GEM-based plasma radiation diagnostics development: design aspects affecting its performance

Maryna Chernyshova; Karol Malinowski; Tomasz Czarski; Iraida N. Demchenko; Ewa Kowalska-Strzęciwilk; Paweł Linczuk; Krzysztof T. Poźniak; Grzegorz Kasprowicz; Wojciech Zabołotny; Andrzej Wojeński; Piotr Kolasiński; Rafał D. Krawczyk; Michał Gąska

doi:10.1117/12.2502232

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1 October 2018 GEM-based plasma radiation diagnostics development: design aspects affecting its performance

Maryna Chernyshova, Karol Malinowski, Tomasz Czarski, Iraida N. Demchenko, Ewa Kowalska-Strzęciwilk, Paweł Linczuk, Krzysztof T. Poźniak, Grzegorz Kasprowicz, Wojciech Zabołotny, Andrzej Wojeński, Piotr Kolasiński, Rafał D. Krawczyk, Michał Gąska

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Proceedings Volume 10808, Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2018; 108084F (2018) https://doi.org/10.1117/12.2502232
Event: Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2018, 2018, Wilga, Poland

Abstract

The advanced Soft X-ray (SXR) diagnostics setup devoted to studies of the SXR plasma emissivity focusing on the energy range of tungsten emission lines is at the moment a highly relevant and important for ITER/DEMO as W became a plasmafacing material and, therefore, plasma contamination by W and W transport in the plasma must be understood and monitored. The Gas Electron Multiplier (GEM) based SXR radiation detecting system under development by our group with a spatial and energy-resolved photon detecting chamber may become such a diagnostic setup; however, many physical, technical and technological aspects must be taken into consideration. This work presents the results of preliminary tests and simulations of the research into the optimal design of the detector’s internal chamber. The study of the influence of different GEM foils on the properties and distribution of the electron avalanche as well as the effect of the high rate photon flux on GEM foil performance was performed. Effect of electrodes alignment allowed choosing the gap distances which maximize electron transmission was also examined. Finally, the optimal readout structure design was identified suitable to collect a total formed charge effectively.

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Maryna Chernyshova, Karol Malinowski, Tomasz Czarski, Iraida N. Demchenko, Ewa Kowalska-Strzęciwilk, Paweł Linczuk, Krzysztof T. Poźniak, Grzegorz Kasprowicz, Wojciech Zabołotny, Andrzej Wojeński, Piotr Kolasiński, Rafał D. Krawczyk, and Michał Gąska "GEM-based plasma radiation diagnostics development: design aspects affecting its performance", Proc. SPIE 10808, Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2018, 108084F (1 October 2018); https://doi.org/10.1117/12.2502232

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