Lorentz detuning and tuning system study of 3+1/2cell DC-SC photo-injector for PKU-FEL  

作　　者：徐文灿 全胜文 赵夔 朱凤 

机构地区：[1]RF Superconducting Accelerator Laboratory,IHIP,Peking University,Beijing 100871,China

出　　处：《Chinese Physics C》2008年第3期215-217,共3页中国物理C（英文版）

基　　金：Supported by Major State Basic Research Development Program of China(2002CB713600)

摘　　要：A 3＋1/2cell DC-SC photo-injector for PKU-FEL facility is under development, which is an upgrade design of the successful 1-4-1/2cell DC-SC photo-injector. The Lorentz detuning and tuning structure for the 3＋1/2cell superconducting cavity is presented in this paper. The Lorentz force detuning coefficient is 1.2 Hz/（MV/m）^2 with double stiffening rings for the half cell and single stiffening rings between the adjacent TESLA cells. With the special stiffening structure, the 3＋1/2cell whole cavity needs only one tuner. The influences of the tuning on frequency shift, field flatness and average gradient are discussed in this paper. The simulation results show that the stiffening rings＇ design is successful.A 3＋1/2cell DC-SC photo-injector for PKU-FEL facility is under development, which is an upgrade design of the successful 1-4-1/2cell DC-SC photo-injector. The Lorentz detuning and tuning structure for the 3＋1/2cell superconducting cavity is presented in this paper. The Lorentz force detuning coefficient is 1.2 Hz/（MV/m）^2 with double stiffening rings for the half cell and single stiffening rings between the adjacent TESLA cells. With the special stiffening structure, the 3＋1/2cell whole cavity needs only one tuner. The influences of the tuning on frequency shift, field flatness and average gradient are discussed in this paper. The simulation results show that the stiffening rings＇ design is successful.

关 键 词：3＋1/2cell DC-SC photo-injector Lorentz detuning tuning structure 

分 类 号：TL503[核科学技术—核技术及应用]