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P: Plasmaphysik

P 26: Diagnostik 3

P 26.3: Talk

Wednesday, March 29, 2006, 17:30–17:45, 1002

Ultra fast camera system for observations in the visible range at TEXTOR — •Sergey Bozhenkov, Michael Lehnen, and Robert Wolf — Institut fuer Plasmaphysik, Forschungszentrum Juelich GmbH, Association EURATOM-FZJ, Trilateral Euregio Cluster, 52425, Juelich, Germany

2D observation of fast processes with good spatial resolution is important in understanding physics of many processes taking place in tokamak plasma. Disruptions, pellet injection or turbulent transport can be considered as prominent examples of such processes. For these measurements new ultra fast camera system has been recently installed at TEXTOR. The camera has resolution 64 x 64 pixels and runs at frame rates up to 500 kHz. In one shot maximum 300 frames can be taken. For observation of faint events the camera is also equipped with a generation III image intensifier serving at the same time as a fast shutter. In the present report results of the calibration are discussed. Following system characteristics were investigated: frame rate, exposure time, linearity of the response of the camera and image intensifier, phosphor decay time and uniformity of the sensitivity. First measurements during disruptions with massive gas injection at TEXTOR are shown.