Determination of Magnetic Pressure in A D.C Electric Arc In the Schottky Theory
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Abstract
The magnetic pressure, plasma pressure and the ratio between them which represent the beta (b) have been determined in a D.C electric arc discharge for current values (3.5-24A) under argon gas pressure ranged from (0.1-50torr). The obtained electron density and temperature from the double probes characteristic were used to calculate the magnetic and plasma pressure as well as the beta. The electron temperature explicit relation of product of gas pressure and radius of discharge arc that holds in schottky limit is used to determine the later parameter. The results show that the magnetic pressure varies nearly exponentially with gas pressure while it increases as a function of square value of arc current in agreement with the theoretical magnetic pressure. Plasma pressure and the beta plasma decreases exponentially with both arc current and gas pressure due to decreasing electron temperature.
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