Investigation of impurity radiation from a well diganosed, laser heated plasma sample. Final report Page: 36 of 56
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SECTION IV
THEORETICAL SUPPORT
The effects of modifying the preionization circuit with
varistor damping have been estimated using a simple homogeneous
Ohmic-heating model. Radial heat losses by heat conduction and
charge exchange with neutral particles have also been estimated.
These calculations are described in detail below. In addition,
axial laser heating calculations for the present. experimental con-
ditons, with and without carbon line radiation losses, have been
completed and are presently being analyzed.
4.1. Preionization Discharge
A simple zero-dimensional model of an axial preionization dis-
charge in hydrogen gas was developed under the previous LLL contract.
This section reports recent c calculations using this model with revised
energy losses and varistor circuit damping. It is shown that the use
of a single high current pulse with minimal backswing may make a sig-
nificant change in the preionization conditions, increasing the
average electron density by 35 percent.
Energy losses. The details of the three-fluid model have been
described in a previous report.1 The model describes the energy balance
for Ohmic heating and ionization of a homogeneous hydrogen plasma containing
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Crawford, E.; Quimby, D.; Hoffman, A. & Pietrzyk, Z.A. Investigation of impurity radiation from a well diganosed, laser heated plasma sample. Final report, report, November 1, 1977; United States. (https://digital.library.unt.edu/ark:/67531/metadc1055537/m1/36/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.