FEL-THz束流收集器设计

Design of FEL-THz Beam Dump

束流收集器是加速器末端吸收高能粒子束的主要部件。本文针对中国工程物理研究院正在研制的自由电子激光相干强太赫兹源(FEL-THz)装置8 MV/5mA准连续电子束设计束流收集器,其内表面吸收平均功率达40kW。通过对收集器结构优化和四级磁铁对电子束扩束,将收集器长度控制在1.2m以内。优化收集器水冷结构及水流速度,使收集器的温度控制在355 K,满足高平均功率FEL-THz装置的使用要求。

The beam dump is the primary assembly used at the end of the accelerator to absorb high power electrons. In this paper, a beam dump was designed for 8 MV/5 mA CW electron beam of the terahertz free electron laser （FEL-THz） facility in China Acad- emy of Engineering Physics, whose inner surface absorbed average power is up to 40 kW. The beam dump design was based on a 1.2 m long copper cone whose inner sur- face absorbs the beam. The beam dump cooling structure and flow rate were optimized, so that the beam dump temperature was controlled at 355 K, to meet the requirements of high average power FEL-THz facility.