Collector probe measurements in T-10: Results and prospects

Results of collector probe exposures in the tokamak scrape-off with subsequent surface analysis are presented. Most of the experiments were carried out at T-10 using the WASA-I device. The significance of the measurements was improved by combining the collector probe technique with impurity injection methods as well as with Langmuir probe measurements. The results are discussed in terms of general aspects of probe measurements in tokamaks considering the perturbation of the plasma by the probe and the erosion/deposition balance on the sample surface. Problems arising for tokamak and probe operation from the use of different materials for the inner components of the tokamak vessel or an ''all carbon'' tokamak are dealt with. The future work is outlined. (orig.)