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Radiation transport in kinetic simulations and the influence of photoemission on electron current in self-sustaining discharges

Journal Article · · Journal of Physics. D, Applied Physics
 [1];  [1];  [2];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of Iowa, Iowa City, IA (United States)

A kinetic description for electronic excitation of helium for principal quantum number n $$\leqslant $$ 4 has been included into a particle-in-cell (PIC) simulation utilizing direct simulation Monte Carlo (DSMC) for electron-neutral interactions. The excited electronic levels radiate state-dependent photons with wavelengths from the extreme ultraviolet (EUV) to visible regimes. Photon wavelengths are chosen according to a Voigt distribution accounting for the natural, pressure, and Doppler broadened linewidths. This method allows for reconstruction of the emission spectrum for a non-thermalized electron energy distribution function (EEDF) and investigation of high energy photon effects on surfaces, specifically photoemission. A parallel plate discharge with a fixed field (i.e. space charge neglected) is used to investigate the effects of including photoemission for a Townsend discharge. When operating at a voltage near the self-sustaining discharge threshold, it is observed that the electron current into the anode is higher when including photoemission from the cathode than without even when accounting for self-absorption from ground state atoms. As a result, the photocurrent has been observed to account for as much as 20% of the total current from the cathode under steady-state conditions.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1340276
Alternate ID(s):
OSTI ID: 1339005
Report Number(s):
SAND--2016-11833J; 649379
Journal Information:
Journal of Physics. D, Applied Physics, Journal Name: Journal of Physics. D, Applied Physics Journal Issue: 6 Vol. 50; ISSN 0022-3727
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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  • Moore, Chris H.; Hopkins, Matthew M.; Crozier, Paul S.
  • 28TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS 2012, AIP Conference Proceedings https://doi.org/10.1063/1.4769601
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Effects of excitation voltage pulse shape on the characteristics of atmospheric-pressure nanosecond discharges text January 2019