Optimization of transverse emittance for RF-driven negative hydrogen ion source developed at China Spallation Neutron Source.

Journal of the Optical Society of America and Review of Scientific Instruments Pub Date : 2022-05-01 DOI:10.1063/5.0086220

R. Zhu, Weidong Chen, Hui Li, H. Ouyang, Shengjin Liu, Yongchuan Xiao, Y. Lü, X. Cao, Fa-Bin Li, Jilei Sun, Shunming Liu, K. Xue

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引用次数: 2

Abstract

The China Spallation Neutron Source project Phase-II aims to deliver 500 kW beam power to the spallation target. To meet the beam power requirement, an RF-driven negative hydrogen ion source with an external-antenna has been developed. In order to optimize the beam transmission through the radio frequency quadrupole and the downstream linac, the low energy beam transport line needs to be carefully studied and the transverse emittance is focused in this paper. With computational simulation and experimental verification, the emittance growth caused by nonlinear magnetic fields of the solenoid and the residual magnetic fields at the measuring position has been carefully analyzed. The measurement uncertainty of the double-slit scanner has also been quantitatively estimated. Using the same plasma-beam boundary setting, the beam extraction system is also optimized with particle tracking simulation in CST PARTICLE STUDIO.

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中国散裂中子源研制的rf驱动负氢离子源横向发射度优化。

中国散裂中子源二期工程的目标是向散裂目标输送500千瓦束流功率。为了满足束流功率的要求，研制了一种带外置天线的射频驱动负氢离子源。为了优化束流通过射频四极杆和下游直线器的传输，需要对低能束流输运线进行仔细研究，并重点研究了束流的横向发射度。通过计算仿真和实验验证，仔细分析了电磁阀非线性磁场和测量位置残余磁场引起的发射度增长。对双缝扫描仪的测量不确定度进行了定量估计。采用相同的等离子体束边界设置，在CST particle STUDIO中对光束提取系统进行了粒子跟踪仿真优化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Journal of the Optical Society of America and Review of Scientific Instruments

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