Effect of the tangential NBI current drive on the stability of pressure and energetic particle driven MHD modes in LHD plasma

Varela Rodriguez, Jacobo V.; Cooper, W. A.; Nagaoka, K.; Watanabe, K. Y.; Spong, Donald A.; Garcia, L.; Cappa, A.; Azegami, A.

doi:10.1088/1741-4326/ab60cf

Title: Effect of the tangential NBI current drive on the stability of pressure and energetic particle driven MHD modes in LHD plasma

Journal Article · Thu Jan 16 00:00:00 EST 2020 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ab60cf· OSTI ID:1817581

^[1]; Cooper, W. A. ^[2];

^[1]; Watanabe, K. Y. ^[1];

^[3]; Garcia, L. ^[4]; Cappa, A. ^[5]; Azegami, A. ^[1]

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)

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.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; National Institute of Fusion Science (NIFS)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1817581

Journal Information:: Nuclear Fusion, Vol. 60, Issue 2; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Effect of the tangential NBI current drive on the stability of pressure and energetic particle driven MHD modes in LHD plasma

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