Effect of the transverse parasitic mode on beam performance for the ADS driver linac in China  

作　　者：程鹏 裴士伦 王九庆 李智慧 

机构地区：[1]Institute of High Energy Physics, Chinese Academy of Sciences

出　　处：《Chinese Physics C》2015年第5期92-97,共6页中国物理C（英文版）

摘　　要：The ADS （Accelerator Driven subcritical System） driver linac in China is designed to run in CW （Continuous Wave） mode with 10 mA designed beam current. In this scenario, the beam-induced parasitic modes in the ADS driver linac may make the beam unstable or deteriorate the beam performance. To evaluate the parasitic mode effect on the beam dynamics systematically, simulation studies using the ROOT-based numerical code SMD have been conducted. The longitudinal beam instability induced by the HOMs （High Order Modes） and SOMs （Same Order Modes） has little effect on the longitudinal beam performance for the current ADS driver linac design based on the 10 MeV/325 MHz injector I from previous studies. Here the transverse parasitic mode （i.e., dipole HOM） effect on the transverse beam performance at the ADS driver linac exit is investigated. To more reasonably quantify the dipole mode effect, the multi-bunch effective emittance is introduced in this paper.The ADS （Accelerator Driven subcritical System） driver linac in China is designed to run in CW （Continuous Wave） mode with 10 mA designed beam current. In this scenario, the beam-induced parasitic modes in the ADS driver linac may make the beam unstable or deteriorate the beam performance. To evaluate the parasitic mode effect on the beam dynamics systematically, simulation studies using the ROOT-based numerical code SMD have been conducted. The longitudinal beam instability induced by the HOMs （High Order Modes） and SOMs （Same Order Modes） has little effect on the longitudinal beam performance for the current ADS driver linac design based on the 10 MeV/325 MHz injector I from previous studies. Here the transverse parasitic mode （i.e., dipole HOM） effect on the transverse beam performance at the ADS driver linac exit is investigated. To more reasonably quantify the dipole mode effect, the multi-bunch effective emittance is introduced in this paper.

关 键 词：parasitic mode dipole mode HOM beam dynamics beam instability 

分 类 号：TL53[核科学技术—核技术及应用] TP316.7[自动化与计算机技术—计算机软件与理论]