experimental proposals submitted to tf4 roberto cavazzana
DESCRIPTION
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 PresentationTRANSCRIPT
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!!