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

Abstract

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.

Authors:
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  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
DOE Contract Number:  
AC02-09CH11466
Product Type:
Dataset
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Bicoherence Third order spectral analysis PDI HHFW NSTX
Keywords:
Bicoherence Third order spectral analysis PDI HHFW NSTX
OSTI Identifier:
1366987
DOI:
10.11578/1366987

Citation Formats

Carlsson, J., Wilson, J.R., Horsea, J., Greenough, N., and Perkins, R. Phase coherence of parametric-decay modes during high-harmonic fast-wave heating in the National Spherical Torus Experiment. United States: N. p., 2016. Web. doi:10.11578/1366987.
Carlsson, J., Wilson, J.R., Horsea, J., Greenough, N., & Perkins, R. Phase coherence of parametric-decay modes during high-harmonic fast-wave heating in the National Spherical Torus Experiment. United States. doi:10.11578/1366987.
Carlsson, J., Wilson, J.R., Horsea, J., Greenough, N., and Perkins, R. 2016. "Phase coherence of parametric-decay modes during high-harmonic fast-wave heating in the National Spherical Torus Experiment". United States. doi:10.11578/1366987. https://www.osti.gov/servlets/purl/1366987. Pub date:Wed Jun 01 00:00:00 EDT 2016
@article{osti_1366987,
title = {Phase coherence of parametric-decay modes during high-harmonic fast-wave heating in the National Spherical Torus Experiment},
author = {Carlsson, J. and Wilson, J.R. and Horsea, J. and Greenough, N. and Perkins, R.},
abstractNote = {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.},
doi = {10.11578/1366987},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2016},
month = {6}
}

Dataset:

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Works referenced in this record:

Phase coherence of parametric-decay modes during high-harmonic fast-wave heating in the National Spherical Torus Experiment
journal, June 2016

  • Carlsson, J. A.; Wilson, J. R.; Hosea, J. C.
  • Physics of Plasmas, Vol. 23, Issue 6
  • DOI: 10.1063/1.4954825

    Works referencing / citing this record:

    Phase coherence of parametric-decay modes during high-harmonic fast-wave heating in the National Spherical Torus Experiment
    journal, June 2016

    • Carlsson, J. A.; Wilson, J. R.; Hosea, J. C.
    • Physics of Plasmas, Vol. 23, Issue 6
    • DOI: 10.1063/1.4954825

    Phase coherence of parametric-decay modes during high-harmonic fast-wave heating in the National Spherical Torus Experiment
    journal, June 2016

    • Carlsson, J. A.; Wilson, J. R.; Hosea, J. C.
    • Physics of Plasmas, Vol. 23, Issue 6
    • DOI: 10.1063/1.4954825