Significance of the Radial Electric Field to Divertor Load Asymmetries |
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| Authors: | T Kurki-Suonio SK Sipilä TP Kiviniemi JA Heikkinen W Fundamenski GF Matthews V Riccardo |
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| Institution: | (1) Euratom-TEKES Association, Helsinki University of Technology, P.O. Box 2200, FIN-02015 HUT, Finland;(2) Euratom-TEKES Association, VTT Chemical Technology, P.O. Box 1404, FIN-02044 VTT, Finland;(3) UKAEA/Euratom Fusion Association, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK |
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| Abstract: | JET divertor load measurements using embedded thermocouples have indicated a large target asymmetry and non-uniformities in the loads and that, under H-mode conditions, the load is dominated by the ion component. ASCOT simulations of the ion contribution to JET divertor loads are consistent with the presence of a large outward radial electric field E
r in the scrape-off layer (SOL) next to the separatrix. Such a field would provide an explanation for observed features of the divertor loads in JET. The required field for getting the correct in/out asymmetry is within the range of the estimated SOL E
r in JET, but reproducing the experimental heat deposition profiles requires higher field values. |
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