r. cavazzana – rfx-mod programme workshop – 21 - i - 2009 experimental proposals submitted to...

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.


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


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)


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


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


Non RFP Configurations

TF Exp


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


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


Reference Discharges I – High Current

TF Exp


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


Reference Discharges II - Other

TF Exp


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


Equilibrium Control

TF Exp


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


Error Field Correction and Symmetry

TF Exp


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


Start-up

TF Exp


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


Density Control

TF Exp


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


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)


…

●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 …


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.

?


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 experimental proposals submitted to...

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