Stock Photo - 19 November 2021, Mecklenburg-Western Pomerania, Greifswald: Christoph Marquardt,technician at the Max Planck Institute for Plasma Physics, checks carbon tiles in the ring-shaped plasma vessel of the research reactor ""Wendelstein 7-X"". For longer operation, 600 water cooling circuits have been installed recently. In Greifswald, fusion-relevant plasma is to be generated for half an hour rather than for seconds, as has been common practice up to now. The institute with the experimental facility ""Wendelstein 7-X"" for plasma generation is part of the worldwide development work on nuclear fusion as a possibility for energy generation. Photo: Stefan Sauer/dpa. - Greifswald/Mecklenburg-Western Pomerania/Germany