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Study of fast-ion transport induced by fishbones on JET
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Perez von Thun, C., Salmi, A., Perona, A., Sharapov, S. E. (Sergei E.), Pinches, Simon David, Popovichev, S., Conroy, S., Kiptily, V.G., Brix, M., Cecconello, M. and Johnson, T. (2012) Study of fast-ion transport induced by fishbones on JET. Nuclear Fusion, Vol.52 (No.9). 094010. doi:10.1088/0029-5515/52/9/094010 ISSN 0029-5515.
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Official URL: http://dx.doi.org/10.1088/0029-5515/52/9/094010
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.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Nuclear Fusion | ||||
Publisher: | Institute of Physics Publishing Ltd. | ||||
ISSN: | 0029-5515 | ||||
Official Date: | 3 September 2012 | ||||
Dates: |
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Volume: | Vol.52 | ||||
Number: | No.9 | ||||
Page Range: | 094010 | ||||
DOI: | 10.1088/0029-5515/52/9/094010 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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