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Title: A relativistic self-consistent model for studying enhancement of space charge limited field emission due to counter-streaming ions

Recently, field emission has attracted increasing attention despite the practical limitation that field emitters operate below the Child-Langmuir space charge limit. By introducing counter-streaming ion flow to neutralize the electron charge density, the space charge limited field emission (SCLFE) current can be dramatically enhanced. In this work, we have developed a relativistic self-consistent model for studying the enhancement of SCLFE by a counter-streaming ion current. The maximum enhancement is found when the ion effect is saturated, as shown analytically. The solutions in non-relativistic, intermediate, and ultra-relativistic regimes are obtained and verified with 1-D particle-in-cell simulations. This self-consistent model is general and can also serve as a benchmark or comparison for verification of simulation codes, as well as extension to higher dimensions.
Authors:
;  [1] ;  [2] ;  [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [4] ;  [2]
  1. NanoScience Simulation Laboratory, Fu Jen Catholic University, New Taipei City 24205, Taiwan (China)
  2. (United States)
  3. (China)
  4. Plasma Theory and Simulation Group, Department of Nuclear Engineering, University of California, Berkeley, California 94720 (United States)
Publication Date:
OSTI Identifier:
22252000
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 2; Other Information: (c) 2014 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; CHARGE DENSITY; COMPARATIVE EVALUATIONS; ELECTRONS; FIELD EMISSION; IONS; RELATIVISTIC RANGE; SIMULATION; SPACE CHARGE; VERIFICATION