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Title: Spectroscopic determination of kinetic parameters for frequency sweeping Alfven eigenmodes

Abstract

A method for analyzing fundamental kinetic plasma parameters, such as linear drive and external damping rate, based on experimental observations of chirping Alfven eigenmodes, is presented. The method, which relies on new semiempirical laws for nonlinear chirping characteristics, consists of fitting procedures between the so-called Berk-Breizman model and the experiment in a quasiperiodic chirping regime. This approach is applied to the toroidicity induced Alfven eigenmode (TAE) on JT-60 Upgrade (JT-60U) [N. Oyama et al., Nucl. Fusion 49, 104007 (2009)], which yields an estimation of the kinetic parameters and suggests the existence of TAEs far from marginal stability. Two collision models are considered, and it is shown that dynamical friction and velocity-space diffusion are essential to reproduce nonlinear features observed in experiments. The results are validated by recovering measured growth and decay of perturbation amplitude and by estimating collision frequencies from experimental equilibrium data.

Authors:
 [1];  [1];  [2];  [3]
  1. Japan Atomic Energy Agency, Higashi-Ueno 6-9-3, Taitou, Tokyo 110-0015 (Japan)
  2. Japan Atomic Energy Agency, Mukouyama 801-1, Naka, Ibaraki 311-0193 (Japan)
  3. IRFM, Commissariat a l'Energie Atomique, F-13108 Saint Paul Lez Durance (France)
Publication Date:
OSTI Identifier:
21532079
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 17; Journal Issue: 12; Other Information: DOI: 10.1063/1.3500224; (c) 2010 American Institute of Physics; Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALFVEN WAVES; COLLISIONS; JT-60U TOKAMAK; NONLINEAR PROBLEMS; PLASMA; PLASMA DIAGNOSTICS; PLASMA INSTABILITY; PLASMA SIMULATION; CLOSED PLASMA DEVICES; HYDROMAGNETIC WAVES; INSTABILITY; SIMULATION; THERMONUCLEAR DEVICES; TOKAMAK DEVICES

Citation Formats

Lesur, M, IRFM, Commissariat a l'Energie Atomique, F-13108 Saint Paul Lez Durance, Idomura, Y, Shinohara, K, and Garbet, X. Spectroscopic determination of kinetic parameters for frequency sweeping Alfven eigenmodes. United States: N. p., 2010. Web. doi:10.1063/1.3500224.
Lesur, M, IRFM, Commissariat a l'Energie Atomique, F-13108 Saint Paul Lez Durance, Idomura, Y, Shinohara, K, & Garbet, X. Spectroscopic determination of kinetic parameters for frequency sweeping Alfven eigenmodes. United States. https://doi.org/10.1063/1.3500224
Lesur, M, IRFM, Commissariat a l'Energie Atomique, F-13108 Saint Paul Lez Durance, Idomura, Y, Shinohara, K, and Garbet, X. 2010. "Spectroscopic determination of kinetic parameters for frequency sweeping Alfven eigenmodes". United States. https://doi.org/10.1063/1.3500224.
@article{osti_21532079,
title = {Spectroscopic determination of kinetic parameters for frequency sweeping Alfven eigenmodes},
author = {Lesur, M and IRFM, Commissariat a l'Energie Atomique, F-13108 Saint Paul Lez Durance and Idomura, Y and Shinohara, K and Garbet, X},
abstractNote = {A method for analyzing fundamental kinetic plasma parameters, such as linear drive and external damping rate, based on experimental observations of chirping Alfven eigenmodes, is presented. The method, which relies on new semiempirical laws for nonlinear chirping characteristics, consists of fitting procedures between the so-called Berk-Breizman model and the experiment in a quasiperiodic chirping regime. This approach is applied to the toroidicity induced Alfven eigenmode (TAE) on JT-60 Upgrade (JT-60U) [N. Oyama et al., Nucl. Fusion 49, 104007 (2009)], which yields an estimation of the kinetic parameters and suggests the existence of TAEs far from marginal stability. Two collision models are considered, and it is shown that dynamical friction and velocity-space diffusion are essential to reproduce nonlinear features observed in experiments. The results are validated by recovering measured growth and decay of perturbation amplitude and by estimating collision frequencies from experimental equilibrium data.},
doi = {10.1063/1.3500224},
url = {https://www.osti.gov/biblio/21532079}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 12,
volume = 17,
place = {United States},
year = {Wed Dec 15 00:00:00 EST 2010},
month = {Wed Dec 15 00:00:00 EST 2010}
}