R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009 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.
Experimental Proposals Submitted to TF4 Roberto Cavazzana
Jan 15, 2016
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. - PowerPoint PPT Presentation
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R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009
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 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
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
Test of Diagnostic Systems
TF Exp
N. 1 2 3 4 Days Proposers Title
7 x 1 F.Bonomo, M.ValisaDNBI: 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.ValisaDNBI operation with a modified scrape-off layer
12 x x 2 Carraro,Alfier,Fassina,Menmuir,Pasqualotto,Puiatti,Valisa
Optimisation of metals Laser Blow Off injection in RFX-mod
R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009
Non RFP Configurations
TF Exp
N. 1 2 3 4 Days Proposers Title
14 x x 5Spizzo, Puiatti, Valisa, Scarin, Cappello, Piovan, Zanotto, Zuin, Vianello, Alfier, Auriemma
High density ULq plasmas
75 x x 4 Matteo Zuin, N. Vianello, R. Piovan, R. Cavazzana, D. Bonfiglio, L. Zanotto
Edge probe measurements in ULQ discharges
TF Exp
N. 1 2 3 4 Days Proposers Title
72 x 2 M.ZuinAlternating Gradient Quadrupolar Focusing
76 x x 2 M. Zuin, N. Vianello Bumpy RFP
TF Exp
N. 1 2 3 4Day
s Proposers Title
63 x x 4N.Vianello, R. Cavazzana, E. Martines, M. Zuin, B. Momo, G. Marchiori ESN-DN Tokamak discharges
102
x x 4Puiatti,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 Exp
N. 1 2 3 4 Days Proposers Title
108 x 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 12R.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
R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009
Reference Discharges II - Other
TF Exp
N. 1 2 3 4 Days Proposers Title
20 x 8T. Bolzonella, L. Grando, P. Innocente, F. Milani, L. Novello, S. Ortolani, S. Peruzzo, R. Piovan
Slow plasma current rise
65 x x 4N.Vianello, R. Cavazzana, E.Martines, M.Spolaore, M.Zuin, G. De Masi, S. Spagnolo, B. Momo
Low current high density discharge
121 x x x 8 B. Chapman, P. Franz, D. Terranova, M. Valisa
Production of low-current, low-density 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, Plasma current parameter scaling on CMC discharges
R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009
Equilibrium Control
TF Exp
N. 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 Exp
N. 1 2 3 4 Days Proposers Title
67 x x 4 M. Zuin, G. Marchiori, R. CavazzanaHigh order m=0 mode control
71 x x 4 M. Zuin, G. Marchiori, R. Cavazzana, L. Zanotto Low order m=0 mode control
125 x 8 A. Soppelsa, L. Marrelli, P. Piovesan, D.Terranova Full mutual couplings scan
84 x x 4L.Grando, G.Marchiori, L.Marrelli, P.Piovesan, L.Piron, A.Soppelsa, D.Terranova
Field Error Correction
R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009
Start-up
TF Exp
N. 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 Exp
N. 1 2 3 4 Days Proposers Title
4 x x Gazza, Canton, Carraro, Puiatti, Valisa, Scarin, Agostini, Innocente, Menmuir, Zaniol
Spectroscopic characterization of the wall and plasma boundary
36 x 4 P. Innocente, D. Terranova, A. Canton, F. Auriemma, S. Dal Bello and FC Group
Lithium Pellets for First Wall Conditioning
48 x 12Alfier, 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. CavazzanaOptimization of Baking and Boronisation procedures
130 x 2 A. Canton, S. Dal Bello, R. CavazzanaOptimization of Glow Discharge Cleaning and Preloading
131 x 3 A. Canton, S.Dal Bello, E. Gazza, R.Cavazzana
Helium discharges and Hydrogen de-saturation
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
R. Cavazzana – RFX-mod programme Workshop – 21 - I - 2009
A personal priority list …
●Horizontal Equilibrium control (thin shell + meachanical structure) with gaps (eff~70ms)
conducting vessel out of equilibriumsingle 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!!
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