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RF absorption and ion heating in helicon sources
J L Kline1, E E Scime, R F Boivin
1Department of Physics, West Virginia University, Morgantown, West Virginia 26505, USA.
Physical Review Letters
|May 15, 2002
Abstract:
Experimental data are presented that are consistent with the hypothesis that anomalous rf absorption in helicon sources is due to electron scattering arising from parametrically driven ion-acoustic waves downstream from the antenna. Also presented are ion temperature measurements demonstrating anisotropic heating (T( perpendicular)>T(parallel)) at the edge of the discharge. The most likely explanation is ion-Landau damping of electrostatic slow waves at a local lower-hybrid-frequency resonance.