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Brilliant perspectives
Date:11/26/2007

analyses of nanoparticles or measurements with a spatial resolution in the 10-nanometre range will benefit from the extremely well focusable X-rays.

For the new light source, DESY is completely rebuilding the existing 2.3-kilometre-long ring accelerator PETRA. The new experimental hall will be almost 300 metres in length, and its shape will conform to the curved contour of the accelerator ring. An area of about 10 000 square metres will contain 14 experimental stations that can accommodate up to 30 experiments.

The PETRA III project is progressing very dynamically, said Project Leader Prof. Edgar Weckert. In parallel to the construction of the experimental hall, weve started to fit the 2.3-kilometre-long PETRA storage ring with completely renewed components. In addition, we established the scientific programmes of all the experiments, and we are now preparing them vigorously.

Exploring the nanoworld with PETRA III is also a challenge with respect to construction technique. The hall floor is cast as a single one-metre-thick concrete slab that will support both the accelerator and the experiments. The slab is isolated from the vibrations of the rest of the building. To also minimize the influence that the building could exert through the ground on the hall floor, the latter is supported on sleeved piles extending 20 metres below the surface. Anchored in concrete at that depth, these supports are surrounded by a low-friction casing preventing direct contact with the upper layers of the soil. This allows any force acting on the piles to be transferred deeper into the ground and thus reduces distortions at the surface.

The worldwide finest X-ray beam offered by PETRA III is generated by means of special undulators, long magnet arrangements that produce a beam of very high brilliance. In order to guarantee that the optimal radiation can be delivered at the experimental stations for the most varied applications, the future users from u
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Contact: Thomas Zoufal
thomas.zoufal@desy.de
49-408-998-1666
Helmholtz Association of German Research Centres
Source:Eurekalert

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