SMuK 2021 – scientific programme
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P: Fachverband Plasmaphysik
P 4: Magnetic Confinement II
P 4.2: Talk
Tuesday, August 31, 2021, 11:30–11:45, H5
Analytical model for collisional impurity transport covering all collisionality regimes — •Daniel Fajardo1,2, Clemente Angioni1, Patrick Maget3, Pierre Manas3, and the ASDEX Upgrade Team1 — 1Max-Plack-Institut für Plasmaphysik, Garching, Germany — 2Technische Universität München, Munich, Germany — 3CEA/IRFM, Saint Paul-lez-Durance, France
In tokamak plasmas, collisional transport of impurities can be dominant over turbulent transport, particularly for heavy impurities. A recent analytical model for the Pfirsch-Schlüter (PS) flux, including the self-consistent coupling to the poloidal density distribution [P. Maget et al, Plasma Phys. Control. Fusion 62 (2020) 105001], is extended to cover all collisionality regimes, relaxing the condition of main ions in the deep banana regime. Additionally, a fully analytical model for the Banana-Plateau (BP) flux was developed, completing the neoclassical flux. This new model is compared to the drift-kinetic code NEO and the fluid code NCLASS, showing agreement with NEO on broad scans in collisionality, trapped particle fraction, charge and mass. A change in magnitude and even in sign in the temperature screening effect at the transition between the BP and PS regimes is identified and well reproduced. Radial profiles of transport coefficients are calculated for ASDEX Upgrade experimental profiles and ITER and DEMO predicted profiles, and successfully compared to NEO and NCLASS. This model is suited for fast integrated modelling applications due to its low computational cost.