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(CT/P-06) Collective Modes and Fast Particle Confinement in ITER

A. Jaun¹⁾, S. Briguglio²⁾, G. Fogaccia²⁾, C. Gormezano²⁾, F. Zonca²⁾, G. Vlad², A. Fasoli³, D. Testa³⁾, S. Konovalov⁴⁾, L. Chen⁵⁾, W.W. Heidbrink⁵⁾, K. Tobita⁶⁾, M. Takechi⁶⁾, K. Shinohara⁶⁾, A. Fukuyama⁷⁾, K. Miyamoto^8)
 
1) NADA- Euratom-VR Association, Stockholm, Sweden
²⁾ ENEA C.R., Frascati, Rome, Italy
³⁾ CRPP, EPF Lausanne, Switzerland
⁴⁾ Kurchatov Institute, Moscow, Russia
⁵⁾ University of California, Irvine, USA
⁶⁾ JAERI, Naka, Japan
⁷⁾ Kyoto University, Kyoto, Japan
⁸⁾ University of Tokyo, Japan

Abstract.  An overview of the energetic particles confinement research is presented for ITER. Instabilities and toroidal magnetic field inhomogeneities play an important role and are studied in different plasma configurations. Theoretical models have identified key stabilizing mechanisms in experiments: they are used to check parametric dependencies against existing measurements and to extrapolate into reactor conditions that remain inaccessible in present day tokamaks. The calculations suggest that conventional burn scenarios are generally compatible with a substantial amount of alpha-particles, but a limit exists above which shear-reversal leads to a degradation of the confinement.

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