Sensitivity of alpha-particle-driven Alfvén eigenmodes to q-profile variation in ITER scenarios
Author(s)Rodrigues, P.; Figueiredo, A.C.A.; Borba, D.; Coelho, R.; Fazendeiro, L.; Ferreira, J.; Nabais, F.; Pinches, S.D.; Polevoi, A.R.; Sharapov, S.E.; Gomes Loureiro, Nuno F; ... Show more Show less
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A perturbative hybrid ideal-MHD/drift-kinetic approach to assess the stability of alpha-particle-driven Alfvï¿½n eigenmodes in burning plasmas is used to show that certain foreseen ITER scenarios, namely the MA baseline scenario with very low and broad core magnetic shear, are sensitive to small changes in the background magnetic equilibrium. Slight variations (of the order of ) of the safety-factor value on axis are seen to cause large changes in the growth rate, toroidal mode number, and radial location of the most unstable eigenmodes found. The observed sensitivity is shown to proceed from the very low magnetic shear values attained throughout the plasma core, raising issues about reliable predictions of alpha-particle transport in burning plasmas.
DepartmentMassachusetts Institute of Technology. Plasma Science and Fusion Center
Rodrigues, P. et al. “Sensitivity of Alpha-Particle-Driven Alfvén Eigenmodes to q-Profile Variation in ITER Scenarios.” Nuclear Fusion 56, 11 (July 2016): 112006 © 2016 EURATOM
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