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

Silburn, S. A. and Harrison, J. R. and Howard, J. and Gibson, K. J. and Meyer, H. and 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.

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.

Item Type:Article
Additional Information:Invited paper, published as part of the Proceedings of the 20th Topical Conference on High-Temperature Plasma Diagnostics, Atlanta, Georgia, USA, June 2014.
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1063/1.4891165
Publisher 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.
Date accepted:01 July 2014
Date deposited:05 August 2014
Date of first online publication:01 August 2014
Date first made open access:No date available

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