Jitter Studies for a 2.4 GeV Light Source Accelerator Using LiTrack

Penn, Gregory E

关键词: 43;    ACCELERATORS;    CAVITIES;    EFFICIENCY;    ELECTRON BEAMS;    ELECTRONS;    FREE ELECTRON LASERS;    LASERS;    LIGHT SOURCES;    PERFORMANCE;    PRODUCTION;    SENSITIVITY FEL;    accelerator;    electron beam;   

DOI  :  10.2172/986209
RP-ID  :  LBNL-3768E
PID  :  OSTI ID: 986209
Others  :  TRN: US1006350

美国|英语

来源: SciTech Connect

【 摘 要 】

Electron beam quality is an important factor in the performance of a free electron laser (FEL). Parameters of particular interest are the electron beam energy, slice emittance and energy spread, peak current, and energy chirp. Jitter in average energy is typically many times the slice energy spread. A seeded FEL is sensitive not only to these local properties but also to factors such as shot-to-shot consistency and the uniformity of the energy and current profiles across the bunch. The timing and bunch length jitter should be controlled to maximize the interval of time over which the electron beam can be reliably seeded by a laser to produce good output in the FEL. LiTrack, a one-dimensional tracking code which includes the effect of longitudinal wakefields, is used to study the sensitivity of the accelerator portion of a 2.4 GeV FEL to sources of variability such as the radio frequency (RF) cavities, chicanes, and the timing and efficiency of electron production at the photocathode. The main contributors to jitter in the resulting electron beam are identified and quantified for various figures of merit.