Title :
Microwave resonant-cavity-produced air discharges
Author :
Passow, Michael L. ; Brake, Mary L. ; Lopez, Patricia ; McColl, William B. ; Repetti, Thomas E.
Author_Institution :
Dept. of Nucl. Eng., Michigan Univ., Ann Arbor, MI, USA
fDate :
4/1/1991 12:00:00 AM
Abstract :
Air discharges produced in an Asmussen microwave cavity (0-300 W, 2.45 GHz, CW) between 0.5 and 100 torr were investigated. Gas temperatures (1000-2500 K) were estimated from rotational temperatures obtained from optical emission spectroscopy (OES). These agreed with a simple model of the heat transfer of the gas where joule heating was included as the source term. Vibrational temperatures (3700-7300 K) were also determined from OES and followed the electron energy trends. Electron density (1011-1013 cm-3), collisional frequency (1011-1012 s-1), and plasma conductivity (0.09-0.3 (Ω-m)-1) were calculated from a self-consistent electromagnetic model of the cavity where the plasma was assumed to be a lossy dielectric. Absorbed power, electric, and optical probe measurements were used as the input parameters to the model
Keywords :
discharges (electric); plasma density; plasma diagnostics; plasma simulation; plasma temperature; plasma transport processes; 0 to 300 W; 0.5 to 100 torr; 1000 to 2500 K; 2.45 GHz; absorbed power measurement; collisional frequency; electric probe measurement; electron density; gas temperatures; heat transfer; lossy dielectric; microwave resonant-cavity-produced air discharges; model; optical emission spectroscopy; optical probe measurements; plasma conductivity; rotational temperatures; self-consistent electromagnetic model; vibrational temperatures; Dielectric losses; Electromagnetic heating; Electron optics; Frequency; Heat transfer; Plasma measurements; Plasma temperature; Resonance; Spectroscopy; Stimulated emission;
Journal_Title :
Plasma Science, IEEE Transactions on
