FOM PSIresearch PilotPSI

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FOM PSI-researchPilot-PSI Magnum-PSI teamJ.
Westerhout, W.A.J. Vijvers, H.J.N. van Eck, A.
Shumack, Gerard van Rooij, W.R. Koppers, W.J.
Goedheer, H.J. van der Meiden, M.J. van de Pol,
M. Baeva, R.S. Al, B. de Groot,, S. Brons, P.R.
Prins, P.H.M. Smeets, J. Scholten,A.W. Kleyn,
N.J. Lopes CardozoFZJ Jülich PSI-team, esp S.
Brezinsek, B. SchweerR. Engeln, D.C. Schram,
Eindhoven University of TechnologyD.G. Whyte,
MITR. Koch, KMS/ERMG. Popa, Costin, Romania
FOM-Institute for Plasma Physics
Rijnhuizen Association Euratom-FOM
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PSI-lab at FOM
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FOM PSI-programme

• FOM PSI programme
• Design and construction of Magnum-PSI
• Research programme on Pilot-PSI
• Modelling

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• FOM PSI programme
• Design and construction of Magnum-PSI
• Project on schedule. Magnet ordered. Hall
  rebuilt. Vacuum system designed, Target
  manipulator being designed...
• Research programme on Pilot-PSI
• At target n 2.1021 m-3 at T2 eV. Erosion of
  carbon.
• In support of Magnum-PSI development of source
  and rf heating Physics of plasma jet.
• Modelling
• Suite of codes Plasimo Gas dynamics -
  B2-Eirene - MD
• Study of Magnum-PSI and Pilot-PSI plasmas.

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Magnum-PSI
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Magnum-PSI
Start commissioning Jan 2009
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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 at B0.4
T ? this is gt10 MW/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 m-3, 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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Pilot exposures, insufficient cooling of target
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B2-Eirene runs for Magnum-PSI
M. Baeva Studies of detachment in Magnum-PSI,
recycling at surface
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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

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Conclusions

• Magnum-PSI on track, operation in 2009
• Pilot-PSI offers ion and power flux densities
  relevant to ITER divertor studies
• Modelling connecting basic processes, experiments
  to tokamak application
• Collaboration on these devices welcomed.

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propects

• Magnum-PSI. project/milestones
• Pilot-PSI.
• test larger source in Pilot-PSI
• erosion studies carbon
• erosion studies tungsten
• exposure studies for ITER diagnostics
• physics of plasma jet, physics of source