Speaker
Petr Vondracek
(Institute of Plasma Physics of the CAS)
Description
A new fast infrared camera Telops FAST-IR 2K was purchased on the COMPASS tokamak recently. It is equipped with a MWIR (medium wavelength infrared, 3-5 μm) InSb detector and is possible to reach framerate of 1.917 kHz in a full frame acquisition mode (320x256 px.) and up to 90 kHz in a sub-windowed acquisition (64x4 px.).
The camera allows e.g. automatic exposure control, providing autonomous real-time control of an optimal exposure time to reach requested detector's well filling, and other advanced acquisition control and data processing capabilities.
The camera will be part of a new fast divertor thermography system with exceptional spatial resolution (~ 0.6-1.1 mm/px. on the target plane, 0.04-0.12 mm/px. mapped to the outer midplane) with a possibility of measurements of radial profiles on divertor with 320x4 px. with a time resolution better than 20 µs.
First experimental measurements of heat fluxes to the IWL (inner wall limiter) of the COMPASS tokamak using the new camera are presented as well as observations of the inner divertor region with exceptional temporal resolution. A design of the foreseen optical system for observations of the divertor region is described together with a design of a special divertor graphite tile used for the IR thermography, that will allow in-situ surface emissivity calibration.
Co-authors
Eric Gauthier
(CEA/DSM/IRFM, CEA Cadarache, Saint-Paul-les-Durance, France)
Petr Vondracek
(Institute of Plasma Physics of the CAS, Prague, Czech Republic;Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic)
Radomir Panek
(Institute of Plasma Physics of the CAS, Prague, Czech Republic)
