Emission properties of explosive field emission cathodes
Emission properties of explosive field emission cathodes
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DOI：
10.1063/1.3646361
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发表时间：
2011-10
影响因子：
2.2
通讯作者：
A. Roy;A. Patel;R. Menon;Archana Sharma;D. Chakravarthy;D. Patil
中科院分区：
文献类型：
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作者：
A. Roy;A. Patel;R. Menon;Archana Sharma;D. Chakravarthy;D. Patil
本文给出了在平面二极管结构中，由石墨、不锈钢、聚合物丝绒、碳涂层和碳纤维（针型）等材料制成的爆炸场发射阴极等离子体膨胀速度和初始发射面积的研究结果。实验在LIA-200电子加速器上进行（200 kV，100 ns，4 kA）。二极管电压从28-225 kV变化，而电流密度从86-928 A/cm 2变化，脉冲持续时间为100 ns。实验得到的电子束二极管的电导率已与一维Child-Langmuir定律。结果发现，最初只有一部分阴极参与发射过程。对于不同的阴极材料，等离子体的膨胀速率为1.7-5.2 cm/μs，阳极-阴极间隙为4 mm。结果表明，等离子体膨胀速度随阴极直径的减小而增大。在加速脉冲开始时，整个阴极区都参与了电子轰击。
The research results of the explosive field emission cathode plasma expansion velocity and the initial emission area in the planar diode configuration with cathodes made of graphite, stainless steel, polymer velvet, carbon coated, and carbon fiber (needle type) cathodes are presented. The experiments have been performed at the electron accelerator LIA-200 (200 kV, 100 ns, and 4 kA). The diode voltage has been varied from 28–225 kV, whereas the current density has been varied from 86–928 A/cm2 with 100 ns pulse duration. The experimentally obtained electron beam diode perveance has been compared with the 1 dimensional Child-Langmuir- law. It was found that initially only a part of the cathode take part in the emission process. The plasma expands at 1.7–5.2 cm/μs for 4 mm anode-cathode gap for various cathode materials. It was found that the plasma expansion velocity increases with the decrease in the cathode diameter. At the beginning of the accelerating pulse, the entire cathode area participates in the e...