Vorträge, Kolloquien

17:00 Uhr KIP, INF 227, Otto-Haxel-Hörsaal
Prof. Dr. Maximilian Fichtner Helmholtz Institute Ulm und Karlsruhe Institute of Technology (KIT), Energy Storage Group, Institute of Nanotechnology

Alternative battery chemistries - developments and challenges

The presentation will discuss current motivation and results of recent work on Li-free systems for electrochemical storage. While Na ion batteries are regarded as a “drop-in” technology and first comparably mature systems have already reached cell level, new ways to enabling Mg-Ca-, and Al-batteries are under investigation at the moment. Results from inorganic and organic electrode materials will be shown and challenges will be outlined that must be overcome to eventually enable powerful, sustainable and safe systems based on post-Li technology.

17:15 Uhr Neues Physikalisches Institut INF 226, Konferenzraum 1-3 (Room 00.101 bis 00.103)
Dr. Martin Aleksa CERN, Genf (Schweiz)

Future Circular Colliders

17:00 Uhr Kirchhoff-Institut, INF 227 SR 1.403, SR 1.403
Dr. Randall G. Hulet Department of Physics and Astronomy, Rice University, Houston

Quantum Magnetism with Ultracold Fermions

16:15 Uhr Philosophenweg 12, großer Hörsaal
John Kirk Max Planck Institut für Kernphysik, Heidelberg

Pulsar Winds

Pulsar Winds and the nebulae which they energize (PWN) are among the most enigmatic objects in astrophysics. They consist of a relativistic, magnetized, electron-positron plasma that forms a compact cloud surrounding young pulsars. Their nonthermal synchrotron and inverse-Compton emission is detected from the radio band to very high energy (TeV) gamma-rays, where they are the dominant galactic source population. The radio-to-infrared spectra of PWN are flat, indicating a remarkably efficient particle acceleration mechanism, able to transfer most of the system energy into a tiny fraction of particles. Despite decades of research, the mechanism responsible for accelerating these particles has remained elusive, and poses one of the greatest challenges in particle acceleration theory. In this talk I will give an introduction to the physics of pulsar winds, and describe recent work on the acceleration mechanisms thought to be at work. These include not only variants of the well-known first-order Fermi mechanism, but also "inductive acceleration", which may explain the mysterious gamma-ray flares from the Crab Nebula, discovered in 2011 by the Agile and Fermi satellites.