Speaker
Maryna Chernyshova
(Institute of Plasma Physics and Laser Microfusion)
Description
Necessity to develop new diagnostics for poloidal tomography focused on the metal impurities radiation monitoring, especially tungsten emission, has become recently inevitable. Tungsten is now being used for the plasma facing material on many machines, including on the WEST project, where an actively cooled tungsten divertor is being implemented. This forced a creation of the ITER-oriented research programs aiming to effectively monitor the impurity level of tungsten in plasma. The situation is even more complicated as, due to interaction between particle transport and MHD activity, such impurities might accumulate which could lead to disruption, especially, in case of long pulse tokamaks. Therefore, an appropriate diagnostic tool has to be developed which will not just monitor the level of impurity but will also reconstruct its distribution. Combining the spectral information on plasma radiation with good spatial resolution of its detection should allow recovering fundamental information in order to estimate the level of the plasma contamination and consider its effects on plasma scenarios. Detection system based on Gas Electron Multiplier technology has been recently proposed to be used as SXR tomographic system for ITER-oriented tokamaks and is under development by our group. This work presents the current status of design of the detecting system for poloidal tomography to be installed at WEST project tokamak for the verification of the detecting concept. The detecting system consists of two detectors which are expected to be installed in a poloidal section of the WEST project tokamak – one of planar and other of cylindrical geometry. In order to study the characteristics of the detectors and verify the proposed design first laboratory tests of the constructed detectors were performed. The results of the laboratory measurements with the 55Fe source and X-ray tube will be shown demonstrating various detector characteristics such as energy, spatial and time resolution.
Co-authors
Andrzej Wojenski
(Warsaw University of Technology, 15/19 Nowowiejska Street, 00-665 Warsaw, Poland)
Ewa Kowalska-Strzeciwilk
(Institute of Plasma Physics and Laser Microfusion, 23 Hery Street, 01-497 Warsaw, Poland)
Grzegorz Kasprowicz
(Warsaw University of Technology, 15/19 Nowowiejska Street, 00-665 Warsaw, Poland)
Karol Malinowski
(Institute of Plasma Physics and Laser Microfusion, 23 Hery Street, 01-497 Warsaw, Poland)
Krzysztof T. Pozniak
(Warsaw University of Technology, 15/19 Nowowiejska Street, 00-665 Warsaw, Poland)
Maryna Chernyshova
(Institute of Plasma Physics and Laser Microfusion, 23 Hery Street, 01-497 Warsaw, Poland)
Piotr Kolasinski
(Warsaw University of Technology, 15/19 Nowowiejska Street, 00-665 Warsaw, Poland)
Rafal Krawczyk
(Warsaw University of Technology, 15/19 Nowowiejska Street, 00-665 Warsaw, Poland)
Tomasz Czarski
(Institute of Plasma Physics and Laser Microfusion, 23 Hery Street, 01-497 Warsaw, Poland)
Wojciech Zabolotny
(Warsaw University of Technology, 15/19 Nowowiejska Street, 00-665 Warsaw, Poland)
