强流质子加速器束流剖面测量探测器设计

刘孟宇; 孙继磊; 徐智虹; 杨涛; 聂小军; 黄蔚玲; 康玲; 刘华昌; 杨仁俊

doi:10.11884/HPLPB202537.240419

强流质子加速器束流剖面测量探测器设计

doi: 10.11884/HPLPB202537.240419

刘孟宇^{1, 2, 3,},
孙继磊^{1, 2, 3},
徐智虹^{1, 3},
杨涛^{1, 3},
聂小军^{1, 3},
黄蔚玲^{1, 2, 3, ,},
康玲^{1, 2, 3},
刘华昌^{1, 2, 3},
杨仁俊^{1, 2, 3, ,}

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

基金项目: 国家自然科学基金项目(12275294)；广东省自然科学基金项目(2021A1515010269)

详细信息

作者简介:
刘孟宇，liumy@ihep.ac.cn

通讯作者:
黄蔚玲，huangwei@ihep.ac.cn

杨仁俊，yangrenjun@ihep.ac.cn。

中图分类号: TL506
计量
- 文章访问数: 150
- HTML全文浏览量: 55
- PDF下载量: 14
- 被引次数: 0
出版历程
- 收稿日期: 2024-12-10
- 修回日期: 2025-03-17
- 录用日期: 2025-03-17
- 网络出版日期: 2025-03-27
- 刊出日期: 2025-04-15

Design of detector for measuring beam profile of high-intensity proton accelerator

Liu Mengyu^{1, 2, 3
,},
Sun Jilei^{1, 2, 3},
Xu Zhihong^{1, 3},
Yang Tao^{1, 3},
Nie Xiaojun^{1, 3},
Huang Weiling^{1, 2, 3
, ,},
Kang Ling^{1, 2, 3},
Liu Huachang^{1, 2, 3},
Yang Renjun^{1, 2, 3
, ,}

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

摘要

摘要: 束流的横向剖面分布是强流质子加速器的关键性能指标之一。中国散裂中子源直线加速器新安装一台残余气体电离型束流剖面探测器（IPM），用于关键位置束流横向剖面等参数的非拦截式实时测量。介绍了该剖面探测器的选型、结构设计思路及束流实验结果。探测器采用紧凑型结构，提供了一种较小空间占用下较高分辨率的设计思路。紧凑型IPM在低压板通孔处采用匀场栅网的结构形式改善电场均匀度，减小横向电场分量及剖面测量畸变。探测器带束实验测试了其在轨道和剖面等参数测量任务中引导电场、MCP、相机等关键影响因素的性能，并与探测器位置附近的BPM所测得的束流轨道进行比对和校准。该IPM的横向剖面测量值与理论计算值对比最终误差小于8.3%，满足束流剖面的测量需求。
- 强流质子加速器 /
- 横向剖面 /
- 残余气体 /
- 束流剖面 /
- 残探测器 /
- 非拦截式
Abstract: Beam profile is one of the key performance indicators for high-intensity proton accelerators. A new residual gas ionization profile monitor has been installed at the Linac of the China Spallation Neutron Source for non-destructive, real-time measurement of parameters such as the transverse beam profile at critical locations. This paper presents the selection, structural design rationale, and beam test results of this profile monitor. The detector adopts a compact structure, offering a high-resolution design within a limited space. The compact design eliminates the equipotential strips that uniformly act on the electric field and adds a field grid at the lower plate apertures to improve the uniformity of the electric field and reduce the electric field components. Beam tests evaluated the performance of the new detector in measuring orbit and profile parameters, with calibration performed in comparison to the BPM near the detector’s location. The error between the transverse profile measurement and theoretical calculation was less than 8.3%, meeting the beam measurement requirements.
- high-intensity proton accelerator /
- transverse profile /
- residual gas /
- beam profile /
- detector /
- non-destructive

HTML全文

图 1 IPM工作原理示意图

Figure 1. Principle of Ionization profile monitor (IPM)

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图 2 CSNS布局及直线加速器IPM位置^[10]

Figure 2. CSNS layout and linac IPM location^[10]

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图 3 直线加速器IPM总体外观及电场框架

Figure 3. Overall appearance and field cage framework of IPM

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图 4 IPM LabVIEW采集程序界面

Figure 4. IPM LabVIEW acquisition program interface

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图 5 IPM下游束流损失与IPM加压关系

Figure 5. Relationship between IPM downstream beam loss and IPM

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图 6 2～8 kV引导场电势下MCP压差、束流流强与图像像素积分值（收集光子数）关系

Figure 6. Relationship between MCP pressure, beam current intensity and image pixel integral value (number of collected photons)

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图 7 束流变轨道扫描及MCP一维寿命标定

Figure 7. Local orbit bumps and one-dimensional lifetime calibration

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图 8 MCP二维MCP寿命标定结果

Figure 8. MCP two-dimensional life calibration result

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图 10 安装电磁屏蔽后IPM获取的图像及修复结果

Figure 10. Image obtained by the IPM after installing the electromagnetic shielding and the repair result

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图 9 DIP与PDE修复性能对比

Figure 9. Comparison of repair performance among PDE and DIP

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表 1 CSNS直线加速器IPM处束流参数

Table 1. Beam parameters at the IPM of CSNS linac

energy/MeV repetition rate/Hz vacuum/Pa gas type beam width/µs N

80 25 10⁻⁶～10⁻⁷ H₂, He, etc. 20～415 1.56×10¹³

下载: 导出CSV

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