Berlin 2005 – wissenschaftliches Programm

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SYPZ: Plasmaphysik und Fusionsforschung - Energie für die Zukunft

SYPZ 1: SYPZ I

SYPZ 1.3: Hauptvortrag

Dienstag, 8. März 2005, 12:00–12:30, HU 3038

Energetic ion physics for burning plasmas — •Ambrogio Fasoli — CRPP EPFL, CH-1015 Lausanne, Switzerland

Reaching a basic understanding of the behavior of burning plasmas (self-heating due to fusion produced α-particles dominates the heating of the plasma) represents one of the primary scientific challenges in the effort of demonstrating the scientific feasibility of fusion. A number of new phenomena are expected in a burning plasma regime, including effects of alpha particles on macroscopic plasma stability, the transport of alpha particles induced by background plasma turbulence, the dynamics of the fusion burn, and the interaction of alphas with plasma waves and instabilities, possibly leading to their redistribution and losses. Although this new field of research will only be assessed, in an integrated way, in new, dedicated experimental facilities, such as the International Tokamak Experimental Reactor (ITER), present experiments producing weakly self-heated plasmas can investigate specific scientific issues in regimes relevant to burning plasmas. Particular attention is given to Alfvén Eigenmodes (AEs), weakly damped modes that resonate with alpha particles and other energetic ions in the MeV energy range and can induce ion redistribution and losses. Examples of studies of the stability, nonlinear properties and control methods for AEs for different plasma parameters and different additional heating schemes will be shown.