FEL2022

Spectral Control of THz Super-Radiant Spontaneous Undulator Radiation Driven by Ultrashort Electron Beam with Energy Spread

TUP26

23 Aug 2022, 16:00

2h

Exhibition Hall (Trieste Convention Centre)

Contributed Poster Novel acceleration and FEL concepts Tuesday posters

Speakers

Shan You Teng (Department of Physics, National Central University) Shih-Hung Chen (Department of Physics, National Central University)Dr An-ping Lee (National Synchrotron Radiation Research Center)Dr Ming-Chang Chou (National Synchrotron Radiation Research Center)Dr Hsin-Pai Hsueh (National Synchrotron Radiation Research Center)Dr Wei-Yuan Chiang (National Synchrotron Radiation Research Center) Wai-Keung Lau (National Synchrotron Radiation Research Center)Mr Pao Ting Lin (National Tsing Hua University)

Description

S.Y. Teng(1,2), S.H. Chen(1), W.Y. Chiang(2), M.C. Chou(2), H.P. Hsueh(2), W.K. Lau(2), A.P. Lee(2), P.T. Lin(3)
1 Department of Physics, NCU, Taoyuan, Taiwan
2 NSRRC, Hsinchu, Taiwan
3 Department of Engineering and System Science, NTHU, Hsinchu, Taiwan.

Intense coherent THz radiation has been generated from an 18-period, hybrid-type U100 planar undulator as it is driven by short relativistic electron pulses produced from the NSRRC photoinjector. However, it is observed that the number of output optical pulse cycles is much less than the number of undulator periods and therefore the radiation spectral bandwidth has been broadened. It is found that the dispersion of undulator with excessive energy spread is responsible for this undesired broadening of THz radiation spectrum. In this study, instead of using rectilinear rf bunch compression (i.e. velocity bunching) in photoinjector linac, we investigate the feasibility of using nonlinear magnetic bunch compression for spectral bandwidth control of coherent THz undulator radiation.

Proceedings

Paper

TUP26.pdf