Design of a 250 MeV High Brightness Electron Linac System using Nonlinear Bunch Compressor

Chia-Hsiang Chen^1,2*, Wai-Keung Lau¹, An-Ping Lee¹, Ming-Chang Chou¹, Wei-Yuan Chiang¹, S. Y. Deng³

¹NSRRC, Hsinchu, Taiwan
²IPT/EE, National Tsing-Hua Unversity, Hsinchu, Taiwan
³Physics, National Central University, Taoyuan, Taiwan

* Presenter:Chia-Hsiang Chen, email:chen.chiahsiang@nsrrc.org.tw

A nonlinear bunch compressor for the NSRRC 300 MeV S-band photoinjector linac system is being studied. Instead of using a conventional rf harmonic linearizer, this specific bunch compressor design is to use linearization optics to correct the nonlinear energy-time correlation of electron distribution in longitudinal phase space. In this study, the design of this compressor is guided by analytical theory and particle tracking simulation. Beam dynamics in the linac system including collective effects such as space charge, wake fields and coherent synchrotron radiation (CSR) are studied. This system can be used to drive the proposed EUV Free Electron Laser (FEL) facility. Variation of bunch compressor performance due to system parameter changes such as rf and magnetic fields stabilities will also be investigated.

Keywords: free electron laser, bunch compressor, linac