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

Nuclear Fushion

article

S. Wiesen¹  S. Brezinsek¹  M. Wischmeier²  E. De la Luna³  M. Groth⁴  A. E. Jaervinen⁵  E. de la Cal³  U. Losada³  A.M. de Aguilera³  L. Frassinetti⁶  Y. Gao¹  C. Guillemaut⁸  D. Harting⁹  A. Meigs⁹  K. Schmid²  G. Sergienko¹  JET contributors^1,10 

[1] Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung—Plasmaphysik;Max-Planck-Institut für Plasmaphysik;Laboratorio Nacional de Fusion;Aalto University;Lawrence Livermore National Laboratory;Association VR;Institute of Plasma Physics, Chinese Academy of Sciences;Instituto de Plasmas e Fusão Nuclear;CCFE, Culham Science Centre;EUROfusion Consortium, JET, Culham Science Centre

关键词: H-mode;    JET;    ITER-like wall;    integrated modelling;    pedestal fuelling;    plasma–wallinteraction;   

DOI  :  10.1088/1741-4326/aa69dd

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

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.

【 授权许可】

Unknown