Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.00 vteřin. 
Infrared measurements in medium and long wavelength on COMPASS
Vondráček, Petr ; Horáček, Jan ; Pánek, Radomír ; Gauthier, E.
The experimental study of radial profiles of parallel heat flux in the scrape-off layer (SOL) of the COMPASS tokamak shows a systematic discrepancy between medium (MWIR) and long (LWIR) wavelength infrared (IR) thermographic measurements. Significant temperature and heat flux overestimation is observed in the MWIR range, whilst the LWIR range is almost not affected. It is assumed to be caused by a presence of dust particles creating sub-pixel sized micro hot-spots. Significant inhomogeneity of the surface conditions across the limiter is observed, resulting in local disturbance of the derived heat flux profiles (decay length variation up to ~ few tens of percent). Influence of the inhomogeneously distributed micro hot-spots is suppressed using correction factors (the heat transmission coefficient α) for each pixel separately in the heat flux calculation. Procedure of the α coefficient estimation is described.
Parallel Heat Flux Decay Length Study in the COMPASS Tokamak Using MWIR and LWIR Cameras
Vondráček, Petr ; Horáček, Jan ; Pánek, Radomír ; Gauthier, E.
A comprehensive study of a parallel heat flux in a tokamak scrape-off layer (SOL) has been performed in the COMPASS tokamak recently. Specially shaped high field side (HFS) limiter was used to estimate a heat flux radial decay length for small limiter radial misalignment. Long wavelength IR microbolometer and medium wavelength IR InSb camera were used for this purpose. This paper compares results obtained by the means of both cameras and demonstrates observation of very narrow heat flux decay length close to the last closed flux surface (LCFS) independantly on used camera.

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