Comprehensive evaluation of the linear stability of Alfvén eigenmodes driven by alpha particles in an ITER baseline scenario
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1601.06621.pdf
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Author(s)
Figueiredo, A.C.A.
Rodrigues, P.
Borba, D.
Coelho, R.
Fazendeiro, L.
Ferreira, J.
Nabais, F.
Pinches, S.D.
Polevoi, A.R.
Sharapov, S.E.
Date Issued
June 2016
Journal
Nuclear Fusion
Publisher
IOP Publishing
Citation
Figueiredo, A.C.A. et al. “Comprehensive Evaluation of the Linear Stability of Alfvén Eigenmodes Driven by Alpha Particles in an ITER Baseline Scenario.” Nuclear Fusion 56, 7 (June 2016): 076007 © 2016 EURATOM
Version
Original manuscript
Abstract
The linear stability of Alfvén eigenmodes in the presence of fusion-born alpha particles is thoroughly assessed for two variants of an ITER baseline scenario, which differ significantly in their core and pedestal temperatures. A systematic approach based on CASTOR-K (Borba and Kerner 1999 J. Comput. Phys. 153 101; Nabais et al 2015 Plasma Sci. Technol. 17 89) is used that considers all possible eigenmodes for a given magnetic equilibrium and determines their growth rates due to alpha-particle drive and Landau damping on fuel ions, helium ashes and electrons. It is found that the fastest growing instabilities in the aforementioned ITER scenario are core-localized, low-shear toroidal Alfvén eigenmodes. The largest growth-rates occur in the scenario variant with higher core temperatures, which has the highest alpha-particle density and density gradient, for eigenmodes with toroidal mode numbers . Although these eigenmodes suffer significant radiative damping, which is also evaluated, their growth rates remain larger than those of the most unstable eigenmodes found in the variant of the ITER baseline scenario with lower core temperatures, which have and are not affected by radiative damping.
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1088/0029-5515/56/7/076007
