CN113163569A - Method for inhibiting RFQ frequency drift - Google Patents
Method for inhibiting RFQ frequency drift Download PDFInfo
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- CN113163569A CN113163569A CN202110432165.6A CN202110432165A CN113163569A CN 113163569 A CN113163569 A CN 113163569A CN 202110432165 A CN202110432165 A CN 202110432165A CN 113163569 A CN113163569 A CN 113163569A
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
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Abstract
The invention relates to the technical field of accelerators, in particular to a method for inhibiting RFQ frequency drift through water cooling design, which can realize no frequency drift; determining the cross-sectional shape and cooling water temperature of an RFQ cavity, then determining water flow, determining the positions and sizes of a first basic hole and a second basic hole according to determined content parameters by a general design principle, and determining the positions and sizes of variable hole positions by a simulation optimization method to realize the frequency drift-free cavity; the design of no-frequency drift in the RFQ cavity can be realized by optimizing the layout of water holes on the RFQ section, more specifically, the power consumption of the RFQ cavity, the determined working temperature and the determined water flow can be determined, the positions of the first basic hole and the second basic hole can be determined, the no-frequency drift of the cavity can be realized by optimizing the positions of the variable holes, the result is accurate and reliable, and the method is simple and easy to implement.
Description
Technical Field
The invention relates to the technical field of accelerators, in particular to a method for restraining RFQ frequency drift through a water-cooling design, which can realize no frequency drift.
Background
The four-wing radio frequency quadrupole field (RFQ) accelerator is an optimal accelerating structure selected after an ion source at a low-energy accelerating section of a high-current proton accelerator, the RFQ has the advantages of integrating transverse focusing, longitudinal acceleration and bunching into a whole, the RFQ cavity is heated and deformed by radio frequency power required by particle acceleration, the resonant frequency of the cavity is changed, and the frequency drift causes the change of the distribution of a radio frequency field in the cavity; since the transmission efficiency of RFQ particles is extremely sensitive to the radio frequency field distribution, this cavity frequency drift must be suppressed.
Disclosure of Invention
In order to solve the problem that the frequency drift of a four-wing radio frequency quadrupole field (RFQ) accelerator causes the distribution change of an intra-cavity radio frequency field, the invention aims to provide a design method for realizing the suppression of the RFQ frequency drift by optimizing the water hole layout.
The technical scheme adopted by the invention is as follows: a design method for inhibiting RFQ frequency drift comprises the steps of firstly determining the cross section shape of an RFQ cavity and the cooling water temperature, then determining the water flow, then determining the positions and the sizes of a first basic hole and a second basic hole according to determined content parameters through a general design principle, and determining the positions and the sizes of variable hole positions through a simulation optimization method to realize cavity frequency drift free.
The RFQ cavity is cylindrical as a whole and circular in cross section, and four wing bodies in the RFQ cavity equally divide the RFQ cavity into four cavities in the axial direction.
The four wing bodies in the RFQ cavity are identical in shape and structure and are axially and radially symmetrical, and a cavity is formed between every two adjacent wing bodies.
The cross section of each wing body is in an axisymmetric shape, and two symmetric wing shapes are arranged on two sides of the symmetry axis.
Each wing body is provided with a first reference hole, a second reference hole and a variable hole which penetrate through the RFQ cavity along the axial direction.
The general design principle refers to that the first basic hole is designed at a position close to the center of the cross section of the RFQ cavity, and the second basic hole is designed at a position of two symmetrical wing shapes in the wing body.
The simulation optimization method is characterized in that the effect of the RFQ cavity wall deformation on the resonant frequency is opposite to the effect of the RFQ electrode deformation on the resonant frequency, and the effects of the cavity wall and the electrode deformation on the resonant frequency are mutually offset by optimizing the water hole position and the water flow of the variable hole position, so that the water cooling design without frequency drift in the cavity is realized.
A design method for inhibiting RFQ frequency drift is disclosed, which comprises the following steps: adopting ANSYY as simulation analysis software, firstly calculating the original frequency of an RFQ cavity as C1, then calculating the thermal deformation of the cavity according to the actual cavity consumption, determining the cooling water temperature and the water flow, changing the frequency of the cavity into C2, determining the positions and the shapes of a first basic hole and a second basic hole, and continuously optimizing the position of a variable hole position to ensure that C1 is C2, wherein the position of the variable hole position is an ideal position for realizing the frequency drift-free cavity.
The design method is used for the four-wing radio frequency quadrupole field accelerator.
The invention has the beneficial effects that: simulation calculation shows that the RFQ cavity body design without frequency drift can be realized by optimizing the layout of the water holes on the RFQ section, more specifically, the positions of the first basic hole and the second basic hole can be determined by determining the power consumption of the RFQ cavity body, the determined working temperature and the determined water flow, and the cavity body design without frequency drift can be realized by optimizing the positions of the variable holes, so that the result is accurate and reliable, and the method is simple and easy to implement.
Drawings
Fig. 1 is a schematic cross-sectional view of an RFQ chamber of the present invention.
FIG. 2 is a schematic cross-sectional structural view of a half airfoil body according to the present invention.
Reference is made to the accompanying drawings in which: 1-basic hole I, 2-basic hole II, 3-variable hole position, 4-RFQ cavity and 5-wing body.
Detailed Description
The following detailed description of embodiments is provided in conjunction with the drawings of the specification:
since the RFQ cavity 4 of the present invention is a regular cylinder, and the four wing bodies 5 are axially and radially symmetrical, i.e. are centrosymmetric, in the drawings of the present embodiment, the RFQ cavity 4 is only illustrated in a cross-sectional structure, specifically as shown in fig. 1, and the wing bodies 5 are only illustrated in a half wing shape, specifically as shown in fig. 2.
As shown in fig. 1-2, a design method for suppressing RFQ frequency drift is used for a four-wing rf quadrupole accelerator; firstly, determining the cross section shape and cooling water temperature of an RFQ cavity 4, then determining water flow, obtaining the water temperature to be cooled by knowing the shape and size of the cavity and the generated heat when the RFQ cavity 4 is cooled usually according to determined content parameters, then determining the water flow, and determining the positions and the sizes of a first basic hole 1 and a second basic hole 2 through a general design principle, wherein the general design principle refers to that the first basic hole 1 is designed at the position close to the center of the cross section of the RFQ cavity 4, and the second basic hole 2 is designed at the positions of two symmetrical wing shapes in a wing body 5; the position and the size of the position 3 of the variable hole are determined by a simulation optimization method, the simulation optimization method is that the effect of the wall deformation of the RFQ cavity 4 on the resonance frequency is opposite to the effect of the RFQ electrode deformation on the resonance frequency, and the effects of the deformation of the cavity wall and the electrode on the resonance frequency are mutually offset by optimizing the position of the water hole at the position 3 of the variable hole and the water flow, so that the water cooling design without frequency drift in the cavity is realized.
The RFQ cavity 4 is cylindrical as a whole and has a circular cross section, and the four wing bodies 5 in the RFQ cavity 4 equally divide the RFQ cavity 4 into four cavities in the axial direction; the four wing bodies 5 in the RFQ cavity 4 are identical in shape and structure and are axially and radially symmetrical, namely, centrosymmetric, and a cavity is formed between every two adjacent wing bodies 5, so that the four cavities are total, the section of each wing body 5 is in an axisymmetric shape, two sides of the symmetry axis are in two symmetrical wing shapes, each wing body 5 is provided with a first reference hole, a second reference hole and a variable hole 3 which penetrate through the RFQ cavity 4 in the axial direction, one reference hole is arranged, two reference holes are arranged, one variable hole 3 is arranged, the first reference hole is arranged at a position close to the center of the section, the two reference holes are respectively arranged on the two wing shapes, and the position of the variable hole 3 is determined by optimization.
A design method for inhibiting RFQ frequency drift is disclosed, which comprises the following steps: adopting ANSYSY as simulation analysis software, firstly calculating the original frequency of an RFQ cavity 4 as C1, then calculating the thermal deformation of the cavity according to the actual cavity consumption, determining the cooling water temperature and the water flow, changing the frequency of the cavity into C2, determining the positions and the shapes of a first basic hole 1 and a second basic hole 2, and continuously optimizing the position of a 3-bit variable hole to ensure that C1 is C2, wherein the position of the 3-bit variable hole is the ideal position for realizing the frequency drift-free cavity.
Simulation calculation shows that the design of no-frequency drift in the RFQ cavity 4 can be realized by optimizing the layout of the water holes on the RFQ section, more specifically, the positions of the first basic hole 1 and the second basic hole 2 can be determined by determining the power consumption of the RFQ cavity 4, the determined working temperature and the determined water flow, and the no-frequency drift of the cavity can be realized by optimizing the position of the variable hole 3, so that the result is accurate and reliable, and the method is simple and easy to implement.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, and those skilled in the art may make modifications and variations within the spirit of the present invention, and all modifications, equivalents and modifications of the above embodiments according to the technical spirit of the present invention are within the scope of the present invention.
Claims (9)
1. A design method for inhibiting RFQ frequency drift is characterized in that: the method comprises the steps of firstly determining the sectional shape and the cooling water temperature of an RFQ cavity, then determining the water flow, then determining the positions and the sizes of a first basic hole and a second basic hole according to determined content parameters through a general design principle, and determining the positions and the sizes of variable hole positions through a simulation optimization method to realize the frequency drift-free cavity.
2. The design method for suppressing RFQ frequency drift as claimed in claim 1, wherein: the RFQ cavity is cylindrical as a whole and circular in cross section, and four wing bodies in the RFQ cavity equally divide the RFQ cavity into four cavities in the axial direction.
3. The design method for suppressing RFQ frequency drift as claimed in claim 2, wherein: the four wing bodies in the RFQ cavity are identical in shape and structure and are axially and radially symmetrical, and a cavity is formed between every two adjacent wing bodies.
4. A design method for suppressing RFQ frequency drift as claimed in claim 2 or 3, wherein: the cross section of each wing body is in an axisymmetric shape, and two symmetric wing shapes are arranged on two sides of the symmetry axis.
5. The design method for suppressing RFQ frequency drift as claimed in claim 4, wherein: each wing body is provided with a first reference hole, a second reference hole and a variable hole which penetrate through the RFQ cavity along the axial direction.
6. The design method for suppressing RFQ frequency drift as claimed in claim 1 or 5, wherein: the general design principle refers to that the first basic hole is designed at a position close to the center of the cross section of the RFQ cavity, and the second basic hole is designed at a position of two symmetrical wing shapes in the wing body.
7. The design method for suppressing RFQ frequency drift as claimed in claim 1, wherein: the simulation optimization method is characterized in that the effect of the RFQ cavity wall deformation on the resonant frequency is opposite to the effect of the RFQ electrode deformation on the resonant frequency, and the effects of the cavity wall and the electrode deformation on the resonant frequency are mutually offset by optimizing the water hole position and the water flow of the variable hole position, so that the water cooling design without frequency drift in the cavity is realized.
8. The design method for suppressing RFQ frequency drift as claimed in claim 1, wherein: the design method comprises the following steps: adopting ANSYY as simulation analysis software, firstly calculating the original frequency of an RFQ cavity as C1, then calculating the thermal deformation of the cavity according to the actual cavity consumption, determining the cooling water temperature and the water flow, changing the frequency of the cavity into C2, determining the positions and the shapes of a first basic hole and a second basic hole, and continuously optimizing the position of a variable hole position to ensure that C1 is C2, wherein the position of the variable hole position is an ideal position for realizing the frequency drift-free cavity.
9. The design method for suppressing RFQ frequency drift as claimed in claim 1, wherein: the design method is used for the four-wing radio frequency quadrupole field accelerator.
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| CN202110432165.6A CN113163569A (en) | 2021-04-21 | 2021-04-21 | Method for inhibiting RFQ frequency drift |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114040561A (en) * | 2021-10-25 | 2022-02-11 | 中国科学院近代物理研究所 | Cooling system and cooling method for wing-shaped radio frequency cavity |
Citations (5)
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|---|---|---|---|---|
| US4490648A (en) * | 1982-09-29 | 1984-12-25 | The United States Of America As Represented By The United States Department Of Energy | Stabilized radio frequency quadrupole |
| JPH07111198A (en) * | 1993-08-17 | 1995-04-25 | Rikagaku Kenkyusho | Rfq linear accelerator |
| CN103068143A (en) * | 2012-12-19 | 2013-04-24 | 江苏安德信超导加速器科技有限公司 | Continuous wave radio frequency four-level accelerator water cooling system and manufacturing method thereof |
| US20130328506A1 (en) * | 2012-06-12 | 2013-12-12 | Mitsubishi Electric Corporation | Drift tube linear accelerator |
| CN104470191A (en) * | 2014-12-13 | 2015-03-25 | 中国科学院近代物理研究所 | Mixed ion acceleration device |
-
2021
- 2021-04-21 CN CN202110432165.6A patent/CN113163569A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4490648A (en) * | 1982-09-29 | 1984-12-25 | The United States Of America As Represented By The United States Department Of Energy | Stabilized radio frequency quadrupole |
| JPH07111198A (en) * | 1993-08-17 | 1995-04-25 | Rikagaku Kenkyusho | Rfq linear accelerator |
| US20130328506A1 (en) * | 2012-06-12 | 2013-12-12 | Mitsubishi Electric Corporation | Drift tube linear accelerator |
| CN103068143A (en) * | 2012-12-19 | 2013-04-24 | 江苏安德信超导加速器科技有限公司 | Continuous wave radio frequency four-level accelerator water cooling system and manufacturing method thereof |
| CN104470191A (en) * | 2014-12-13 | 2015-03-25 | 中国科学院近代物理研究所 | Mixed ion acceleration device |
Non-Patent Citations (2)
| Title |
|---|
| 彭朝华,关遐龄: "强流质子RFQ加速腔热特性分析" * |
| 欧阳华甫;姚远;: "中国散裂中子源RFQ的热分析(英文)" * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114040561A (en) * | 2021-10-25 | 2022-02-11 | 中国科学院近代物理研究所 | Cooling system and cooling method for wing-shaped radio frequency cavity |
| CN114040561B (en) * | 2021-10-25 | 2023-08-01 | 中国科学院近代物理研究所 | Cooling system and cooling method for airfoil-shaped radio frequency cavity |
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