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

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2017-04-26
Major/Subject
Mcode
Degree programme
Language
en
Pages
Series
NUCLEAR FUSION, Volume 57, issue 6
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.
Description
Keywords
H-mode, integrated modelling, ITER-like wall, JET, pedestal fuelling, plasma-wall interaction
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Citation
Wiesen , S , Brezinsek , S , Wischmeier , M , De La Luna , E , Groth , M , Jaervinen , A E , de la Cal , E , Losada , U , Martin de Aguilera , A , Frassinetti , L , Gao , Y , Guillemaut , C , Harting , D , Meigs , A , Schmid , K & Sergienko , G 2017 , ' Impact of the JET ITER-like wall on H-mode plasma fueling ' , Nuclear Fusion , vol. 57 , no. 6 , 066024 . https://doi.org/10.1088/1741-4326/aa69dd