PSI spectroscopy of hydrocarbons and erosion in Pilot-PSI Gerard van Rooij Pilot & Magnum team: J. Westerhout, W.A.J. Vijvers, R.S. Al, H.J.N. van Eck,

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Presentation transcript:

PSI spectroscopy of hydrocarbons and erosion in Pilot-PSI Gerard van Rooij Pilot & Magnum team: J. Westerhout, W.A.J. Vijvers, R.S. Al, H.J.N. van Eck, B. de Groot, W.R. Koppers, H.J. van der Meiden, P.R. Prins, M.J. van de Pol, P.H.M. Smeets, J. Scholten, W.J. Goedheer, A.W. Kleyn, N.J. Lopes Cardozo S. Brezinsek, FZJ Jülich R. Engeln, D.C. Schram, Eindhoven University of Technology D.G. Whyte, MIT FOM-Institute for Plasma Physics Rijnhuizen Association Euratom-FOM

2 Pilot-PSI: experimental Arc Coils Thomson Scattering Target Spectroscopy Coils Arc Thomson Scattering Spectroscopy H2H2 cathode anode plasma 0.55 m

3 Density and temperature near the target 532nm Scattered light analyzed spectrally and spatially resolved 17 mm Thomson Scattering at 17 mm from target

4 Parameter range at target realized in Pilot >10 23 H + /m 2 s>10 24 H + /m 2 s>10 25 H + /m 2 s  ion = 0.6· n e · c s,i (T e ) Experimental knobs: Source current & flow Vessel pressure Magnetic field Target potential

5 Target calorimetry confirms flux from n e,T e Measured in target cooling water: 1.0 kW  this is 10 MW/m 2 ! 100 s exposure = H + /m 2 !!! Integration of flux profile for B = 0.4 T gives total  ion :  ion = 3.2·10 20 H + /s  this is 40% of input gas flow! Flux corresponds to 1.0 kW power (assuming E ion +E diss +5/2 k(T e +T i ) )

6 Exposure of carbon to H + /m 2 Target 5mm x  30mm, fine grain, Carbon SGL Group, R 6650 Power to target cooling water: 0.9 kW Thomson scattering: n e = 9±1·10 19, T e = 4.0 ± 0.2 eV 100 sec exposure time Target grounded: 50 A net current Auger spectroscopy shows no target contamination IR spectrum indicates no excessive surface temp. Eroded crater < 5  m; agrees with Y chem and no redeposition (~4  m)

7 Y chem from spectroscopy spectrometer target HH HH CH (Hydkin) (ADAS) H

8 Pilot exposures compared to the Y chem curve To be considered:Calibration required by CH 4 puffing Surface temperature unknown

9 Conclusions Pilot-PSI offers >10 26 H + /m 2 exposures at n e up to 2·10 21 m -3 and T e up to 4 eV First Y chem determinations based on spectroscopy demonstrated for >10 24 H + /m 2 s; in line with literature