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首页> 外文期刊>Advances in high energy physics >Influence of Cathode Diameter on the Operation of a Planar Diode with an Explosive Emission Cathode
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Influence of Cathode Diameter on the Operation of a Planar Diode with an Explosive Emission Cathode

机译：阴极直径对爆炸发射阴极平面二极管工作的影响

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This paper presents the results of experimental investigations into the current-voltage characteristics of a planar diode with an explosive emission cathode made from graphite. Studies were performed using a TEU-500 pulsed electron accelerator (350–500 keV, 100 ns, 250 J per pulse). Duration of diode operation, in a mode when electron current is limited by the emissive ability of the graphite cathode, is 15–20 ns. The contribution of the cathode periphery to total electron current appears only as an increase in the emissive surface area due to an expansion of explosive plasma. Investigations of an ion diode with a graphite cathode (plane and focusing geometry) were also carried out. Experiments were performed using a TEMP-4M ion accelerator, which forms two nanosecond pulses: the first negative pulse (150–200 kV, 300–600 ns) followed by the second positive (250–300 kV, 150 ns). Total diode current in the first pulse is well described by the Child-Langmuir law for electron current at a constant rate of plasma expansion, equal to 1.3 cm/μs. It is shown that for an area of flat cathode over 25 cm2, the influence of edge contribution does not exceed measurement error of total diode electron current (10%).
机译：本文介绍了实验研究的结果，该实验研究了具有由石墨制成的爆炸发射阴极的平面二极管的电流-电压特性。使用TEU-500脉冲电子加速器（350-500 keV，100 ns，每个脉冲250 J）进行研究。在电子电流受石墨阴极的发射能力限制的模式下，二极管工作的持续时间为15–20 ns。由于爆炸性等离子体的膨胀，阴极外围对总电子电流的贡献仅表现为发射表面积的增加。还对带有石墨阴极的离子二极管（平面和聚焦几何形状）进行了研究。使用TEMP-4M离子加速器进行实验，该离子加速器形成两个纳秒脉冲：第一个负脉冲（150-200 kV，300-600 ns），然后是第二个正脉冲（250-300 kV，150 ns）。 Child-Langmuir定律很好地描述了第一脉冲中的总二极管电流，该电流以恒定的等离子膨胀率（等于1.3μcm/μs）用于电子电流。结果表明，对于面积超过25 cm2的平面阴极，边缘贡献的影响不会超过总二极管电子电流的测量误差（10％）。

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