Aerosol microparticles and emission characteristics of the pulsed high-current vacuum diode in a microsecond range

Proceedings ISDEIV. 19th International Symposium on Discharges and Electrical Insulation in Vacuum (Cat. No.00CH37041) Pub Date : 2000-09-18 DOI:10.1109/DEIV.2000.877258

Y. Kolyada, O. Bulanchuk, V. Fedun, I. Onishchenko

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引用次数: 4

Abstract

Vacuum electrical breakdown of extended gaps (tens of cm and more) by a high voltage (1-2 MV) microsecond pulses and the cold cathode material influence on an electron beam formation have been investigated. It has been established, that drop fraction (aerosol microparticles) of a cathode torch influences essentially on the vacuum electrical breakdown development for microsecond pulse duration. The characteristic sizes of the microparticles are experimentally measured and calculated. The main part of the microparticles has a size about the length of Fermi electron's free run in metals. The radius of graphite particles exceeds by almost three orders that of the metal (Al, Fe, Cu). In the case of graphite cathodes, the diode operation can be optimized for receiving extreme beam parameters. It has been calculated that the deformation of a potential barrier in a vicinity of the cathode raises considerably the probability of electron tunneling. It can lead to the development of explosive electron emission.

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微秒范围内脉冲大电流真空二极管的气溶胶微粒和发射特性

本文研究了高压(1-2毫伏)微秒脉冲对扩展间隙(数十厘米及以上)的真空击穿，以及冷阴极材料对电子束形成的影响。在微秒脉冲持续时间内，阴极炬的液滴分数(气溶胶微粒)对真空电击穿的发展有重要影响。实验测量和计算了微粒子的特征尺寸。微粒的主要部分的大小与金属中费米电子的自由运动长度相当。石墨颗粒的半径几乎超过金属(Al, Fe, Cu)的三倍。在石墨阴极的情况下，二极管的操作可以优化为接收极端光束参数。据计算，阴极附近势垒的变形大大提高了电子隧穿的可能性。它可以导致爆炸电子发射的发展。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings ISDEIV. 19th International Symposium on Discharges and Electrical Insulation in Vacuum (Cat. No.00CH37041)

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