TY - JOUR
T1 - Design of soft-X-ray tomographic system in WEST using GEM detectors
AU - Mazon, Didier
AU - Chernyshova, Maryna
AU - Jiolat, Guillaume
AU - Czarski, Tomasz
AU - Malard, Philippe
AU - Kowalska-Strzeciwilk, Ewa
AU - Jablonski, Slawomir
AU - Figacz, Waldemar
AU - Zagorski, Roman
AU - Kubkowska, Monika
AU - Kasprowicz, Grzegorz
AU - Pozniak, Krzysztof
AU - Zabolotny, Wojciech
AU - Larroque, Sébastien
AU - Verger, Jean Marc
AU - O'Mullane, Martin
AU - Mlynar, Jan
AU - Byszuk, Adrian
AU - Wojenski, Andrzej
PY - 2015/10/1
Y1 - 2015/10/1
N2 - 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.
AB - 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.
KW - gas detector
KW - soft-X-ray
KW - tokamak
KW - tomography
KW - WEST
UR - http://www.scopus.com/inward/record.url?scp=84942831504&partnerID=8YFLogxK
UR - http://www.sciencedirect.com/science/article/pii/S0920379615002215
UR - http://www.soft2014.eu/
U2 - 10.1016/j.fusengdes.2015.03.052
DO - 10.1016/j.fusengdes.2015.03.052
M3 - Conference Contribution
AN - SCOPUS:84942831504
SN - 0920-3796
VL - 96-97
SP - 856
EP - 860
JO - Fusion Engineering and Design
JF - Fusion Engineering and Design
T2 - 28th Symposium on Fusion Technology (SOFT 2014)
Y2 - 29 September 2014 through 3 October 2014
ER -