7 MeV注入剥离膜系统设计

陈佳鑫; 郑家煦; 康玲; 王安鑫; 刘磊; 聂小军

doi:10.11884/HPLPB202032.200084

7 MeV注入剥离膜系统设计

doi: 10.11884/HPLPB202032.200084

陈佳鑫^{1, 2, 3,},
郑家煦^{1, 2},
康玲^{1, 2, ,},
王安鑫^{1, 2},
刘磊^{1, 2},
聂小军^{1, 2}

1.
中国科学院高能物理研究所东莞分部，北京 100049
2.
散裂中子源科学中心，广东东莞 523803
3.
中国科学技术大学国家同步辐射实验室，合肥 230029

基金项目: 国家自然科学基金资助项目（11375217；11805220）

详细信息

作者简介:
陈佳鑫（1986—），男，硕士，工程师，从事加速器技术研究；chenjx@ihep.ac.cn

通讯作者:
康　玲（1966—），女，学士，正高级工程师，从事加速器技术研究；kangling@ihep.ac.cn

中图分类号: TL503
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- 被引次数: 0
出版历程
- 收稿日期: 2020-04-03
- 修回日期: 2020-07-30
- 刊出日期: 2020-08-13

Design of the stripper foil system at a 7 MeV injection

Chen Jiaxin^{1, 2, 3
,},
Zheng Jiaxu^{1, 2},
Kang Ling^{1, 2
, ,},
Wang Anxin^{1, 2},
Liu Lei^{1, 2},
Nie Xiaojun^{1, 2}

1.
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
2.
Spallation Neutron Source Science Center, Dongguan 523803, China
3.
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China

摘要

摘要: 设计了一台注入能量为7 MeV的快循环同步加速器剥离膜装置，介绍了主体结构设计及高精度换膜运动结构，实现膜片精确定位及在线换膜功能。针对注入参数对膜片开展分析计算，分析了7 MeV的负氢离子束注入时相应的碳膜材料的反应截面及不同厚度的剥离效率，给出了膜片厚度的参数选择。对所设计膜片的温升和寿命进行分析，膜片的温升最高点达到755 K，远小于同类的加速器的剥离膜温度，具有更高的寿命和可靠性。
- 剥离膜 /
- 反应截面 /
- 有限元计算 /
- 膜片寿命
Abstract: A rapid cycling synchrotron (RCS) with a 7 MeV linac has been under construction. The negative hydrogen ion beam H- beam injected into RCS adopts the multi-turn charge exchange injection scheme. The stripper foil system which is able to replace detective foils and adjust foil position accurately in vacuum is needed. This paper presents a foil exchange system based on steel belt transmission for its high accuracy and stability. By calculating cross section, we can estimate the stripping efficiency according to particle kinetic energy and give appropriate foil thickness. Foil temperature rise and stress which are the main reasons leading to foil rupture are analyzed using finite element method and the lifetime model is combined with experiments to predict foil lifetime of our program. The stripping efficiency reaches 99.0% when the foil thickness is 40 nm. The maximum temperature point of the foil is 755.5 K. In conclusion, the mechanical system and foil property satisfy the project requirement.
- stripper foil /
- cross section /
- finite element calculation /
- foil lifetime

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图 1 设备整体结构

Figure 1. Mechanical structure of this system

下载: 全尺寸图片幻灯片

图 2 换膜运动结构

Figure 2. Structure for foils replacement

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图 3 剥离效率与膜片厚度的关系

Figure 3. Stripping efficiency change with foil thickness

下载: 全尺寸图片幻灯片

图 4 注入束流开始后0.4，5，10，15 ms的温度分布情况

Figure 4. Temperature distribution on the foil at 0.4, 5, 10, 15 ms of a pulse respectively

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图 5 注入中心点的温度变形情况

Figure 5. Central temperature changing process

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图 6 膜片的热应力变形情况

Figure 6. Deformation of foil caused by heat

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表 1 粒子的停止能

Table 1. Stopping energy of particles

particle stopping power/(keV·cm⁻²·mg⁻¹)

electron 3.34
proton 4.31
H⁻ ion 10.99

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参考文献(16)

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