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Integrated Operation Scenarios

Summary of JE IOS-1.1
ITER baseline, at q95=3, βN=1.8, ne=0.85xnGW(D, H, He)

October 2011
G. Sips

Summary of JE IOS-1.1

G. Sips

1IOS Meeting @ Kyoto-Univ., Oct. 2011

ITPA

Integrated Operation Scenarios

IOS-1.1: ITER baseline, at q95=3, βN=1.8, ne=0.85nGW
Contributors (2011):
G. Jackson (DIII-D), G. Sips (JET), J. Schweinzer (AUG), S. Wolfe (C-Mod)
Results until April 2011:•JET: Only results from 2010: Stationary H98~1, only at Ptot/PL-H=1.3-2,Ip  4.5MA. Comparison between NBI and ICRH.

•C-Mod: Improved ramp-up phase to 1.3MA/5.3T, prepare for pulses at 2.7T.
Ip = 650 kA, q95 = 3-3.2, βN < 1.9, H98 = 0.8-0.95, κ~ 1.75, fGW < 0.72.

•

DIII-D: Data analyses: Stability of long pulse operation at q95=3  n=1 tearing
modes. Planning for the 2011 run campaign•AUG: Stable discharges for 4 sec, still limited by the length of the ECRH highpower phase: Parameters: H98=0.85-1.0, βN=2-2.3 at q=3.0, fGW =0.7. Ip=1.1MA,
Bt=1.8 T, PECRH=1.5 MW, PNBI=6.3 MW. δupper ~ 0.10, δlower ~0.39

Summary of JE IOS-1.1G. Sips

2IOS Meeting @ Kyoto-Univ., Oct. 2011

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Integrated Operation Scenarios

AUG:• In 2011 AUG has done ≈10 q95=3 discharges (1.1MA / 1.8T)
with ECRH in X3 mode, δ = 0.25, κ = 1.75
• In stable phases fGW is clamped to 65% and cannot be changed
by gas puff rate  In 2012 use pellet fuelling and use higher δ.
• N seeding leads to cold divertor and keeps the confinement
slightly above 1.
•

βN is always higher than the ITER target of 1.8• In 2012: Use 1.2MA/1.2T with high power ICRH (boron coatedtiles next to ICRH antenna‘s)

Summary of JE IOS-1.1

G. Sips3

IOS Meeting @ Kyoto-Univ., Oct. 2011

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Integrated Operation Scenarios

AUG:

Summary of JE IOS-1.1#26634: q95=3: 1.1MA / 1.8T with medium D puff

G. Sips

4

IOS Meeting @ Kyoto-Univ., Oct. 2011

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Integrated Operation Scenarios#26869: q95=3: 1.1MA / 1.8T with N seeding

AUG:Summary of JE IOS-1.1G. Sips

5IOS Meeting @ Kyoto-Univ., Oct. 2011

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Integrated Operation Scenarios

C-Mod:•C-Mod has not obtained any new experimental data since thosereported last April (shutdown)•C-Mod should be resuming operation this fall, plans regarding
IOS-1.1 remain the same.

•Continued exploitation of the 2.7T, 2nd harmonic proton heating
regime at target βN and fGW , including ramp-down studies fromnominal target condition.

•Possible extension of the 2.7T regime to He majority plasma, ifsteady H-mode can be obtained (we have no positive experience
with EDA H-mode in Helium majority plasmas).

•Attempts to access βN~1.8 with ITER-like parameters at 5.4T,
initially at lower fGW due to fuelling and ICRF restrictions.

Summary of JE IOS-1.1

G. Sips

6IOS Meeting @ Kyoto-Univ., Oct. 2011

ITPA

Integrated Operation Scenarios

C-Mod: BT = 2.7T operation allowing access to simultaneous parameters
throughout discharge (result shown in April 2011)
Targeting q95 ~ 3, βN ~ 1.7,
κ ~ 1.8, n/nGr ~ 0.85, H98 ~ 1
Used BT = 2.7 T, 2nd harmonic Hminority heating at 80 MHz
Ip = 650 kA, q95 = 3-3.2, βN < 1.9
H98 = 0.8-0.95, κ~ 1.75mn/nGr < 0.72
High βN discharges show ~ 10 kHz
mode, some found to have n =2,3(NTM?) & sometimes small ELM
activity in addition to EDA QC mode
Summary of JE IOS-1.1G. Sips

7IOS Meeting @ Kyoto-Univ., Oct. 2011

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Integrated Operation Scenarios

DIII-D:•

Performed a 1 day experiment in ITER similar discharges to try toobtain dominant electron heating. Unfortunately, theseexperiments were plagued with tearing modes.

•Only up to about 250 ms, with dominant ECH (electron) heating,but these phases are not long enough to draw any conclusions
for ITER or the joint experiments.

•Sawtooth mitigation that might have helped reduce the seedisland amplitude below the tearing mode threshold.

•Extensive discussions with ITER IO about development of He
versions of the baseline scenario. After consideration, this wasdeferred to 2012.

Summary of JE IOS-1.1

G. Sips

8IOS Meeting @ Kyoto-Univ., Oct. 2011

Plans for 2012
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Integrated Operation Scenarios

IOS-1.1: ITER baseline, at q95=3, βN=1.8, ne=0.85nGW
JET: Extensive scenario development (deuterium only) at q95~3 with thenew Be/W wall. Ramp-up, ramp-down, flat top, entry into H-mode, exitfrom H-mode and flat top phase
AUG: More discharges comparing heating schemes (NBI/ICRH/ECRH).
Use pellet fuelling and use higher δ. Use 1.2MA/1.2T with high power
ICRH (boron coated tiles next to ICRH antenna‘s)
C-Mod: Exploitation of the 2.7T, 2nd harmonic proton heating regime attarget βN and fGW , including ramp-down studies from nominal target
condition. Possible use of He majority plasma. Possibly extend
experiments to 5.4T.
DIII-D: Dominant ECH (electron) heating in ITER target discharges at
q95~3. Develop He versions of the baseline scenario.
 Continue IOS-1.1 in 2012
Summary of JE IOS-1.1

G. Sips

9IOS Meeting @ Kyoto-Univ., Oct. 2011