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Title: The impact of poloidal asymmetries on tungsten transport in the core of JET H-mode plasmas

Recent progress in the understanding and prediction of the tungsten behaviour in the core of JET H-mode plasmas with ITER-like wall is presented. Particular emphasis is given to the impact of poloidal asymmetries of the impurity density. In particular, it is shown that the predicted reduction of temperature screening induced by the presence of low field side localization of the tungsten density produced by the centrifugal force is consistent with the observed tungsten behaviour in a JET discharge in H-mode baseline scenario. This provides first evidence of the role of poloidal asymmetries in reducing the strength of temperature screening. The main differences between plasma parameters in JET baseline and hybrid scenario discharges which affect the impact of poloidally asymmetric density on the tungsten radial transport are identified. This allows the conditions by which tungsten accumulation can be avoided to be more precisely defined.
Authors:
; ;  [1] ; ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7]
  1. Max-Planck-Institut für Plasmaphysik, D–85748 Garching (Germany)
  2. CCFE, Culham Science Centre, Abingdon OX14 3DB (United Kingdom)
  3. Istituto di Fisica del Plasma, CNR/ENEA, Milano (Italy)
  4. Consorzio RFX-CNR/ENEA, I-35127 Padova (Italy)
  5. General Atomics, PO Box 85608, San Diego, California 92186-5608 (United States)
  6. Max-Planck Institut für Plasmaphysik, Greifswald (Germany)
  7. (United Kingdom)
Publication Date:
OSTI Identifier:
22410379
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 5; Other Information: (c) 2015 EURATOM; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ASYMMETRY; FIRST WALL; H-MODE PLASMA CONFINEMENT; ITER TOKAMAK; JET TOKAMAK; PLASMA; PLASMA DENSITY; PLASMA IMPURITIES; TEMPERATURE MONITORING; TUNGSTEN