2D modelling of electron and ion temperature in the plasma edge and SOL

Livia Isoardi (1) , Hugo Bufferand (1) , Guillaume Chiavassa (1) , Guido Ciraolo (1) , Frédéric Schwander (1) , Eric Serre (1) , Stéphane Viazzo (1) , Nicolas Fedorczak (2) , Philippe Ghendrih (2) , J. Gunn (2) , Yanick Sarazin (2) , Patrick Tamain (2)

1 M2P2 - Laboratoire de Mécanique, Modélisation et Procédés Propres
2 IRFM - Institut de Recherche sur la Fusion par confinement Magnétique

We are interested here in modelling the electron and ion temperature fields, Te and Ti respectively, in order to understand the main trends that govern the ratio Ti/Te that is being better documented in the SOL with RFA probes and . The experimental evidence gathered from several devices indicates that this temperature ratio significantly exceeds unity in most data sets that have been analysed, including measurements in the SOL of limiter devices like Tore Supra. Several issues of interest have been addressed with this version of the SOLEDGE-2D code. First, we have analysed the width of the SOL heat channels to the wall components and compared these values to analytical expressions. The key control mechanism of the width of the SOL heat channel is given by a balance between the sheath boundary conditions and the transverse transport. More advanced simulations address the interplay between the edge and SOL plasma allowing one to recover regimes with Ti/Te > 1.

Domaines: Mécanique des fluides [physics.class-ph]; Mécanique des fluides [physics.class-ph]

Livia Isoardi, Hugo Bufferand, Guillaume Chiavassa, Guido Ciraolo, Frédéric Schwander, et al.. 2D modelling of electron and ion temperature in the plasma edge and SOL. Journal of Nuclear Materials, 2011, 415 (1), pp.S574-S578. ⟨10.1016/j.jnucmat.2010.12.318⟩. ⟨hal-00848528⟩