Sensitivity of alpha-particle-driven Alfvén eigenmodes to q-profile variation in ITER scenarios. (22nd July 2016)

• Record Type: Journal Article
• Authors: Rodrigues, P.; Figueiredo, A.C.A.; Borba, D.; Coelho, R.; Fazendeiro, L.; Ferreira, J.; Loureiro, N.F.; Nabais, F.; Pinches, S.D.; Polevoi, A.R.; Sharapov, S.E.
• Is Part Of: Nuclear fusion. Volume 56:Number 11(2016:Nov.)
• Publication Date: 2016-07-22
• Subjects: Alfvén eigenmodes -- alpha-particles -- linear stability -- ITER; Nuclear fusion -- Periodicals; 621.48405
• DOI: 10.1088/0029-5515/56/11/112006
• Languages: English
• ISSNs: 0029-5515

Abstract

Abstract: A perturbative hybrid ideal-MHD/drift-kinetic approach to assess the stability of alpha-particle-driven Alfvén eigenmodes in burning plasmas is used to show that certain foreseen ITER scenarios, namely the I p = 15 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 1 % ) 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.