The first measuring period for external users at the new X-ray radiation source VUV-FEL at DESY in Hamburg has been successfully concluded. Since its official startup in August 2005, a total of 14 research teams from ten countries have carried out first experiments using the facility’s intense laser beam. “Both the external researchers and the DESY team gained most valuable experience with the new machine,” DESY research director Professor Jochen Schneider comments. “As a worldwide unique pioneering facility for free-electron lasers for the generation of X-ray radiation, the VUV-FEL for example offers completely new possibilities to trace various processes on extremely short time scales. The currently made first studies verify that these X-ray sources of the future will open another fascinating window for research.”
The free-electron laser VUV-FEL is the worldwide first and until 2009 the only source of intense laser radiation in the ultraviolet and the soft X-ray range. The 300-meter-long facility at DESY generated laser flashes with a wavelength of 32 nanometers (billionths of a meter) for the first time in January 2005 – this is the shortest wavelength ever achieved with a free-electron laser. Since its official startup as a user facility in August 2005, the VUV-FEL has been at the disposal of research groups from all over the world for experiments in areas such as cluster physics, solid state physics, plasma research and biology. Four experimental stations are currently available, at which different instruments can be operated alternately.
“The VUV-FEL is an absolute novelty: for the first time, experiments with intense, pulsed laser radiation can now be carried out at these short wavelengths,” explains DESY physicist Josef Feldhaus, who is in charge of the coordination of the experiments at the VUV-FEL. “The researchers are thus venturing into completely uncharted terrain, of which nobody has any experience yet.” Most groups therefore came to Hamburg with newly constructed instruments that were specially designed to fit the unique properties of the VUV-FEL radiation. With great success: “Despite the complexity of the new experimental equipment and the teething troubles of a completely new radiation source that is not yet running stably on a routine basis, most of the groups were very satisfied. They went home with discs full of data, which they are now evaluating in detail.”
Petra Folkerts | alfa
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Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
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