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Experimental Proposals Submitted to TF4 Roberto Cavazzana

Experimental Proposals Submitted to TF4 Roberto Cavazzana. TF4 Topics Urtext edition of proposals What's left. From wikipedia: an urtext edition of a work of classical music is a printed version intended to reproduce the original intention of the composer as exactly as possible.

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Experimental Proposals Submitted to TF4 Roberto Cavazzana

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  1. Experimental Proposals Submitted to TF4 Roberto Cavazzana • TF4 Topics • Urtext edition of proposals • What's left From wikipedia: an urtext edition of a work of classical music is a printed version intended to reproduce the original intention of the composer as exactly as possible. R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009

  2. Some remarks… The quality of proposals is considerably improved since last year. • Experience gained by many people, including the young, by participating in the experiments and sharing the results. -> Contain new ideas. -> Well constructed. -> More focused. Report from Accounting Dept.: 39 proposals 161 gross total exp days 102 net total exp days R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009

  3. 2008 Topic List TF4 2008 Optimization of RFX-mod discharges: RFP, tokamak and non standard plasmas • Start-up scenarios • Equilibrium control, in particular in view of high current operation • Feedback on global quantities (Toroidal field, current) • Magnetic configuration symmetry • Development of tokamak and low-q scenarios • Effect of plasma shaping (X-point, ...) • Development of reference discharges TF5 2008: Density Control and Plasma-Wall Interaction • Effect of wall conditioning techniques • Optimization of existing wall conditioning techniques • Development of new techniques • Characterization of wall conditions and of fuel inventory • Improvement and standardization of fueling techniques • Assessment of heat loads and of the effect of pWI on plasma performance (density control) R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009

  4. TF4 Topic List Reformulated Magnetic Optimization • Start-up scenarios and Reference discharges • Equilibrium control • Feedback on global quantities (toroidal field, plasma current) • Horizontal Equilibrium and plasma shaping (X-point, ...) • Error field reduction and Symmetry improvement • Development of tokamak, low-q and non-standard cfgs • Test of Diagnostic Systems Density control • Optimization and development of wall conditioning techniques • Characterization of wall conditions and fuel inventory • Improvement and standardization of fueling techniques • Heat loads and effects of Plasma Wall Interaction on performance R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009

  5. Test of Diagnostic Systems R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009

  6. Non RFP Configurations R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009

  7. Reference Discharges I – High Current R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009

  8. Reference Discharges II - Other R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009

  9. Equilibrium Control R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009

  10. Error Field Correction and Symmetry R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009

  11. Start-up R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009

  12. Density Control R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009

  13. A personal priority list … • Horizontal Equilibrium control (thin shell + meachanical structure) with gaps (eff~70ms) conducting vessel out of equilibrium single quadrant power supply critical for tokamak an low q operation too!! • Field error correction – Shape • Reduction of localized plasma wall interaction. Strategies: • active correction • windings current balancing • smooth and cautious waveform programming • MHD Equilibrium control Widens and makes safer the operating range • Effective Field Mapping of Br system (pseudo-decoupler) - An essential tool (even if not in real time) R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009

  14. … • Control of density and impurities • Machine Operation • reduce the need of GDC • more useful shots. • Plasma performance • reduction of impurities • field error reduction • equilibrium • wall treatments Methods • Characterization the Glow Discharge cleaning and pre-loading. • Start-up optimization (breakdown and reversal) • Field error reduction • Toroidal field symmetrization & m=0 structure modification Challenging and time consuming, but pays … R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009

  15. What's left ? A more general "real-time" trigger (pellets, DRE sync, …) Prop. 49/TF3 /Alfier, Manduchi / Thomson scattering systems synchronization on QSH events. A current controller for tokamak operation these may drastically reduce the need of experimental time and provide much clear results. ? R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009

  16. Toroidal System • 12 independent sectors • full four quadrant power supply dedicated for each sector • 3 kV 6 kA (18 MVA) fpwm ~ 1400 Hz Up to now its capability had been very partially exploited!! R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009

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