Accession Number : AD0256216

Title :   IONIZATION IN AN ELECTRODELESS DISCHARGE

Corporate Author : PLASMADYNE CORP SANTA ANA CALIF

Personal Author(s) : TREAT,RICHARD P.

Report Date : 15 MAR 1961

Pagination or Media Count : 1

Abstract : An analytical study was made of the ionization occurring in a weakly pre-ionized molecular hydrogen gas. The configuration studied consists of a long cylindrical gas column subjected to a strong, fast rising axial magnetic field which is initially zero. The investigation shows that in practice it is possible to obtain a l rge number of ionization collisions in a time t sub m during which the plasma mass motion and the magnetic field are negligible. For this time interval, if electron losses are neglected, the increase in ionization fraction depends only on the voltage induced around the discharge tube and on the ratio of the circumference of the tube to the electron mean free path. Quantitative order of magnitude results are given for this relation. For a fixed voltage around the discharge tube, maximum ionization during the mass motion time t sub m occurs if the energy gained by an electron in a free path is about equal to the threshold energy for ionization. (Author)

Descriptors :   *GAS IONIZATION, *IONIZATION, *MAGNETOHYDRODYNAMICS, DENSITY, DISCHARGE TUBES, ELECTRIC DISCHARGES, ELECTRIC FIELDS, ELECTROMAGNETIC FIELDS, ELECTRONS, GAS DISCHARGES, HYDROGEN, MAGNETIC FIELDS, MATHEMATICAL ANALYSIS, PARTIAL DIFFERENTIAL EQUATIONS, PLASMAS(PHYSICS)

Distribution Statement : APPROVED FOR PUBLIC RELEASE