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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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Rekonstrukce magnetické rovnováhy v tokamaku
Havlíček, Josef ; Urban, Jakub
Equilibrium reconstruction determines the plasma shape, the current profile and pressure profile parameters in tokamaks. It is based on solving Grad-Shafranov equation describing MHD equilibrium in axially symmetric devices. This paper reports on the principles of the EFIT code and on the parallelization of the EFIT2006 code.
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Vývoj meziplanetární rázové vlny v přechodové oblasti
Koval, A. ; Šafránková, J. ; Němeček, Z. ; Přech, L. ; Hayosh, Mykhaylo
Propagation of an interplanetary shock through the solar wind and magnetosheath is studied. The data from spacecraft allows determining both local and global shock planes and shock propagation speeds in the solar wind as well as local shock parameters in the magnetosheath. A mutual comparison of these parameters indicates that the shock front decelerates and curves in the magnetosheats. Magnetic field and plasma parameters are well reproduced by 3D MHD BARTS-R-US model.
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