关键词: 
BEAMPATH /
接受度 /
高频特性 /
稳定性 /
空间电荷效应

摘要: 采用多粒子跟踪程序BEAMPATH 对SSC-LINAC 重离子RFQ 直线加速器进行动力学模拟，分别对RFQ 的接受度、高频特性、束流稳定性、空间电荷效应等进行了分析。该RFQ具有很大的纵向接受度，有利于束流在RFQ中的传输；高频特性研究表明，翼间电压设定在理论值以上时，该RFQ都能保持较好的束流特性；束流稳定性分析结果表明，该RFQ具有很大的束流失配容忍度；空间电荷效应研究表明，当束流强度低于0.5 mA时，束流传输不受影响。综合研究结果表明，53.667 MHz重离子RFQ具有较好的动力学特性，满足SSC-LINAC直线加速器的设计要求。The RFQ beam dynamics of a heavy ion linac was investigated in this paper and the BEAMPATH code was employed in this study. The main research was focused on the beam performances depending on longitudinal acceptance, RF properties, beam instability and space charge effect. The RFQ has large longitudinal acceptance in design, which brings the beam performances well. In the RF parameter study, the beam can keep good transmission in the acceleration even the vane voltage is larger than the theoretical value. It is also shown that the RFQ has a large robustness for the mismatch of the input beam by the analysis of the beam instability.Furthermore, the beam evolution is independent on the space charge effect when the beam current is less than 0.5 emA. The preliminary analysis of the beam dynamics shows that the 53.667 MHz heavy ion RFQ has a promising performance, which meets the requirements of SSC-LINAC.