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P: Plasmaphysik
P 4: Diagnostik 1; Niedertemperaturplasmen / Plasmatechnologie 2; Magnetischer Einschluß 2
P 4.39: Poster
Monday, March 27, 2006, 17:00–19:00, Flure
MHD equilibrium reconstruction with EFIT for TEXTOR — •Christopher Wiegmann1, Wolfgang Zwingmann2, Oliver Zimmermann1, Detlev Reiter1, and Robert Wolf1 — 1Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, EURATOM-Association, Trilateral Euregio Cluster, D-52425 Jülich, Germany — 2Association EURATOM-CEA/DSM/DRFC Cadarache, 13108 St-Paul-Lez-Durance, France
Reconstruction of 2D-MHD equilibria from experimental tokamak data is an important tool for determining the magnetic field structure and is essential for tokamak data analysis. Especially at TEXTOR with its dynamic ergodic divertor (DED) experiment it is crucial to know the equilibrium and the field structure close to the plasma boundary. In fact it has been found that the magnetic topology due to the DED is quite sensitive to the underlying plasma equilibrium.
We present the current status and first results of the implementation of the equilibrium reconstruction code EFIT [1] for TEXTOR based on the version currently in use at Tore Supra, CEA Cadarache. EFIT directly calculates the MHD equilibrium from experimental data by solving the Grad-Shafranov equation with the Green’s function approach and a Picard Iteration scheme. The unkown profiles (FF′(ψ) & P′(ψ)) are parametrized with a suitable set of test functions. Their coefficients are determined by a fitting procedure to measured data. Furthermore EFIT is capable of treating the iron core problem with sufficient accuracy and accounts for a correction due to the toroidal field ripple.
[1] W.Zwingmann, Nuclear Fusion 43, 842 (2003)