1. T E CT E C Euratom-FOM Erosion and deposition of C in Pilot-PSI Gerard van Rooij The Pilot-PSI and Magnum-PSI team: J. Westerhout, G. Wright, W.A.J. Vijvers, A.E. Shumack, H.J. van der Meiden, R.S. Al, H.J.N. van Eck, B. de Groot, W.R. Koppers, M.J. van de Pol, P.R. Prins, L.W. Veldhuizen, A.W. Kleyn, W.J. Goedheer, N.J. Lopes C : D.G. Whyte : R. Engeln, D.C. Schram : Forschungszentrum Jülich (TEC): S. Brezinsek T E CT E C Association Euratom-FOM

2. T E CT E C Euratom-FOM 2 GvR @ ITPA, Garching, May 2007 Experimental: Pilot-PSI Source Target B Coils pumps

3. T E CT E C Euratom-FOM 3 GvR @ ITPA, Garching, May 2007 Experimental: Diagnostics CH spectroscopy Target Calorimetry on cooling water Thomson Scattering at 17 mm in front of target

4. T E CT E C Euratom-FOM 4 GvR @ ITPA, Garching, May 2007 Experimental: target exposure

5. T E CT E C Euratom-FOM 5 GvR @ ITPA, Garching, May 2007 Results: TS and Spectroscopy Radius (mm) 010-10 Radius (mm) 010-10 T e (eV) 0 1 n e (10 21 m -3 ) 0 1

6. T E CT E C Euratom-FOM 6 GvR @ ITPA, Garching, May 2007 Results: conditions at target experimental settings determine conditions reproducibly!

7. T E CT E C Euratom-FOM 7 GvR @ ITPA, Garching, May 2007 Results: erosion/deposition profile 20 0 -20 -40 Height (µm) 5 10 15 20 Position (mm) 10 mm

8. T E CT E C Euratom-FOM 8 GvR @ ITPA, Garching, May 2007 Results: erosion/deposition profile Erosion 0.94 mm 3 Deposition 0.47 mm 3 50% redeposition (Vol.%!) 20 0 -20 -40 Height (µm) 5 10 15 20 Position (mm) ~ 150 μm

9. T E CT E C Euratom-FOM 9 GvR @ ITPA, Garching, May 2007 Results: comparing, T surf and P target 30 mm 4 mm C 1.6 mm TC C target

10. T E CT E C Euratom-FOM 10 GvR @ ITPA, Garching, May 2007 Results: Chemical erosion rate 600 K 1400 K CH band surface temp. dependence according to Roth formula CH intensity normalized to total flux

11. T E CT E C Euratom-FOM 11 GvR @ ITPA, Garching, May 2007 Conclusions Exposures at flux densities of 1-5·10 24 m -2 s -1 demonstrated Calculated sheath flux agrees with power to target Flux density sets surface temperature up to ~1400 K Up to 50 vol.% redeposition observed (Preliminary) chemical erosion yield drops by factor 50 by elevating surface temperature from 600 to 1400 K