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Experiments on Fusion relevant devices

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. Main objective. Investigations on edge plasmas. Castor Tokamak

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Experiments on Fusion relevant devices

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  1. 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

  2. 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 depositionof low-Z wall materials Dust generation Fuel retention

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

  4. 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 forIon Physics Association EURATOM-ÖAW, Innsbruck University, Austria

  5. Castor Tokamak • R = 40 cm • a = 8.5 cm • B = 1.2 T • Ip =10 kA • background pressure • < 10−4 Pa • operating H2 pressure • ~ 10−2 Pa • t ~ 30 ms • <ne> ~ 1019 m−3 • ne ~ 1018 m−3 in SOL

  6. Castor Tokamak Plasma potential measurements Katsumata probe - schematic representation

  7. Castor Tokamak Plasma potential measurements

  8. 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)

  9. Castor Tokamak Ion temperature measurements

  10. Castor Tokamak Diffusion coefficient measurements Power spectra fluctuations for different collector position h [mm](r = 65 mm)

  11. Castor Tokamak Diffusion coefficient measurements Radial decay of spectrum at 10 different frequencies

  12. Castor Tokamak Diffusion coefficient measurements Measured diffusion coefficient - black points Bohm diffusion coefficient (x 3.5) - red line

  13. Pilot - PSI

  14. Pilot - PSI Gas Ar, Ar + H2, H2 Gas flow 1…2 slm 1 slm ~ 4.48×1020 molec/s Source current IS = 80…150 A Gas pressure p = 1…5 Pa Magnetic field strength B = 0.4…1.2 T

  15. Pilot - PSI B = 0 T B = 0.4 T H2 + Ar Ar H2 H2

  16. H2 Pilot - PSI Plasma potential radial profile - emissive and cold probes B = 0.4 T H2: Id = 120 A, p = 1.6 Pa

  17. Pilot - PSI Ar and H2: p = 3.1 Pa, Qv = 2 slm

  18. Pilot - PSI Azimuthal drifts Electric drift Diamagnetic drift

  19. H2 Pilot - PSI Azimuthal drifts OES Measurements of Hα line (neutrals rotation)

  20. Pilot - PSI Multi-Channel Analyzer (MCA)

  21. Pilot - PSI Multi-Channel Analyzer (MCA)

  22. Pilot - PSI Multi-Channel Analyzer (MCA)

  23. 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

  24. Conclusions Communicated results (2005-2009) ISI Articles 5 Conferences 11 Workshops 5

  25. Future plans COMPASS tokamak – IPP ASCR, Prague Major radius 56 cm Minor radius 20 cm Plasma current < 350 kA Magnetic field 0.8 – 2.1 T Pulse length < 1 s December 9, 2008 – first plasma February 19, 2009 – official start of tokamak operation

  26. 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

  27. Future plans FUSENET - The European Fusion Education Network • Purpose: increase, enhance, and broaden fusion training and education activities in Europe • 48 months, startedthe 1st of October 2008 • Total budget of 2,000 k€ • 36 participants from 18 countries • 22Universities • 14 Euratom Associations

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