PSI spectroscopy of hydrocarbons and erosion in Pilot-PSI Gerard van Rooij Pilot

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PSI spectroscopy of hydrocarbons and erosion in
Pilot-PSIGerard van RooijPilot Magnum
teamJ. 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 CardozoS. Brezinsek, FZJ
Jülich R. Engeln, D.C. Schram, Eindhoven
University of TechnologyD.G. Whyte, MIT
FOM-Institute for Plasma Physics
Rijnhuizen Association Euratom-FOM
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Pilot-PSI experimental
Coils
0.55 m
Target
Arc
Thomson Scattering
Spectroscopy
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Density and temperature near the target
532nm
Thomson Scattering at 17 mm from target
17 mm
Scattered light analyzed spectrally and
spatially resolved
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Parameter range at target realized in Pilot
gt1023 H/m2s
gt1024 H/m2s
gt1025 H/m2s

• Gion 0.6 ne cs,i(Te)
• Experimental knobs
• Source current flow
• Vessel pressure
• Magnetic field
• Target potential

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Target calorimetry confirms flux from ne,Te
Measured in target cooling water 1.0 kW ?
this is 10 MW/m2 !
100 s exposure 1027 H/m2 !!!
Integration of flux profile for B 0.4 T gives
total Gion Gion 3.21020 H/s ? this is
40 of input gas flow! Flux corresponds to 1.0
kW power (assuming EionEdiss5/2 k(TeTi) )
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Exposure of carbon to 1026 H/m2

• Target 5mm x ?30mm, fine grain, Carbon SGL Group,
  R 6650
• Power to target cooling water 0.9 kW
• Thomson scattering ne 911019, Te 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 lt 5 mm
• agrees with Ychem and
• no redeposition (4 mm)

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Ychem from spectroscopy
Hg
CH
Hd
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Pilot exposures compared to the Ychem curve
To be considered Calibration required by CH4
puffing Surface temperature unknown
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Conclusions

• Pilot-PSI offers gt1026 H/m2 exposures at ne up
  to 21021 m-3 and Te up to 4 eV
• First Ychem determinations based on
• spectroscopy demonstrated for
• gt1024 H/m2s in line with literature