Design and tests of Cherenkov detector for measurements of fast electrons within Castor tokamak

The paper concerns a novel diagnostic technique applicable for indirect, spatially resolved measurements of energetic electrons generated inside tokamak-type facilities. Such measurements can be performed making use of the Cherenkov-effect induced by fast electrons inside a transparent medium (radiator). A construction of the Cherenkov-type detectors adapted for tokamak research is presented and preliminary results of the first measurements carried out within the CASTOR tokamak operated at IPP in Prague are reviewed.