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Title: The influence of an ITER-like wall on disruptions at JET

In order to preserve the integrity of large tokamaks such as ITER, the number of disruptions has to be limited. JET has operated previously with a low frequency of disruptions (i.e., disruption rate) of 3.4% [P. C. de Vries et al., Nucl. Fusion 51, 053018 (2011)]. The start of operations with the new full-metal ITER-like wall at JET showed a marked rise in the disruption rate to 10%. A full survey was carried out to identify the root causes, the chain-of-events and classifying each disruption, similar to a previous analysis for carbon-wall operations. It showed the improvements made to avoid various disruption classes, but also indicated those disruption types responsible for the enhanced disruption rate. The latter can be mainly attributed to disruptions due to too high core radiation but also due to density control issues and error field locked modes. Detailed technical and physics understanding of disruption causes is essential for devising optimized strategies to avoid or mitigate these events.
Authors:
;  [1] ; ;  [2] ;  [3] ; ;  [4] ; ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;
  1. FOM institute DIFFER, EURATOM association, P.O. Box 1207, Nieuwegein (Netherlands)
  2. Consorzio RFX, EURATOM-ENEA Association, Corso Stati Uniti 4, 35127 Padova (Italy)
  3. ERM/KMS, Association EURATOM-Belgian State, B-1000 Brussels, Brussels (Belgium)
  4. IRFM-CEA, Centre de Cadarache, 13108 Sant-Paul-lez-Durance (France)
  5. CCFE/Fusion Association, Culham Science Centre, Abingdon OX14 3DB (United Kingdom)
  6. Associação EURATOM-IST, Instituto de Plasmas e Fusão Nuclear, 1049-001 Lisboa (Portugal)
  7. Max-Planck-Institut für Plasmaphysik, EURATOM Association, 85748 Garching (Germany)
  8. Asociación EURATOM/CIEMAT para Fusión, Madrid (Spain)
  9. (United Kingdom)
Publication Date:
OSTI Identifier:
22253056
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 5; Other Information: (c) 2014 EURATOM; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ITER TOKAMAK; JET TOKAMAK; THERMONUCLEAR REACTOR WALLS