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

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

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

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.

Original languageEnglish
Article number066024
JournalNuclear Fusion
Volume57
Issue number6
DOIs
Publication statusPublished - 26 Apr 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • H-mode
  • integrated modelling
  • ITER-like wall
  • JET
  • pedestal fuelling
  • plasma-wall interaction

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