Characterization of plasma expansion dynamics in a high power diode with a carbon-fiber-aluminum cathode

被引：21

作者：

Ju, J. -C. ^{[1
,2
]}

Liu, L. ^{[1
]}

Cai, D. ^{[1
]}

机构：

[1] Natl Univ Def Technol, Coll Optoelect Sci & Engn, Changsha 410073, Hunan, Peoples R China

[2] Univ Paris 11, CNRS, Lab Phys Gaz & Plasmas, F-91405 Orsay, France

来源：

APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 23期

基金：

国家高技术研究发展计划(863计划);

关键词：

EXPLOSIVE ELECTRON-EMISSION; VACUUM;

D O I：

10.1063/1.4882162

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Thermal plasma expansion is characterised during the operation of a high power diode with an explosive emission carbon-fiber-aluminum cathode driven by a 250 kV, 150 ns accelerating pulse. It is found that a quasi-stationary state of plasma expansion is obtained during the main part of the accelerating pulse and the whole plasma expansion exhibits an "U"-shape velocity evolution. A theoretical model describing the dynamics of plasma expansion is developed, which indicates that the plasma expansion velocity is determined by equilibrium between the diode current density and plasma thermal electron current density. (C) 2014 AIP Publishing LLC.

引用

页数：4

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