Accession Number:

ADA156296

Title:

Analysis of Non-Equilibrium Excitation in Pulsed Electric Discharges.

Descriptive Note:

Final rept. Jun 82-Sep 84,

Corporate Author:

GTE LABS INC WALTHAM MA

Personal Author(s):

Report Date:

1985-04-25

Pagination or Media Count:

87.0

Abstract:

A numerical solution of the time-dependent Boltzmann equation has been tested with model calculations. Some comparisons were made with nitrogen cross-sections. The model calculation are relatively fast and much easier to analyze. The electrons lose memory of their initial conditions for times greater than the energy exchange time. This relaxation time can vary orders of magnitude depending on the gas composition and the ratio of the applied field to the total gas density EN. The limits on the applicability of the local field approximation have been explored. It is found that it is a valid parameter for coefficients in the electron continuity equation provided EN does not change within a few energy exchange times. Several attempts have been made to find a parameterization of the time-dependent transport and rate coefficients, or to formulate a hydrodynamic-like model for time-dependent fields. Previous effort to describe, for example, the ionization rate in the nonuniform field region of a discharge, have been examined for application in the time-dependent case. H The electron continuity equation only requires information on the electron density growth or decay constants and electron flux. The moments which are most sensitive to thils component are not usually included in models of gas discharges. Keywords Electron Distribution function Time-dependent Boltzmann equation Ionization rate Model cross-section.

Subject Categories:

  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE