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  • Cascades of parametric instabilities in the tokamak plasma edge during electron cyclotron resonance heating
    Clod Pedersen, Asbjørn ...
    We report observations of nonlinear two-plasmon decay instabilities (TPDIs) of a high-power microwave beam, a process similar to half-harmonic generation in optics, during electron cyclotron ... resonance heating in a tokamak. TPDIs are found to occur regularly in the plasma edge due to wave trapping in density fluctuations for various confinement modes, and the frequencies of both observed daughter waves agree with modeling. Emissions from a cascade of subsequent decays, which indicate a generation of ion Bernstein waves, are correlated with fast-ion generation. This emphasizes the limitations of standard linear microwave propagation models and possibly paves the way for novel microwave applications in plasmas.
    Source: Physical review letters. - ISSN 0031-9007 (Vol. 132, iss. 13, [article no.] 135101, 29. mar. 2024, str. 135101-1-135101-6)
    Type of material - article, component part ; adult, serious
    Publish date - 2024
    Language - english
    COBISS.SI-ID - 197113091

    Link(s):

    https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.132.135101
    DOI

source: Physical review letters. - ISSN 0031-9007 (Vol. 132, iss. 13, [article no.] 135101, 29. mar. 2024, str. 135101-1-135101-6)
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