Design of soft-X-ray tomographic system in WEST using GEM detectors

Didier Mazon, Maryna Chernyshova, Guillaume Jiolat, Tomasz Czarski, Philippe Malard, Ewa Kowalska-Strzeciwilk, Slawomir Jablonski, Waldemar Figacz, Roman Zagorski, Monika Kubkowska, Grzegorz Kasprowicz, Krzysztof Pozniak, Wojciech Zabolotny, Sébastien Larroque, Jean Marc Verger, Martin O'Mullane, Jan Mlynar, Adrian Byszuk, Andrzej Wojenski

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Abstract

In metallic tokamaks, the interplay between particle transport and MagnetoHydroDynamic (MHD) activity might lead to impurities accumulation and finally to disruption. Studying such phenomena is thus essential if stationary discharges are to be achieved. Measuring the soft X-ray (SXR) radiation ([0.1 keV; 20 keV]) of magnetic fusion plasmas is a standard way of accessing valuable information on particle transport and MHD. Generally, like at Tore Supra (TS), the analysis is performed with a 2D tomographic system composed of several cameras equipped with silicon barrier diodes (SBD). On WEST the installation of an upper divertor masks many of the actual TS vertical diodes so that no proper tomography is possible. This paper presents the design of a new SXR diagnostic for the WEST project developed in collaboration with IPPLM (Poland) and the Warsaw University of Technology, based on a triple gas electron multiplier (GEM) detector. Preliminary simulations performed to size and position the detector and its electronics inside the vertical thimble are also presented, in particular estimation of magnetic field and temperature variation affecting GEM spatial resolution and signal quality. As a conclusion, perspectives about tomographic capabilities of the new system for studying impurity transport are given.

Original languageEnglish
Pages (from-to)856-860
Number of pages5
JournalFusion Engineering and Design
Volume96-97
Early online date25 Apr 2015
DOIs
Publication statusPublished - 1 Oct 2015
Event28th Symposium on Fusion Technology (SOFT 2014) - San Sebastian, Spain
Duration: 29 Sep 20143 Oct 2014

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Keywords

  • gas detector
  • soft-X-ray
  • tokamak
  • tomography
  • WEST

Cite this

Mazon, D., Chernyshova, M., Jiolat, G., Czarski, T., Malard, P., Kowalska-Strzeciwilk, E., ... Wojenski, A. (2015). Design of soft-X-ray tomographic system in WEST using GEM detectors. Fusion Engineering and Design, 96-97, 856-860. https://doi.org/10.1016/j.fusengdes.2015.03.052