高平均功率太赫兹自由电子激光装置设计

Design of a high average power terahertz-FEL facility

摘要:

为满足材料和生物医学等研究需要，中国工程物理研究院(中物院)提出了高平均功率太赫兹自由电子激光(THz FEL)用户装置研制项目。该装置采用准连续波运行的工作模式，太赫兹平均功率约为10 W。通过调节电子束能量和摇摆器的磁场强度，装置输出波长可在100 μm(3 THz) ~300 μm(1 THz)进行调节，以满足不同用户的研究需要。装置主要包括电子源、主加速器、混合型摇摆器、激光谐振腔、太赫兹传输与探测系统等。装置将使用直流高压光阴极注入器作为电子源，主加速器为超导加速器，超导加速器后的电子束能量约8 MeV。该装置将建立成为一个用户装置。

Abstract:

To meet the requirements of material and biomedicine study，a terahertz Free Electron Laser(FEL) user facility project was proposed by China Academy of Engineering Physics(CAEP). The facility operates in the quasi CW mode and the average power is about 10 W. The wavelength of the light can be adjusted between 100 μm/(3 THz) to 300 μm/(1 THz) according to the needs of users by changing the electron energy and the magnetic field of the wiggler. The facility mainly consists of the electron source，the main accelerating structure，the hybrid wiggler，the optical oscillator cavity，the terahertz-ray transmission system and the detector. In order to achieve the high brightness beam，the photocathode DC gun is used as the electron source. The electron will obtain energy by passing through a superconducting accelerator，and the electron energy after the accelerator is about 8 MeV，which is suitable to obtain the terahertz light. The facility will be built as a user facility.