PSI research in the ITER divertor parameter range at the FOM PSI-lab

FOM-Rijnhuizen is building, in cooperation with its Trilateral Euregio Cluster (TEC) partners, a PSI-laboratory to study plasma surface interaction (PSI) under extreme, ITER relevant plasma conditions. The largest linear plasma generator of PSI-lab is Magnum-PSI, and is designed to deliver up to 10 MW m(-2) power over a 10 cm diameter hydrogen plasma beam with an electron density (n(e)) up to 10(21) m(-3) and electron- temperature (T-e) between 1-5 eV. Magnum-PSI is presently under construction and its predesign is presented. Its forerunner is Pilot-PSI, in which record plasma parameters of n(e) = 4 x 10(21) m(-3) at T-e = 2 eV in a similar to 1 cm wide hydrogen beam confined by a magnetic field (B) 10(21) m(-3) and T-e <= 4 eV have been demonstrated. Initial experiments on exposing fine-grain carbon samples are presented that showed up to 20 mu m s(-1) erosion as a demonstration of the extreme plasma conditions. Spectroscopy was applied to compare chemical erosion yields for flux densities up to 5.0 x 10(24) m(-2) s(-1)