场致爆炸发射阴极有效发射面积研究
Experimental study on effective emitting area of explosive emitting cathode
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摘要: 通过改变阴阳极间隙，得到在不同外加电场情况下，场致爆炸发射石墨阴极有效发射面积随时间变化的实验结果。结果表明，在起始的一定时间内，阴极有效发射面积随时间的增加而增大。阴极有效发射面积达到1.0的时间随阴阳极间隙内电场的增加而减小；当二极管阴阳极之间的平均电场约为100 kV/cm时，阴极有效发射面积达到1.0的时间约为20 ns；阴极有效发射面积相对电压波形的延迟时间随电场的变化近似呈指数衰减曲线。Abstract: Variation relation between the effective emitting area of field induced explosive ementting graphite cathode and time has been acquired experimentally under different externally applied electric field corresponding to different anode cathode gaps. It is illustrated that the effective emitting area increase over time at the beginning of emission.The time for the effective emitting area to reach 1.0 decreases with increasing mean electric field in the gap. Under approximate 100 kV/cm mean electric field between anode and cathode, about 20 ns is needed for the effective emitting area to reach 1.0. The relative delay time of effective emitting area reaching 0.5 to 50 % voltage pulse with the electric field behaves as a decaying exponential curve．
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Key words:
- intense relativistic electron beams /
- cathode /
- diode /
- effective emitting area
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