Plasma and Fusion Research
Online ISSN : 1880-6821
ISSN-L : 1880-6821
Regular Articles
Overdense Microwave Plasma Generation in a Negative-Permeability Space
Osamu SAKAISatoshi IIOYoshihiro NAKAMURA
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2013 Volume 8 Pages 1406167


High-power electromagnetic waves propagating in a negative-permeability space were investigated theoretically and experimentally, and they generated overdense plasmas successfully. Theoretical analysis predicted that high-density plasmas with negative permittivity can form via saddle-node bifurcations within an adequate electric field. To confirm theoretical predictions, using metamaterials with negative permeability achieved by magnetic resonances, we injected microwaves with several hundreds of watt into a waveguide filled with a low-pressure discharge gas. Langmuir probe measurement revealed that a generated plasma is well beyond the cutoff density for the wave frequency of 2.45 GHz, and indicated transition between positive-permittivity (low-electron-density) and negative-permittivity (overdense) states.

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© 2013 by The Japan Society of Plasma Science and Nuclear Fusion Research
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