Equilibrium Flows in Non-linear MHD Simulations of X-point Plasmas
- Association Euratom-CEA, CEA/DSM/IRFM/SCCP/GTTM, Centre de Cadarache, 13108 Saint-Paul-Lez-Durance (France)
In non-linear MHD simulations of ELMs, a radially localised, toroidally symmetric, poloidal flow layer exists in the H-mode pedestal region. This sheared flow layer could have a significant influence on the linear stability properties of MHD instabilities and their non-linear evolution. Using the non-linear MHD simulation code JOREK with reduced resistive MHD equations, we study the edge-localised poloidal flow in both circular and X-point tokamak plasmas at equilibrium (toroidal symmetry). For the circular case, an analytical interpretation is derived. In the simulations of X-point plasmas, the flow can have both m = 0 and m = 1 components. In fact, abrupt transitions take place between the two equilibrium states, accompanied by a strong increase in the kinetic energy. Similar transitions between equilibrium flow states have been predicted by Strauss for m = 0 poloidal flow patterns. Scalings are obtained for both the m = 1 and m = 0 flows.
- OSTI ID:
- 21251754
- Journal Information:
- AIP Conference Proceedings, Vol. 1069, Issue 1; Conference: Joint Varenna-Lausanne international workshop on theory of fusion plasmas, Varenna (Italy), 25-29 Aug 2008; Other Information: DOI: 10.1063/1.3033721; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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