Phase coherence of parametric-decay modes during high-harmonic fast-wave heating in the National Spherical Torus Experiment

Carlsson, J. A.; Wilson, J. R.; Hosea, J. C.; Greenough, N. L.; Perkins, R. J.

doi:10.1063/1.4954825

Title: Phase coherence of parametric-decay modes during high-harmonic fast-wave heating in the National Spherical Torus Experiment

Journal Article · Thu Jun 30 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4954825· OSTI ID:1420653

;

; Hosea, J. C.; Greenough, N. L.;

Third-order spectral analysis, in particular, the auto bicoherence, was applied to probe signals from high-harmonic fast-wave heating experiments in the National Spherical Torus Experiment. Strong evidence was found for parametric decay of the 30 MHz radio-frequency (RF) pump wave, with a low-frequency daughter wave at 2.7 MHz, the local majority-ion cyclotron frequency. The primary decay modes have auto bicoherence values around 0.85, very close to the theoretical value of one, which corresponds to total phase coherence with the pump wave. The threshold RF pump power for onset of parametric decay was found to be between 200 kW and 400 kW.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: Subcontract S014474-U

OSTI ID:: 1420653

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Vol. 23 Journal Issue: 6; ISSN 1070-664X

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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