New developments of self-emitting electrostatic probes for use in high temperature plasmas

Emissive electrostatic probes for the use in fusion experiments must be able to sustain significantly higher thermal loads than in low-temperature plasma experiments. Several types of probe design are discussed, the results from the use of such probes in the edge plasma of the Wendelstein 7-AS stellarator are presented and compared with the predictions of emissive and non-emissive probe models. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.