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Title: Study of Alfven eigenmodes stability in plasma with multiple NBI driven energetic particle species

Abstract

The aim of this study is to analyze the destabilization of Alfven Eigenmodes (AEs) by multiple energetic particle (EP) species in DIII-D and LHD discharges. In this work, we use the reduced 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 energetic particle species, including the effect of the acoustic modes, diamagnetic currents, and helical couplings. Furthermore, we add the Landau damping and resonant destabilization effects using a closure relation. The simulations with multiple neutral beam injector (NBI) lines show three different regimes: the nondamped regime where the multibeam AE growth rate is larger compared to the growth rate of the AEs destabilized by the individual NBI lines, the interaction regime where the multibeam AE growth rate is smaller than the single NBI AEs, and the damped regime where the AEs are suppressed. Operations in the damped regime require EP species with different density profile flatness or gradient locations. In addition, the AE growth rate in the interaction regime is further reduced if the combined NBI lines have similar beam temperatures and the β ofmore » the NBI line with a flatter EP density profile increases. Additionally, optimization trends are identified in DIII-D high poloidal β and LHD low density/magnetic field discharges with multiple NBI lines as well as the configuration requirements to operate in the damped and interaction regimes. DIII-D simulations show a decrease in the n = 2 to 6 AE growth rate and n = 1 AE are stabilized in the LHD case. The helical coupling effects in LHD simulations lead to a transition from the interaction to the damped regime of the n = 2, –8, 12 helical family.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4];  [5]; ORCiD logo [2]
  1. National Institute of Natural Science, Toki (Japan). National Institute 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)
  4. National Institute of Natural Science, Toki (Japan). National Institute for Fusion Science
  5. Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Plasma Physics
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Magnetic Confinement Fusion Energy Research Program of China; National Natural Science Foundation of China (NSFC)
OSTI Identifier:
1648969
Grant/Contract Number:  
AC05-00OR22725; FC02-04ER54698; 11575249; 2015GB110005; 2015GB102000
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 6; 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; Plasma instabilities; stellarators; tokamaks; plasma waves; plasma confinement

Citation Formats

Varela, J., Spong, D. A., Garcia, L., Todo, Y., Huang, J., and Murakami, M.. Study of Alfven eigenmodes stability in plasma with multiple NBI driven energetic particle species. United States: N. p., 2019. Web. https://doi.org/10.1063/1.5098347.
Varela, J., Spong, D. A., Garcia, L., Todo, Y., Huang, J., & Murakami, M.. Study of Alfven eigenmodes stability in plasma with multiple NBI driven energetic particle species. United States. https://doi.org/10.1063/1.5098347
Varela, J., Spong, D. A., Garcia, L., Todo, Y., Huang, J., and Murakami, M.. Tue . "Study of Alfven eigenmodes stability in plasma with multiple NBI driven energetic particle species". United States. https://doi.org/10.1063/1.5098347. https://www.osti.gov/servlets/purl/1648969.
@article{osti_1648969,
title = {Study of Alfven eigenmodes stability in plasma with multiple NBI driven energetic particle species},
author = {Varela, J. and Spong, D. A. and Garcia, L. and Todo, Y. and Huang, J. and Murakami, M.},
abstractNote = {The aim of this study is to analyze the destabilization of Alfven Eigenmodes (AEs) by multiple energetic particle (EP) species in DIII-D and LHD discharges. In this work, we use the reduced 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 energetic particle species, including the effect of the acoustic modes, diamagnetic currents, and helical couplings. Furthermore, we add the Landau damping and resonant destabilization effects using a closure relation. The simulations with multiple neutral beam injector (NBI) lines show three different regimes: the nondamped regime where the multibeam AE growth rate is larger compared to the growth rate of the AEs destabilized by the individual NBI lines, the interaction regime where the multibeam AE growth rate is smaller than the single NBI AEs, and the damped regime where the AEs are suppressed. Operations in the damped regime require EP species with different density profile flatness or gradient locations. In addition, the AE growth rate in the interaction regime is further reduced if the combined NBI lines have similar beam temperatures and the β of the NBI line with a flatter EP density profile increases. Additionally, optimization trends are identified in DIII-D high poloidal β and LHD low density/magnetic field discharges with multiple NBI lines as well as the configuration requirements to operate in the damped and interaction regimes. DIII-D simulations show a decrease in the n = 2 to 6 AE growth rate and n = 1 AE are stabilized in the LHD case. The helical coupling effects in LHD simulations lead to a transition from the interaction to the damped regime of the n = 2, –8, 12 helical family.},
doi = {10.1063/1.5098347},
journal = {Physics of Plasmas},
number = 6,
volume = 26,
place = {United States},
year = {2019},
month = {6}
}

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