Langmuir probe characterization of low-frequency oscillations in a radio-frequency SF6 plasma

Anders Barlow, Alec Deslandes, Jamie Quinton

    Research output: Contribution to journalArticlepeer-review

    Abstract

    A low-frequency oscillation (<100 Hz) has been observed in a low-pressure (1-50 mTorr) radio-frequency (RF) inductively coupled plasma, produced in sulfur hexafluoride. Langmuir probe studies have characterized this oscillation with respect to RF power, gas pressure and probe proximity to the antenna. The experimental parameter space within which this oscillation is observed is mapped with respect to power and pressure for the reaction chamber in use. The oscillation is observed in Langmuir probe currents for positive probe bias, and has a strong dependence on experimental conditions, as well as probe position within the chamber. The propagation speed of the instability away from the source is found to be 16 m s-1.

    Original languageEnglish
    Article number065011
    Pages (from-to)065011-1-065011-7
    Number of pages7
    JournalPlasma Sources Science and Technology
    Volume20
    Issue number6
    DOIs
    Publication statusPublished - Dec 2011

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