Recent H majority inverted radio frequency heating scheme experiments in JET-ILW

¹ LPP-ERM/KMS, EUROfusion Consortium Member - Trilateral Euregio Cluster, Brussels, Belgium
² CCFE, Culham Science Centre, Abingdon, OX14 3DB, UK
³ Max-Planck-Institut für Plasmaphysik, Garching, Germany
⁴ Department of Applied Physics, Ghent University, Ghent, Belgium
⁵ Institute of Plasma Physics and Laser Microfusion, Hery 23, 01-497 Warsaw, Poland
⁶ CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
⁷ Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden
⁸ Istituto di Fisica del Plasma “Piero Caldirola”, IFP-CNR, via R. Cozzi 53, 20125 Milano, Italy
⁹ NERSC, MS 59R4010A Berkeley, CA 94720, USA
¹⁰ Associação EURATOM/IST, Instituto de Plasmas e Fusão Nuclear, Instituto Superior
¹¹ Dipartimento di Fisica “G. Occhialini”, Università di Milano-Bicocca, 20126 Milano, Italy
¹² VTT Technical Research Centre, FI-02044 Espoo, Finland
¹³ Technical University of Denmark, Department of Physics, Kgs. Lyngby, Denmark
¹⁴ ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 St. Paul-lez-Durance Cedex, France
¹⁵ Ecole Polytechnique Fédérale de Lausanne (EPFL), SPC, CH-1015 Lausanne, Switzerland

^* Corresponding author: d.van.eester@fz-juelich.de

Published online: 23 October 2017

Abstract

Inverted ³He and D ion cyclotron minority heating scenarios were recently tested in JET-ILW. They confirm the good heating efficiency at low concentrations of ∼3%. The ³He minority heating scheme is only modestly affected by the change from a carbon (JET-C) to a Beryllium (JET-ILW) wall but unlike what was the case in JET-C, the intrinsic Be ions D-like particles in terms of charge-over-mass ratio do not prevent the D (or ⁴He) minority regime from being exploited. Direct and indirect evidence of the existence of fast particle subpopulations was found in both cases.