Flush-mounted probes in the divertor plates of Tokamak de Varennes

Arrays of 12 flush-mounted Langmuir probes have been installed in both the upper and lower outboard divertor plates of TdeV (Tokamak de Varennes). Measurements of electron temperature and density are obtained using a novel method of analysis which assumes that charge collection is dominated by the finite size of the electrostatic sheath. The technique is validated by comparing measurements from a cylindrical and a flush probe which are operated simultaneously in the same plasma.