Details

Autor(en) / Beteiligte

• 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.

Titel

Sensitivity of alpha-particle-driven Alfvén eigenmodes to q-profile variation in ITER scenarios

Ist Teil von

• Nuclear fusion, 2016-11, Vol.56 (11), p.112006-112011

Ort / Verlag

IOP Publishing

Erscheinungsjahr

2016

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 Ip=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.