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Title: Simulative research on the anode plasma dynamics in the high-power electron beam diode

Anode plasma generated by electron beams could limit the electrical pulse-length, modify the impedance and stability of diode, and affect the generator to diode power coupling. In this paper, a particle-in-cell code is used to study the dynamics of anode plasma in the high-power electron beam diode. The effect of gas type, dynamic characteristic of ions on the diode operation with bipolar flow model are presented. With anode plasma appearing, the amplitude of diode current is increased due to charge neutralizations of electron flow. The lever of neutralization can be expressed using saturation factor. At same pressure of the anode gas layer, the saturation factor of CO{sub 2} is bigger than the H{sub 2}O vapor, namely, the generation rate of C{sup +} ions is larger than the H{sup +} ions at the same pressure. The transition time of ions in the anode-cathode gap could be used to estimate the time of diode current maximum.
Authors:
; ; ; ; ;  [1]
  1. College of Optoelectric Science and Engineering, National University of Defense Technology, Hunan 410073 (China)
Publication Date:
OSTI Identifier:
22490983
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 7; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLITUDES; ANODES; CARBON DIOXIDE; CARBON IONS; CATHODES; CURRENTS; ELECTRON BEAMS; FLOW MODELS; HYDROGEN IONS 1 PLUS; IMPEDANCE; PLASMA; PULSES; STABILITY; WATER VAPOR