中国散裂中子源加速器束流引出调试和束损优化

黄明阳; 许守彦; 齐欣; 王生

doi:10.11884/HPLPB202335.230110

中国散裂中子源加速器束流引出调试和束损优化

doi: 10.11884/HPLPB202335.230110

黄明阳^{1, 2, 3, 4,},
许守彦^{1, 2},
齐欣^{1, 2},
王生^{1, 2, 3, 4}

1.
中国科学院高能物理研究所，北京 100049
2.
散裂中子源科学中心，广东东莞 523803
3.
中国科学院大学，北京 100049
4.
中国科学院粒子加速物理与技术重点实验室，北京 100049

基金项目: 国家自然科学基金项目(12075134)；广东省基础与应用基础研究基金项目（2021B1515120021）

详细信息

作者简介:
黄明阳，huangmy@ihep.ac.cn

中图分类号: O572.21⁺1
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- 被引次数: 0
出版历程
- 收稿日期: 2023-04-30
- 修回日期: 2023-10-29
- 录用日期: 2023-10-29
- 网络出版日期: 2023-11-04
- 刊出日期: 2023-12-15

Beam extraction commissioning and extraction beam loss optimization for China Spallation Neutron Source accelerator

Huang Mingyang^{1, 2, 3, 4
,},
Xu Shouyan^{1, 2},
Qi Xin^{1, 2},
Wang Sheng^{1, 2, 3, 4}

1.
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
2.
Spallation Neutron Source Science Center, Dongguan 523808, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China
4.
Key Laboratory of Particle Acceleration Physics & Technology, Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 引出系统是中国散裂中子源快循环同步加速器的核心组成部分，对束流精确打靶和加速器稳定运行具有重要意义。首先，详细介绍了快循环同步加速器的引出系统和束流引出方案，重点介绍了一些引出系统相关的关键技术。其次，对引出束流调试进行深入研究，包括纵向束流调试、横向束流调试、引出束流分布优化等，其中纵向束流调试主要针对8个引出Kicker定时进行精确标定，横向束流调试主要指Lambertson型磁铁、8个Kicker磁铁、高能输运线模式的匹配设置。最后，对引出束流束损进行深入研究和针对性优化，探索引出束流损失的各种来源，对Lambertson型磁铁漏场、引出束团长度、Kicker波形平顶、Kicker波形变化进行深入研究并对一些新的测量方法进行详细论述。同时，对Lambertson型磁铁入口产生超大辐射热点的现象进行深入研究，寻找其产生大量束流损失的根源，并提出最终解决方案，降低引出束流损失和辐射剂量，使其满足加速器运行要求。
- 散裂中子源 /
- 束流引出 /
- 束流调试 /
- 束流损失 /
- 辐射剂量
Abstract: The extraction system is the core component of the Rapid Cycling Synchrotron (RCS) of the China Spallation Neutron Source (CSNS). It is very important for beam striking the target accurately and stable operation of the accelerator. In this paper, firstly, the extraction system and beam extraction scheme of the RCS are introduced in detail, with emphasis on some key technologies. Secondly, the extraction beam commissioning is studied in depth, including longitudinal beam commissioning, transverse beam commissioning, and extraction beam distribution optimization. The longitudinal beam commissioning mainly refers to the accurate calibration of 8 Kickers^' timing. The transverse beam commissioning mainly refers to the matching settings between the Lambertson magnet, 8 Kicker magnets and the beam transport line mode from the RCS to the target. Finally, the extraction beam loss is studied and optimized in-depth. Various sources of the extraction beam loss are explored. The leakage field of the Lambertson magnet, extraction bunch length, flat top of kicker waveform, kicker waveform variation, and so on, are studied in depth. Some new measurement methods are also discussed in detail. At the same time, the phenomenon of super-large radiation hot spot generated at the entrance of Lambertson magnet is studied in depth to find out the source of the large beam loss and put forward the final solution to reduce the extraction beam loss and radiation dose, and then make it meet the requirements of the accelerator operation.
- spallation neutron source /
- beam extraction /
- beam commissioning /
- beam loss /
- radiation dose

HTML全文

图 1 CSNS引出系统示意图

Figure 1. Layout of the CSNS extraction system

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图 2 引出定时控制系统

Figure 2. Control system of the extraction timing

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图 3 定时标定后8个Kicker的电流曲线

Figure 3. Current curves of 8 Kickers after the timing calibration

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图 4 束流引出过程示意图

Figure 4. Layout of the beam extraction process

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图 5 注入束团的时间结构

Figure 5. Time structure of the injection beam

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图 6 靶上束流分布图

Figure 6. Beam distribution on the target

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图 7 Lambertson型磁铁漏场测量结果

Figure 7. Measurement results of the leakage field for the Lambertson magnet

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图 8 Lambertson型磁铁漏场束流测量结果

Figure 8. Beam measurement results of the leakage field for the Lambertson magnet

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图 9 打靶束流功率为140 kW时实际引出束团长度测量结果

Figure 9. Measurement results of actual bunch length when the beam power on the target is 140 kW

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图 10 8个Kicker波形测量结果

Figure 10. Measurement results of 8 Kicker waveforms

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图 11 Kicker波形变化示意图

Figure 11. Variation diagrams of Kicker waveform

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图 12 Lambertson型磁铁入口大剂量率热点

Figure 12. Large dose rate hotspot at the Lambertson magnet entrance

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图 13 中子探测器(R3MB03INBLM)测量值随准直器垂直接收度变化而变化

Figure 13. Neutron detector (R3MB03INBLM) measurement results varying with the collimator vertical acceptance

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参考文献(15)

[1]	Wang Sheng, Fang Shouxian, Fu Shinian, et al. Introduction to the overall physics design of CSNS accelerators[J]. Chinese Physics C, 2009, 33(s2): 1-3. doi: 10.1088/1674-1137/33/S2/001
[2]	陈和生, 马力, 陈元柏, 等. 散裂中子源初步设计报告[R]. 中国科学院, 2016 Chen Hesheng, Ma Li, Chen Yuanbai, et al. Preliminary design report for the China Spallation Neutron Source[R]. Chinese Academy of Sciences, 2016
[3]	Wei Jie, Fu Shinian, Tang Jingyu, et al. China Spallation Neutron Source- an overview of application prospects[J]. Chinese Physics C, 2009, 33(11): 1033-1042. doi: 10.1088/1674-1137/33/11/021
[4]	Huang Mingyang, Wang Sheng, Qiu Jing, et al. Effects of injection beam parameters and foil scattering for CSNS/RCS[J]. Chinese Physics C, 2013, 37: 067001. doi: 10.1088/1674-1137/37/6/067001
[5]	Wu Yuwen, Kang Wen, Chen Yuan, et al. Development of the CSNS Lambertson magnet with very low stray field[J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2018, 882: 45-52.
[6]	Huang Mingyang, Jin Dapeng, Shen Li, et al. Timing adjustment of eight kickers and a method to calibrate the kicker current curves during the beam commissioning for CSNS[C]//Proceedings of the 61st ICFA ABDW on High-Intensity and High-Brightness Hadron Beams (HB2018). 2018: 312-314.
[7]	Xu Shouyan, Liu Hanyang, Peng Jun, et al. Beam commissioning and beam loss control for CSNS accelerators[J]. Journal of Instrumentation, 2020, 15: P07023. doi: 10.1088/1748-0221/15/07/P07023
[8]	黄良生, 刘汉阳, 李明涛, 等. 中国散裂中子源快循环同步加速器束团长度研究[J]. 原子能科学技术, 2022, 56(7):1456-1464 Huang Liangsheng, Liu Hanyang, Li Mingtao, et al. Bunch length study in rapid cycling synchrotron of China Spallation Neutron Source[J]. Atomic Energy Science and Technology, 2022, 56(7): 1456-1464
[9]	Fung K M, Ball M, Chu C M, et al. Bunch length compression manipulations[J]. Physical Review Special Topics-Accelerators and Beams, 2000, 3: 100101. doi: 10.1103/PhysRevSTAB.3.100101
[10]	Zou Ye, Tang Jingyu, Chen Jinfang, et al. Short-bunch extraction in a rapid cycling synchrotron[J]. Physical Review Special Topics-Accelerators and Beams, 2014, 17: 060101. doi: 10.1103/PhysRevSTAB.17.060101
[11]	Kamiya J, Takayanagi T, Watanabe M. Performance of extraction kicker magnet in a rapid cycling synchrotron[J]. Physical Review Special Topics-Accelerators and Beams, 2009, 12: 072401. doi: 10.1103/PhysRevSTAB.12.072401
[12]	Harada H, Saha P K, Tamura F, et al. Beam-based compensation of extracted-beam displacement caused by field ringing of pulsed kicker magnets in the 3 GeV rapid cycling synchrotron of the Japan Proton Accelerator Research Complex[J]. Progress of Theoretical and Experimental Physics, 2017, 2017: 093G01.
[13]	Carwardine J A, Wang J. Analysis of the electrical noise from the APS kicker magnet power supplies[C]//Proceedings of Particle Accelerator Conference. 1996: 1242-1244.
[14]	李海波, 齐欣, 张文庆, 等. CSNS的kicker电源闸流管触发特性分析[J]. 强激光与粒子束, 2021, 33:105003 doi: 10.11884/HPLPB202133.210170 Li Haibo, Qi Xin, Zhang Wenqing, et al. Thyratron trigger characteristics analysis of CSNS kicker power supply[J]. High Power Laser and Particle Beams, 2021, 33: 105003 doi: 10.11884/HPLPB202133.210170
[15]	翟军, 沈莉, 李海波, 等. CSNS/RCS引出脉冲电源传输电缆终端绝缘技术[J]. 强激光与粒子束, 2017, 29:075104 doi: 10.11884/HPLPB201729.160489 Zhai Jun, Shen Li, Li Haibo, et al. Insulation technology of transmission cable terminal for CSNS/RCS extraction pulsed power supply system[J]. High Power Laser and Particle Beams, 2017, 29: 075104 doi: 10.11884/HPLPB201729.160489