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CiADS束流负载效应前馈补偿的仿真评估

Simulation and Evaluation of Beam Loading Feedforward Compensation for CiADS Linac
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摘要 在高功率超导质子直线加速器中,束流负载效应是影响超导腔幅相稳定性的一个重要因素。本工作基于谐振腔建场模型,开发了超导腔系统束流负载效应的时域仿真程序,分析了束流负载效应对超导腔幅相稳定性的影响,并在C-ADS注入器Ⅱ上通过相关实验测量对仿真结果进行了验证。利用该程序,评估了CiADS超导直线加速器脉冲束流的脉冲长度,以及前馈补偿的时序抖动和束流纹波等因素对腔中电磁场幅相稳定度的影响。仿真结果表明:在当前CiADS直线加速器设计参数下,为满足超导腔中电磁场0.1%与0.1°的幅相稳定度指标,前馈时序抖动的偏差不能超过0.79μs,束流流强的直流偏差不能超过0.9%,并且给出了束流纹波的最大抖动幅值与纹波频率之间的关系。这些结果将为CiADS超导直线加速器相关子系统技术指标的确定提供依据。 For a high power superconducting proton linac,the transient beam loading effect is an important factor affecting the amplitude and phase stability of the electromagnetic field in a superconducting cavity.Based on the resonant cavity field model,a time-domain simulation code for the beam loading effect in a superconducting cavity was developed,and the simulation results were verified in the prototype injectorⅡof C-ADS.It was then evaluated the influence of pulse width,feedforward timing jitter and beam ripple for CiADS.The simulation results,to meet the design specification,showed that the Radio frequency(RF)fluctuations for each cavity should be less than 0.1%in amplitude and 0.1°in phase.And the feedforward timing jitter should not exceed 0.79μs,the beam DC deviation should not exceed 0.9%.The relationship between the maximum ripple amplitude and the ripple frequency was given.These results will provide a basis for determining technical specifications of relevant sub-systems of CiADS.
作者 徐呈业 王志军 高郑 黄贵荣 黄燃 马瑾颖 XU Chengye;WANG Zhijun;GAO Zheng;HUANG Guirong;HUANG Ran;MA Jinying(Institute of modern Physics,Chinese Academy of Science,Lanzhou 730000,China;University of Chinese Academy of Science,Beijing,100049,China)
出处 《原子核物理评论》 CAS CSCD 北大核心 2020年第4期848-853,共6页 Nuclear Physics Review
基金 国家自然科学基金联合基金(U1730122)
关键词 CiADS 超导质子直线加速器 束流负载效应 前馈 误差评估 CiADS superconducting proton linac beam loading feedforward error evaluation
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