Berlin 2014 – scientific programme
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P: Fachverband Plasmaphysik
P 17: Poster Session - Helmholtz Graduate School for Plasma Physics
P 17.4: Poster
Wednesday, March 19, 2014, 16:30–18:30, SPA Foyer
Reconstruction of q-profiles using Monte-Carlo-technique — •Alexander Bock1, Jörg Stober1, Rainer Fischer1, Patrick Mc Carthy2, Matthias Reich1, and ASDEX Upgrade Team1 — 1Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Deutschland — 2Department of Physics, University College Cork, Cork, Ireland
The helicity of magnetic field lines is an important property of equilibrium states of magnetically confined plasmas. It can be expressed through so-called q-profiles and has decisive influence not only on transport of heat and particles in the plasma, but also on its stability.
Typically magnetic equilibria are being calculated through iterative techniques where the solutions of the Grad-Shafranov-equation are being varied until the result is in sufficient agreement with the experimentally measured quantities. Aside from physical data, other less physical aspects like the choice of basis functions play a role which can make these techniques biased. Sampling possible equilibria using Monte-Carlo-simulations can yield more unbiased results.
This poster gives and overview over the basics of equilibrium reconstruction, describes a new reconstruction technique for q-profiles/equilibria based in Monte-Carlo-simulations and compares it with previous results.