Upcoming events and seminars
We believe in our duty to share knowledge through weekly seminars, regularly workshops and other events. Our weekly seminars at DIFFER (filter the list below for seminars only) cover a wide range of topics and are open to everybody. Please, read more about our seminars and specific information for external visitors at Upcoming seminars.
Filter for seminars only
List all past events organized at DIFFER
List all past seminars organized at DIFFER
Christopher Smiet
September 6th 2017
Seminar
Magnetic helicity, a measure for the linking and knotting of magnetic field lines, is a conserved quantity in Ideal MHD. In the presence of resistivity, helicity constrains the rate at which magnetic energy can be dissipated. When a localized, helical magnetic field is set to relax in a low-resistance high-beta plasma, the magnetic pressure drives the plasma to expand whilst the helicity is still approximately conserved. Using numerical simulations I show how this interplay gives rise to a novel MHD equilibrium: the initially linked field lines self-organize to form a structure where field... Read more
Gert Jan Kramer
September 7th 2017
Seminar
Abstract will follow soon
Hans Goedbloed
September 14th 2017
Seminar
The extensive studies of MHD instabilities in thermonuclear magnetic confinement experiments, in particular of the tokamak as the most promising candidate for a future energy producing machine, have led to an ‘intuitive’ description based on the energy principle that is very misleading for most astrophysical plasmas. The ‘intuitive’ picture almost directly singles out the dominant stabilizing field line bending energy of the Alfven waves and, consequently, concentrates on expansion schemes that minimize that contribution. This happens when the wave vector k0 of the perturbations, on average,... Read more
