Impact of the JET ITER-like wall on H-mode plasma fueling

Wiesen, S.; Meigs, A.; de la Cal, E.; Schmid, K.; de Aguilera, A. M.; De la Luna, E.; Losada, U.; Jaervinen, A. E.; Groth, M.; Guillemaut, C.; Sergienko, G.; Frassinetti, L.; Wischmeier, M.; Harting, D.; Brezinsek, S.; Gao, Y.

doi:10.1088/1741-4326/aa69dd

Journal Article

FZJ-2017-04298

Impact of the JET ITER-like wall on H-mode plasma fueling

Wiesen, S. (Corresponding author)FZJ* ; Brezinsek, S.FZJ* ; Wischmeier, M. ; De la Luna, E. ; Groth, M.FZJ* ; Jaervinen, A. E. ; de la Cal, E. ; Losada, U. ; de Aguilera, A. M. ; Frassinetti, L. ; Gao, Y.FZJ* ; Guillemaut, C. ; Harting, D. ; Meigs, A. ; Schmid, K. ; Sergienko, G.FZJ*

2017
IAEA Vienna

Nuclear fusion 57(6), 066024 - (2017) [10.1088/1741-4326/aa69dd]

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Please use a persistent id in citations: http://hdl.handle.net/2128/14737 doi:10.1088/1741-4326/aa69dd

Abstract: JET ITER-like wall (ILW) experiments show that the edge density evolution is strongly linked with the poloidal distribution of the ionization source. The fueling profile in the JET-ILW is more delocalized as compared to JET-C (JET with carbon-based plasma-facing components PFCs). Compared to JET-C the H-mode pedestal fueling cycle is dynamically influenced by a combination of plasma–wall interaction features, in particular: (1) edge-localized modes (ELMs) induced energetic particles are kinetically reflected on W divertor PFCs leading to distributed refueling away from the divertor depending on the divertor plasma configuration, (2) delayed molecular re-emission and outgassing of particles being trapped in W PFCs (bulk-W at the high field side and W-coated CFCs at the low field side) with different fuel content and (3) outgassing from Be co-deposits located on top of the high-field side baffle region shortly after the ELM. In view of the results of a set of well diagnosed series of JET-ILW type-I ELMy H-mode discharges with good statistics, the aforementioned effects are discussed in view of H-mode pedestal fueling capacity. The ongoing modelling activities with the focus on coupled core-edge plasma simulations and plasma–wall interaction are described and discussed also in view of possible code improvements required.

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