within 0.5mm. The apertures of the beam apertures in all focusing cavity units except the first focusing cavity unit 211 are equal to the aperture of the second beam aperture 2112 of the first focusing cavity unit 211, which is farther from the electron gun; that is, the apertures of the third beam aperture 2122 and the fourth beam aperture 2133 are both equal to the aperture of the second beam aperture 2112. The number of focusing cavity units is n, where 3 ≤ n ≤ 5. With the above configuration, the injection aperture of the first focusing cavity unit 211 is larger than the second beam aperture. This avoids the rapid decrease in the lateral size of the beam cluster due to excessive focusing within the first focusing cavity unit 211, which would lead to a sharp increase in space charge force and thus help suppress the space charge effect. Furthermore, by designing the aperture D1 of the first beam aperture 2111 of the first focusing cavity unit 211 to be 4mm≤D1≤5mm and the aperture D2 of the second beam aperture of the first focusing cavity unit 211 to be 3mm≤D2≤3.5mm, an ultra-fine focal point size of less than 0.5mm can be achieved in the accelerating tube, which is more than 50% smaller than the focal point size of conventional accelerating tubes.

[0037] In one specific embodiment, to ensure that the phase velocity of the first focusing cavity unit 211 is less than the phase velocity of the subsequently connected focusing cavity units, the length of the first focusing cavity 121 of the first focusing cavity unit 211 along the electron beam direction is smaller than the length of the focusing cavity of the adjacent focusing cavity unit along the electron beam direction; the lengths of the focusing cavities of the focusing cavity units other than the first focusing cavity unit 211 along the electron beam direction are all the same. More specifically, with Figure 1 Taking the three focusing cavity units in the image as an example, from left to right, they are the first focusing cavity unit 211, the second focusing cavity unit 212, and the third focusing cavity unit 213. The length of the first focusing cavity 121 of the first focusing cavity unit 211 along the electron beam direction is smaller than the length of the second focusing cavity 122 of the second focusing cavity unit 212 along the electron beam direction. The length of the second focusing cavity 122 of the second focusing cavity unit 212 along the electron beam direction is equal to the length of the third focusing cavity 123 of the third focusing cavity unit 213 along the electron beam direction. For ease of assembly, the external dimensions of the third focusing cavity unit 213 are larger than those of the first focusing cavity unit 211 and the second focusing cavity unit 212.

[0038] In one specific embodiment, the focusing cavity unit further includes two protruding structures formed on the two opposite cavity sidewalls of the focusing cavity, extending into the focusing cavity along the electron beam direction; beam apertures on both sides of the same focusing cavity unit pass through the two protruding structures respectively; the size of the protruding structure near the electron gun in the first focusing cavity unit 211 is larger than the size of the protruding structure away from the electron gun to match and form an injection aperture with a larger diameter. Specifically, the radial dimension of the protruding structure near the electron gun in the first focusing cavity unit 211 is larger than the radial dimension of the protruding structure away from the electron gun. The aforementioned radial dimension is the size of the protruding structure perpendicular to the electron beam direction. The two protruding structures in the focusing cavity units starting from the second focusing cavity unit 212 are symmetrically arranged. That is, the two protruding structures in the second focusing cavity unit 212 and the third focusing cavity unit 213, excluding the first focusing cavity unit 211, are symmetrically arranged, and their sizes and shapes are completely identical. Through the above arrangement, the increase in beam emissivity caused by the nonlinear components of the radial electric field and the amplitude of higher harmonic waves can be reduced. The protrusion near the electron gun in the first focusing cavity unit 211 is larger than the protrusion away from the electron gun, allowing for an asymmetrical cavity design within the unit. Combined with a multi-stage focusing method, this enables the focal spot size to be controlled to within 0.5mm, achieving a small focal spot design. It is understood that all focusing cavity units are cylindrical structures. The two opposing cavity sidewalls mentioned above refer to the two end face sidewalls of the focusing cavity unit along the electron beam direction, connected by a circumferential sidewall. The beam aperture and protrusion structure are coaxially arranged with the focusing cavity end face. Further combining... Figure 1 As shown, within the first focusing cavity unit 211, the protruding structure on the left is the first nose cone 2113, and the protruding structure on the right is the second nose cone 2114. The size of the first nose cone 2113 is larger than that of the second nose cone 2114. The protruding structure within the second focusing cavity 122 is the third nose cone 2121, and the protruding structure within the third focusing cavity 123 is the fourth nose cone 2131. The third nose cone 2121 and the fourth nose cone 2131 have the same shape and size. The size of the second nose cone 2114 is smaller than that of the third nose cone 2121, and the size of the third nose cone 2121 is smaller than that of the first nose cone 2113. It should be noted that, for ease of processing, arc-shaped transitions are formed at the corner connections between the protruding structures and the inner wall of the focusing cavity, and at the corner connections between the protruding structures and the focusing aperture.

[0039] In one specific embodiment, the peripheral sidewall of the last focusing cavity unit, furthest from the first focusing cavity unit 211, is formed with a coupling hole 2132 communicating with its own focusing cavity. This coupling hole 2132 is used to cooperate with an external energy transmission structure to achieve communication between the energy transmission structure and the focusing cavity. Specifically, the rightmost third focusing cavity unit 213 is provided with a coupling hole 2132, which communicates with the third focusing cavity 123 and precisely aligns with the external energy transmission structure, thereby establishing an efficient energy transmission channel. Furthermore, the focusing cavity unit also includes an inter-cavity coupling hole 215, through which the focusing cavity communicates with the coupling cavity 214. It can be understood that the inter-cavity coupling holes 215 on adjacent focusing cavity units are arranged in a cross-shaped orthogonal pattern. Figure 1 In the view, only the intercavity coupling hole 215 on the second focusing cavity unit 212 can be shown.

[0040] This utility model also provides a standing wave accelerator tube, including the cavity chain structure 21 as described above; an electron gun 22 and a target component 23 respectively sealed and fixed at both ends of the cavity chain structure 21 along the electron beam direction; a feed waveguide 24 fixedly connected to the peripheral sidewall of the cavity chain structure 21; and a microwave input window 25 and a titanium pump 26 fixedly disposed on the feed waveguide 24.

[0041] Furthermore, the electron gun 22 is used to emit an electron beam into the cavity chain structure 21. The electron gun 22 is a diode electron gun or a grid-controlled electron gun. The diameter of the beam waist emitted by the electron gun 22 is less than 1.5 mm. The center frequency range of the standing wave accelerator tube is 5707 MHz-5717 MHz. The target component 23 is a heavy metal target. Electrons bombard the heavy metal target at the end of the accelerator tube, generating bremsstrahlung radiation and producing X-rays. A cooling water channel is provided inside the target component 23, and the circulating cooling water in the channel can cool the target component during operation. A cooling water jacket or water pipe structure is provided on the outside of the cavity chain structure 21 to fully cool the cavity chain structure 21. The feed waveguide 24 is a rectangular waveguide, and its output end is welded and fixed to the peripheral sidewall of the cavity chain structure 21 and connected to the coupling hole 2132. The cavity chain structure 21 is coupled to the feed waveguide 24 through the coupling hole 2132. During cavity chain tuning, the size of the coupling hole 2132 between the feed waveguide 24 and the cavity chain structure 21 can be adjusted to ensure optimal coupling of the standing wave accelerator tube. The aforementioned titanium pump 26 uses heating and ionization to cause titanium atoms to chemically react with space gas molecules, depositing the gas and thus reducing the concentration of space gas molecules to achieve a vacuum.

[0042] Specifically, in the small-focus standing-wave accelerator tube provided by this utility model, its cavity chain structure 21 is a dual-period axially coupled accelerator cavity chain structure composed of three focusing cavity unit structures with an injection aperture of 4mm-5mm and a beam aperture of 3mm-3.5mm. By adopting a cavity chain structure with injection aperture and beam aperture within the above-mentioned size range, its focal spot size can be less than 0.5mm, which is more than 50% smaller than that of conventional accelerator tubes, thus realizing the small-focus design of the accelerator tube.

[0043] The following provides the specific structural dimensions of an example of this utility model. The number of focusing cavity units is n=3. The length ratio of the first, second, and third focusing cavities along the beam direction is 0.84:1:1, D1=4.5mm, and D2=3.5mm. When the electron gun waist diameter is 1mm, the lateral density fitting curves of the target electrons in the X and Y directions are as follows. Figure 5 and Figure 6 As shown. By reading the fitted curve, the FWHM in the X direction is 0.39 mm, the FWHM in the Y direction is 0.40 mm, and the beam spot diameter is 0.40 mm. The focal spot size is less than 0.5 mm.

[0044] The following provides the specific structural dimensions of another embodiment of this utility model. The number of focusing cavity units is n=3. The length ratio of the first, second, and third focusing cavities along the beam direction is 0.84:1:1, D1=4mm, and D2=3mm. When the electron gun waist diameter is 0.6mm, the lateral density fitting curves of the target electrons in the X and Y directions are as follows. Figure 7 and Figure 8 As shown. By reading the fitted curve, the FWHM in the X direction is 0.17 mm, the FWHM in the Y direction is 0.15 mm, and the beam spot diameter is 0.17 mm. The focal spot size is less than 0.5 mm.

[0045] This invention also provides an accelerator, comprising a power source 1 for generating microwaves; a standing-wave accelerator tube 2 as described above for accelerating electrons; a microwave system connected between the power source 1 and the standing-wave accelerator tube 2, the microwave system feeding the microwaves generated by the power source 1 into the standing-wave accelerator tube 2; and a solid-state modulator system for providing high-voltage pulses to the power source 1 and the electron gun, the solid-state modulator system converting the obtained DC high voltage into high-voltage pulses to power the power source and the electron gun. The standing-wave accelerator tube 2 is a small-focus accelerator tube with a focal size less than 0.5 mm. The microwave system includes a waveguide and a four-terminal circulator 5, the waveguide for transmitting microwave power, and the four-terminal circulator 5 for isolating microwave power fed back to the power source 1. The waveguide includes an inflatable straight waveguide 3 and an inflatable bent waveguide 4, the inflatable straight waveguide 3 connecting the power source 1 and the four-terminal circulator 5, and the inflatable bent waveguide 4 connecting the four-terminal circulator 5 and the standing-wave accelerator tube 2. The solid-state modulator system includes a solid-state modulator control unit 7, a power source pulse unit 8, and an electron gun pulse unit 9. The solid-state modulator system converts the input DC high voltage into a pulsed high voltage. It is connected to the power source 1 and the electron gun of the standing-wave accelerator tube 2. The power source 1 receives the pulsed high voltage to generate microwaves, and the electron gun of the standing-wave accelerator tube 2 receives the pulsed high voltage to generate electrons. The accelerator also includes a collimator unit 10, which is located at the rear end of the standing-wave accelerator tube 2 in the installed state. The accelerator also includes a frame structure 11, in which the power source 1, microwave system, standing-wave accelerator tube 2, and collimator unit 10 are all disposed within the frame structure 11 and distributed along its length. The power source pulse unit 8 and electron gun pulse unit 9 are both disposed within the frame structure 11 and distributed along its width. The solid-state modulator control unit 7 is disposed outside the frame structure 11. In this small-focus accelerator, the accelerator tube is a small-focus accelerator tube with a focal size of less than 0.5 mm, which is more than 50% smaller than that of a conventional accelerator tube.

[0046] In summary, this invention, through the cooperation of multiple focusing cavity units arranged sequentially along the electron beam direction, and by designing the focusing cavity of the focusing cavity unit near the electron gun as an asymmetrical cavity shape along the electron beam direction, achieves a small focal point design for the accelerating tube while ensuring acceleration performance, thereby improving spatial resolution. Furthermore, by designing the aperture D1 of the beam aperture of the first focusing cavity unit near the electron gun to be 4mm≤D1≤5mm, and the aperture D2 of the beam aperture of the first focusing cavity unit away from the electron gun to be 3mm≤D2≤3.5mm, an ultra-fine focal point size of less than 0.5mm can be achieved, reducing the focal point size by more than 50% compared to conventional accelerating tubes.

[0047] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A cavity chain structure for a standing-wave accelerator tube, characterized in that, include Multiple focusing cavity units arranged sequentially along the direction of the electron beam; and Coupler cavity between adjacent focusing cavity units; The focusing cavity unit includes a focusing cavity and a beam aperture for forming an electron beam channel; The focusing cavity unit on the side of the cavity chain structure closest to the electron gun is the first focusing cavity unit, and the focusing cavity of the first focusing cavity unit has an asymmetric cavity design along the direction of the electron beam.

2. The cavity chain structure of claim 1, wherein, The aperture of the beam aperture near the electron gun in the first focusing cavity unit is larger than the aperture of the beam aperture away from the electron gun.

3. The cavity chain structure of claim 1, wherein, The number of focusing cavity units is n, where 3 ≤ n ≤ 5; the aperture of the beam aperture of the first focusing cavity unit near the electron gun is D1, where 4 mm ≤ D1 ≤ 5 mm; the aperture of the beam aperture of the first focusing cavity unit away from the electron gun is D2, where 3 mm ≤ D2 ≤ 3.5 mm; this cavity chain structure can control the focal size of the accelerating tube to within 0.5 mm.

4. The cavity chain structure of claim 1, wherein, Starting from the second focusing cavity unit, the aperture of the beam aperture is equal to the aperture of the beam aperture of the first focusing cavity unit that is furthest from the electron gun.

5. The cavity chain structure of claim 1, wherein, The length of the focusing cavity in the first focusing cavity unit along the electron beam direction is smaller than that of the focusing cavity in the adjacent focusing cavity unit along the electron beam direction; from the second focusing cavity unit onwards, the length of the focusing cavity along the electron beam direction is the same.

6. The cavity chain structure of claim 1, wherein, The focusing cavity unit further includes two protruding structures formed on the two opposite cavity sidewalls of the focusing cavity and extending into the focusing cavity along the direction of the electron beam; the beam aperture passes through the protruding structures; the radial dimension of the protruding structure near the electron gun in the first focusing cavity unit is larger than the radial dimension of the protruding structure away from the electron gun; the two protruding structures in the focusing cavity units starting from the second focusing cavity unit are symmetrically arranged.

7. A standing wave accelerator tube characterized by, It includes the cavity chain structure as described in any one of claims 1-6; an electron gun and a target component respectively sealed and fixed at both ends of the cavity chain structure along the electron beam direction; a feed waveguide fixedly connected to the cavity chain structure; and a microwave input window and a titanium pump fixedly disposed on the feed waveguide.

8. The standing wave accelerator of claim 7, wherein, The electron gun is a diode electron gun or a grid-controlled electron gun; the diameter of the electron beam emitted by the electron gun is less than 1.5 mm.

9. The standing wave accelerating tube according to claim 7, characterized in that, The center frequency range of the standing wave accelerator tube is 5707MHz-5717MHz.

10. An accelerator characterized by, It includes a power source for generating microwaves; a standing wave accelerator tube as claimed in claim 7; a microwave system connected between the power source and the standing wave accelerator tube; and a solid-state modulator system for providing high-voltage pulses to the power source and the electron gun.

Images