Abstract
Graphite probes have been used to collect plasma particles in the scrape-off layer of the TEXTOR plasma. Collected particles have been analysed by thermal desorption and mass spectrometric detection. It has been found that collected hydrogen particle fluxes fall exponentially with increasing distance from the limiters. Typical decay lengths are in the order of 1 cm. Systematic differences in the amount of particles fluxes as well in the decay lengths have been observed between the ion and electron drift side of the probe, probably caused by differences in the connection lengths of the magnetic field lines. Initial experiments have been done to analyse the collected metals Cr, Fe and Ni by thermal desorption from graphite after exposure to the plasma scrape-off layer.
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