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Title: Analysis of Alfven eigenmode destabilization in ITER using a Landau closure model

Abstract

Alfvén eigenmodes (AE) can be destabilized during ITER discharges driven by neutral beam injection (NBI) energetic particles (EP) and alpha particles. The aim of the present study is to analyze the AE stability of different ITER operation scenarios considering multiple energetic particle species. We use the reduced magneto-hydrodynamic (MHD) equations to describe the linear evolution of the poloidal flux and the toroidal component of the vorticity in a full 3D system, coupled with equations of density and parallel velocity moments for the EP species including the effect of the acoustic modes. Furthermore, the AEs driven by the NBI EP and alpha particles are stable in the configurations analyzed, only MHD-like modes with large toroidal couplings are unstable, although both can be destabilized if the EP increases above a threshold. The threshold is two times the model value for the NBI EP and alpha particles in the reverse shear (RS) case, leading to the destabilization of Beta induced AE (BAE) near the magnetic axis with a frequency of kHz and toroidal or elliptical AE (TAE/EAE) in the RS region with a frequency of kHz, respectively. On the other hand, the hybrid and steady state configurations show a threshold 3 times largermore » with respect to the model for the alpha particle and 40 times for the NBI EP, also destabilizing BAE and TAE between the inner and middle plasma region. In addition, a extended analysis of the RS scenario where the of both alpha particles and NBI EP are above the AE threshold, multiple EP damping effects are also identified as well as optimization trends regarding the resonance properties of the alpha particle and NBI EP with the bulk plasma.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]
  1. National Inst. of Natural Science, Toki (Japan). National Inst. for Fusion Science; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. Carlos III de Madrid (Spain)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); MINECO
OSTI Identifier:
1810014
Grant/Contract Number:  
AC05-00OR22725; FC02-04ER54698; ENE2015-68265-P
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 59; Journal Issue: 7; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Varela, J., Spong, D. A., and Garcia, L.. Analysis of Alfven eigenmode destabilization in ITER using a Landau closure model. United States: N. p., 2019. Web. https://doi.org/10.1088/1741-4326/ab1ebe.
Varela, J., Spong, D. A., & Garcia, L.. Analysis of Alfven eigenmode destabilization in ITER using a Landau closure model. United States. https://doi.org/10.1088/1741-4326/ab1ebe
Varela, J., Spong, D. A., and Garcia, L.. Tue . "Analysis of Alfven eigenmode destabilization in ITER using a Landau closure model". United States. https://doi.org/10.1088/1741-4326/ab1ebe. https://www.osti.gov/servlets/purl/1810014.
@article{osti_1810014,
title = {Analysis of Alfven eigenmode destabilization in ITER using a Landau closure model},
author = {Varela, J. and Spong, D. A. and Garcia, L.},
abstractNote = {Alfvén eigenmodes (AE) can be destabilized during ITER discharges driven by neutral beam injection (NBI) energetic particles (EP) and alpha particles. The aim of the present study is to analyze the AE stability of different ITER operation scenarios considering multiple energetic particle species. We use the reduced magneto-hydrodynamic (MHD) equations to describe the linear evolution of the poloidal flux and the toroidal component of the vorticity in a full 3D system, coupled with equations of density and parallel velocity moments for the EP species including the effect of the acoustic modes. Furthermore, the AEs driven by the NBI EP and alpha particles are stable in the configurations analyzed, only MHD-like modes with large toroidal couplings are unstable, although both can be destabilized if the EP increases above a threshold. The threshold is two times the model value for the NBI EP and alpha particles in the reverse shear (RS) case, leading to the destabilization of Beta induced AE (BAE) near the magnetic axis with a frequency of kHz and toroidal or elliptical AE (TAE/EAE) in the RS region with a frequency of kHz, respectively. On the other hand, the hybrid and steady state configurations show a threshold 3 times larger with respect to the model for the alpha particle and 40 times for the NBI EP, also destabilizing BAE and TAE between the inner and middle plasma region. In addition, a extended analysis of the RS scenario where the of both alpha particles and NBI EP are above the AE threshold, multiple EP damping effects are also identified as well as optimization trends regarding the resonance properties of the alpha particle and NBI EP with the bulk plasma.},
doi = {10.1088/1741-4326/ab1ebe},
journal = {Nuclear Fusion},
number = 7,
volume = 59,
place = {United States},
year = {2019},
month = {6}
}

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