We have designed a relatively simple, compact and
powerful THz-FEL (terahertz free electron laser)
amplifier in Kyoto University. The target wavelength
range of the amplifier is 150–340 m, corresponding to
0.5-1.1 THz. The system consists of 1.6 cell photocathode
radio frequency (RF) gun, THz wave parametric
generator, focusing solenoid, transport line, and 120 cm
long undulator with 30 periods. A start-to-end simulation
in the institute of advanced energy Kyoto University has
been conducted to estimate the performance of the
designed system. Tracking of the electron beam from the
photocathode RF gun up to the undulator entrance has
been done using Parmela code while Genesis 1.3 code has
been used to estimate the FEL interaction in the
undulator. For feasibility study the FEL temporal
distribution at resonance wavelength 186 m was
determined. The results show that 1250% amplification
could be achieved in the resonance wavelength in the
present design compared with the seed THz power.
Details of the design and calculation conditions together
with the performance test are presented in this paper.