Preliminary study of Multi-color optical manipulation system for Steady State Microbunching in storage ring.

Pohsun Wu^1*, Alexander W. Chao¹, Ci-Ling Pan¹

¹Department of Physics, National Tsing Hua University, Hsinchu, Taiwan

* Presenter:Pohsun Wu, email:j77859693@gmail.com

Steady State Microbunching (SSMB) is one of the schemes for generation of high average power coherent synchrotron radiation(CSR) in a storage ring. As the first proof-of-principle experiment has succeeded at the MLS storage ring in Berlin, it could be a promising candidate of kW level EUV source for lithography with the advantage of narrow linewidth, high power, collimated and clean beam. To satisfy the requirement of SSMB modulation field, the turn by turn phase must be stable and the field need be as high as ~MV/m over several meters of the modulation length. We have studied the effect on microbunch formation and maintenance of turn by turn phase with arbitrary phase jitter with noise spectrum from a commercially available relatively high-power continuous wave laser with a MW level enhancement cavity. We found that the bunch length can be three times smaller in two-color scheme and six times smaller in three color scheme under the optimized power ratio and relative phase. Besides, we can also set it to a phase stable region in another combination.

Keywords: Steady State Microbunching, Coherent Synchrotron Radiation