Charge dependence of the plasma travel length in atmospheric-pressure plasma

Abstract

Plasma plume is generated using a quartz tube, helium gas, and foil electrode by applying AC high voltage under the atmosphere. The plasma plume is released into the atmosphere from inside of the quartz tube and is seen as the continuous movement of the plasma bullet. The travel length of plasma bullet is defined from plasma energy and force due to electric field. The drift velocity of plasma bullet has the upper limit under atmospheric-pressure because the drift velocity is determined from the balance between electric field and resistive force due to collisions between plasma and air. The plasma plume charge depends on the drift velocity. Consequently, in the laminar flow of helium gas flow state, the travel length of the plasma plume logarithmically depends on the plasma plume charge which changes with both the electric field and the resistive force.

Excitation Wavelength and Temperature at Irradiation of Metal by Atmospheric-Pressure Nonequilibrium Argon Plasma

“…[17][18][19] Consequently, the travel length of the plasma depends on plasma jet charge that changes air. [20][21][22][23] Plasma parameters (density and temperature) change with operation conditions, but with typical parameters, atmospheric-pressure nonequilibrium (cold) plasma can have a wide-ranging density of 10 17 -10 20 m -3 , and its temperature can be a few electron volts. 5,6,19,[24][25][26] Plasma intermittently generated by AC power supply is in a nonthermal equilibrium state.…”