Multiscale effects in plasma microturbulence [Elektronische Ressource] / vorgelegt von Tobias Görler

MULTISCALE EFFECTS IN PLASMAMICROTURBULENCEDissertationzur Erlangung des DoktorgradesDr. rer. nat.der Fakult at fur Naturwissenschaftender Universit at Ulmvorgelegt vonTobias GorlerausWittenUlm 2009Amtierender Dekanbei der Er o nung des Promotionsverfahrens: Prof. Dr. Peter B auerleAmtierender Dekanbeim Abschluss des Promotionsverfahrens: Prof. Dr. Axel Gro Erstgutachter: apl. Prof. Dr. Frank JenkoZweitgutachter: Prof. Dr. Peter ReinekerDrittgutachter: Prof. Dr. Steven CowleyTag der Promotion: 16. Dezember 2009AbstractMicroinstabilities are one of the key physics problems on the way to e cient powerplants based on nuclear fusion. They cause anomalous heat and particle transport whichsigni cantly degrades the plasma con nement quality, thus preventing self-sustainingplasma burning in present-day experiments. However, due to their complex dynamicsand highly nonlinear character, it is impossible to solve the underlying equations ofturbulent systems analytically|a problem which is also well known in several otherphysics research elds, e.g. aerodynamics. Theoretical descriptions and predictions aretherefore typically based on numerical simulations. Here, the multitude of involvedspace and time scales may cause problems since the parameters required for a numericaltreatment { e.g., the grid resolutions { often turn out to be infeasible for computations.