Kiel 2004 – wissenschaftliches Programm

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P: Plasmaphysik

P 10: Postersitzung: Niedertemperaturplasmen Plasmatechnologie II, Staubige Plasmen II, Magnetischer Einschluss II

P 10.21: Poster

Dienstag, 9. März 2004, 17:45–19:30, Foyer

Modelling of the effects from the Dynamic Ergodic Divertor (DED) on global plasma behavior in TEXTOR — •X. Loozen, M. Tokar, and R. Wolf — Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, EURATOM Association, D-52425 Jülich, Germany

Control of transport processes at plasma edge of fusion devices is important to maintain stationary operation of thermonuclear reactors. One way to achieve this is the application of Ergodic Divertors (ED). ED generate perturbations of the magnetic field at the plasma edge and change significantly plasma transport properties. ED have been tested on several tokamaks and recently, the operation of TEXTOR with the Dynamic Ergodic Divertor (DED) has been started. In order to investigate the effect of DED on the global plasma behavior some amendments will be made in the 1-D transport code RITM. This code can not be, however, applied in the laminar zone, where magnetic field lines make relatively short excursions between intersections of divertor plates. By using a simple model for the DED magnetic field, the width of the laminar zone is estimated analytically as a function of the position of the resonant surface, the amplitude and poloidal mode number m of the perturbation. It is shown that the laminar zone width depends almost linearly on the perturbation amplitude for high values of m. For low m values, the laminar zone width increases non-linearly with the amplitude. It is also demonstrated that the laminar zone becomes thinner with increasing mode number.