Stuttgart 2012 – wissenschaftliches Programm
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SYGP: Symposium Gemeinsame Probleme in Fusions- und astrophysikalischen Plasmen
SYGP 3: Contributed Talks
SYGP 3.7: Vortrag
Montag, 12. März 2012, 18:00–18:15, V55.22
3D gyrofluid simulations of explosive collisionless reconnection — •Alessandro Biancalani1,2 and Bruce D. Scott1 — 1Max-Planck-Institut für Plasmaphysik, Euratom Association, D-85748 Garching, Germany — 2Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany
The nonlinear dynamics of collisionless reconnecting modes is investigated, in the framework of a three-dimensional gyrofluid model. This is the relevant regime of high-temperature plasmas, where reconnection is made possible by electron inertia and has higher growth rates than resistive reconnection. The presence of a strong guide field is assumed, in a background slab model wih Dirichlet boundary conditions in the direction of nonuniformity. Values of ion sound gyro-radius and electron collisionless skin depth much smaller than the current layer width are considered. Strong acceleration of growth is found at the onset to nonlinearity, while at all times the energy functional is well conserved. Nonlinear growth rates more than one order of magnitude higher than linear growth rates are observed when entering into the small-Δ′ regime.