Experimental Proposals
Submitted to TF4
Roberto Cavazzana
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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