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Fast-ion deuterium alpha spectroscopic observations of the effects of fishbones in the Mega-Ampere Spherical Tokamak
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Jones, O. M., Michael, C. A., McClements, K. G., Conway, N. J., Crowley, B. J. B., Akers, R. J., Lake, R. J. and Pinches, Simon David (2013) Fast-ion deuterium alpha spectroscopic observations of the effects of fishbones in the Mega-Ampere Spherical Tokamak. Plasma Physics and Controlled Fusion, 55 (8). 085009. doi:10.1088/0741-3335/55/8/085009 ISSN 0741-3335.
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Official URL: http://dx.doi.org/10.1088/0741-3335/55/8/085009
Abstract
Using the recently installed fast-ion deuterium alpha (FIDA) spectrometer, the effects of low-frequency (20–50 kHz) chirping energetic particle modes with toroidal mode number n ≥ 1 on the neutral beam injection-driven fast-ion population in Mega-Ampere Spherical Tokamak (MAST) plasmas are considered. Results from the FIDA diagnostic are presented and discussed in the light of the present theoretical understanding of these modes, known as fishbones, in plasmas with reversed shear. Measurements of the fast-ion population reveal strong redistribution of fast ions in both real and velocity space as a result of the fishbones. Time-resolved measurements throughout the evolution of a fishbone show radial redistribution of fast ions with energies up to 95% of the primary beam injection energy. Correlations between changes in the FIDA signal and the peak time derivative of the magnetic field perturbation are observed in a limited range of operating scenarios. The transient reduction in signal caused by a fishbone may in some cases reach 50% of the signal intensity before mode onset.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Journal or Publication Title: | Plasma Physics and Controlled Fusion | ||||||
Publisher: | Institute of Physics Publishing Ltd. | ||||||
ISSN: | 0741-3335 | ||||||
Official Date: | August 2013 | ||||||
Dates: |
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Volume: | 55 | ||||||
Number: | 8 | ||||||
Article Number: | 085009 | ||||||
DOI: | 10.1088/0741-3335/55/8/085009 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access |
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