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Title: Instability of plasma plume of micro-hollow cathode discharge

The micro-hollow cathode gas discharge driven by thermionic emission is studied using the two-dimensional particle-in-cell Monte Carlo collisions simulation. The electron current is extracted from the plasma plume penetrating into the keeper–anode space through a small keeper orifice from the cathode-keeper space. The results of simulations and a simplified analytical model showed that the plasma density and extracted current can exhibit deep modulation in the range of frequencies of tens of MHz. This modulation appears when the space-charge limited current between the plume boundary and the anode exceeds the plasma thermal electron current through the orifice.
Authors:
 [1] ; ; ;  [2]
  1. Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, Austin, Texas 78712 (United States)
  2. Department of Physics, Technion, 32000 Haifa (Israel)
Publication Date:
OSTI Identifier:
22489876
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 11; 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; ANODES; COMPUTERIZED SIMULATION; CURRENTS; ELECTRIC DISCHARGES; ELECTRONS; HOLLOW CATHODES; MHZ RANGE; MODULATION; MONTE CARLO METHOD; ORIFICES; PLASMA DENSITY; PLASMA INSTABILITY; PLUMES; SPACE CHARGE; THERMIONIC EMISSION; TWO-DIMENSIONAL CALCULATIONS