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

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 polari...

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Detalles Bibliográficos
Autores: Ongena, J., Kazakov, Ye O., Baranov, Y., Hellesen, C., Eriksson, J., Johnson, T., Kiptily, V.G., Mantsinen, Mervi J., Nocente, M., Bilato, R., Cardinali, A., Castaldo, C., Crombé, K., Czarnecka, A., Dumont, R., Faustin, J., Giacomelli, L., Goloborodko, V., Graves, J., Jacquet, Ph., Krawczyk, N., Lerche, E., Meneses, L., Nave, M.F.F., Patten, H., Schneider, M., Van Eester, D., Weisen, H., Wright, J.C., JET Contributors
Tipo de recurso: artículo
Fecha de publicación:2017
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/109708
Acceso en línea:https://hdl.handle.net/2117/109708
https://dx.doi.org/10.1051/epjconf/201715702006
Access Level:acceso abierto
Palabra clave:Plasma heating
Ion cyclotron range of frequencies
Fusion research
Tècniques de plasma
Àrees temàtiques de la UPC::Física
Descripción
Sumario: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.

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