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Impact of the JET ITER-like wall on H-mode plasma fueling
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2017 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 57, no 6, article id 066024Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Institute of Physics Publishing , 2017. Vol. 57, no 6, article id 066024
Keywords [en]
H-mode, integrated modelling, ITER-like wall, JET, pedestal fuelling, plasma-wall interaction, Carbon, Coated fuel particles, Cobalt deposits, Electric discharges, Fueling, Jets, Plasma interactions, Plasma turbulence, Tokamak devices, Plasma wall interaction, Plasma simulation
National Category
Fusion, Plasma and Space Physics Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-216521DOI: 10.1088/1741-4326/aa69ddISI: 000425870200002Scopus ID: 2-s2.0-85019398296OAI: oai:DiVA.org:kth-216521DiVA, id: diva2:1161843
Note

Funding details: EC, European Commission; Funding text: This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

QC 20171201

Available from: 2017-12-01 Created: 2017-12-01 Last updated: 2018-03-09Bibliographically approved

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Frassinetti, Lorenzo

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