Study of fast-ion transport induced by fishbones on JET

Christian 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; The EFDA-JET Contributors

doi:10.1088/0029-5515/52/9/094010

Study of fast-ion transport induced by fishbones on JET

Christian 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, The EFDA-JET 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 language	English
Article number	094010
Journal	Nuclear Fusion
Volume	52
Issue number	9
DOIs	https://doi.org/10.1088/0029-5515/52/9/094010
Publication status	Published - 2012
MoE publication type	A1 Journal article-refereed

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https://pure.mpg.de/pubman/item/item_2146074_3/component/file_2146073/PerezVonThun_Study.pdf

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title = "Study of fast-ion transport induced by fishbones on JET",

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.",

author = "{Perez von Thun}, Christian and Antti Salmi and A. Perona and S.E. Sharapov and S.D. Pinches and S. Popovichev and S. Conroy and V.G. Kiptily and M. Brix and M. Cecconello and T. Johnson and {The EFDA-JET Contributors}",

year = "2012",

doi = "10.1088/0029-5515/52/9/094010",

language = "English",

volume = "52",

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publisher = "Institute of Physics IOP",

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TY - JOUR

T1 - Study of fast-ion transport induced by fishbones on JET

AU - Perez von Thun, Christian

AU - Salmi, Antti

AU - Perona, A.

AU - Sharapov, S.E.

AU - Pinches, S.D.

AU - Popovichev, S.

AU - Conroy, S.

AU - Kiptily, V.G.

AU - Brix, M.

AU - Cecconello, M.

AU - Johnson, T.

AU - The EFDA-JET Contributors

PY - 2012

Y1 - 2012

N2 - 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.

AB - 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.

U2 - 10.1088/0029-5515/52/9/094010

DO - 10.1088/0029-5515/52/9/094010

M3 - Article

SN - 0029-5515

VL - 52

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 9

M1 - 094010

ER -

Study of fast-ion transport induced by fishbones on JET

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