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Title: Comparison of ICRF and NBI heated plasmas performances in the JET ITER-like wall

During the initial operation of the JET ITER-like wall, particular attention was given to the characterization of the Ion Cyclotron Resonance Frequency (ICRF) heating in this new metallic environment. In this contribution we compare L-modes plasmas heated by ICRF or by Neutral Beam Injection (NBI). ICRF heating as expected led to a much higher centrally peaked power deposition on the electrons and due to the central fast ion population to stronger sawtooth activity. Surprisingly, although a higher bulk radiation was observed during the ICRF phase, the thermal plasma energy was found similar for both cases, showing that a higher radiation inside the separatrix was not incompatible with an efficient central heating scheme. The higher radiation was attributed to the presence Tungsten (W). Tomographic inversion of SXR emissions allowed a precise observation of the sawtooth effect on the radiation pattern. W concentration profiles deconvolved from SXR emission showed the flattening of the profiles due to sawtooth for both heating and the peaking of the profiles in the NBI case only hinting for extra transport effect in the ICRF case.
Authors:
 [1] ; ;  [2] ;  [3] ; ; ; ;  [4] ;  [5] ;  [6] ;  [7] ;
  1. EFDA Close Support Unit, Garching, Germany and Euratom/CCFE Association, Culham Science Centre, Abingdon, OX14 3DB (United Kingdom)
  2. Max-Planck-Institut für Plasmaphysik, EURATOM-Assoziation, Garching (Germany)
  3. Euratom/CCFE Association, Culham Science Centre, Abingdon, OX14 3DB (United Kingdom)
  4. CEA, IRFM, F-13108 Saint-Paul-Lez-Durance (France)
  5. Association Euratom-IPPLM, Hery 23, 01-497 Warsaw (Poland)
  6. Association Euratom-IPP.CR, Institute of Plasma Physics AS CR, 18200 Prague (Czech Republic)
  7. EFDA Close Support Unit, Garching, Germany and Max-Planck-Institut für Plasmaphysik, EURATOM-Assoziation, Garching (Germany)
Publication Date:
OSTI Identifier:
22263860
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1580; Journal Issue: 1; Conference: 20. topical conference on radiofrequency power in plasmas, Sorrento (Italy), 25-28 Jun 2013; Other Information: (c) 2014 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BEAM INJECTION; DEPOSITION; EMISSION; ICR HEATING; ION CYCLOTRON-RESONANCE; ITER TOKAMAK; L-MODE PLASMA CONFINEMENT; PLASMA; PLASMA INSTABILITY; TUNGSTEN