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 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 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 ●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 operation 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 TF4 Topic List Reformulated Magnetic Optimization ● Start-up scenarios ● Equilibrium control and Reference discharges - 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 ● Test of Diagnostic Systems Density control cfgs ● 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 Test of Diagnostic Systems TF N. Exp 1 2 3 4 Days Proposers Title 7 x 1 F.Bonomo, M.Valisa DNBI: neutral beam current observation 8 x 2 F.Bonomo, M.Valisa, F.Milani, L.Zanotto DNBI: feasibility tests for CX and Stark measurements 18 x 1 F.Bonomo, M.Valisa DNBI operation with a modified scrape-off layer Carraro,Alfier,Fassina,Menmuir,Pasqualot to,Puiatti,Valisa Optimisation of metals Laser Blow Off injection in RFX-mod 12 x x 2 R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009 Non RFP Configurations TF N. Exp 1 2 3 4 Days 72 76 x 2 M.Zuin Alternating Gradient Quadrupolar Focusing x 2 M. Zuin, N. Vianello Bumpy RFP 75 Exp 1 2 3 4 Days 14 Proposers Title x x 5 Spizzo, Puiatti, Valisa, Scarin, Cappello, Piovan, Zanotto, Zuin, Vianello, Alfier, Auriemma High density ULq plasmas x 4 Matteo Zuin, N. Vianello, R. Piovan, R. Cavazzana, D. Bonfiglio, L. Zanotto Edge probe measurements in ULQ discharges x TF N. Title x TF N. Proposers Exp 1 2 3 4 Days Proposers Title 63 x x 4 N.Vianello, R. Cavazzana, E. Martines, M. Zuin, B. Momo, G. Marchiori ESN-DN Tokamak discharges 102 x x 4 Puiatti,Valisa, Spizzo, Scarin, Carraro, Cavazzana Tokamak discharges near the Greenwald limit R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009 Reference Discharges I – High Current TF N. Exp 1 2 3 4 Days Proposers Title x 4 P. Piovesan, G. Marchiori, L. Marrelli, L. Piron, A. Soppelsa, P. Zanca Optimization of the CMC scheme in preparation of 2MA operation 52 x x 12 R.Cavazzana, R.Lorenzini, F.Milani, G.Marchiori, G.Spizzo, D.Terranova, N.Vianello and interested people. The 1.8 and 2 MA discharges 73 x x x 4 Matteo Zuin, Paolo Piovesan, Rita Lorenzini, Roberto Cavazzana QSH study through F scan at high current 81 x x 4 R.Cavazzana, M.Zuin, E.Martines, B.Momo and interested people. QSH and SHAx at High Density 82 x x 4 R.Cavazzana, M.Zuin, M.Spoloare, E. Martines, B.Momo, Extreme F ~ 0- RFP 108 x R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009 Reference Discharges II - Other TF N. 20 65 121 Exp 1 2 3 4 Days x 8 x x x x x 4 8 Proposers Title T. Bolzonella, L. Grando, P. Innocente, F. Milani, L. Novello, S. Ortolani, S. Peruzzo, R. Piovan Slow plasma current rise N.Vianello, R. Cavazzana, E.Martines, M.Spolaore, M.Zuin, G. De Masi, S. Spagnolo, B. Momo Low current high density discharge B. Chapman, P. Franz, D. Terranova, M. Valisa Production of low-current, lowdensity standard plasmas in H2, D2, and He as targets for application of PPCD 55 x x x x 12 M. Spolaore, P. Franz, P. Zanca, R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009 Plasma current parameter scaling on CMC discharges Equilibrium Control TF N. Exp 1 2 3 4 Days Proposers Title 99 x 12 R.Cavazzana, G.Marchiori, A.Soppelsa, L.Grando, L.Zanotto, L.Novello, E.Gaio, … Optimization of the Horizontal Equilibrium 98 x 3 P.Bettini, R. Cavazzana, G. Marchiori, A.Soppelsa, T. Bolzonella, … Development of a Flat Top Plasma Current Controller 9 x 2 L. Zanotto and all interested people Operation with toroidal power supply in open-loop control 101 x 4 R.Cavazzana, G.Marchiori, L.Zanotto, A.Salata, A.Soppelsa, … Precise F controller R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009 Error Field Correction and Symmetry TF N. Exp 1 2 3 4 Days Proposers Title 67 x x 4 M. Zuin, G. Marchiori, R. Cavazzana High order m=0 mode control 71 x x 4 M. Zuin, G. Marchiori, R. Cavazzana, L. Zanotto Low order m=0 mode control x 8 A. Soppelsa, L. Marrelli, P. Piovesan, D.Terranova Full mutual couplings scan x 4 L.Grando, G.Marchiori, L.Marrelli, P.Piovesan, L.Piron, A.Soppelsa, D.Terranova Field Error Correction 125 84 x R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009 Start-up TF N. Exp 1 2 3 4 Days Proposers Title 89 x 4 T. Bolzonella, P. Innocente, S. Dal Bello Plasma startup at low Vloop 100 x 2 R Cavazzana, A. Canton, S. Dal Bello, ... Lean Startup R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009 Density Control TF N. Exp 1 2 3 4 Days Proposers 4 x x Gazza, Canton, Carraro, Puiatti, Valisa, Scarin, Agostini, Innocente, Menmuir, Zaniol Spectroscopic characterization of the wall and plasma boundary 36 x P. Innocente, D. Terranova, A. Canton, F. Auriemma, S. Dal Bello and FC Group Lithium Pellets for First Wall Conditioning 48 x 12 Alfier, Mazzitelli, Scarin, Dal Bello, Cavazzana, Canton, Innocente, Spolaore, … First Wall Conditioning by means of Li-CPS limiter 129 x 6 S. Dal Bello, A. Canton, R. Cavazzana Optimization of Baking and Boronisation procedures 130 x 2 A. Canton, S. Dal Bello, R. Cavazzana Optimization of Glow Discharge Cleaning and Preloading 131 x 3 A. Canton, S.Dal Bello, E. Gazza, R.Cavazzana Helium discharges and Hydrogen desaturation 132 x S. Dal Bello, A. Canton, M. Spolaore, P.Innocente, .. Test on samples inserted during RFX plasma discharges 133 x E. Vassallo et al. (IFP-Milano), S Dal Bello, A. Canton, P. Innocente, M.Spolaore, … “Scavenging” effect studies – samples insertion 134 x S. Dal Bello, A. Alfier, A. Canton., R. Cavazzana, P. Innocente, M.Spolaore … Test on samples inserted during RFX GDC-wall conditioning 4 R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009 Title 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 … ● 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 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 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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# 10_RFXmod_2009_WS_TF4_Cavazzana