工业X光二极管重复频率实验研究

马勋; 袁建强; 刘宏伟; 王凌云; 姜苹

doi:10.11884/HPLPB201628.025007

工业X光二极管重复频率实验研究

中国工程物理研究院流体物理研究所，脉冲功率科学与技术重点实验室，四川绵阳 621900

Research on repetitive rate of industrial X-ray diode

摘要: 工业 X 光二极管型“单焦点”高重复频率闪光 X 光机在科学研究、工业检测等领域具有重要应用前景。基于光导开关脉冲驱动源开展了金属阴极工业 X 光二极管重复频率运行实验，采用烘烤处理方法研究阴极表面吸附特性对重复频率发射特性的影响；以二极管阻抗模型为理论基础，通过重复频率实验获得的二极管电压维持时间和阻抗特性分析等离子体扩散过程。研究表明：对于高阻抗结构工业 X 光二极管，金属阴极为表面吸附杂质或气体解吸附形成等离子体发射机制，一次放电后阴极表面对气体的再吸附过程限制了其在高重复频率条件下的电流发射能力，同时由于阴极等离子体扩散过程变慢使得二极管电压脉宽变长。具有高重复频率电流发射能力的阴极是发展“单焦点”重复频率 X 光机的基础。

关键词:

Abstract: The flash X-ray generator with an industrial X-ray diode would be widely applied in research and industrial detec-tion,which is capable of generating intense x-ray under high repetitive frame.An industrial X-ray diode was driven by the pulsed power supply under 100 Hz to 1 kHz,whose copper cathode was heated to analyze how the surface adsorption affects the electrons emission process.Plasma diffuse processes were investigated simply based on voltage duration and impedance model.The study shows that explosive emission electrons come from gas desorption on copper cathode surface,and the key factor affecting repeti-tive rate is not diode recovery.Gas absorption velocity between shots is under no more than 1 kHz,so it is a groundwork to devel-op a novel cathode capable of supplying enough electron beam with high repetitive rate.

工业X光二极管重复频率实验研究

中国工程物理研究院流体物理研究所，脉冲功率科学与技术重点实验室，四川绵阳 621900

关键词:

Research on repetitive rate of industrial X-ray diode

中国工程物理研究院流体物理研究所，脉冲功率科学与技术重点实验室，四川绵阳 621900

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