PSD–DCT coordination Meeting N52 - Second part of: Readiness of scaling laws and physics models for reactor design: how to reduce uncertainties

Europe/Berlin
Clarisse Bourdelle (CEA)

Summary wrapping up 3 PSD2 meetings: Nov 2024 (on L-H transition), April 2025 (Ip impact on conft, density limit, L-H transition) and May 2025 on density limit.

See the attached 3 slides for more complete summary. 

follow up actions:

  • L-H transition
    • Er profile formation accross separatrix: some on-going modelling vs expts, but might need further push/coordination. Need to plan dedicated PSD2 meeting? topic to be added in forthcoming TSVV call? 
    • qualitative trends in integrated mdoelling with ad hoc Er well will be explored (TSVV11 2026-27)
    • qualitative studies to be pushed in GRILLIX? how to compare to expts where NBI, equipartition etc add up? 
    • Plan JT60-SA high Ip low B contribution
    • ITPA database from 2008 does not include EAST/KSTAR. Need to push for such devices results inclusion (EUROfusion/ITPA interface?)
  • density limit
    • fluid and gyrokinetic flux driven edge/SOL modelling to be incitated at studying density limits. To be added in forthcoming TSVV call?
    • from nsep to the density profile: integrated modelling to be addressed in TSVV11 + ERG (proposed by Angioni/Grover). Including pellet vs gas fueling impact. To be included in forthcoming TSVV call? 
    • database sepOS exploration to be extended to other AUG Ip/B and to other devices to explore the absence of R scaling (NB sepOS multimachines for L-H transition also welcome). On longer term than on-going O. Grover ERG, need to plan a dedicated PSD2 meeting? synergy ITPA activity. 
    • explore density limit in L mode 'à la DIII-D delta<0' can we reach fGr=2?  WEST, AUG unfavor. Bxgrad(B)? other devices? 
  • Ip impact on H mode confinement / pedestal
    • GK database of in particular pedestal modelling done within TSVV1 and elsewhere to be built, shared. Needed to train/test reduced models. Could ask update to T. Görler in forthcoming PSD2? task to be taken over by new WP theory and modelling leader
    • transport in pedestal impact on Ip scaling: modelling prior to expts (H. Zohm thinking of master porject with M Dunne and J Puchmayr, could lead to PhD and expt design)
    • HRTS pedestal databse mining and comparaison with scalings (Cordey 2003, Puchmayr etc) M. Dunne withing WPDES / DCT for the moment.
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