itpa - ios 18-21 st oct. 2011 - kyoto e. joffrin jet programme with the ilw in 2011-12 and relations...

ITPA - IOS 18-21st Oct. 2011 - Kyoto

E. Joffrin

JET programme with the ILW in 2011-12 and relations with the IOS Joint experiments


Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

2011 C28 C28 C28 C28 C29

2012 C29 C29 C30a C30a C30b C30c Shutdown

Campaigns in 2011-2012

Pump-down15 May 2011

1st plasma24th Aug 2011

130d

(80d)

R1 C28A (15d) R2

C28B (10d) R3

C28C

H-mode

(3d) R4a

C29

Ohmic11 sessions

Done!

L-mode R4b

• 182 experimental days in C28-C29-C30. • Detailed plan established for C28-C29. • C30 to be consolidated in the Programme meeting of the 30th Nov to 2nd Dec 2012

Restart blocks interleaved with Campaign C28 blocks.

JET Campaigns in 2011-2012


C28a campaign

First plasma on the 24th of August then R1 (~50 pulses)

Campaign C28a: 01(late)-09 Sept 2011 – in second restart R2 since 11 shifts devoted to a single experiment: Initial first wall Be erosion, Be and W material mixing and fuel retention Discharges (2MA, 2T, low ) were similar to reference discharges in C

Critical issues: Runaway Electron beam created at the plasma start-up and caused small local melting of Be Gas balance accuracy under examination. W UFOs in first plasmas (cleaned up with time + shape optimisation)

Technical issues: Power supplies issues are delaying the first NBI into plasma.


Discharge Evolution

divertor flat-top

frad~32%

fGW~30%

Te(0)

Ip

BT

neL

fuelling rate

Prad

One X-point, one flat top and one termination scenario One X-point, one flat top and one termination scenario validated for this campaignvalidated for this campaign


R1

C28a

R2

C28b

R3

C28c

Objective/expected resultsObjective/expected results

First ohmic scenario: Ex-1.1.2 1 limiter phase, X-point formation and low shape

More shapes + PPCC: HT3, V5, SFEPIW end-to-end testsNBI8, ICRH, LH

ICRH coupling: Ex-2.1.6Intrinsic impurity composition: Ex-2.2.1First disruption studies: Ex-3.3.1Be & W power handling: Ex1.2.3 / Ex-1.2.1

H-mode qualification with ILW: Ex-2.1.4

Baseline H-mode at 2.5MA (1st): Ex-2.1.5

ICRH coupling: Ex-2.1.6Characterisation of heat load: Ex-3.1.3Disruption heat load: Ex-1.3.1L-H threshold study with ILW: Ex:3.2.1Bulk W tile power handling: Ex-1.2.3

WALLs energy limitsNBI4 + PEWS2, shinethroughIncreased ICRH + ECTVDE tests.

Building blocks/integration Building blocks/integration itemsitems

C28 campaigns in 2011

Week 44-45

Week 41-43

We are Here

L-mode qualification: Ex-2.1.2

First H-mode attempts: Ex- 2.1.5

IOS-5.2

IOS-1.0


R4

C29

Objective/expected resultsObjective/expected results Building blocks/integration Building blocks/integration itemsitems

PIW/VTM cause identificationEFCC controllerNBI to 100kV (25MW)

Baseline H-mode at 2.5MA : Ex-2.1.5

Plasma shape with EFCC: Ex-1.1.2Be tile power handling: Ex-1.2.1Disruption mitigation: Ex-3.3.2W screening and control: Ex: 2.2.2L-H threshold study with ILW: Ex:3.2.1

Characterisation of heat load: Ex-3.1.3Bulk W tile power handling: Ex-1.2.3Near upper null operation: Ex-1.2.2

Fuelling and seeding studies: Ex-2.1.5Type III ELM scenario (<2.5MA): Ex-2.2.5

Current profile access and overlap domain: Ex-2.1.7Near upper null characterisation: Ex:1.2.2Disruption mitigation: Ex:3.3.2Bulk W tile power handling: 1.2.3

Hybrid scenario development (1st): Ex-2.3.1

Baseline to high current (1st): Ex-2.3.2

ELM mitigation studies: Ex:2.2.7, Ex-2.2.3.

ELM mitigation studies: Ex:2.2.7, Ex:2.2.8, Ex-2.2.9, Ex-2.2.3.

C29 campaign

IOS-2.1

IOS-4.1 & IOS-3.2

IOS-1.0

Integration of seeding in scenario: Ex-2.2.3

IOS-2.1


For more detailed information, please consult (requires JET password):

TFE1 and E2 website:http://users.jet.efda.org/tfwiki/index.php/Main_Page

Timeline:http://electrahost.jet.efda.org:8087/htbin/experiments/timeline

Experiments in relation with IOS Joint experiments IOS Starting date

Develop H-mode baseline at 2.5MA: Ex-2.1.5Baseline H-mode to high current: Ex-2.3.2

1.0 November 2011

February 2012

Hybrid scenario development: Ex-2.3.1 4.2 February 2012

Current profile access and overlap domain: Ex-2.1.7 4.1 & 3.2 February 2012

Fuelling and seeding studies: Ex-1.3.2

Integration of seeding techniques: Ex-2.2.3

2.1

2.1

December 2011

February 2012

Characterisation of ICRH with the ILW: Ex-2.1.6 5.2 October 2011

Most of the scenario experiments should be started by the time of the next IOS ITPA meeting:

Link with IOS Joint experiments


IOS Objectives Starting date

IOS-1.0 Ex-2.1.5 (10 sessions) (Bucalossi/Neu) Qualify and document the baseline scenario (H-mode) in terms of access conditions and confinement quality. Qualify the response to gas fuelling including the access to good confinement at high density

Ex-2.3.2 (10 sessions) (Rimini/Joffrin) Study H-mode at the lowest * and *. Study the pedestal contribution to confinement. End to end demonstration of the ITER baseline scenario

Nov. 2011

Feb 2012

IOS-4.2 Ex-2.3.1 (13 sessions) (Hobirk/Challis) Establish the hybrid scenario with the new wall from the carbon reference (used for the identity with DIII-D & AUG) Get the largest possible variation in * and * Includes in the goals the use of impurity seeding for heat load mitigation (a la AUG)

Feb 2012

IOS-4.1 & 3.2

Ex-2.1.7 (4 sessions) (Mailloux/Bourdelle) Establish the largest range of target q profiles accessible on JET with the ILW Investigate which plasma physics factors are unique to specific operational scenarios ranging from baseline to AT

Feb 2012

Link with IOS Joint experiments

JET experiments which objectives are in line with IOS Joint experiments

But only low shape


Some additional/concluding remarks:

1- The JET contact persons for each IOS experiments may not be suitable any more because some people moved to other activities. I propose to review those for the next CC.

2- Note that the AT scenario is not included in the JET Programme in 2011-12. However, experiment Ex-2.1.7 has the goal to explore the access to q profiles (from qo~1 to above 2)

IOS-2.1 Ex-1.3.2 (9 sessions) (Maddison/Giroud) Qualify the H-mode performance with impurity seeding and the JET ILW and determine appropriate sensor and actuator Collisionality (density) scans

Ex-2.2.3 (6 sessions) (Monier-Garbet/Calabro) Integrate in scenario with RTC, ELM mitigation, OSP sweeping and detachment

Dec 2011

Feb2012

IOS-5.2 Ex-2.1.6 (5 sessions) (Van Eester/Jacquet)

Fully characterise H minority in D heating scenario with the new ITER-like wall in particular with regard to heat loads. Characterisation for each scenario of the effect of plasma-antennae distance.

Oct 2011

JET experiments which objectives are in line with IOS Joint experiments

itpa - ios 18-21 st oct. 2011 - kyoto e. joffrin jet programme with the ilw in 2011-12 and relations...

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