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Synergetic heating of D-NBI ions in the vicinity of the mode conversion layer in H-D plasmas in JET with the ITER like wall.
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2017 (English)In: EPJ Web of Conferences, EDP Sciences, 2017, 02006Conference paper (Refereed)
Abstract [en]

This paper discusses the extension of the 'three-ion' species ICRF technique for heating mixture plasmas using fast injected NBI ions as resonant 'third' species. In this scenario the ICRF power is absorbed by the fast beam ions in the vicinity of the mode conversion layer where the left-hand polarized RF electric field E+ is strongly enhanced. The ions in the beam velocity distribution that have a Doppler-shifted resonance close to the mode conversion layer efficiently absorb RF power and undergo acceleration. We show first experimental observations of ICRF heating of D-NBI ions in H-D plasmas in JET with the ITER-like wall. In agreement with theoretical predictions and numerical modelling, acceleration of the D-NBI ions in this D-(DNBI)-H scenario is confirmed by several fast-ion measurements. An extension of the heating scheme discussed here is acceleration of T-NBI and D-NBI ions in D-T plasmas, offering the potential to further boost the Q-value in future D-T campaigns in JET.

Place, publisher, year, edition, pages
EDP Sciences, 2017. 02006
Series
EPJ Web of Conferences, ISSN 2101-6275
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-217485DOI: 10.1051/epjconf/201715702006Scopus ID: 2-s2.0-85032616487OAI: oai:DiVA.org:kth-217485DiVA: diva2:1156853
Conference
22nd Topical Conference on Radio-Frequency Power in Plasmas 2017, Centre de Congres, Aix en Provence, France, 30 May 2017 through 2 June 2017
Note

QC 20171114

Available from: 2017-11-14 Created: 2017-11-14 Last updated: 2017-11-14Bibliographically approved

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