中国散裂中子源π模加速器的电磁设计和分析

Qu Peihua; Liu Huachang; Peng Jun; Wang Yun; Fan Mengxu; Li Ahong

doi:10.11884/HPLPB201830.170384

中国散裂中子源π模加速器的电磁设计和分析

doi: 10.11884/HPLPB201830.170384

瞿培华^{1, 2,},
刘华昌^{1, 2},
彭军^{1, 2},
王云^{1, 2},
樊梦旭^{1, 2},
李阿红^{1, 2}

1.
中国科学院高能物理研究所，北京 100049
2.
东莞中子科学中心，广东东莞 523803

基金项目:

National Natural Science Foundation of China 11105166

Youth Innovation Promotion Association of CAS 2015011

详细信息

中图分类号: TL53
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- 文章访问数: 1379
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- 被引次数: 0
出版历程
- 收稿日期: 2017-09-25
- 修回日期: 2017-11-15
- 刊出日期: 2018-05-15

Electromagnetic design and analysis of pi-mode structure for CSNS

Qu Peihua^{1, 2
,},
Liu Huachang^{1, 2},
Peng Jun^{1, 2},
Wang Yun^{1, 2},
Fan Mengxu^{1, 2},
Li Ahong^{1, 2}

1.
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
2.
Dongguan Neutron Science Center, Dongguan 523803, China

Funds:

National Natural Science Foundation of China 11105166

Youth Innovation Promotion Association of CAS 2015011

More Information

Author Bio:
Qu Peihua (1991—), female, master, engaged in research of radio frequency technology for accelerator; quph@ihep.ac.cn

摘要

摘要: 中国散裂中子源(CSNS)一期工程现处于调束运行阶段，未来二期工程考虑采用π模加速器将直线段能量从80 MeV升级到300 MeV，对该加速器进行了预研究。利用2D程序SUPERFISH设计出了π模加速器的单元尺寸，其中工作频率为324 MHz，β为0.4。通过3D程序CST优化了耦合系数、耦合孔的个数以及耦合孔的形状。耦合系数的设计值定为6.53%。利用尾部调谐环和7个固定调谐器将电场平整度调至2.18%，满足运行要求。
- PIMS /
- 电磁设计和分析 /
- 优化耦合系数 /
- 电场平整度调谐
Abstract: The phase one project of the China Spallation Neutron Source (CSNS) is in the stage of beam commissioning. In the future, the pi-mode structure (PIMS) will be used to upgrade the energy of linac from 80 MeV to 300 MeV. Some preliminarily study was done. The dimension of the PIMS was designed with 2D code SUPERFISH, where the operating frequency was 324 MHz and the β value was 0.4. Coupling coefficient, number of coupling slots and the shape of them were optimized by 3D code CST Microwave studio. The coupling coefficient was chosen to be 6.53%. Field flatness was tuned to 2.18% with slug tuners, which meet the operational requirements.
- pi-mode structure /
- electromagnetic design /
- coupling coefficient optimization /
- field flatness tuning

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Figure 1. Dimensions of CSNS PIMS cell

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Figure 2. 3D view of a PIMS cell

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Figure 3. Standard coupling slots

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Figure 4. Four ways of coupling slots distribution

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Figure 5. Standard and modified coupling slots

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Figure 6. Simulation results of standard and modified slot

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Figure 7. Z as function of k of three cases in Fig. 6

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Figure 8. Geometry of end cell of CSNS PIMS in 2D and 3D

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Figure 9. Fine tuning with tuners

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Figure 10. 10 Electric field along z axis of PIMS

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Table 1. Simulation results of four ways of coupling slots distribution (cell number N=2, β=0.4)

number of coupling slots	k/%	loss/kW
1	1.16	150.71
2	2.31	160.63
3	3.47	164.61
4	4.70	169.93

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Table 2. Simulation results of three sets of modified slots (N=7, β=0.4)

L₁/cm	k/%	Δv/%
9.5	5.54	7.51
10.1	6.69	7.81
10.3	7.239	23.08

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参考文献(10)

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