Hannover 2016 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 5: Poster Session- Helmholtz Graduate School for Plasma Physics
P 5.3: Poster
Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof
Kinetic simulation of parallel electron heat flux in scrape-off layer — •menglong zhao1,2, alex chankin1, and david coster1 — 1Max-Planck-Institut für Pasmaphysik, Boltzmannstraße 2, 85748 Garching bei München, Germany — 2Technische Universität München, 80333 München, Germany
Parallel electron heat flux on open field lines is studied with the 1D2V kinetic Vlasov-Fokker-Planck (VFP) code KIPP [1-3]. In order to assess the importance of kinetic effects on the scrape-off layer heat transport in a systematic way, a series of self-similar cases with the stagnation point and one target, logical sheath condition, parabolic ion velocity profiles reaching ion sound speed at the target and 100% recycling of neutrals were run, from which the electron temperature profile and electron parallel heat flux are compared with those from classical fluid model. It shows that, for high collisional plasma parallel conductive electron heat flux is highly consistent with Spitzer-Harm theory[4]. With decreasing collisionality, it is deviating increasingly from the classical theory showing limited heat flux upstream and flux enhancement downstream due to non-local effect. In addition, electron heat transmission coefficient γe varies much with collisionality. Thermal force coefficient is studied as well. It shows consistency with deviation of heat flux, lower than 0.71 upstream and higher downstream for low collisional plasma, however consistent with classical value for high collisional plasma as expectation. Kinetic corrections to electron heat conduction coefficient, heat transmission coefficient and thermal force coefficient are needed for fluid model, which could be done with KIPP.