Fusion product losses due to fishbone instabilities in deuterium JET plasmas

During development of a high-performance hybrid scenario for future deuterium–tritium experiments on the Joint European Torus, an increased level of fast ion losses in the MeV energy range was observed during the instability of high-frequency n  =  1 fishbones. The fishbones are excited during deute...

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Detalles Bibliográficos
Autores: Kiptily, V.G., Fitzgerald, M., Goloborodko, V., Sharapov, S.E., Challis, C.D., Frigione, D., Graves, J., Mantsinen, Mervi, Beaumont, P., Garcia-Munoz, M., Perez von Thun, C., Rodriguez, J.F.R., Darrow, D., Keeling, D., King, D., McClements, K.G., Solano, E.R., Schmuck, S., Sips, G., Szepesi, G., 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:2117/110868
Acceso en línea:https://hdl.handle.net/2117/110868
https://dx.doi.org/10.1088/1741-4326/aa9340
Access Level:acceso abierto
Palabra clave:Fusion reactions
Plasma dynamics
Fusion
JET plasmas
MHD
Cyclotron heating
Fusió nuclear controlada
Tècniques de plasma
Àrees temàtiques de la UPC::Física
Descripción
Sumario:During development of a high-performance hybrid scenario for future deuterium–tritium experiments on the Joint European Torus, an increased level of fast ion losses in the MeV energy range was observed during the instability of high-frequency n  =  1 fishbones. The fishbones are excited during deuterium neutral beam injection combined with ion cyclotron heating. The frequency range of the fishbones, 10–25 kHz, indicates that they are driven by a resonant interaction with the NBI-produced deuterium beam ions in the energy range  ≤120 keV. The fast particle losses in a much higher energy range are measured with a fast ion loss detector, and the data show an expulsion of deuterium plasma fusion products, 1 MeV tritons and 3 MeV protons, during the fishbone bursts. An MHD mode analysis with the MISHKA code combined with the nonlinear wave-particle interaction code HAGIS shows that the loss of toroidal symmetry caused by the n  =  1 fishbones affects strongly the confinement of non-resonant high energy fusion-born tritons and protons by perturbing their orbits and expelling them. This modelling is in a good agreement with the experimental data.

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