Collisional enhancement of energetic particle Alfvénic resonance width in tokamaks
Abstract
The phase-space structure of resonances between fast ions and an Alfvénic mode and the associated modification of density profiles in tokamaks are studied as a function of particle collisions. Guiding-center simulations in a realistic tokamak equilibrium are employed to address the resonance broadening parametric dependencies with respect to changes in the pitch-angle scattering rate. The rate of collisional replenishment, along with resonance strength, given by the combination of eigenmode and resonance structures and equilibrium parameters, determines saturation amplitudes for a given damping rate. As seen from the distribution function flattening, collisions have an effect of broadening the resonances, while the absolute value of δf decreases with increasing collisionality. It is observed that the collisional broadening can be comparable to the collisionless resonance width due to the mode amplitude alone. The resonance broadening coefficients are compared with the existing theory based on analytically expected saturation levels, showing fair agreement. Furthermore the results can be useful in assisting reduced kinetic models, such as quasilinear models, when prescribing the effective resonance phase-space width, i.e., the mode-particle interaction platform, due to collisional or turbulent processes.
- Authors:
-
[1];
[1];
[1];
[2]
- Princeton Univ., Princeton, NJ (United States). Princeton Plasma Physics Lab
- Max Planck Institute for Plasma Physics, Garching (Germany)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1503325
- Alternate Identifier(s):
- OSTI ID: 1501956
- Grant/Contract Number:
- AC02-09CH11466
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 26; Journal Issue: 3; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
White, R. B., Duarte, V. N., Gorelenkov, N. N., and Meng, G. Collisional enhancement of energetic particle Alfvénic resonance width in tokamaks. United States: N. p., 2019.
Web. doi:10.1063/1.5088598.
White, R. B., Duarte, V. N., Gorelenkov, N. N., & Meng, G. Collisional enhancement of energetic particle Alfvénic resonance width in tokamaks. United States. https://doi.org/10.1063/1.5088598
White, R. B., Duarte, V. N., Gorelenkov, N. N., and Meng, G. Wed .
"Collisional enhancement of energetic particle Alfvénic resonance width in tokamaks". United States. https://doi.org/10.1063/1.5088598. https://www.osti.gov/servlets/purl/1503325.
@article{osti_1503325,
title = {Collisional enhancement of energetic particle Alfvénic resonance width in tokamaks},
author = {White, R. B. and Duarte, V. N. and Gorelenkov, N. N. and Meng, G.},
abstractNote = {The phase-space structure of resonances between fast ions and an Alfvénic mode and the associated modification of density profiles in tokamaks are studied as a function of particle collisions. Guiding-center simulations in a realistic tokamak equilibrium are employed to address the resonance broadening parametric dependencies with respect to changes in the pitch-angle scattering rate. The rate of collisional replenishment, along with resonance strength, given by the combination of eigenmode and resonance structures and equilibrium parameters, determines saturation amplitudes for a given damping rate. As seen from the distribution function flattening, collisions have an effect of broadening the resonances, while the absolute value of δf decreases with increasing collisionality. It is observed that the collisional broadening can be comparable to the collisionless resonance width due to the mode amplitude alone. The resonance broadening coefficients are compared with the existing theory based on analytically expected saturation levels, showing fair agreement. Furthermore the results can be useful in assisting reduced kinetic models, such as quasilinear models, when prescribing the effective resonance phase-space width, i.e., the mode-particle interaction platform, due to collisional or turbulent processes.},
doi = {10.1063/1.5088598},
journal = {Physics of Plasmas},
number = 3,
volume = 26,
place = {United States},
year = {Wed Mar 20 00:00:00 EDT 2019},
month = {Wed Mar 20 00:00:00 EDT 2019}
}
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Works referencing / citing this record:
Verification and application of resonance broadened quasi-linear (RBQ) model with multiple Alfvénic instabilities
journal, July 2019
- Gorelenkov, N. N.; Duarte, V. N.; Collins, C. S.
- Physics of Plasmas, Vol. 26, Issue 7
A simple model for perturbative kinetic particle resonances in tokamaks
journal, April 2019
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Collisional resonance function in discrete-resonance quasilinear plasma systems
journal, December 2019
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