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link:http://dx.doi.org/+10.1063/1.4740512 A diagnostic technique
based on the Cherenkov effect is proposed for detection and
characterization of fast (super-thermal and runaway) electrons
in fusion devices. The detectors of Cherenkov radiation have
been specially designed for measurements in the ISTTOK tokamak.
Properties of several materials have been studied to determine
the most appropriate one to be used as a radiator of Cherenkov
emission in the detector. This technique has enabled the
detection of energetic electrons (70 keV and higher) and the
determination of their spatial and temporal variations in the
ISTTOK discharges. Measurement of hard x-ray emission has also
been carried out in experiments for validation of the measuring
capabilities of the Cherenkov-type detector and a high
correlation was found between the data of both diagnostics. A
reasonable agreement was found between