Preliminary Design of a Bunching System for the CLIC Polarized Electron Source

Zhou, Feng

关键词: BEAM BUNCHERS;    DESIGN;    ELECTRON SOURCES;    LASERS;    LINEAR COLLIDERS;    COMPUTERIZED SIMULATION;    SPACE CHARGE Accelerators;    ACCPHY;   

DOI  :  10.2172/968510
RP-ID  :  SLAC-PUB-13780
PID  :  OSTI ID: 968510
Others  :  TRN: US1000077

学科分类：核物理和高能物理

美国|英语

来源: SciTech Connect

【 摘 要 】

Major parameters of the CLIC and ILC electron sources are given in Table I. It is shown that the CLIC source needs to provide 312 15-ps-long 2-GHz microbunches. There are two approaches to achieve the time structure [2]: one is to develop a 2-GHz optical pulse train, and the other to develop a 156-ns-long CW optical pulse and use an RF bunching system to generate 312 2-GHz microbunches. The former scheme may ease the RF bunching system but still need it to bunch 100-ps of microbunch down to 15-ps level. Otherwise, a huge amount of energy spread is accumulated when the beam is accelerated through downstream 2-GHz accelerator. In addition, in the former scheme, the space charge is high and surface charge is not yet proven in the parameter regime and 2-GHz mode locked laser is challenging. The latter scheme needs a high-efficiency bunching system to generate 312 15-ps microbunches with 2-GHz repetition rate but it has some notable advantages: a 156-ns CW laser technique is matured, and the charge limit behavior in the scheme is better characterized than that in the former case, as listed in the table. This note presents a design and modeling of the bunching system for the latter scheme to convert a 156-ns CW pulse to 312 15-ps long 2-GHz microbunches.