Accession Number : AD0855851

Title :   Waves of Ionization in Low Pressure Molecular Gas Discharges.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s) : Newton, Philip L.

Report Date : MAY 1969

Pagination or Media Count : 89

Abstract : The dispersion of waves of ionization were studied in nitrogen and in carbon dioxide. The waves were excited by current modulation and the dispersion recorded using a time-space display method. In N2 and in CO2 the ionization waves were cathode to anode forward waves. Their dispersion is presented as a function of the gas pressure and of the discharge currents. The waves with finite group velocity were always attenuated in the pressure range studied (0.3 to 5 torr) but standing striations were obtained at the lower pressures without current modulation. However in the mixture N2-CO2, the discharge was very unstable and showed a broad-band spectrum of low frequency oscillations. These self-excited oscillations did not permit time-sampling diagnostics. A 0 to 100 kHz digital correlator was applied to determine the characteristics of these apparently random ionization waves. Results of this experiment are presented. (Author)

Descriptors :   (*GAS DISCHARGES, WAVE PROPAGATION), GAS IONIZATION, NITROGEN, CARBON DIOXIDE, DISPERSION RELATIONS, CORRELATORS, THESES.

Subject Categories : Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE