S波段6 MeV紧凑型电子回旋加速器仿真设计与模拟研究

董自强; 裴士伦; 张通; 邵琢瑕; 王琳; 陆亚林

doi:10.11884/HPLPB202537.240343

S波段6 MeV紧凑型电子回旋加速器仿真设计与模拟研究

doi: 10.11884/HPLPB202537.240343

董自强^{1, 3,},
裴士伦⁴,
张通^{1, 3},
邵琢瑕^{1, 3, ,},
王琳²,
陆亚林^{1, 3}

1.
中国科学技术大学合肥微尺度物质科学国家研究中心，合肥 230026
2.
中国科学技术大学国家同步辐射实验室，合肥 230026
3.
中国科学技术大学先进光子科学技术安徽省实验室，合肥 230026
4.
中国原子能科学研究院，北京 102413

基金项目: 中国科学院科研仪器设备研制项目(ZDZBGCH2021001)

详细信息

作者简介:
董自强，dzq1992@ustc.edu.cn

通讯作者:
邵琢瑕，std@ustc.edu.cn。

中图分类号: TN248.6
计量
- 文章访问数: 120
- HTML全文浏览量: 40
- PDF下载量: 17
- 被引次数: 0
出版历程
- 收稿日期: 2024-09-25
- 修回日期: 2025-02-15
- 录用日期: 2025-02-15
- 网络出版日期: 2025-03-27
- 刊出日期: 2025-04-15

Simulation design of an S-band 6 MeV compact microtron

Dong Ziqiang^{1, 3
,},
Pei Shilun⁴,
Zhang Tong^{1, 3},
Shao Zhuoxia^{1, 3
, ,},
Wang Lin²,
Lu Yalin^{1, 3}

1.
Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China
2.
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, China
3.
Anhui Laboratory of Advanced Photon Science and Technology, University of Science and Technology of China, Hefei 230026, China
4.
China Institute of Atomic Energy, Beijing 102413, China

摘要

摘要: 安徽省先进光子源实验室正在研制一台S波段6 MeV紧凑型电子回旋加速器，可以用于驱动紧凑型微焦点X射线源或用于驱动紧凑型太赫兹自由电子激光。为了得到更紧凑的加速器设计，利用CST电磁工作室对电子回旋加速器二型谐振腔进行了设计与计算，谐振腔工作频率为2998.2 MHz，在谐振腔间隙可获得1 MV以上的加速电压，使电子单圈能量增益可达0.9 MeV左右。同时，利用CST粒子工作室对内嵌式热阴极谐振腔的电子产生与加速过程进行了仿真计算，研究了微波功率幅度、磁场强度、热阴极发射位置、束流通道对电子回旋加速器的影响，完成了考虑束流负载情况下的耦合器设计，得到了稳态运行时的谐振腔工作参数。仿真结果表明，束流负载到达稳态时，在热阴极发射能力为20 A/cm²的情况下，可引出流强为 24 mA，束流能量为6.02 MeV，能散约为0.64%，束流横向均方根尺寸为3.3 mm×1.8 mm。
- 电子回旋加速器 /
- 谐振腔 /
- 束流仿真 /
- 束流负载效应 /
- 耦合度
Abstract: The Anhui Laboratory of Advanced Photon Science and Technology has beer developing a 6 MeV compact microtron, which can be used to drive compact microfocus X-ray sources or compact terahertz free electron lasers. To achieve a more compact accelerator design, the CST Electromagnetic suite was used to design and calculate the second type RF cavity of the microtron. The frequency of the RF cavity is 2998.2 MHz, and an accelerating voltage of over 1 MV can be obtained in the RF cavity gap. The electron energy gain can reach about 0.9 MeV per pass. At the same time, CST Particle Studio was used to simulate the electron generation and acceleration process in the ultra-high frequency cavity with thermionic cathode. The effects of microwave power amplitude, magnetic field strength, cathode emission position, and beam channel on the microtron were studied. The coupler design considering beam loading was also completed, and the operating parameters of the RF cavity during steady-state operation were obtained. The simulation results show that when the beam loading reaches steady state, with a cathode emission capacity of 20 A/cm², a current of 24 mA can be induced, a beam energy of 6 MeV, an energy spread of 0.64%, and a transverse RMS size of 3.3 mm × 1.8 mm can be obtained.
- microtron /
- RF cavity /
- beam simulation /
- beam loading /
- coupling coefficient

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图 1 经典电子回旋加速器原理图

Figure 1. Schematic diagram of a microtron

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图 2 电子回旋加速器驻波腔类型

Figure 2. Different injection schemes for cavity of microtron

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图 3 S波段二型驻波腔三维模型

Figure 3. Three dimensional model of S-band cavity

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图 4 二型驻波腔内电场分布

Figure 4. Electric field distribution in type-II cavity

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图 5 二型驻波腔中心轴线上电场分布

Figure 5. Electric field distribution on the central axis of a type-II avity

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图 6 电子回旋加速器微波系统示意图

Figure 6. Schematic of the compact microtron RF system

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图 7 驻波腔主要束流通道尺寸及位置

Figure 7. Slits size of S-band cavity

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图 8 驻波腔耦合器3D模型

Figure 8. 3D model of coupler

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图 9 耦合度曲线

Figure 9. Coupling coefficient curve

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图 10 入射功率与反射功率

Figure 10. Input power and output power

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图 11 三维空间中电子束流分布

Figure 11. 3D result of electron beam dynamics in space

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图 12 引出束流能量分布

Figure 12. Energy distribution of extracted beam

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图 13 3 μs内引出束流强度随时间变化

Figure 13. Beam current vs time

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表 1 S波段驻波腔尺寸

Table 1. Size of S-band type-II cavity

radius/mm	gap/mm	cathode position/mm	supplementary/mm	entrance/mm	exit/mm
37.991	23	3	12 × 18	7.8 × 16	9.2 × 30.2

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表 2 驻波腔主要工作参数

Table 2. Parameters of type-II cavity

material	RF frequency/ MHz	gap voltage/ MV	Q₀	shunt impedance/ MΩ	average power loss (duty factor: 0.1%)/W
oxygen free copper	2998.2	1.27	11181	2.68	643

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表 3 S波段电子回旋加速器束流参数

Table 3. Beam parameters of the S-band microtron

energy/ MeV	cathode current density/(A·cm⁻²)	peak current/ mA	energy gain per turn/MeV	emittance/ (πmm·mrad)	energy spread/%	pulse frequency/Hz	pulse width/μs
6	20	24	0.9	38(H)/3.8(V)	0.64	100	10

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参考文献(15)

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