Eroded copper fluxes from the target plates in the ASDEX divertor have been measured spectroscopically. The measuring method is outlined and comprehensive experimental material for various modes of tokamak operation is presented. Assuming thermal sputtering to be the only erosion process, good agreement is found between the code predictions and the measurements.
We give an overview of the different confinement regimes observed on ASDEX and compare the changes during the transition phases with qualitative tendencies suggested by theoretical models. The transitions discussed are those between purely Ohmic heating and additional heating in the L-regime, between the Land the H-regime, and between discharges with flat and peaked electron density profiles.
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