Evidence for Trivelpiece-Gould modes in a helicon discharge.
The high ionization efficiency of helicon discharges has been attributed to Landau damping and mode coupling to Trivelpiece-Gould (TG) modes. Though theory predicts the importance of TG modes, they have rarely been seen. Here they were detected directly by measuring their radiofrequency current with a J-dot probe, thus supporting the contention that TG modes play a role in these enigmatic plasma sources.
Blackwell
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Electrical Engineering Department, University of California, Los Angeles, California 90095-1594, USA.
Madziwa
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Arnush
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Chen
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