Experiments on Fusion relevant devices

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Experiments on Fusion relevant devices
G. Popa, C. Costin, M. L. Solomon, V. Anita, L.
Sirghi, C. Lupu, S. Teodoru, C.
Agheorghiesei Faculty of Physics, Al. I. Cuza
University Association EURATOM-MEdC, Iasi,
Romania
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Main objective
Investigations on edge plasmas
Castor Tokamak (IPP Prague)
Pilot-PSI (FOM)
electrical methods
plasma parameters
PWI Task Force
essential data
Erosion, transport and deposition of low-Z wall
materials
Fuel retention
Dust generation
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Main objective

• Plasma parameters (Vp, Ti, I0i)
• Plasma-wall energy transfer (heat load)
• Plasma-wall particle transfer (particle fluxes)
• Wall/divertor erosion

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Collaborations
J. Stöckel, J. Adamek, M. Kocan, J.
Brotankova Institute of Plasma Physics
Association EURATOM-IPP.CZ, Prague, Czech
Republic R. S. Al, B. de Groot, W. Goedheer,
N. J. Lopes Cardozo,H. J. van der Meiden, G. J.
van Rooij, J. Westerhout, J. Rapp FOM-Institute
for Plasma Physics Rijnhuizen Association
EURATOM-FOM, Nieuwegein, The Netherlands R.
Schrittwieser, C. Ionita, R. Stärz, S. Kuhn, D.
Tskhakaya jr. Theoretical Plasma Physics Group
Department for Ion Physics Association
EURATOM-ÖAW, Innsbruck University, Austria
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Castor Tokamak

• R 40 cm
• a 8.5 cm
• B 1.2 T
• Ip 10 kA
• background pressure
• lt 10-4 Pa
• operating H2 pressure
• 10-2 Pa
• t 30 ms
• ltnegt 1019 m-3
• ne 1018 m-3 in SOL

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Castor Tokamak
Plasma potential measurements
Katsumata probe - schematic representation
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Castor Tokamak
Plasma potential measurements
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Castor Tokamak
Ion temperature measurements

• Collector and screening tube biased between
  -100 V and 100 V, around a DC offset, at 300 Hz.
  
• -Two different collector positions, h -0.5,
  -0.3 mm.

Typical I-V characteristic of the collector (h
-0.5 mm, r 80 mm)
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Castor Tokamak
Ion temperature measurements
Radial profile of ion temperature for collector positions h -0.5 and -0.3 mm Ion temperature measured with Katsumata and Tunnel probe
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Castor Tokamak
Diffusion coefficient measurements
Power spectra fluctuations for different
collector position h mm (r  65 mm)
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Castor Tokamak
Diffusion coefficient measurements
Radial decay of spectrum at 10 different
frequencies
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Castor Tokamak
Diffusion coefficient measurements
Measured diffusion coefficient - black
points Bohm diffusion coefficient (x 3.5) -
red line
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Pilot - PSI
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Pilot - PSI
Gas Ar, Ar H2, H2 Gas flow
12 slm 1 slm 4.481020 molec/s Source
current IS 80150 A Gas pressure p
15 Pa Magnetic field strength B
0.41.2 T
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Pilot - PSI
B 0 T
B 0.4 T
H2 Ar
Ar
H2
H2
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Pilot - PSI
Plasma potential radial profile
- emissive and cold probes
B 0.4 T
H2 Id 120 A, p 1.6 Pa
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Pilot - PSI
Ar and H2 p 3.1 Pa, Qv 2 slm
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Pilot - PSI
Azimuthal drifts
Electric drift
Diamagnetic drift
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Pilot - PSI
Azimuthal drifts
OES
Measurements of Ha line (neutrals rotation)
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Pilot - PSI
Multi-Channel Analyzer (MCA)
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Pilot - PSI
Multi-Channel Analyzer (MCA)
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Pilot - PSI
Multi-Channel Analyzer (MCA)
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Conclusions

• Plasma diagnostic experiments on Castor Tokamak
  and Pilot-PSI
• Multi channel analyzer, electrostatic probes
  cold (Langmuir), emissive, Katzumata
• Measurements of plasma parameters plasma
  potential, ion temperature, ion flux, plasma
  diffusion coefficient

Essential data for PWI
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Conclusions
Communicated results (2005-2009) ISI Articles
5 Conferences 11 Workshops 5
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Future plans
COMPASS tokamak IPP ASCR, Prague
Major radius 56 cm Minor radius 20
cm Plasma current lt 350 kA Magnetic field
0.8 2.1 T Pulse length lt 1 s
December 9, 2008 first plasma February 19, 2009
official start of tokamak operation
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Future plans
Magnum-PSI FOM, The Netherlands
Pulse duration steady-state
operation Magnetic field 3 T, variable Beam
diameter 10 cm, variable Pressure at
target 3 Pa Plasma heating up to 3 eV
(Ohmic Helicon wave) Particle flux density
up to 1024 hydrogen ions m-2s-1 Energy flux
density up to 10 MW/m2 Surface analysis
in situ
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Future plans
FUSENET - The European Fusion Education Network

• Purpose
• increase, enhance, and broaden fusion training
• and education activities in Europe
• 48 months, started the 1st of October 2008
• Total budget of 2,000 k
• 36 participants from 18 countries
• 22 Universities
• 14 Euratom Associations