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P: Fachverband Plasmaphysik
P 14: Magnetischer Einschluss
P 14.1: Vortrag
Mittwoch, 21. März 2007, 14:35–14:50, 6B
Status of Equilibrium Reconstruction with EFIT at TEXTOR including 3D effects — •Christopher Wiegmann1, Oliver Zimmermann1, Detlev Reiter1, and Wolfgang Zwingmann2 — 1Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, EURATOM-Association, Trilateral Euregio Cluster, 52425 Jülich, Germany — 2Association EURATOM-CEA/DSM/DRFC Cadarache, 13108 St-Paul-Lez-Durance, France
The equilibrium reconstruction code EFIT [1] has been installed at the iron core tokamak TEXTOR and its applicability to TEXTOR conditions and configurations is analyzed. EFIT uses an interleaved Picard and fitting iteration scheme to solve the Grad-Shafranov equation with experimental data as constraints. Magnetic diagnostics are used as basic input. The problem of equilibrium reconstruction is ill-posed, especially from external magnetic data only. To resolve this additional input from internal MSE and kinetic measurements is needed. It is found that the available magnetic diagnostics at TEXTOR are insufficient in number and distribution to obtain key plasma parameters such as e.g. βpol to an acceptable accuracy. Hence, an extension of the diagnostic system is proposed on the basis of EFIT tests. A 3D correction for the magnetic field ripple of the toroidal field coils based on earlier work [2] has now been made available for TEXTOR. Further steps to incorporate 3D perturbations of the dynamic ergodic divertor on the equilibrium are undertaken and first results are given.
[1] Zwingmann, W. NF 43 (2003) pp. 842 [2] Zwingmann, W. AIP Conf.Proc. 871 (2006) pp. 430