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.
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1420653
- Grant/Contract Number:
- Subcontract S014474-U
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Name: Physics of Plasmas Journal Volume: 23 Journal Issue: 6; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Carlsson, J. A., Wilson, J. R., Hosea, J. C., Greenough, N. L., and Perkins, R. J. 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:10.1063/1.4954825.
Carlsson, J. A., Wilson, J. R., Hosea, J. C., Greenough, N. L., & Perkins, R. J. Phase coherence of parametric-decay modes during high-harmonic fast-wave heating in the National Spherical Torus Experiment. United States. https://doi.org/10.1063/1.4954825
Carlsson, J. A., Wilson, J. R., Hosea, J. C., Greenough, N. L., and Perkins, R. J. Thu .
"Phase coherence of parametric-decay modes during high-harmonic fast-wave heating in the National Spherical Torus Experiment". United States. https://doi.org/10.1063/1.4954825.
@article{osti_1420653,
title = {Phase coherence of parametric-decay modes during high-harmonic fast-wave heating in the National Spherical Torus Experiment},
author = {Carlsson, J. A. and Wilson, J. R. and Hosea, J. C. and Greenough, N. L. and Perkins, R. J.},
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 = {10.1063/1.4954825},
journal = {Physics of Plasmas},
number = 6,
volume = 23,
place = {United States},
year = {Thu Jun 30 00:00:00 EDT 2016},
month = {Thu Jun 30 00:00:00 EDT 2016}
}
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