Coherence imaging of scrape-off-layer and divertor impurity flows in the Mega Amp Spherical Tokamak (invited)

Silburn, S.A.; Harrison, J.R.; Howard, J.; Gibson, K.J.; Meyer, H.; Michael, C.A.; Sharples, R.M.

doi:10.1063/1.4891165

Coherence imaging of scrape-off-layer and divertor impurity flows in the Mega Amp Spherical Tokamak (invited)

Silburn, S.A.; Harrison, J.R.; Howard, J.; Gibson, K.J.; Meyer, H.; Michael, C.A.; Sharples, R.M.

Authors

S.A. Silburn

J.R. Harrison

J. Howard

K.J. Gibson

H. Meyer

C.A. Michael

Professor Ray Sharples r.m.sharples@durham.ac.uk
Professor

Abstract

A new coherence imaging Doppler spectroscopy diagnostic has been deployed on the UK’s Mega Amp Spherical Tokamak for scrape-off-layer and divertor impurity flow measurements. The system has successfully obtained 2D images of C III, C II, and He II line-of-sight flows, in both the lower divertor and main scrape-off-layer. Flow imaging has been obtained at frame rates up to 1 kHz, with flow resolution of around 1 km/s and spatial resolution better than 1 cm, over a 40° field of view. C III data have been tomographically inverted to obtain poloidal profiles of the parallel impurity flow in the divertor under various conditions. In this paper we present the details of the instrument design, operation, calibration, and data analysis as well as a selection of flow imaging results which demonstrate the diagnostic's capabilities.

Citation

Silburn, S., Harrison, J., Howard, J., Gibson, K., Meyer, H., Michael, C., & Sharples, R. (2014). Coherence imaging of scrape-off-layer and divertor impurity flows in the Mega Amp Spherical Tokamak (invited). Review of Scientific Instruments, 85(11), Article 11D703. https://doi.org/10.1063/1.4891165

Journal Article Type	Article
Acceptance Date	Jul 1, 2014
Online Publication Date	Aug 1, 2014
Publication Date	Nov 1, 2014
Deposit Date	Aug 4, 2014
Publicly Available Date	Aug 5, 2014
Journal	Review of Scientific Instruments
Print ISSN	0034-6748
Electronic ISSN	1089-7623
Publisher	American Institute of Physics
Peer Reviewed	Peer Reviewed
Volume	85
Issue	11
Article Number	11D703
DOI	https://doi.org/10.1063/1.4891165

Files

Published Journal Article (1.9 Mb)
PDF

Copyright Statement
© 2014 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Silburn, S. A., Harrison, J. R., Howard, J., Gibson, K. J., Meyer, H., Michael, C. A. and Sharples, R. M. (2014) 'Coherence imaging of scrape-off-layer and divertor impurity flows in the Mega Amp Spherical Tokamak (invited).', Review of scientific instruments., 85 (11). 11D703 and may be found at http://dx.doi.org/10.1063/1.4891165.