基于粒度差异的鳞片石墨大面积爆炸电子发射阴极性能实验研究

Tingxu Chen, Tianming Li, Liu Yang, Hao Li, Haiyang Wang, Renjie Cheng, Jiaoyin Wang, Hao Zhou, B. Hu, Hao Fu
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引用次数: 0

摘要

石墨因其寿命长、重复频率性能好而成为大功率真空电子装置中最常用的大面积阴极材料,但其粒度选择方案尚未阐明。因此,本研究对不同粒度的鳞片石墨大面积爆炸电子发射阴极的爆炸电子发射特性进行了研究。在相同峰值电压下,320 目鳞片石墨的电流延迟比其他样品减少了 0.2-0.9 ns。根据墨菲-古德方程,计算了每个样品在引燃阶段的发射性能,320 目鳞片石墨的阈值特性明显优于其他样品。空间电荷限流形成后,所有样品的等离子体膨胀率均为 1.2±0.2cm/μs,样品之间的差异不超过 4%。我们的研究为石墨基大面积爆炸电子发射阴极原材料的选择提供了有力依据,有助于跨场大功率真空器件的发展。
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Experimental study of flake graphite large-area explosion electron emission cathode performance based on particle size discrepancy
Graphite is the most commonly used large-area cathode material in the high-power vacuum electron device for its long life and good repetitive-frequency performance, but its particle size selection scheme has not been elucidated. Therefore, in the present work, the explosive electron emission properties of flake graphite large area explosive electron emission cathodes with varied particle sizes are studied. The 320 mesh flake graphite has a current delay reduction of 0.2–0.9 ns compared to other samples at the same peak voltage. According to the Murphy–Good equation, the emission performance of each sample during the priming stage was calculated, and the threshold characteristics of 320 mesh flake graphite were significantly better than the other samples. After the space charge limited current is formed, the plasma expansion rate of all samples is 1.2±0.2cm/μs with a difference not exceeding 4% between samples. Our research provides a strong basis for the selection of raw materials for graphite based large area explosive electron emission cathodes and contributes to the development of cross-field high-power vacuum devices.
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