Göttingen 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
P: Fachverband Plasmaphysik
P 3: Magnetic Confinment Fusion/HEPP II
P 3.1: Hauptvortrag
Montag, 31. März 2025, 16:15–16:45, ZHG102
Flux Pumping for High Performance Tokamak Scenarios — •A. Bock1, A. Burckhart1, G. Pucella2, F. Auriemma2, D. Keeling3, D. King3, C. Challis3, V. Igochine1, R. Schramm1, J. Stober1, T. Pütterich1, R. Fischer1, J. Hobirk1, N. Hawkes3, H. Zhang1, E. Joffrin4, M. Baruzzo2, C. Piron2, P. Jacquet3, JET Contributors5, and the ASDEX Upgrade Team6 — 1MPI for Plasma Physics, Garching, Germany — 2ENEA, Frascati, Italy — 3CCFE, Abingdon, United Kingdom — 4CEA, Saint-Paul-lez-Durance, France — 5see author list of J. Mailloux et al. 2022 Nucl. Fusion — 6see author list of H. Zohm et al., 2024 Nucl. Fusion
Viable tokamak fusion power plant scenarios must exhibit high energy confinement and magnetohydrodynamic (MHD) stability. To this end, the anomalous redistribution of magnetic flux caused by a central continuous self-regulating saturated MHD mode ("flux pumping") can be of great benefit: it clamps the central safety factor q to 1, i.e. limits the core magnetic field line helicity, thereby preventing the occurrence of periodic reconnection events known as sawtooth crashes which can take place whenever q<1. This not only avoids the performance-degrading crashes, but can also prevent secondary resistive instabilities and their potentially disastrous consequences. Ultimately, flux pumping can result in a peaked plasma current profile just shy of sawteeth, giving additional stability against ideal MHD instabilities.
This contribution will present recent experimental evidence of flux pumping from the ASDEX Upgrade and JET tokamaks, including initial modelling results.
Keywords: magnetic confinement; core plasma physics; magnetic flux; anomalous redistribution; MHD stability