Abstract
A multigrid energy analyzer was used to measure the ion temperature in the scrape-off layer of DIVA, where the plasma parameters were relatively high, i.e. electron and ion temperatures Te and Ti\\lesssim60 eV; electron density ne\\lesssim5×1012 cm-3; heat flux q\\lesssim2 kW/cm2. It was found that to obtain the true ion temperature, the bias voltage VE of the entrance apertures of the analyzer must be chosen so as to satisfy the criterion e|VS-VP|≪Ti, where VS and VP are the plasma potentials before and after the entrance apertures, respectively. The data were consistent with those obtained by other methods, i.e. the Doppler broadening of impurity lines and the Katsumata probe (ion-sensitive probe).
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