CNR ExploRA

Contributo in atti di convegno, 2021, ENG

Ideal ballooning modes in the ASDEX-Upgrade, JET and TCV pedestals

Dunne M.G.; Frassinetti L.; Lomanowski B.; Sheikh U.; Vianello N.; Wolfrum E.; Radovanovic L.; Carvalho I.S.; Frigione D.; Garzotti L.; Labit B.; Maslov M.; Rimini F.G.; Sergienko G.; Schneider P.A.; van Eester D.; The ASDEX Upgrade Team; The EUROfusion MST1 Team; JET contributors; the TCV Team

Max Planck Institute for Plasma Physics, Garching, Germany; Division of Fusion Plasma Physics, KTH Royal Institute of Technology, Stockholm SE; Oak Ridge National Laboratory, Oak Ridge, TN USA; Ecole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC), Lausanne, Switzerland; Consorzio RFX (CNR, ENEA, INFN, Università di Padova, Acciaierie Venete SpA), Padova - CNR ISTP - Istituto per la Scienza e Tecnologia dei Plasmi - Sede di Padova, Padova, Italy; Institute of Applied Physics, TU Wien, FusionOAW, Vienna, Austria; Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal; Università di Roma Tor Vergata, Roma, Italy; United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxon, UK; Forschungszentrum Julich GmbH, Institut fuer Energie- und Klimaforschung, Plasmaphysik, Jülich, Germany; Laboratory for Plasma Physics LPP-ERM/KMS, Brussels, Belgium.

A complete understanding of pedestal structure and limits remains an open question in fusion research. Research in this direction generally makes use of some generalised version of the EPED model[1]; transport mechanisms (which can have different drives for the particles and heat, and for ions and electrons) determine, in combination with the heat and particle sources, the profile gradients. In the "standard" case, the profiles continue to extend radially further inwards away from the separatrix until there is enough free energy in the pressure gradient (and associated driven edge current density) that a large magnetohydrodynamic (MHD) instability occurs, the so-called edge localised modes (ELMs). The onset of the ELM then determines the steepest and widest pedestal pressure profile.

47th EPS Conference on Plasma Physics, pp. 844–847, Virtual Conference, 21-25 June 2021