Title :
Sheath-wave-related resonances in the frequency response of a cylindrical monopole in a plasma
Author :
Nachman, Manfred ; Le Blanc, Mario ; Linh, Ngo Phong
Author_Institution :
Dept. of Electr. Eng., Ecole Polytech. of Montreal, Que., Canada
fDate :
6/1/1988 12:00:00 AM
Abstract :
Reference is made to a floating or negatively biased antenna immersed in a plasma that is surrounded by an ion sheath. Such an antenna-sheath-plasma system may support slow surface waves at driving frequencies below the electron plasma frequency. Resonances associated with these so-called sheath waves are observed at certain frequencies in the antenna´s response to an applied sinusoidal signal. An experimental study of these resonances is presented for a short cylindrical monopole in a low-pressure isotropic argon plasma. The effect on the resonance frequencies of a DC bias applied to the antenna and of plasma density and antenna length was investigated. From the experimental data, the relationship between sheath thickness and antenna potential, and the frequency dependence of the antenna admittance could be derived
Keywords :
plasma filled waveguides; plasma sheaths; plasma waves; Ar; DC bias; admittance; antenna-sheath-plasma system; cylindrical monopole; driving frequencies; electron plasma frequency; frequency response; ion sheath; low pressure isotropic Ar plasma; negatively biased antenna; plasma; potential; sinusoidal signal; slow surface waves; thickness; Argon; Electrons; Frequency dependence; Frequency response; Plasma density; Plasma sheaths; Plasma waves; Resonance; Resonant frequency; Surface waves;
Journal_Title :
Plasma Science, IEEE Transactions on
