Simulations of the edge plasma: the role of atomic, molecular and surface physics
Atomic, molecular and surface physics plays an important role in simulations of the edge plasma in present day tokamaks, and in the predictive simulations of new devices. The edge plasma - in this context, the Scrape-Off Layer (SOL), the Private Flux Region (PFR) and core region close to the separatrix (or Last Closed Flux Surface, LCFS) - provides the boundary conditions for the main plasma, and is the region where much of the power and all of the particle exhaust occurs. It is also the region where the plasma interacts with solid surfaces, puffed gases and gas arising from recycling. The results of plasma edge simulations can depend strongly on the availability and quality of the atomic, molecular and surface data (the peak plasma temperature at the divertor was found to vary by a factor of five dependent on the choice of atomic physics data in a recent sensitivity analysis). The current material choice for ITER with Plasma Facing Components (PFCs) consisting of C, Be and W also presents challenges, both in the availability of the necessary data for W, and in the plethora of charge states for W. Another challenge presented by the material choice is the likely presence of mixed materials formed by the migration of material from one surface to another. These introduce effects like alloying and preferential sputtering as well as new (much longer) time-scales in the problem.Efforts to incorporate a bundled charge state model within one of the present edge simulation codes, SOLPS, will be described, as well as efforts to address some of the questions raised by mixed materials. Some issues related to data consistency and traceability within the context of the European effort on Integrated Tokamak Modelling will also be addressed.
SOLPS Plasma Edge Simulations Atomic-Molecular-Surface Processes in a Plasma
D.P.Coster X.Bonnin D.Reiter A.Kukushkin S.Gori P.Krstic P.Strand L.-G.Eriksson Contributors to the EFDA-TF-ITM
Max-Planck-Institut fur Plasmaphysik, EURATOM Association, D-85748 Garching, Germany CNRS-UMHP, Universite Paris 13, F-93430 Villetaneuse, France Institut fur Plasmaphysik, FZ Jiilich, EURATOM Association, Jiilich, Germany ITER Organization, Cadarache, France Oak Ridge National Laboratory, Oak Ridge, TN, USA Chalmers University, Gothenburg, Sweden CEA, IRFM, F-I3I08 Saint-Paul-lez-Durance, France Various EURATOM Associations across Europe
国际会议
北京
英文
113-122
2008-10-27（万方平台首次上网日期，不代表论文的发表时间）