skip to main content

SciTech ConnectSciTech Connect

Title: Effect of secondary emission on the argon plasma afterglow with large dust density

A zero-dimensional, space-averaged model for argon plasma afterglow with large dust density is developed. In the model, three groups of electrons in the plasma afterglow are assumed: (i) thermal electrons with Maxwellian distribution, (ii) energetic electrons generated by metastable-metastable collisions (metastable pooling), and (iii) secondary electrons generated at collisions of ions with the electrodes, which have sufficiently large negative voltages in the afterglow. The model calculates the time-dependencies for electron densities in plasma afterglow based on experimental decay times for metastable density and electrode bias. The effect of secondary emission on electron density in the afterglow is estimated by varying secondary emission yields. It is found that this effect is less important than metastable pooling. The case of dust-free plasma afterglow is considered also, and it is found that in the afterglow the effect of secondary emission may be more important than metastable pooling. The secondary emission may increase thermal electron density n{sub e} in dust-free and dusty plasma afterglows on a few ten percentages. The calculated time dependencies for n{sub e} in dust-free and dusty plasma afterglows describe well the experimental results.
Authors:
; ;  [1] ;  [2]
  1. V.N. Karazin Kharkiv National University, Svobody Sq. 4, 61022 Kharkiv (Ukraine)
  2. Institute of Physics Belgrade, University of Belgrade, POB57 11080 Belgrade (Serbia)
Publication Date:
OSTI Identifier:
22408155
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 2; 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; AFTERGLOW; ARGON; BOLTZMANN STATISTICS; COLLISIONS; DUSTS; ELECTRIC POTENTIAL; ELECTRODES; ELECTRON DENSITY; PLASMA; SECONDARY EMISSION; TAIL ELECTRONS