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介绍了中国科学院国家空间科学中心新建成的空间电子辐射环境探测载荷测试定标试验平台.该平台由中、高能极弱流电子加速器以及内置多维真空转台的真空靶室试验终端组成,用于对星载空间电子辐射探测器进行地面加速器测试定标.重点描述了为得到中能极弱流均匀平行束,采用电子轨迹程序Egun对中能极弱流电子加速器进行的物理设计和模拟计算,给出球形结构电子枪在栅网孔不加栅网、加理想栅网和直径1mm孔栅网以及在不同加速管出口能量情况下,初聚系统和加速管以及经过二次扩束时输运段中电子轨迹的模拟结果.最终得出能够实现电子枪初始束流减弱8个数量级,获得满足测试定标试验需求的极弱流均匀平行电子束(在试验终端直径50 mm靶上束流面密度为10~5~10~9 cm~(-2)·s~(-1))的结论.
This paper introduces a new calibration platform of space electron radiation environment detection load test and calibration for the National Space Science Center of the Chinese Academy of Sciences.The platform consists of medium and high energy very weak flow electron accelerator and vacuum target chamber test terminals with built- Spaceborne space electron radiation detector ground acceleration test calibration.Here described in order to obtain a very weak uniform flux parallel beam, the electron trajectory program Egun on the very weak flow electron accelerator for the physical design and simulation calculations to give The ball-shaped structure of the electron gun grid in the grid without grid, plus the ideal grid and the diameter of 1mm grid of holes and at different accelerating tube exit energy case, the initial polymerization system and accelerating tube and after the second beam expansion in the transport section Electron trajectory.Finally, it can be concluded that the initial beam current of the electron gun can be reduced by 8 orders of magnitude, and the uniform parallel electron beam with extremely weak flow satisfying the requirements of the test calibration test (beam density of 10 ~ 5 ~ 10 ~ 9 cm ~ (-2) · s ~ (-1)).