CNR ExploRA

Articolo in rivista, 2022, ENG, 10.1063/5.0072236

New H-mode regimes with small ELMs and high thermal confinement in the Joint European Torus

Garcia J.; de la Luna E.; Sertoli M.; Casson F.J.; Mazzi S.; Stancar Z.; Szepesi G.; Frigione D.; Garzotti L.; Rimini F.; van Eester D.; Lomas P.; Sozzi C.; Aiba N.; Dicorato M.; Mariani A.; Coelho R.; Frasinetti L.; Huijsmans G.T.A.; Liu F.; JET Contributors

CEA, IRFM, Saint Paul-lez-Durance, France; Laboratorio Nacional de Fusion, CIEMAT, Madrid, Spain; Culham Centre for Fusion Energy of UKAEA, Culham Science Centre, Abingdon, United Kingdom; Aix-Marseille Universite, CNRS PIIM, UMR 7345, Marseille, France; Jozef Stefan Institute, Ljubljana, Slovenia; National Agency for New Technologies, Energy and Sustainable Economic Development, ENEA, C.R. Frascati, Roma, Italy; LPP-ERM/KMS, EUROfusion Consortium Member-Trilateral Euregio Cluster, Brussels, Belgium; CNR ISTP - Istituto per la Scienza e Tecnologia dei Plasmi, Milano, Italy; National Institutes for Quantum and Radiological Science and Technology, Naka, Ibaraki, Japan; Instituto de Plasmas e Fusao Nuclear, Instituto Superior Tecnico, Universidade de Lisboa, Portugal; Division of Fusion Plasma Physics, KTH Royal Institute of Technology, Stockholm, Sweden; Eindhoven University of Technology, Eindhoven, The Netherlands.

New H-mode regimes with high confinement, low core impurity accumulation, and small edge-localized mode perturbations have been obtained in magnetically confined plasmas at the Joint European Torus tokamak. Such regimes are achieved by means of optimized particle fueling conditions at high input power, current, and magnetic field, which lead to a self-organized state with a strong increase in rotation and ion temperature and a decrease in the edge density. An interplay between core and edge plasma regions leads to reduced turbulence levels and outward impurity convection. These results pave the way to an attractive alternative to the standard plasmas considered for fusion energy generation in a tokamak with a metallic wall environment such as the ones expected in ITER.

Physics of plasmas 29 (3), pp. 032505-1–032501-10