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Advanced tokamak regimes : Multi-machine comparison and prospects

Advanced tokamak regimes : Multi-machine comparison and prospects. Performance of advanced regime for steady-state operation present status of AT in terms of performance vs steady-state capability Map the existence domain of the Advanced scenario Condition for ITB formation and sustainment

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Advanced tokamak regimes : Multi-machine comparison and prospects

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  1. Advanced tokamak regimes : Multi-machine comparison and prospects • Performance of advanced regime for steady-state operation • present status of AT in terms of performance vs steady-state capability • Map the existence domain of the Advanced scenario • Condition for ITB formation and sustainment • ITB definition (ITB criterion First/Second order transition ?) • key normalised quantities for controlling the ITB formation and sustainment: q-profile, ExB shearing rate, fuelling ... • Predictive transport modelling scan in q-profile (weak/reversed shear) and possibly add a scan in r*? • Open challenges to extrapolate the advanced scenarios • list of the open challenge in the context of the proposed international collaborative experiments X. Litaudon

  2. 3.4  q95 < 4 ITER Q=5 (HITER89 xbN)/q295 bp Performance of advanced regime for steady-state operation 2.8  q95< 3.4 5  q95 < 6 q95  6 4  q95 < 5 +d > 0.4 X. Litaudon

  3. Map the existence domain of the Advanced scenario r* (MT)1/2/eRB 1/n* ITER Q=5 n* n T-2 Rqe-3/2 1/r* X. Litaudon

  4. Map the existence domain of the Advanced scenario bN bN Tio/Teo Mach number vtor/cs X. Litaudon

  5. Map the existence domain of the Advanced scenario bN H89 qax- EFIT MAG. Neo/NeGr X. Litaudon

  6. 3.3  q95  4.3 1.6  Ip  3.6 MA 0  PICRH  8.7 MW 4.8  PNBI 18.7 MW 21019  ne0  5.51019 m-3 ITB criterion Dimensionless criterion ITB onset time by criterion (s) Or non-stiff profiles ITB onset time (s) Tresset et al Nucl. Fus. (2002) 42 520 X. Litaudon

  7. Requested data • Standard Te, Ti, Vtor, Ne, q95 betan, H89, Lte • Modelling scan of q-profile OK scan of r* for a given q-profile ? X. Litaudon

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