D-Lecture: A Light and a Beam
The Advanced Photon Source facility illuminated by lightning. ( © Argonne National Laboratory
Alexander Zholents is the Director of the Accelerator Systems Division at Argonne National Laboratory.
Dr. Alexander Zholents from Argonne National Laboratory will present on 18th December 2014 his thoughts on "A Light and a Beam: a Theme with Variations". The presentation will be given at the lecture hall of the Wilhem-Conrad-Röntgen-Campus of HZB at 2 pm. After the presentation, we invite you to “Glühwein” and informal discussion.
What: D-Lecture
When: 14:00, 18. december 2014
Where: BESSYII, Lecture Hall
In his Distinguished Lecture, Aexander Zholents will discuss various techniques for making better beams of charged particles and beams better matched to applications. His examples will include the optical stochastic cooling, formation of the electron bunches for free-electron lasers, generation of x-rays pulses suitable for four-wave mixing experiments, laser-assisted electron beam conditioning for free-electron lasers, beam conditioning in storage rings for generation of picosecond x-ray pulses and more. Alexander Zholents is the Director of the Accelerator Systems Division at Argonne National Laboratory. His research interests are focused on design, construction, commissioning and operations of synchrotron radiation sources and x-ray free-electron lasers.
We are happy to inform you that we will provide you with a shuttle from Wannsee to Adlershof and return. If you like to use this shuttle for one-way, return or both, then please send an e-mail to jennifer.bierbaum@helmholtz-berlin.de. The shuttle from Wannsee will leave at 1 pm and return at 4 pm (sharp).
red.
https://www.helmholtz-berlin.de/pubbin/news_seite?nid=14108;sprache=en
- Copy link
-
Spin waves inside a nano-oscillator imaged for the first time
For the first time, researchers have directly imaged the magnetisation dynamics inside a spin Hall nano-oscillator — a nanoscale device that converts direct current into tunable microwave signals and is a promising building block for energy-efficient wireless communication and brain-inspired computing. A Swedish–German team led by the University of Gothenburg and Helmholtz-Zentrum Berlin (HZB) achieved this using time-resolved scanning transmission X-ray microscopy at the MAXYMUS instrument at BESSY II. The results, now published in Advanced Materials, reveal spin-wave features that had escaped previous, indirect measurement techniques.
-
BESSY II: High-resolution insights into individual biomolecules and catalysts
Very small biological samples and even individual biomolecules can now be examined under near-physiological conditions with high confidence at the BESSY II infrared beamline with a newly validated and improved technique: The nanoscale infrared spectroscopy (s-SNOM) with ultra-thin silicon-based membranes. An international team demonstrated after an initial proof of concept, that high-resolution (a few tens of nanometres) nano-IR measurements reliably match expected far-field IR spectra in an aqueous environment. This methodological advance provides a solid foundation for studying biomaterials or observing catalytic processes in a liquid environment.
-
New method shows how molecular switches are influenced by their neighbors
Researchers at Friedrich Schiller University Jena and the Helmholtz Centre Berlin (HZB) have, for the first time, been able to directly observe how the environment surrounding a molecular switch influences its electronic structure. Molecular switches are molecules that can be switched between two states by external influences such as changes in temperature—similar to a switch with the positions »On« and »Off«. Such molecules are being investigated as potential building blocks for future data storage devices or sensor materials. Using magnetic-field-dependent terahertz spectroscopy, the researchers have now, for the first time, been able to distinguish whether neighbouring molecules in a material are in the same or different states. The results have been published in the journal »Angewandte Chemie International Edition«.