Beam commissioning and beam loss control for CSNS accelerators
Beam commissioning and beam loss control for CSNS accelerators
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DOI：
10.1088/1748-0221/15/07/p07023
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发表时间：
2020-07
影响因子：
1.3
通讯作者：
S. Xu;H. Liu;J. Peng;J. Chen;L. Huang;M. Huang;M. Li;X. Lu;X. Luo;Y. Li;Y. An
中科院分区：
文献类型：
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作者：
S. Xu;H. Liu;J. Peng;J. Chen;L. Huang;M. Huang;M. Li;X. Lu;X. Luo;Y. Li;Y. An
中国空间中子源（CSNS）加速器由一个80 MeV的H−直线加速器和一个1.6 GeV的质子快速循环同步加速器（RCS）组成，后者以25 Hz的重复频率向靶提供1.6 GeV的质子束。CSNS加速器的束流调试自2017年4月开始，至2020年2月底，CSNS达到100 kW的设计束流功率。强流束流调试中最重要的问题是束流损失的控制，以及感生活度的控制，以满足人工维护的要求。为了减少不可控的束流损失，进行了一系列的束流损失优化工作。在MEBT中进行了横向和纵向匹配。在RCS调试中，进行了轨道和晶格校正、射频频率与偶极子场的匹配、注入束的调谐等。为了抑制空间电荷和集体不稳定性对束流损失的影响，人们做了很多努力，如注入优化、纵向束流动力学优化、调谐优化等。本文介绍了CSNS加速器的调试过程和结果。
The China Spallation Neutron Source (CSNS) accelerators consist of an 80 MeV H− linac and a 1.6 GeV proton rapid cycling synchrotron (RCS), which provides 1.6 GeV proton beam to the target at a repetition rate of 25 Hz. The beam commissioning of CSNS accelerators had been started since April 2017, and to the end of February 2020, the CSNS reached the design beam power of 100 kW. The most important issue in high-power beam commissioning is the beam loss control, as well as the control of induced activities, to meet the requirement of manual maintenance. A series of beam loss optimization work had been done to reduce the uncontrolled beam loss. Transverse and longitudinal matching in the MEBT was performed. For RCS commissioning, the orbit and lattice correction, the matching between the rf frequency and the dipole field, the tuning of the injection beam were performed. Many efforts have beam made to depress the effects of space charge and collective instability for beam loss control, such as injection optimization, longitudinal beam dynamics optimization, tune optimization. The beam commissioning procedure and results for CSNS accelerators are introduced in this paper.