Design of the High Energy Materials Science Beamline at PETRA III

The High Energy Materials Science Beamline HEMS at PETRA III will have a main energy of 100 keV, tunable in the range 50 to 300 keV , and will be optimized for sub-micrometer focusing with Compound Refractive Lenses (CRLs) and Kirkpatrick-Baez (KB) mirrors.

Design, construction, operation and main funding are the responsibility of the Helmholtz-Zentrum Geesthacht. Approximately 70 % of the beamtime will be dedicated to Materials Research, the rest reserved for "general physics” experiments supported by DESY.

The materials science activities will be threefold:

1. Fundamental research will encompass metallurgy, physics, chemistry, biology etc. which are more and more merging. First experiments are planned for the investigation of the relation between macroscopic and micro-structural properties of polycrystalline materials, grain-grain-interactions, recrystallisation processes, and the development of new & smart materials or processes.
   
   

2. Applied research for manufacturing process optimization will benefit from high flux in combination with ultra-fast detector systems allowing complex and highly dynamic in-situ studies of microstructural transformations, e.g. during welding processes. The beamline infrastructure will allow easy accommodation of large user provided equipment (an in-situ friction stir welding device for measurements at synchrotron radiation sources has been built by Helmholtz-Zentrum Geesthacht and tested at HARWI-II).
   
   

3. Experiments targeting the industrial user community will be based on well established techniques with standardised evaluation, allowing "full service" measurements. Environments for strain mapping on large structural components up to 1 t will be provided as well as automated investigations of large sample numbers, e.g. tomography & texture determination.

After a first workshop in June 2006 in order to address the future user community and a second workshop in November 2007 in order to optimize the optics concept, the final design for the beamline (P07 in sector 5 of the PETRA III experimental hall 47c), consists of a five meter in-vacuum undulator source (U19-5) – currently a standard PETRA undulator is installed till delivery of U19-5 foreseen in winter of 2011, the main optics hutch (OH1) , an in-house test facility (EH1) and three independent experimental hutches EH2, EH3 and EH4 working alternatively, plus additional focussing optics hutches (OH2, OH3) with set-up and storage space for long-term experiments as sketched in the picture.

In 2011 the experimental hutches EH2 with OH2 and EH3 with OH3 will be available for user experiments. EH4 with its micro-tomography set-up will follow in the beginning of 2012 and with its mapper set-up in the second half of 2012. The Test Facility EH1 is not available for external users.