激光加热阴极式电子枪研究

激光加热阴极式电子枪研究 Research on laser heated cathodic electron gun 王昭漫 WANG Zhaoman 1 first-author 黄安国 HUANG Anguo 1 桑兴华 SANG Xinghua 2 胡仁志 HU Renzhi 1 许可 XU Ke 1 华中科技大学材料成型与模具技术国家重点实验室 华中科技大学材料成型与模具技术国家重点实验室 State Key Laboratory of Material Forming and Mould Technology,Huazhong University of Science and Technology State Key Laboratory of Material Forming and Mould Technology,Huazhong University of Science and Technology 中国航空制造技术研究院高能束流加工技术国防科技重点实验室 中国航空制造技术研究院高能束流加工技术国防科技重点实验室 National Key Laboratory of Science and Technology on Power Beam Processes,AVIC Manufacturing Technology Institute National Key Laboratory of Science and Technology on Power Beam Processes,AVIC Manufacturing Technology Institute 针对目前主流热发射电子枪普遍存在的外加电流产生磁场从而影响热电子的问题,提出了激光加热阴极模式。该加热模式可有效消除磁场的影响,从而提高束流品质及阴极寿命。基于Q60-A电子束设备,通过仿真研究与实验验证,对激光加热阴极及电子运动过程进行系统分析,确定了激光器选型方案和束源部件结构优化方案。结果表明,推荐激光波长为1 064 nm,阴极工作温度为2 650 K,阴极达到工作温度所需激光功率为377 W,维持阴极工作温度基本稳定的临界功率为160 W,设计优化了新束源部件结构尺寸,当阴阳极间距离18 mm、阳极孔径10 mm、栅极球面半径20 mm时,电子束流品质理想,并通过实验验证了仿真结果的准确性及激光器选型的合理性。本研究为激光加热阴极式电子枪的系统化设计及工程化应用提供了参考依据和有益指导。 In view of the problem that the magnetic field generated by the external current affects the hot electrons in the mainstream thermal emission electron guns, the laser heating cathode mode was proposed. The heating mode can effectively eliminate the influence of the magnetic field, so as to improve the beam quality and cathode life. Based on Q60-A electron beam equipment,through simulation and experimental verification, the process of laser heating cathode and electron movement are systematically analyzed, and the selection scheme of laser and the structure optimization scheme of beam source components are determined. The results show that the recommended laser wavelength is 1 064 nm,the operating temperature of the cathode is 2 650 K, the laser power required to reach the operating temperature of the cathode is 377 W, and the critical power to maintain the operating temperature of the cathode is 160 W. The structure size of the new beam source components is optimized. The distance between anode and cathode is 18 mm, the anode aperture is 10 mm, and the radius of grid sphere is 20 mm. The electron beam quality is ideal at this time. The accuracy of simulation results and the rationality of laser selection are verified by experiments. This study provides reference and useful guidance for the systematic design and engineering application of the laser heated cathode type electron gun.105 热发射电子枪 激光 阴极 束源部件 仿真模拟 thermal emission electron gun laser cath-ode beam source components simulation TG43 国家重点研发计划（2017YFB1103100） 2022-03-08 11 51