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Angelo A. Tuccillo EX/1-1 20 th IAEA Fusion Energy Conference, Vilamoura, 1-6 November 2004...
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Transcript of Angelo A. Tuccillo EX/1-1 20 th IAEA Fusion Energy Conference, Vilamoura, 1-6 November 2004...
EX/1-1 20th IAEA Fusion Energy Conference, Vilamoura, 1-6 November 2004 Angelo A. Tuccillo
Development on JET of Advanced Tokamak Operations for ITER
presented by
Angelo A. TuccilloAssociazione EURATOM ENEA sulla Fusione
on behalf of
EFDA JET Task Force S2 and Contributors to EFDA JET Work-Programme
With special thanks to X. Litaudon (CEA), F. Crisanti (ENEA) forcoordinating the S2 Task Force and UKAEA for JET Operations
EX/1-1 20th IAEA Fusion Energy Conference, Vilamoura, 1-6 November 2004 Angelo A. Tuccillo
OUTLINE
Summary of achieved performances Hybrid Regime (EX/4-2, EX/P2-1)
High Triangularity (EX/P3-11)
RTC (EX/P2-5)
Highlight of explored scenarios Similarity experiments Pellet fuelled ITBs Mode Conversion ITBs (EX/P6-18)
Long Operation ITBs
Fuel-Impurity transport
Conclusions
EX/1-1 20th IAEA Fusion Energy Conference, Vilamoura, 1-6 November 2004 Angelo A. Tuccillo
Recent Progress in AT Research at JET
Newly developed Hybrid Regimecould represent a path to achieve High Performance and Long Operations
High scenarios (Hybrid -ITB) progressed with new Divertor configuration
Focus of campaigns was on scenarios optimisation: increase ITB volume to allow rising H
P
EX/1-1 20th IAEA Fusion Energy Conference, Vilamoura, 1-6 November 2004 Angelo A. Tuccillo
(AUG & DIII-D from ITPA database)
1 2 3 4 5 6 7 8 9 100
0.5
1
1.5
2
2.5
3
x 10-3
N
*
1.7 T
For q95~4
AUG
JET
2.4T
ITER
=0.2 (circles) =0.45 (triangles)
3.4T
3.1T
DIII-D
Limited by Power Availability MHD Limited
AUG-DIII-D
RF-Heated Hybrid scenario
3.8<q95<5.5
Hybrid Regime: from AUG similarity to ITER like *
RF-i+ Heating ons=0 e- ITB, q95=5.5PLH/ICRH=2/5MWDiag.NBI P=2MW
EX/4-2 E. Joffrin(CEA, France), A.C.C. Sips(IPP, Germany)
Standard ITBsq95~7, P~21MWq95~4, P~19MWq95~5, P~17MW
EX/P2-1 F. Crisanti, E. Basilio, C. Gormezano (ENEA, Italy), A. Becoulet, F. Rimini(CEA, France)
EX/1-1 20th IAEA Fusion Energy Conference, Vilamoura, 1-6 November 2004 Angelo A. Tuccillo
Development of ITB at ITER-Relevant TriangularityIntegrated optimisation of core (double barrier) and edge (ELM mitigation by Ne injection) produces long lasting (t~10E):
Wide barrier (R=3.7m) at ~0.45 H89N/q295~0.1; n/nGW~60%
D
P (MW)
Contour
R(m)
Inner ITBOuter ITB
H-Pedestal
#62293
EX/P3-11 F. G. Rimini, M. Becoulet (CEA, Fr), P.J. Lomas (UKAEA, UK), E. Givannozzi, O. Tudisco (ENEA, It)
2.2
r2ITB
xCs/(cixLTe)
Neon
Short lived ITB
2.0
1.8
1.6
1.4
1.2
1.0
H89
0.005 0.010 0.015 0.020.0
EX/1-1 20th IAEA Fusion Energy Conference, Vilamoura, 1-6 November 2004 Angelo A. Tuccillo
EX/P2-5 D. Moreau, D. Mazon (CEA, France), A. Murari (RFX, Italy) et al
Integrated Real-Time Control of Advanced Scenarios
Simultaneous Control of Current and Electron Temperature profileswith LHCD-ICRF-NBI as actuators
JET #62160 Vloop~0.05
EX/1-1 20th IAEA Fusion Energy Conference, Vilamoura, 1-6 November 2004 Angelo A. Tuccillo
AUG #16147 (0.7s)/JET #62175 (2.5s)BT = 3.0 T / 1.8 TIP = 0.78 MA / 0.81 MAq95 = 6.8 / 7.6<ne> = 2.3x1019 m-3 / 1.1x1019 m-3
<Te> = 1.2 keV / 0.6 keV
JET-ASDEX Upgrade ITB Comparison Experiments
- Ti/Te AUG > JET ==> JET NBI more e- heater- Higher Ti in AUG ==> more favourable for ITG- not perfectly matched- Both devices generated an ion ITB at 7-10MW- Neither machine exhibited an electron ITB- Both made transient ITBs which collapsed at the onset of large ELMs
Wide e-, -i+ ITB @ 60% nGW with Nemoderating the edgebut H89 ~1.7• on JET • not yet on AUG
C. Challis (UKAEA, United Kingdom), A. C. C. Sips (IPP, Germany)
~10 E
R ~ 3.56 m
EX/1-1 20th IAEA Fusion Energy Conference, Vilamoura, 1-6 November 2004 Angelo A. Tuccillo
Pellet Fuelled ITBs
D. Frigione(ENEA, It), C. Challis,, M. De Baar(FOM, Nl), P. De Vries(UKAEA, UK), L. Garzotti(RFX, It)
LHCD
Pellet +
Low NBI Pw
ITBTi~Te
ne0nGW
@ Low Rotation
Standard ITB PTot/PLH=19/2MW PTot=15.6/1.2MW
Pellet
ITB
P Tot/P LH
=16.4/2MW
Te(keV)
Ti(keV)
ne(1020m-3)
EX/1-1 20th IAEA Fusion Energy Conference, Vilamoura, 1-6 November 2004 Angelo A. Tuccillo
Pellet Fuelled ITBsDeep Pellet kills ITB Shallow Pellet does NOT
L. Garzotti (RFX, It) et al, EPS London 2004, Vol. 28b p-1.147
JETTO Simulation:Particles diffusion increase
Not much affected
Toroidal velocity shear decreasesNot much affected
Density flattens at ITB location
Small reduction of gradient and ITB radius
Turbulence stabilisation strongly affected
Less affected
EX/1-1 20th IAEA Fusion Energy Conference, Vilamoura, 1-6 November 2004 Angelo A. Tuccillo
Mode Conversion ITBs
QDT~0.25 best TRANSP estimate including +FW-MC impurities Zeff~4-5 off-axis Ni profileP. Mantica (IFP-CNR, It), F. Imbeaux (CEA, Fr), M. Mantsinen (TEKES, Finland), D. Van Eester (ERM, Belgium)
0
5
10
15
20
25
2 2.5 3 3.5 4
59411 Mode conversion central
Tikk3ne LIDARq MSE
R[m] R(m)
BT = 3.6 T IP =2.9 MA12% 3He33 MHz
Ti(keV)
Te(keV)
ne(1019 m-3)
q
#59411 Central MC
2 3 4
5
15
25
0
EX/1-1 20th IAEA Fusion Energy Conference, Vilamoura, 1-6 November 2004 Angelo A. Tuccillo
From ICRH modulation analysis: Two heat waves traveling towards ITB:
MC from outsideFW from centre
Both waves strongly damped at ITB: ITB appears to be a narrow layer with low heat diffusivity, characterized by sub-critical transport and loss of stiffness
Mode Conversion ITBs
EX/P6-18 P. Mantica (IFP-CNR, Italy) et al.
EX/1-1 20th IAEA Fusion Energy Conference, Vilamoura, 1-6 November 2004 Angelo A. Tuccillo
5 10 15 20
1.0 2.0 3.0 4.0 5.0
2.0 4.0 6.0 8.0
2 4 6 8
10 12
0.700.800.901.001.10
Neutron/1015 (s-1)
Ti (keV)
li
NBI [MW]ICRH [MW]
LHCD [MW]
First attempts to 20 s pulse:
#62065-1.6MA ==> short ITB (~20 E)
but JET record of ~330 MJ injected
Long pulse operation under development
E. Joffrin (CEA, france), V.Pericoli (ENEA, Italy)
Long lasting ITBs (40 E):
#58179, =0.2, n/nGW=0.4
P
~40% IBoot, ~40% ILHCD
N x H89 = 1.6 x 1.9
q95= 6, RITB~3.6m (+3.3m)
PNBI = 12MW
PICRH = 3MW
PLH = 2.5 MW Time (s)
EX/1-1 20th IAEA Fusion Energy Conference, Vilamoura, 1-6 November 2004 Angelo A. Tuccillo
Fuel Transport in ITB discharges
J. Mailloux, C. Challis, K-D. Zastrow (UKAEA)
Spatial and temporal neutron emissivity fittedby UTC/Sanco code:
Tritium diffusivity decreases to neoclassical valueat barrier location
Convection decrease too but higher than neoclassical
Again barrier seemsa narrow layer of reduced diffusivity
EX/1-1 20th IAEA Fusion Energy Conference, Vilamoura, 1-6 November 2004 Angelo A. Tuccillo
C. Giroud (UKAEA, United Kingdom)
Impurity Transport in double barrier scenario
Best Fitting with UTC/SANCO Ne10+ density (CXS) and Ne7+ line intensity (VUV)
Double barrier structure evident on inferred transport coefficients of injected Ne
Comparable behaviour on stronger barrier, Cs/ci*LTe>> 1.410-2
Step down of diffusivity at inner ITB location but remains always higher than NC
Strong outward convection at outer ITB otherwise close to NC
EX/1-1 20th IAEA Fusion Energy Conference, Vilamoura, 1-6 November 2004 Angelo A. Tuccillo
CONCLUSIONSIntegrate optimisation of core and plasma edge allowedAT research at JET progressing towards wide ITBs
Wide barriers with foot close to H pedestal have been obtained at ITER relevant triangularity, ~ 0.45, with edge MHD moderate by Ne injection
Real Time Control techniques have contributed to this progress. Simultaneous RTC of pressure and current profile has also been achieved.
ITBs scenarios suitable for steady state operations have been developed bringing to a JET record of ~330 MJ ofinjected energy.
EX/1-1 20th IAEA Fusion Energy Conference, Vilamoura, 1-6 November 2004 Angelo A. Tuccillo
CONCLUSIONS
Transport analysis of injected impurities, T fuel or heat wave induced by ICRF modulated power indicate that theITBs behave as a layer of reduced diffusivity
Exploitation of developed scenarios at higher performancewill progress in future JET campaigns accordingly with increasing power availability
Hybrid regimes have been extended to * values close to ITER domain. Development of the regime with dominant electron heating also started
EX/1-1 20th IAEA Fusion Energy Conference, Vilamoura, 1-6 November 2004 Angelo A. Tuccillo
Wednesday November 3rd
EX/4-2) E. Joffrin “The Hybrid scenario in JET: towards its validation for ITER”
EX/P2-1) F. Crisanti “JET RF Dominated Scenarios and Ion ITB Experiments with Low External Momentum Input”
EX/P2-5) D. Moreau “Development of Integrated Real-Time Control of ITB in Advanced Operation Scenarios on JET”
Thursday November 4th
EX/P3-11) F. Rimini “Development of ITB scenarios at ITER relevant high triangularity in JET”
EX/P4-28) J. Mailloux “ITER relevant coupling of Lower Hybrid Waves in JET”
Friday November 5th
EX/P6-18) P. Mantica “Progress in understanding heat transport at JET”
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