Effect of the tangential NBI current drive on the stability of pressure and energetic particle driven MHD modes in LHD plasma
Abstract
The aim of the present study is to analyze the stability of the pressure gradient driven modes (PM) and Alfvén eigenmodes (AE) in the large helical device (LHD) plasma if the rotational transform profile is modified by the current drive of the tangential neutral beam injectors (NBI). This study forms a basic search for optimized operation scenarios with reduced mode activity. Here, the analysis is performed using the code FAR3d which solves the reduced MHD equations describing the linear evolution of the poloidal flux and the toroidal component of the vorticity in a full 3D system, coupled with equations for density and parallel velocity moments of the energetic particle (EP) species, including the effect of the acoustic modes. The Landau damping and resonant destabilization effects are added via the closure relation. On-axis and off-axis NBI current drive modifies the rotational transform which becomes strongly distorted as the intensity of the neutral beam current drive (NBCD) increases, leading to wider continuum gaps and modifying the magnetic shear. The simulations with on-axis NBI injection show that a counter (ctr-) NBCD in inward shifted and default configurations leads to a lower growth rate of the PM, although strong n = 1 and 2more »
- Authors:
-
[1];
[1];
[3];
- National Institute for Fusion Science (NIFS), Toki (Japan)
- Ecole Polytechnique Federale Lausanne (Switzerland)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. Carlos III de Madrid (Spain)
- Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE; National Institute of Fusion Science (NIFS)
- OSTI Identifier:
- 1817581
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 60; Journal Issue: 2; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Stellarator; LHD; MHD; AE; energetic particles
Citation Formats
Varela Rodriguez, Jacobo V., Cooper, W. A., Nagaoka, K., Watanabe, K. Y., Spong, Donald A., Garcia, L., Cappa, A., and Azegami, A. Effect of the tangential NBI current drive on the stability of pressure and energetic particle driven MHD modes in LHD plasma. United States: N. p., 2020.
Web. doi:10.1088/1741-4326/ab60cf.
Varela Rodriguez, Jacobo V., Cooper, W. A., Nagaoka, K., Watanabe, K. Y., Spong, Donald A., Garcia, L., Cappa, A., & Azegami, A. Effect of the tangential NBI current drive on the stability of pressure and energetic particle driven MHD modes in LHD plasma. United States. https://doi.org/10.1088/1741-4326/ab60cf
Varela Rodriguez, Jacobo V., Cooper, W. A., Nagaoka, K., Watanabe, K. Y., Spong, Donald A., Garcia, L., Cappa, A., and Azegami, A. Thu .
"Effect of the tangential NBI current drive on the stability of pressure and energetic particle driven MHD modes in LHD plasma". United States. https://doi.org/10.1088/1741-4326/ab60cf. https://www.osti.gov/servlets/purl/1817581.
@article{osti_1817581,
title = {Effect of the tangential NBI current drive on the stability of pressure and energetic particle driven MHD modes in LHD plasma},
author = {Varela Rodriguez, Jacobo V. and Cooper, W. A. and Nagaoka, K. and Watanabe, K. Y. and Spong, Donald A. and Garcia, L. and Cappa, A. and Azegami, A.},
abstractNote = {The aim of the present study is to analyze the stability of the pressure gradient driven modes (PM) and Alfvén eigenmodes (AE) in the large helical device (LHD) plasma if the rotational transform profile is modified by the current drive of the tangential neutral beam injectors (NBI). This study forms a basic search for optimized operation scenarios with reduced mode activity. Here, the analysis is performed using the code FAR3d which solves the reduced MHD equations describing the linear evolution of the poloidal flux and the toroidal component of the vorticity in a full 3D system, coupled with equations for density and parallel velocity moments of the energetic particle (EP) species, including the effect of the acoustic modes. The Landau damping and resonant destabilization effects are added via the closure relation. On-axis and off-axis NBI current drive modifies the rotational transform which becomes strongly distorted as the intensity of the neutral beam current drive (NBCD) increases, leading to wider continuum gaps and modifying the magnetic shear. The simulations with on-axis NBI injection show that a counter (ctr-) NBCD in inward shifted and default configurations leads to a lower growth rate of the PM, although strong n = 1 and 2 AEs can be destabilized. For the outward shifted configurations, a co-NBCD improves the AEs stability but the PM are further destabilized if the co-NBCD intensity is 30 kA T–1. If the NBI injection is off-axis, the plasma stability is not significantly improved due to the further destabilization of the AE and energetic particle modes (EPM) in the middle and outer plasma region.},
doi = {10.1088/1741-4326/ab60cf},
journal = {Nuclear Fusion},
number = 2,
volume = 60,
place = {United States},
year = {Thu Jan 16 00:00:00 EST 2020},
month = {Thu Jan 16 00:00:00 EST 2020}
}
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