Generation of shear flows induced by AE / EPM in LHD plasma

Varela, J.; Hidalgo, C.; Tokuzawa, T.; Nagaoka, K.; Tanaka, K.; Nagasaki, K.; Ohdachi, S.; Ida, K.; Du, X.; Cappa, A.; Sharapov, S.; Zarzoso, D.; Spong, D. A.; Garcia, L.; Ghai, Y.; Ortiz, J.

doi:10.1088/1741-4326/ad9ab6

Generation of shear flows induced by AE / EPM in LHD plasma

Journal Article · Wed Dec 18 00:00:00 EST 2024 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ad9ab6· OSTI ID:2482565

^[1]; ^[2]; ^[3]; ^[3]; ^[3]; ^[4]; Ohdachi, S. ^[3]; ^[3]; ^[5]; ^[2]; ^[6]; ^[7]; ^[8]; ^[9]; ^[8]; ^[9]

University of Texas at Austin, TX (United States); National Institute of Natural Science, Toki (Japan)
Laboratorio Nacional de Fusion-CIEMAT, Madrid (Spain)
National Institute of Natural Science, Toki (Japan)
Kyoto University (Japan)
General Atomics, San Diego, CA (United States)
Culham Science Centre, Oxfordshire (United Kingdom of Great Britain and Northern Ireland)
Aix Marseille Univ (France)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Universidad Carlos III de Madrid (Spain)

The generation of shear flows (SFs) by Alfven Eigenmodes (AEs) and energetic particle modes (EPMs) have important effects on the operation of future nuclear fusion reactors, because SFs regulate the saturation of the AEs/EPMs, the transport of EPs and thermal plasma, as well as the formation of transport barriers among other consequences. The aim of this study is the analysis of SFs generation during the saturation phase of AEs and EPMs in LHD plasma. Experiments performed in the 23rd and 24th LHD experimental campaigns are dedicated to explore the destabilization of AEs/EPMs in discharges with different heating patterns, thermal plasma and magnetic field configurations. In particular, the shots 176490 and 179697 show the destabilization of MHD bursts and energetic-ion-driven resistive interchange modes (EIC), respectively. Charge exchange spectroscopy measurements in both discharges indicate that the generation of SFs by AE/EPM is uncorrelated with the perturbation induced by the neutral beam injector (NBI). Nonlinear simulations performed using the gyro-fluid code FAR3d show the generation of zonal structures, especially SFs, induced during the saturation phase of Toroidal Alfven Eigenmodes (TAEs) triggered in the MHD burst as well as by the 1/1 EIC in the bursting phase. The simulations indicate that SFs are caused by the radial electric fields powered by energy transfers from the unstable AE/EPM towards the thermal plasma. The strongest SFs are measured during the EIC bursting phase once the 1/1 EPM overlaps with nearby resonances at the plasma periphery. Likewise, the largest SFs during the MHD burst are observed once TAEs radially overlap in the inner-middle plasma region.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); The University of Texas at Austin, TX (United States)

Sponsoring Organization:: Comunidad de Madrid; National Institute for Fusion Science; USDOE

Grant/Contract Number:: FG02-04ER54742

OSTI ID:: 2482565

Alternate ID(s):: OSTI ID: 2479950
OSTI ID: 3001999
OSTI ID: 2997898

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 2 Vol. 65; ISSN 0029-5515; ISSN 1741-4326

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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