Drift waves in a high-density cylindrical helicon discharge
- Max-Planck-Institut fuer Plasmaphysik, Teilinstitut Greifswald (Germany)
A low-frequency instability is investigated in a helicon plasma, which is characterized by comparably high plasma-{beta} and high collision frequencies. Single movable Langmuir probes and a poloidal probe array are used for studies of spatiotemporal dynamics and for characterization of the background plasma parameters. All experimentally observed features of the instability are found to be consistent with drift waves. A linear nonlocal numerical model for drift modes, based on the two-fluid description of a plasma, is used for comparison between the experimental observations and theory. Comparing numerical and experimental frequencies, it is found that the experimentally observed frequencies are consistent with drift waves. The numerical results show that the high electron collision frequencies provide the strongest destabilization mechanism in the helicon plasma.
- OSTI ID:
- 20736485
- Journal Information:
- Physics of Plasmas, Vol. 12, Issue 4; Other Information: DOI: 10.1063/1.1864076; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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