MHD stability trends and improved performance of LHD inward-shifted configurations: The role of the neutral beam current drive and thermal plasma density

Varela, J.; Nagaoka, K.; Takemura, Y.; Watanabe, K. Y.; Ida, K.; Yoshinuma, M.; Nagasaki, K.; Cappa, A.; Sharapov, S.; Spong, D. A.; Garcia, L.; Ghai, Y.; Ortiz, J.

doi:10.1063/5.0206400

MHD stability trends and improved performance of LHD inward-shifted configurations: The role of the neutral beam current drive and thermal plasma density

Journal Article · Mon Aug 05 04:00:00 EDT 2024 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0206400· OSTI ID:2567707

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The aim of the present study is to analyze the effect of the neutral beam current drive (NBCD), thermal plasma density, and NBI operational regime on the stability of pressure gradient-driven modes (PGDM) and Alfvén eigenmodes (AE) in LHD inward-shifted configurations. The stabilization of n/m=1/2 PGDM (n toroidal mode and m poloidal mode) is observed in the discharge 167 800 during the co-NBCD phase. The iota profile evolution measured by motional stark effect diagnostic may indicate the iota profile up-shift caused by the co-NBCD can induce a non-resonant transition of the rational surface 1/2 before the mode stabilization. The evolution of the iota profile and continuum gaps in the discharge 167 805 during the ctr-NBCD phase leads to the stabilization of the AE, caused by the narrowing of the continuum gap as the iota profile down-shift. Opposite stability trends are identified for PGDM and AE stability with respect to the thermal plasma density. A larger thermal plasma density (larger thermal β) further enhances PGDM although the continuum gaps are narrower leading to configurations with stable AEs. The linear stability of AEs is analyzed using the gyro-fluid FAR3d code to reproduce the AE stability trends observed in the experiments with respect to the NBCD and thermal plasma density. The analysis of hypothetical scenarios dedicated to study different NBI operational regimes with respect to EP energy, and β and radial density profiles indicate off-axis NBI operation shows a higher EP β threshold to destabilize AEs compared to on-axis configuration. This is explained by the presence of a TAE gap in the inner plasma region, easily destabilized by an on-axis NBI injection. The control of the NBCD and thermal plasma in the discharge 167 800 shows a transitory stabilization of PGDM and AEs, as well as an improved discharge performance identified by an increment of the neutron fluxes.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: NONE; FG02-04ER54742

OSTI ID:: 2567707

Alternate ID(s):: OSTI ID: 3002011

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 31; ISSN 1070-664X

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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High Frequency Alfvén Eigen Modes Observed in LHD Higaki, Hiroyuki; Ichimura, Makoto; Inoue, Daisuke Plasma and Fusion Research, Vol. 1 https://doi.org/10.1585/pfr.1.034	journal	January 2006
Ion Heating Experiments Using Perpendicular Neutral Beam Injection in the Large Helical Device Nagaoka, Kenichi; Yokoyama, Masayuki; Takeiri, Yasuhiko Plasma and Fusion Research, Vol. 3 https://doi.org/10.1585/pfr.3.S1013	journal	January 2008
First Demonstration of Rotational Transform Control by Electron Cyclotron Current Drive in Large Helical Device Notake, Takashi; Shimozuma, Takashi; Kubo, Shin Plasma and Fusion Research, Vol. 3 https://doi.org/10.1585/pfr.3.S1077	journal	January 2008
Monte-Carlo Study Based on Real Coordinates for Perpendicularly Injected High-Energy Ions in the LHD High-Beta Plasma Seki, Ryosuke; Matsumoto, Yutaka; Suzuki, Yasuhiro Plasma and Fusion Research, Vol. 5 https://doi.org/10.1585/pfr.5.014	journal	January 2010
Monte Carlo Study Based on a Real Coordinate System for Tangentially Injected High-Energy Particles in the Large Helical Device Seki, Ryosuke; Matsumoto, Yutaka; Suzuki, Yasuhiro Plasma and Fusion Research, Vol. 5 https://doi.org/10.1585/pfr.5.027	journal	January 2010
Ballooning Modes Instabilities in Outward LHD Configurations Varela, Jacobo; Watanabe, Kiyomasa Y.; Nakajima, Noriyoshi Plasma and Fusion Research, Vol. 6 https://doi.org/10.1585/pfr.6.1403013	journal	January 2011
ECCD Experiment Using an Upgraded ECH System on LHD Yoshimura, Yasuo; Kubo, Shin; Shimozuma, Takashi Plasma and Fusion Research, Vol. 7, Issue 0 https://doi.org/10.1585/pfr.7.2402020	journal	January 2012
Observation of Low Frequency MHD Mode Driven by Energetic Particles in Large Helical Device Plasmas with Strong Interchange Mode Activities Chen, Wei; Isobe, Mitsutaka; Toi, Kazuo Plasma and Fusion Research, Vol. 7, Issue 0 https://doi.org/10.1585/pfr.7.2402079	journal	January 2012
Long-Term Landau-Fluid Simulation of Alfvén Eigenmode Instabilities Spong, Donald A. Plasma and Fusion Research, Vol. 9, Issue 0 https://doi.org/10.1585/pfr.9.3403077	journal	January 2014

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