Interplay between core, edge and scrape-off layer in turbulent magnetised plasmas

Guilhem Dif-Pradalier (1, 2) , Ph. Ghendrih (1, 2) , Y. Sarazin (1, 2) , X. Garbet (1, 2) , V Grandgirard (1, 2) , Y. Munschy (1, 2) , R. Varennes (1, 2) , L. Vermare , Y. Camenen (3) , F. Widmer (3)

1 CEA - Commissariat à l'énergie atomique et aux énergies alternatives
2 IRFM - Institut de Recherche sur la Fusion par confinement Magnétique
3 PIIM - Physique des interactions ioniques et moléculaires

The present manuscript is meant to provide a companion pedagogical approach to an information theoretic measure, the "Transfer Entropy" method, useful to assess causality in complex (time series) datasets. This manuscript describes useful basics for the forthcoming discussion on the causal chain of events that leads to the onset of a spontaneous and stable edge transport barrier in flux-driven gyrokinetics when core, edge and scrape-off layer regions self-consistently interplay.

Domains: Physics [physics]; Physics [physics]; Physics [physics]; Plasma Physics [physics.plasm-ph]

Guilhem Dif-Pradalier, Ph. Ghendrih, Y. Sarazin, X. Garbet, V Grandgirard, et al.. Interplay between core, edge and scrape-off layer in turbulent magnetised plasmas: Lessons learnt from an information theoretic measure, the "transfer entropy" to assess causality in nonlinear plasma dynamics. FEC 2020 - IAEA Fusion Energy Conference, May 2021, E-Conference, France. ⟨cea-03287143⟩