Resonant wave-filament interactions as a loss mechanism for HHFW heating and current drive

W. Tierens, J. R. Myra, R. Bilato, L. Colas

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Perkins et al (2012 Phys. Rev. Lett. 109 045001) reported unexpected power losses during high harmonic fast wave (HHFW) heating and current drive in the National Spherical Torus Experiment (NSTX). Recently, Tierens et al (2020 Phys. Plasmas 27 010702) proposed that these losses may be attributable to surface waves on field-aligned plasma filaments, which carry power along the filaments, to be lost at the endpoints where the filaments intersect the limiters. In this work, we show that there is indeed a resonant loss mechanism associated with the excitation of these surface waves, and derive an analytic expression for the power lost to surface wave modes at each filament.

Original languageEnglish
Article number035001
JournalPlasma Physics and Controlled Fusion
Volume64
Issue number3
DOIs
StatePublished - Mar 2022
Externally publishedYes

Funding

FundersFunder number
Horizon 2020 Framework Programme633053

    Keywords

    • HHFW
    • mode conversion
    • wave-filament

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