Study of fast-ion transport induced by fishbones on JET

C. Perez von Thun, Antti Salmi, A. Perona, S.E. Sharapov, S.D. Pinches, S. Popovichev, S. Conroy, V.G. Kiptily, M. Brix, M. Cecconello, T. Johnson, JET EFDA contributors

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Abstract

The impact of fishbone oscillations onto a confined fast-ion population is simulated for a JET plasma and benchmarked against experiment quantitatively with the help of neutron rate measurements. The transient drops in volume integrated neutron emission are found to be mainly caused by the spatial redistribution of the (neutral beam injected) fast-ion population confined in the plasma rather than by fast-ion loss. The simulations yield a quadratic dependence of the neutron drop on the fishbone amplitude. It is found that the simulations are able to correctly reproduce the magnitude of the experimentally observed drop in volume integrated neutron emission to within a factor 2. Furthermore, frequency chirping is found to be important. Omitting the fishbone frequency chirp in the simulations reduces the magnitude of the neutron rate drop (and hence fast-ion redistribution) to about half its original value.
Original languageEnglish
Article number094010
JournalNuclear Fusion
Volume52
Issue number9
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

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    Perez von Thun, C., Salmi, A., Perona, A., Sharapov, S. E., Pinches, S. D., Popovichev, S., Conroy, S., Kiptily, V. G., Brix, M., Cecconello, M., Johnson, T., & contributors, JET. EFDA. (2012). Study of fast-ion transport induced by fishbones on JET. Nuclear Fusion, 52(9), [094010]. https://doi.org/10.1088/0029-5515/52/9/094010