Infrared measurements in medium and long wavelength on COMPASS

0468466 - ÚFP 2017 RIV CZ eng C - Conference Paper (international conference)
Vondráček, Petr - Horáček, Jan - Pánek, Radomír - Gauthier, E.
Infrared measurements in medium and long wavelength on COMPASS.
Proceedings of the 25th Annual Conference of Doctoral Students – WDS 2016. Prague: MATFYZPRESS Prague, 2016 - (Šafránková, J.; Pavlů, J.), s. 161-165. WDS´. ISBN 978-80-7378-333-4.
[WDS´2016 - 25th Annual Student Conference Week of Doctoral Students 2016. Prague (CZ), 07.06.2016-09.06.2016]
R&D Projects: GA MŠMT(CZ) LM2015045; GA MŠMT(CZ) 8D15001
Institutional support: RVO:61389021
Keywords : IR * MWIR * LWIR * Dust * COMPASS * SOL
Subject RIV: BL - Plasma and Gas Discharge Physics
http://www.mff.cuni.cz/veda/konference/wds/proc/proc-contents.php?year=2016

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.
Permanent Link: http://hdl.handle.net/11104/0266314