A Compact, Wavelength Tunable MW-THz FEL Amplifier

Chia-Hsiang Chen, Fu Chao, Yu-Chung Chiu, Yen-Chieh Huang, An-Ping Lee, Ming Wu, Gang Zhao, Schaa, Volker RW (Ed.), Petit-Jean-Genaz, Christine (Ed.), Kim, Dong Eon (Ed.), Kim, Kyung Sook (Ed.), Ko, In Soo (Ed.)
We propose a compact scheme of THz free electron laser (FEL) amplifier within a 3.5 m long beam line. The amplification of a tunable THz seed laser in an FEL amplifier is driven by an rf photoinjector*. The THz seed laser is an optical parametric amplifier** pumped by a 1064-nm microchip laser and an external-cavity tunable diode laser. By varying the beam energy and undulator parameter, the radiation frequency of the THz FEL amplifier can be tunable in a broad spectral range between 1.5 and
more » ... between 1.5 and 3.0 THz. Moreover, to extract more radiation power from the electron beam within a short undulator, we employ a linearly tapered undulator in our design. The influence of the seed power on the electron-laser interaction in the undulator is studied in some detail for the FEL amplification. Our simulation results show that the radiation power of the THz FEL amplifier can achieve few MW with a 10-W seed power.
doi:10.18429/jacow-ipac2016-mopow035 fatcat:l2xtldwlrvap3jh4gdvulhwarm