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Abstract

Though helium plasmas are one option for the low activation phase of ITER, little effort has thus far been devoted to studying them in a large, diverted tokamak. A recent campaign on JET has therefore sought to address some of the important questions related to helium operation (He concentrations near 90%) in single null configurations, particularly with regard to edge and diverter physics. This contribution compiles a selection of results from these experiments, in which, in each case, discharges have been chosen to match as closely as possible previous, well-characterised D plasmas in both L and ELMing H-modes. These matched pulses are used to draw conclusions regarding the principle source and location of carbon production in D plasmas, to compare and contrast the mechanisms of the density limit and the detachment process in D and He, to investigate the nature of cross-field power transport in the SOL and to gain insight into the process by which ELM energy is transported to the diverter targets.

This was originally an oral paper presented at the 15th International Conference on Plasma Surface Interactions in Controlled Fusion Devices (PSI-15), organised by the National Institute for Fusion Science, Japan, and held at Gifu, Japan, May 27-31, 2002.

Additional information

Authors: PITTS A, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);WISCHMEIER M, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);ANDREW P ET AL, Euratom-UKAEA Fusion Association, Culham Science Center, Abingdon (GB);BECOULET M, Association EURATOM-CEA Cadarache, Saint-Paul-Lez-Durance (FR);LOARER T, Association EURATOM-CEA Cadarache, Saint-Paul-Lez-Durance (FR);COSTER D ET AL, Max-Planck-Institut für Plasmaphysik, EURATOM-Association, Garching (DE);FENSTERMACHER E, Lawrence Livermore National Laboratory, Livermore (US);PORTER G, Lawrence Livermore National Laboratory, Livermore (US);TSITRONE E, Lawrence Livermore National Laboratory, Livermore (US);HIDALGO C, Asociación EURATOM-CIEMAT, Madrid (ES);HILLIS D, Oak Ridge National Laboratory, Oak Ridge (US);HUBER A ET AL, FZJ-Forschungszentrum Jülich, Association Euratom-FZJ, Jülich (DE);INGESSON L C, FOM-Rijnhuizen, Association Euratom-FOM, Nieuwegein (NL);JACHMICH S, LPP, ERM/KMS, Association Euratom-Belgian State, Brussels (BE);LOARTE A, EFDA-CSU, Max-Planck-Institut für Plasmaphysik, Garching (DE);SAIBENE G, EFDA-CSU, Max-Planck-Institut für Plasmaphysik, Garching (DE);SARTORI R, EFDA-CSU, Max-Planck-Institut für Plasmaphysik, Garching (DE)
Bibliographic Reference: An article published in: Journal of Nuclear Materials, Vols 313-316 , March 2003, pp.777-786 It can be accessed online by subscribers, or ordered online by non-subscribers, at: http://dx.doi.org/10.1016/S0022-3115%2802%2901429-0
Availability: The original oral paper is included in report LRP 727/02, available free from: École Polytechnique Fédérale de Lausanne, Ecublens, CH-1015 Lausanne, Fax +41-21-693474
ISBN: ISSN: 0458-5895
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