Abstract
Significant improvements have been achieved in the performances of the broadband reflectometry for the density profile measurements on Tore Supra. The frequency range of the former 50–75 GHz X-mode reflectometer has been extended with an additional device operating between 75 and 110 GHz. Both setups have ultrafast sweeping capabilities allowing full band measurements in 20 μs. The heterodyne detection and the intermediate frequency system have been upgraded to record beat frequencies up to 100 MHz with a signal to noise ratio of about 40 dB. The in phase and quadrature-type phase detection system (IQ detector) provides sine and cosine components of the received signal for a separate measurement of the phase and the amplitude. A new fast data acquisition system in Versa Module Europa format has been developed. It allows sampling frequency up to 200 MHz with 32 Mo memory capabilities per channel and 10 bit resolution digitizers. Edge profile measurements are now available for a wide range of toroidal magnetic fields (from 3 to 4 T).
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