期刊
NUCLEAR FUSION
卷 63, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1741-4326/aca98e
关键词
stellarator; Heliotron J; ECH; MHD; AE; EPM; energetic particles
The effect of electron cyclotron heating (ECH) on the stability of Alfven eigenmodes (AEs) and energetic particle modes (EPMs) triggered by energetic ions in Heliotron J plasma was analyzed in this study. The analysis used the FAR3d code to simulate a reduced MHD model for the thermal plasma coupled with a gyrofluid model for the energetic particle species. The simulations reproduced the observed stability trends of AE/EPM as electron temperature (T-e) increased, modifying various parameters.
The aim of the present study is to analyze the effect of the electron cyclotron heating (ECH) on the linear stability of Alfv & eacute;n 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 beta, EP beta 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 beta 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 beta increases with T-e.
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