Abstract
The application of a magnetic field transverse to the electric field in an ionized gas causes a shift in the electron energy distribution towards lower energies. This shift affects the transport and rate coefficients, and consequently the resistivity of the ionized gas. This effect could be utilized to modify the resistance of glow discharges and to use them for high power switching. In order to model the positive column of glow discharges in He/SF6 gas mixtures, Monte-Carlo codes were used to determine the rate and transport coefficients. With the obtained values the current density - electric field characteristics of the positive column were computed. Besides steady state characteristics, the transient dynamic response of the discharge due to changes of the transverse magnetic field was studied. To investigate glow discharges in magnetic fields experimentally, a coaxial discharge system was used which allows application of axial magnetic fields up to 1.2 Tesla. Measurements of the discharge voltage and current in a 80% He/20% SF6 mixture at a pressure of 8 torr were performed at varying magnetic field intensities. The discharge voltage was found to increase with increasing magnetic field as predicted by our model.
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