C Gormezano, S Ide ITPA SSO&EP IEA-LT/ ITPA Collaboration 1 Steady State Operation & Energetic Particles Advanced Scenario need the same development path.

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Presentation transcript:

C Gormezano, S Ide ITPA SSO&EP IEA-LT/ ITPA Collaboration 1 Steady State Operation & Energetic Particles Advanced Scenario need the same development path as the reference ITER H-mode scenario oMulti-machine experiments essential to develop common vocabulary and experience oProgressive build-up of integration issues Scenarios seems to depend upon current profile: oHybrid Scenarios oSteady-State scenarios At this stage proposals are generic since related to scenario operation development: odetailed proposals will be made by ROs following approval Specific joint experiments on Energetic Particles not being made: oJoint data analysis is highly recommended

C Gormezano, S Ide ITPA SSO&EP IEA-LT/ ITPA Collaboration 2 IEA-LT/ ITPA Collaboration : Hybrid Scenario Definition: oThe objective of the ITER Hybrid scenario is the maximum fluence/year(pulse). High priority in 2003 omap the existence domain for each machine oidentify across the domain the mechanism by which the current is prevented from peaking (fishbones, tearing mode, etc.). Variations of performance (e.g.,  ) with q 95 density and shape at fixed field and shape are of high interest. ROs: E.Joffrin, G.Sips, M.Wade, A.Isayama (S.Wolfe)

C Gormezano, S Ide ITPA SSO&EP IEA-LT/ ITPA Collaboration 3 Proposals for International Collaboration in 2004 Hybrid scenario oComplete mapping existence domain  AUG may need more time on q 95 scan.Older ASDEX Upgrade results already span a range of densities  DIIID needs more time on density scan; needs a little time for q 95 scan  JET established scenario at q 95 = 4; mapping not started (Nov but not in 2004).  JT60 established scenario at q 95 = 3.6; mapping not started (starting in Dec. 2003)  C-MOD: A proposal has been made to use new hardware (LHCD in particular) to access hybrid regime

C Gormezano, S Ide ITPA SSO&EP IEA-LT/ ITPA Collaboration 4 Hybrid scenario (2) Compare effects of tearing modes, fishbones, and sawteeth in this regime among machines ocurrent profile broadening, oconfinement reduction, ofast ion transport with fishbones, ofast ion effects on sawteeth)  This may not require additional run time immediately, but rather a coordinated analysis effort of the domain mapping discharges, which may lead to dedicated experiments. Investigations of Te/Ti effect on confinement in hybrid scenarios oAll machines have some capability to replace neutral beam power with ICRF or EC, which will heat the electrons.

C Gormezano, S Ide ITPA SSO&EP IEA-LT/ ITPA Collaboration 5 IEA-LT/ ITPA Collaboration : Steady State Scenario Definition: The objective of the ITER Steady state scenario is 100% non-inductive operation at Q>5. Joint experiments to probe the performance limits are proposed with the following specifications on the q profile: q 95 =4-5, q min = , q (0) -q min 3 and f BS >0.5 and are at present the most promising for ITER. Experiments with other q profiles have realized fully non- inductive sustainment. Candidate profiles for steady state should test consistency with Q>5 in burning plasma conditions.

C Gormezano, S Ide ITPA SSO&EP IEA-LT/ ITPA Collaboration 6 Steady State Operation: Priorities in 2003 High priority for the four large divertor machines oexplore performance limits with the recommended q profile and compare the results. ROs: X.Litaudon, J.Hobirk, T.Luce, S.Ide, (A.Hubbard)

C Gormezano, S Ide ITPA SSO&EP IEA-LT/ ITPA Collaboration 7 Proposals for International Collaboration in 2004 Steady-state scenario oDocument performance boundaries for the agreed current profile Performance includes the assessment of the potential for each machine to achieve fully non-inductive operation with that q profile  AUG: scenario has not been established  DIIID beta limit studies with variation in shape and pressure profiles has been done; –experiments with fully non-inductive operation still require time  JET: scenario to study performance limits (with present heating&CD capability) needs to be developed (unlikely in Dec.2003, not in 2004)  JT-60U: scenario was established in the past; to be re- established with modern diagnostics and heating systems (starting Dec. 2003, priorities being decided)

C Gormezano, S Ide ITPA SSO&EP IEA-LT/ ITPA Collaboration 8 Steady State Scenario (ctd) The key to pushing forward steady-state scenario is to have a demonstration of performance levels in JET or JT-60U which can be reasonably projected to burning plasmas. oDevelopment of such a scenario is consistent with the JT- 60U goals for 2004 oOther scenarios (different q profile, very hollow in particular) established on one machine to be tested in another machine (possible proposal from JT-60U) Increase significantly collaboration between groups owill greatly enhance the probability of success

C Gormezano, S Ide ITPA SSO&EP IEA-LT/ ITPA Collaboration 9 Impressive agreement between AUG,DIIID and JET Hybrid Scenario established on JET omatching elongation, aspect ratio, triangularity, q-profile and  *,all AUG features are recovered:  H ITER89P x  N ~5.9 at q 95 ~3.9  N up to 2.8 oHybrid regime achieved at lower  * (2.5T/2.1MA) but not at the lowest  * value (3.4T/2.8MA). At low q 95 ~ : sawteeth remain, lower beta limits  N =2.5 in AUG, 2.7 in DIIID For q 95 =3.8-4: sawteeth free, hybrid regime established only with dominant off axis NBI in AUG At q 95 >4:  N up to 3.2 in DIIID and AUG (limited by2/1 NTMs) The required values of  N H/q 95 2 to operate ITER at Q=10 have been achieved in DIIID, AUG and marginally in JET

C Gormezano, S Ide ITPA SSO&EP IEA-LT/ ITPA Collaboration 10 Joint Hybrid Experiments AUG/JET similarity scenarios. JET hybrid established DIIID Extrapolation from # to ITER shows high fluence possible

C Gormezano, S Ide ITPA SSO&EP IEA-LT/ ITPA Collaboration 11 Performance limits only done in DIIID Difficulties in JET (pressure of time, other priorities such as active control on very long pulses), JT-60 has not yet resumed operation, regime difficult to achieve in AUG (in addition problems with MSE)  N above no-wall limit. Not a large change with shaping, similar  N /li values No-wall  N limit and max. exp.  N decrease as q min increases. Very important result to be checked on other machines