[2001.02067]
Marcin Jakubowski, Ralf König, Oliver Schmitz, Yuhe Feng, Maciej Krychowiak, Matthias Otte, Felix Reimold, Andreas Dinklage, Peter Drewelow, Florian Effenberg, Yu Gao, Holger Niemann, Georg Schlisio, Andrea Pavone, Thomas Sunn Pedersen, Uwe Wenzel, Daihong Zhang, Sebastijan Brezinsek, Sergey Bozhenkov, Kai Jakob Brunner, Daniel Carralero, Ken Hammond, Golo Fuchert, Jens Knauer, Andreas Langenberg, Heinrich Laqua, Stefan Marsen, Novimir Pablant, Kian Rahbarnia, Lukas Rudichshauser, Torsten Stange, Glen Wurden, W7-X team
Reduction of particle and heat fluxes to plasma facing components is critical to achieve stable conditions for both the plasma and the plasma material interface in magnetic confinement fusion experiments. A stable and reproducible plasma state in which the heat flux is almost completely removed from the material surfaces was discovered recently in the Wendelstein 7-X stellarator experiment. At the same time also particle fluxes are reduced such that material erosion can be mitigated. Sufficient neutral pressure was reached to maintain stable particle exhaust for density control in this plasma state. This regime could be maintained for up to 28 seconds with a minimum feedback control.