Nonlinear Saturation of Whistler Modes Driven by Runaway Electrons
Abstract
Runaway electrons exhibit kinetic instabilities with potentially beneficial consequences. The anomalous Doppler resonance between the electrons and whistler modes is a primary underlying mechanism. These instabilities require a first-principle nonlinear theoretical analysis, which would ultimately enable assessment of their impact on disruption mitigation and diagnostics, especially in ITER-relevant conditions. This paper presents recent progress in developing the required theoretical framework for isolated nonlinear resonances. By employing the generic bump-on-tail model, we predict the wave saturation levels in both near-threshold and strongly driven regimes. Remarkably, for the waves of interest, the parallel component of the wave vector dictates the parallel momentum of the resonant particles. This feature, together with the expected wave saturation level, provides a complete description of the resonance impact on the runaway electron distribution function. We show that the parametric dependence of the nonlinearly saturated mode provides a way to recover certain features of the runaway momentum distribution function.
- Authors:
- Publication Date:
- Research Org.:
- Institute for Fusion Studies, The University of Texas at Austin
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1991970
- Grant/Contract Number:
- SC0016283; FG02-04ER54742
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 30; Journal Issue: 8; Journal ID: ISSN 1070--664X
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Breizman, Boris, and Kiramov, Dmirtii. Nonlinear Saturation of Whistler Modes Driven by Runaway Electrons. United States: N. p., 2023.
Web. doi:10.1063/5.0159682.
Breizman, Boris, & Kiramov, Dmirtii. Nonlinear Saturation of Whistler Modes Driven by Runaway Electrons. United States. https://doi.org/10.1063/5.0159682
Breizman, Boris, and Kiramov, Dmirtii. Sun .
"Nonlinear Saturation of Whistler Modes Driven by Runaway Electrons". United States. https://doi.org/10.1063/5.0159682. https://www.osti.gov/servlets/purl/1991970.
@article{osti_1991970,
title = {Nonlinear Saturation of Whistler Modes Driven by Runaway Electrons},
author = {Breizman, Boris and Kiramov, Dmirtii},
abstractNote = {Runaway electrons exhibit kinetic instabilities with potentially beneficial consequences. The anomalous Doppler resonance between the electrons and whistler modes is a primary underlying mechanism. These instabilities require a first-principle nonlinear theoretical analysis, which would ultimately enable assessment of their impact on disruption mitigation and diagnostics, especially in ITER-relevant conditions. This paper presents recent progress in developing the required theoretical framework for isolated nonlinear resonances. By employing the generic bump-on-tail model, we predict the wave saturation levels in both near-threshold and strongly driven regimes. Remarkably, for the waves of interest, the parallel component of the wave vector dictates the parallel momentum of the resonant particles. This feature, together with the expected wave saturation level, provides a complete description of the resonance impact on the runaway electron distribution function. We show that the parametric dependence of the nonlinearly saturated mode provides a way to recover certain features of the runaway momentum distribution function.},
doi = {10.1063/5.0159682},
journal = {Physics of Plasmas},
number = 8,
volume = 30,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2023},
month = {Sun Jan 01 00:00:00 EST 2023}
}
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