We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.

Durham Research Online
You are in:

Development of an 11-channel multi wavelength imaging diagnostic for divertor plasmas in MAST Upgrade

Feng, X. and Calcines, A. and Sharples, R. M. and Lipschultz, B. and Perek, A. and Vijvers, W. A. J. and Harrison, J. R. and Allcock, J. S. and Andrebe, Y. and Duval, B. P. and Mumgaard, R. T. (2021) 'Development of an 11-channel multi wavelength imaging diagnostic for divertor plasmas in MAST Upgrade.', Review of Scientific Instruments, 92 (6). 063510.


Divertor detachment and alternative divertor magnetic geometries are predicted to be promising approaches to handle the power exhaust of future fusion devices. In order to understand the detachment process caused by volumetric losses in alternative divertor magnetic geometries, a Multi-Wavelength Imaging (MWI) diagnostic has recently been designed and built for the Mega Amp Spherical Tokamak Upgrade. The MWI diagnostic will simultaneously capture 11 spectrally filtered images of the visible light emitted from divertor plasmas and provide crucial knowledge for the interpretation of observations and modeling efforts. This paper presents the optical design, mechanical design, hardware, and test results of an 11-channel MWI system with a field of view of 40°. The optical design shows better than 5 mm FWHM spatial resolution at the plasma on all 11 channels across the whole field of view. The spread of angle of incidence on the surface of each filter is also analyzed to inform the bandwidth specification of the interference filters. The results of the initial laboratory tests demonstrate that a spatial resolution of better than 5 mm FWHM is achieved for all 11 channels, meeting the specifications required for accurate tomography.

Item Type:Article
Full text:(AM) Accepted Manuscript
Download PDF
Full text:(VoR) Version of Record
Available under License - Creative Commons Attribution 4.0.
Download PDF
Publisher Web site:
Publisher statement:© 2021 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (
Date accepted:19 May 2021
Date deposited:23 August 2021
Date of first online publication:09 June 2021
Date first made open access:23 August 2021

Save or Share this output

Look up in GoogleScholar