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P: Fachverband Plasmaphysik
P 2: Magnetic Confinement I/HEPP I
P 2.1: Hauptvortrag
Montag, 20. März 2023, 11:00–11:30, CHE/0091
Deuterium-Tritium Plasmas at JET with ITER-like Wall and the Role of Isotope Mass and Transport for H-mode Access — •Gregor Birkenmeier1,2 and JET Contributors3 for the JET L-H Transition Team collaboration — 1Max Planck Institute for Plasma Physics, Garching — 2Physik-Department, Technical University Munich, Garching — 3See J. Mailloux et al 2022 Nucl. Fus. 62 042026
More than 20 years after the last deuterium-tritium (D-T) experiments in magnetic confinement fusion research, the largest operating tokamak in the world, the Joint European Torus (JET) in Culham, UK, was operated with the reactor relevant D-T fuel mixture during the 2020/2021 experimental campaign. The experiments demonstrated that reactor relevant plasma scenarios can be successfully operated in metallic wall conditions and the record of controlled fusion energy production of 59 MJ was achieved in a steady plasma over five seconds. The experiments confirmed simulations of reactor-relevant plasma performance building confidence, that next step devices like ITER will perform as predicted. In addition to experiments maximizing the fusion power, further experiments in tritium containing plasmas allowed to study isotope effects in unprecedented detail. As one striking example, it was found that the power threshold to access the high confinement regime, which is considered as being mandatory for a sufficient performance of a reactor plasma, shows an unexpected isotope dependence in isotope mixtures. After the presentation of the highlights of recent D-T experiments, an explanation for the observed isotope effects is given and its impact on modelling is discussed.