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

A Fierro, C Moore, B Scheiner, BT Yee… - Journal of Physics D …, 2017 - iopscience.iop.org
A Fierro, C Moore, B Scheiner, BT Yee, MM Hopkins
Journal of Physics D: Applied Physics, 2017iopscience.iop.org
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 …
Abstract
A kinetic description for electronic excitation of helium for principal quantum number n 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 (ie 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. The photocurrent has been observed to account for as much as 20% of the total current from the cathode under steady-state conditions.
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