Analysis of the ECH effect on EPM/AE stability in Heliotron J plasma using a Landau closure model

Varela Rodriguez, J.; Nagasaki, K.; Kobayashi, S.; Nagaoka, K.; Adulsiriswad, P.; Cappa, A.; Yamamoto, S.; Watanabe, K. Y.; Spong, D. A.; Garcia, L.; Ghai, Y.; Ortiz, J.

doi:10.1088/1741-4326/aca98e

Analysis of the ECH effect on EPM/AE stability in Heliotron J plasma using a Landau closure model

Journal Article · Wed Dec 28 00:00:00 EST 2022 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aca98e· OSTI ID:2000282

^[1]; ^[2]; Kobayashi, S. ^[2]; ^[3]; Adulsiriswad, P. ^[3]; ^[4]; Yamamoto, S. ^[5]; Watanabe, K. Y. ^[3]; ^[6]; ^[1]; ^[6]; Ortiz, J. ^[1]

Univ. Carlos III de Madrid (Spain)
Kyoto Univ. (Japan)
National Institute of Natural Sciences (NINS) (Japan)
Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain). Laboratorio Nacional de Fusion
National Institutes for Quantum and Radiological Science and Technology, Naka, Ibaraki (Japan)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

The aim of the present study is to analyze the effect of the electron cyclotron heating (ECH) on the linear stability of Alfvén eigenmodes (AEs) and energetic particle modes (EPMs) triggered by energetic ions in Heliotron J plasma. The analysis is performed using the FAR3d code that solves a reduced MHD model to describe the thermal plasma coupled with a gyrofluid model for the energetic particle (EP) species. The simulations reproduce the AE/EPM stability trends observed in the experiments as the electron temperature (T_e) increases, modifying the thermal plasma β, EP β and EP slowing-down time. Particularly, the $n/m = 1/2$ EPM and $2/4$ Global AE are stabilized in the low-bumpiness (LB) configuration due to an enhancement of the continuum, finite Larmor radius and e-i Landau damping effects as the thermal β increases. On the other hand, a larger ECH injection power cannot stabilize the AE/EPM in medium-bumpiness and high-bumpiness (HB) configurations because the damping effects are weaker compared to the LB case, unable to balance the further destabilization induced by an enhanced EP resonance as the EP slowing-down time and EP β increases with T_e.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2000282

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 2 Vol. 63; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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