Berlin 2005 – wissenschaftliches Programm

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SYPZ: Plasmaphysik und Fusionsforschung - Energie für die Zukunft

SYPZ 2: SYPZ II

SYPZ 2.2: Hauptvortrag

Dienstag, 8. März 2005, 14:30–15:00, HU 3038

Anomalous transport in tokamak plasmas — •Arthur G. Peeters — Max Planck Intitut fuer plasma physics, Boltzmannstr. 2 85748 Garching

In a fusion reactor energy and particles must be confined for a sufficient long time in order for a sufficient amount of fusion reactions to occur. Transport fluxes, however, do not follow the classical predictions based on particle orbits and Coulomb collisions. It is refered to as anomalous, and is thought to be the consequence of micro-instabilities leading to a turbulent state. The study of anomalous transport recieves much attention because it is a key issue for a reactor, but also because it is a chalanging physics problem. Turbulence in a tokamak has several unique features compared to other physical systems due to the existence of a strong magnetic field in combination with a (nearly) collisionless plasma.

In this talk the basic features of the micro-instabilities are discussed. Driving and damping terms as well as the role of basic physics ingredients, such as collisions, are introduced. The non-linear state and saturation mechanisms are then reviewed. After this discussion on theory a critical comparison with the experimental observations is presented. The latter will show that significant progress has been made in the last decade.