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Navrh filtru pro detekci Thomsonovym rozptylem na tokamaku COMPASS
Aftanas, Milan ; Scannell, R. ; Bílková, Petra ; Böhm, Petr ; Weinzettl, Vladimír ; Walsh, M.
Reinstalled tokamak COMPASS, originally from Culham Science Centre, is now operating at the Institute of Plasma Physics, Prague and many new optical diagnostics are being developed [Sestak et al, 2009]. For measurement of electron temperature and density profiles, high resolution incoherent Thomson scattering spectroscopy based on Nd:YAG laser and avalanche photodiodes is under development now. The paper outlines part of the design of this diagnostic - proper choice of spectral filters. The design of filters is shown and its evaluation taking into account different angle of scattered light is introduced. Error bars of the electron temperature, density and pressure are determined with respect to assumed electron temperature and density profiles and to required high spatial resolution at the pedestal region.
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Odhad zareni z plazmatu v systemu Thomsonova rozptylu projektovaneho pro tokamak COMPASS
Aftanas, Milan ; Böhm, Petr ; Weinzettl, Vladimír ; Stöckel, Jan
The COMPASS tokamak, originally from Culham laboratory, UKAEA, has been reinstalled at at Institute of Plasma Physics, Prague. Many innovations will be done and new diagnostics have to be constructed. Electron temperature Te and density ne as as key parameters of fusion plasma will be measured directly by the newly designed high spatial resolution incoherent Thomson scattering (TS) system. Several construction options of TS are considered. In this paper these options are discussed from a point of view of data analysis and estimation of background radiation.
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Využití lavinových fotodiod pro diagnostiku Thomsonova rozptylu na tokamacích
Aftanas, Milan ; Bělský, Petr ; Böhm, Petr ; Weinzettl, Vladimír ; Brotánková, Jana ; Barth, R. ; van der Meiden, H.
The COMPASS tokamak, originally from UKAEA, Culham laboratory, U.K., will be reinstalled at Institute of Plasma Physics, Prague. The scientific programme is focused mainly on the investigation of the edge plasma region with high temperature and density gradients called pedestal. Many innovations will be done and new diagnostics have to be constructed. One of the key diagnostics is an incoherent Thomson scattering for measurements of electron temperature Te and density ne with a high spatial resolution. In this paper a possibility of using a Nd:YAG laser in combination with a detection system based on Avalanche Photodiodes is discussed.
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Nový systém s vysokým rozlišením pro měření Thomsonova rozptylu na tokamaku COMPASS
Brotánková, Jana ; Bělský, Petr ; Weinzettl, Vladimír ; Böhm, Petr ; Barth, R. ; van der Meiden, H.
Thomson Scattering (TS) is a powerful technique capable to measure electron temperature and electron density. For TS on the COMPASS tokamak, several possible systems were considered and relevant parameters were calculated for both edge and core plasma studies. To attain the expected values of electron density and temperature, two possibilities were chosen to be the most suitable: (i) Nd-YAG laser at the second harmonic frequency with Littrow spectrometers with ICCD cameras (for both core and edge systems), and (ii) Nd-YAG laser at the first harmonic frequency with Littrow spectrometer with CMOS camera (for the core) and spectral filters with APDs (for the edge).
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Nová diagnostika pomocí Thomsonova rozptylu pro tokamak COMPASS
Aftanas, Milan ; Bělský, Petr ; Böhm, Petr ; Weinzettl, Vladimír ; Brotánková, Jana ; Barth, R. ; van der Meiden, H.
The COMPASS tokamak, originally from UKAEA, Culham laboratory, U.K., will be reinstalled at Institute of Plasma Physics, Prague. The scientific programme is focused mainly on the investigation of the edge plasma region with high temperature and density gradients called pedestal. Many innovations will be done and new diagnostics have to be constructed. One of the key diagnostics is an incoherent Thomson scattering for measurements of electron temperature Te and density ne with a high spatial resolution. Several construction options are considered. In this paper a possibility of using a Nd:YAG laser in combination with a detection system based on Avalanche Photodiodes is discussed.
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Plasma and plasma sphere
Weinzettl, Vladimír
The article introduces the term "plasma" and a history and present status of a research of plasma. In the second part of the article, the "plasma sphere" experiment is described, i.e. the experiment of a high frequency discharge in a gas.
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