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Numerical study on CX-neutral transport and wall-sputtering in W7-AS diverted plasmas

Funded under: FP7-EURATOM

Abstract

Using the 3D SOL transport code EMC3/EIRENE, the paper presents a parameter study on CX-neutral transport and Fe-release from the wall due to physical sputtering in W7-AS diverted plasmas. The studies are restricted to the CX-neutrals induced by divertor and wall recycling processes. SOL plasma and divertor and wall recycling process are self-consistently calculated by the EMC3/EIRENE code. Island density is scanned across different confinement regimes. Cross-field transport coefficients are varied to cover an appropriate uncertainty range. Core plasma is prescribed, with the density profile, however, being switched between a peaked and a flat form typically measured for low and high density diverted plasmas. Studied are the sensitivities of the flux, energy spectrum and origin of the CX-neutrals to these parameters. In particular, it is aimed to identify under what condition and to what extent the edge islands can protect the wall from physical sputtering of the CX-neutrals.

Additional information

Authors: FENG Y, Max-Planck-Institut für Plasmaphysik, EURATOM Association, Teilinstitut Greifswald, Greifswald (DE);SARDEI F, Max-Planck-Institut für Plasmaphysik, EURATOM Association, Teilinstitut Greifswald, Greifswald (DE);GRIGULL P, Max-Planck-Institut für Plasmaphysik, EURATOM Association, Teilinstitut Greifswald, Greifswald (DE);MCCORMICK K, Max-Planck-Institut für Plasmaphysik, EURATOM Association, Teilinstitut Greifswald, Greifswald (DE);KISSLINGER J, Max-Planck-Institut für Plasmaphysik, EURATOM Association, Teilinstitut Greifswald, Greifswald (DE);REITER D, Institut für Plasmaphysik, Forschungszentrum Jülich, Association EURATOM/FZJ, Trilateral Euregio Cluster, Jülich (DE);HARTING D, Institut für Plasmaphysik, Forschungszentrum Jülich, Association EURATOM/FZJ, Trilateral Euregio Cluster, Jülich (DE)
Bibliographic Reference: An article published in: Journal of Nuclear Materials, Volumes 363-365 (2007), pp. 353-358
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/doi:10.1016/j.jnucmat.2007.01.122
Record Number: 200719334 / Last updated on: 2007-09-06
Category: PUBLICATION
Original language: en
Available languages: en