中物院高功率THz FEL装置波导的物理设计

Effect investigation of waveguide for CAEP high power THz FEL

针对中物院高功率太赫兹自由电子激光(THz FEL)装置,结合目前FEL实验的实际情况,完成了THz波段波导光腔对光腔品质影响的理论分析和模拟计算,确定了不同频段实验所需合适的波导间隙。理论分析与数值模拟表明,光腔加入波导管后减少了腔损耗,使腔内增益提高约30%。完成了不同波导间隙在不同频段的影响计算,并确定了不同频段合适的波导间隙。进一步考察了波导间隙在14 mm和22 mm时对光腔质量及品质的影响。

Investigations of using the waveguide in the whole optical cavity of CAEP high power THz-Free Electron Laser(FEL)device are carried out.The influences of waveguide on the quality of optical cavity,such as the loss,the gain and output power of THz laser at different frequencies are studied by calculation and theoretical analysis.The results show that the gain of optical cavity can be increased almost by 30%.Furthermore,the influences of two waveguide sizes,14 mm and 22 mm,are compared.This work will be helpful to the designs of CAEP THz-FEL equipment.