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INVESTIGATION OF A STEADY-STATE DISCHARGE IN ARGON AT HIGH CURRENT DENSITIES (UNTERSUCHUNG EINER STATIONAREN ARGONENTLADUNG BEI HOHEN STROMDICHTEN).
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
A discharge in argon under a pressure of 0.58 Torr and at current densities from 13.8 to 40.6 amdsq cm in the steady state was investigated, and the electron temperature and the charge carrier concentration were determined by a special sonde measurement process. The investigation was undertaken because the many published studies on the generation of high-temperature plasma do not deal with steady-state discharges, and because measurements on stationary high-current-density plasmas in the low-pressure region are known to have been made in only a few cases. The course of the electron temperature and the charge-carrier concentration values as a function of current strength and tube radius permits the assumption that electron pressure has a strong effect on the discharge. It appears, however, that the effect of the gas temperature outweighs this. The electron mobility is in good agreement with the theoretically calculated values. Investigations of the arc operating voltage, discharge current, and the radiation shows no instability of the discharge and no oscillation. At high current densities argon ion lines with relatively high excitation voltage and considerable intensity were produced. In this treatment ion collisions were not taken into account.
Trans. of Beitrage aus der Plasmaphysik v5 nl p59-74 1965.