Ion cyclotron resonance heating (ICRH) is one of the main auxiliary heating systems used in present-day tokamaks and is planned to be installed in ITER. In the initial full-field phase of ITER operating with hydrogen majority plasmas, fundamental resonance heating of helium-3 ions is one of a few ICRH schemes available. Past JET experiments with the carbon wall revealed a significant impact of impurities on the ICRH performance in plasmas. A significant reduction of the helium-3 concentration, at which the transition from minority ion to mode conversion heating occurs, was found to be due to a high plasma contamination with carbon ions. In this paper we discuss the effect of Be and another impurity species present at JET after the installation of a new ITER-like wall on the transition helium-3 concentration in plasmas. We suggest a potential method for controlling helium-3 level needed for a specific ICRH regime by puffing an extra helium-4 gas to the plasma.
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12 February 2014
RADIOFREQUENCY POWER IN PLASMAS: Proceedings of the 20th Topical Conference
25–28 June 2013
Sorrento, Italy
Research Article|
February 12 2014
Influence of impurities on the transition from minority to mode conversion heating in ())- plasmas
Ye. O. Kazakov;
Ye. O. Kazakov
LPP-ERM/KMS, Association EURATOM-Belgian State, Trilateral Euregio Cluster Partner, Brussels,
Belgium
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T. Fülöp;
T. Fülöp
Department of Applied Physics, Nuclear Engineering, Chalmers University of Technology and Euratom-VR Association, Göteborg,
Sweden
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D. Van Eester
D. Van Eester
LPP-ERM/KMS, Association 'EURATOM-Belgian State', Trilateral Euregio Cluster Partner, Brussels,
Belgium
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Ye. O. Kazakov
T. Fülöp
D. Van Eester
LPP-ERM/KMS, Association EURATOM-Belgian State, Trilateral Euregio Cluster Partner, Brussels,
Belgium
AIP Conf. Proc. 1580, 302–305 (2014)
Citation
Ye. O. Kazakov, T. Fülöp, D. Van Eester; Influence of impurities on the transition from minority to mode conversion heating in ())- plasmas. AIP Conf. Proc. 12 February 2014; 1580 (1): 302–305. https://doi.org/10.1063/1.4864548
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