Kiel 2011 – scientific programme
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P: Fachverband Plasmaphysik
P 11: Poster: Hochtemperaturplasmen: Theorie und Simulation
P 11.4: Poster
Tuesday, March 29, 2011, 17:00–19:00, Foyer
Modelling of ELM with a current relaxation model — •Jonathan Pearson1, Yunfeng Liang1, Dirk Reiser1, Youwen Sun1, Tao Zhang1, Chris Gimblett2, and Phillippa Browning3 — 1Institute of Energy and Climate Research/Plasma Physics, Forschungszentrum Jülich GmbH, Association EURATOM-FZJ, Partner in the Trilateral Euregio Cluster, Jülich, Germany — 2EURATOM/CCFE Fusion Association, Culham Science Centre,Abingdon, Oxon, OX14 3DB, United Kingdom — 3School of Physicsand Astronomy, University of Manchester, Manchester, United Kingdom
Using a Taylor relaxation theory, initilised by an external peeling mode, the widths and frequencies of Edge Localised Modes (ELM) can be modeled. From this the dependence of the ELM frequency on the edge safety factor is investigated and a development of multiple resonance at lower values of the normalised edge current density is observed. The addition of small derivations of the plasma current control leads to a possible explanation for the range of ELM frequencies experimentally observed. A comparison of experimental observations taken from the TEXTOR H-mode plasma is found to have good agreement with this modeling results. The basic assumptions and the range of validity of the model are discussed. The extensions to an application of this concept to scenarios with Resonant Magnetic Perturbations are sketched.