中国散裂中子源RCS注入区H<sup>0</sup>CT测量系统研制

邱瑞阳; 黄蔚玲; 曾磊; 徐智虹; 李芳; 孟鸣; 杨涛; 王安鑫; 刘孟宇; 孙纪磊; 徐韬光

doi:10.11884/HPLPB202335.220142

中国散裂中子源RCS注入区H⁰CT测量系统研制

doi: 10.11884/HPLPB202335.220142

邱瑞阳^{1, 2,},
黄蔚玲^{1, 2, ,},
曾磊^{1, 2},
徐智虹^{1, 2},
李芳^{1, 2},
孟鸣^{1, 2},
杨涛^{1, 2},
王安鑫^{1, 2},
刘孟宇³,
孙纪磊^{1, 2},
徐韬光²

1.
散裂中子源科学中心，广东东莞 523803
2.
中国科学院高能物理研究所，北京 100049
3.
中国科学院大学，北京 100049

基金项目: 国家自然基金联合基金项目(U2032165)

详细信息

作者简介:
邱瑞阳，qiury@ihep.ac.cn

通讯作者:
黄蔚玲，huangwei@ihep.ac.cn

中图分类号: TL506
计量
- 文章访问数: 612
- HTML全文浏览量: 200
- PDF下载量: 49
- 被引次数: 0
出版历程
- 收稿日期: 2022-05-06
- 修回日期: 2022-09-13
- 录用日期: 2022-10-11
- 网络出版日期: 2022-10-17
- 刊出日期: 2023-01-14

Development of an H⁰CT measurement system at the CSNS injection region

Qiu Ruiyang^{1, 2
,},
Huang Weiling^{1, 2
, ,},
Zeng Lei^{1, 2},
Xu Zhihong^{1, 2},
Li Fang^{1, 2},
Meng Ming^{1, 2},
Yang Tao^{1, 2},
Wang Anxin^{1, 2},
Liu Mengyu³,
Sun Jilei^{1, 2},
Xu Taoguang²

1.
Spallation Neutron Source Science Center, Dongguan 523803, China
2.
Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing 100049, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 中国散裂中子源的强流质子加速器采用剥离注入的方式，碳膜将H⁻剥离两个电子后变成质子，多圈涂抹注入到快循环同步环加速中，并加速至1.6 GeV。为了精确测量剥离膜的剥离效率并研究不同厚度剥离膜的使用寿命，在I-Dump束线上新研发并安装了一套束流流强探测器（H⁰CT），用于测量未完全剥离的H⁻和H⁰（H⁻被剥离一个电子）粒子。为了测量μA级束流，H⁰CT弱流强测量系统的研制考虑了外部干扰，配合探头、线缆及电子学低噪声的抗干扰设计，将环境噪声及干扰的影响降至最低，提高信噪比，实现了μA级脉冲电流的测量。
- CSNS /
- H⁰CT /
- 脉冲流强测量 /
- μA级
Abstract: The high intensity proton accelerator of China Spallation Neutron Source adopts the method of charge exchange injection. A carbon foil strips two electrons of H⁻ into H⁺, and proton beams are multiturn-painted in the phase space of the rapid cycling synchrontron for acceleration to 1.6 GeV. A new-developed beam current transformer (H⁰CT) was installed at the I-Dump beamline to measure the incompletely stripped H⁻ and H⁰ particles, for the sake of an accurate measurement of the stripping efficiency, together with a study of the service life of the foil stripper with different thicknesses. To measure such extremely weak microampere beam current, in the development of the H⁰CT measurement system, we took into account the external interference and the noises from probes, cables and electronics. The new design has minimized the impact of environmental noise, improved the signal-to-noise ratio, and successfully measured the microampere pulsed current.
- CSNS /
- H⁰CT /
- pulsed current measurement /
- microampere

HTML全文

图 1 CSNS注入区布局图^[11]

Figure 1. Layout of CSNS injection region^[11]

下载: 全尺寸图片幻灯片

图 2 外置磁环测量环境噪声干扰

Figure 2. External core to measure environmental noise

下载: 全尺寸图片幻灯片

图 3 电子学输出的干扰信号

Figure 3. Interference signal output by the electronics

下载: 全尺寸图片幻灯片

图 4 H⁰CT电流互感器及磁屏蔽结构图^[12]

Figure 4. H⁰CT sensors and magnetic shieldings^[12]

下载: 全尺寸图片幻灯片

图 5 电子学框图

Figure 5. Electronics block diagram

下载: 全尺寸图片幻灯片

图 6 10 μA校准输入时的电子学输出

Figure 6. The electronics output with 10 μA calibrated input

下载: 全尺寸图片幻灯片

图 7 H⁰CT-BCT及电子学标定数据

Figure 7. H⁰CT-BCT electronics calibration data

下载: 全尺寸图片幻灯片

图 8 最小噪声的三同轴线缆接地示意图

Figure 8. Minimal noise triax cable grounding diagram

下载: 全尺寸图片幻灯片

图 9 不同接地方式电子学输出图

Figure 9. Electrical output diagram for different grounding modes

下载: 全尺寸图片幻灯片

图 10 不同流强H⁻束流注入时H⁰CT测量结果

Figure 10. H⁰ measured by H⁰CT at different H⁻ beam current

下载: 全尺寸图片幻灯片

图 11 H₀CT及荧光靶对比图

Figure 11. Comparison chart of H₀CT and fluorescent target

下载: 全尺寸图片幻灯片

表 1 采取剥离注入模式的国际同类加速器剥离方式和束流参数对比

Table 1. Comparison of stripping methods and beam parameters of similar accelerators in the world

facility	pulse width	beam intensity/mA	beam instruments	stripping method	stripping efficiency
ISIS-RCS^[3]	200 - 250 µs	40	BCT	1. Al₂O₃ Foil 2. diamond like carbon foil (DLC)	98%±1%(estimated) 99% (simulated)
CERN-PSB^[4-5]	400 µs(1.2 ms)	40/20	BCT BCT⁺H⁰/H⁻ monitor	1. graphite foil 2. carbon based foil	99%
SNS^[6-8]	1 ms	38	BCM(FCT)	1. diamond foil 2. laser assisted Lorentz stripping	99%(maximum)
J-PARC^[9]	600 µs	50	BCT+preamplifier	1. carbon foil 2. hybrid-type boron doped carbon foil	99.7%

下载: 导出CSV

表 2 H⁰CT技术参数

Table 2. Optimized electronics parameters

frequency/Hz	macro pulse width/μs	turns of torus/ turn	droop/(%/ms)	risetime/μs	measuring range/μA
25	50 – 500	50	＜ 1	＜ 10	±50

下载: 导出CSV

表 3 线缆噪声测量

Table 3. Cable noise measurement

cable	triax	cable quad
CT-output (single-end earthed)/mV	206	286
CT-output (double-end earthed)/mV	54	166

下载: 导出CSV

参考文献(16)

[1]	Wang Sheng, An Yuwen, Fang Shouxian, et al. An overview of design for CSNS/RCS and beam transport[J]. Science China Physics, Mechanics and Astronomy, 2011, 54(s2): 239-244. doi: 10.1007/s11433-011-4564-x
[2]	Xu S Y, Huang L S, Huang M Y, et al. Beam commissioning experience of CSNS/RCS[C]//Proceedings of 10th International Particle Accelerator Conference. 2019: 1012-1014.
[3]	Jones B, Adams D J, Hughes M C, et al. Injection and stripping foil studies for a 180 MeV injection upgrade at ISIS[C]//Proceedings of HB2012. 2012: 456-460.
[4]	Bracco C, Burger S, Forte V, et al. Commissioning of the stripping foil units for the upgrade of the PSB H⁻ injection system[C]//Proceedings of IPAC2017. 2017: 595-598.
[5]	Roncarolo F, Allica Santamaria J C, Bozzolan M, et al. Beam instrumentation for the CERN LINAC4 and PSB half sector test[C]//Proceedings of IPAC2017. 2017: 408-411.
[6]	Shaw R W, Plum M A, Wilson L L, et al. Spallation Neutron Source (SNS) diamond stripper foil development[C]//Proceedings of 2007 IEEE Particle Accelerator Conference (PAC). 2007.
[7]	Danilov V, Aleksandrov A, Assadi S, et al. Proof-of-principle demonstration of high efficiency laser-assisted H⁻ beam conversion to protons[J]. Physical Review Special Topics - Accelerators and Beams, 2007, 10: 053501. doi: 10.1103/PhysRevSTAB.10.053501
[8]	Liu Y, Rakhman A, Menshov A, et al. Laser system design and operation for SNS H⁻ beam laser stripping[C]//Proceedings of IPAC2017. 2017: 57-59.
[9]	Saha P K, Hatakeyama S, Yamamoto K, et al. State of the art online monitoring system for the waste beam in the rapid cycling synchrotron of the Japan Proton Accelerator Research Complex[J]. Physical Review Special Topics - Accelerators and Beams, 2011, 14: 072801. doi: 10.1103/PhysRevSTAB.14.072801
[10]	Chen J X, Kang L, Yu J B, et al. Research of the Chinese Spallation Neutron Source stripper foil[C]//Proceedings of IPAC2017. 2017: 4562-4564.
[11]	Huang W L, Qiu R Y, Li F, et al. A dual functional current monitor for stripping efficiency measurement in CSNS[C]//8th International Beam Instrumentation Conference. Malmö, Sweden: IBIC, 2019: 96-99.
[12]	沈莉, 池云龙, 黄川, 等. CSNS RCS注入涂抹凸轨磁铁脉冲电源设计[J]. 中国物理C, 2008, 32(s1):22-24 Shen Li, Chi Yunlong, Huang Chuan, et al. Design of injection painting bumper magnets pulse power supply for CSNS/RCS[J]. Chinese Physics C, 2008, 32(s1): 22-24
[13]	曾磊, 田建民, 邱瑞阳, 等. CSNS束流损失测量系统设计[J]. 强激光与粒子束, 2019, 31:015102 doi: 10.11884/HPLPB201931.180198 Zeng Lei, Tian Jianmin, Qiu Ruiyang, et al. Design of the CSNS beam loss monitor system[J]. High Power Laser and Particle Beams, 2019, 31: 015102 doi: 10.11884/HPLPB201931.180198
[14]	Huang M Y, Wang S, Xu S Y. Beam loss and the stripping efficiency measurement for CSNS injection system[C]//Proceedings of the 10th International Particle Accelerator Conference (IPAC'19). 2019: 2329-2331.
[15]	高峰, 张合. 弹体磁屏蔽效能的计算与仿真[J]. 计量学报, 2010, 31(2):141-144 doi: 10.3969/j.issn.1000-1158.2010.02.11 Gao Feng, Zhang He. Calculation and simulation of geomagnetic field shielding effectiveness of projectile body[J]. Acta Metrologica Sinica, 2010, 31(2): 141-144 doi: 10.3969/j.issn.1000-1158.2010.02.11
[16]	Zhou Qi, Wang Zhigang. A DC-servo baseline restorer and its implementation in biomedical instrumentation[C]//Proceedings of SPIE. 2006.