Author: Cianciosi, F.
Paper Title Page
MOIO02 BM18, the New ESRF-EBS Beamline for Hierarchical Phase-Contrast Tomography 1
  • F. Cianciosi, A.-L. Buisson, P. Tafforeau, P. Van Vaerenbergh
    ESRF, Grenoble, France
  BM18 is an ESRF-EBS beamline for hierarchical tomography, it will combine sub-micron precision and the possibility to scan very large samples. The applications will include biomedical imaging, material sciences and cultural heritage. It will allow the complete scanning of a post-mortem human body at 25 µm, with the ability to zoom-in in any location to 0.7 µm. BM18 is exploiting the high-energy-coherence beam of the new EBS storage ring. The X-ray source is a short tripole wiggler that gives a 300mm-wide beam at the sample position placed 172m away from the source. Due to this beam size, nearly all of the instruments are devel-oped in-house. A new building was constructed to ac-commodate the largest synchrotron white-beam Experi-mental Hutch worldwide (42x5-6m). The main optical components are refractive lenses, slits, filters and a chop-per. There is no crystal monochromator present but the combination of the optical elements will provide high quality filtered white beams, as well as an inline mono-chromator system. The energy will span from 25 to 350 keV. The Experimental Hutch is connected by a 120m long UHV pipe with a large window at the end, followed by a last set of slits. The sample stage can position, rotate and monitor with sub-micron precision samples up to 2,5x0.6m (H x Diam.) and 300kg. The resulting machine is 4x3x5m and weighs 50 tons. The girder for detectors carries up to 9 detectors on individual 2-axis stages. It moves on air-pads on a precision marble floor up to 38m behind the sample stage to perform phase contrast imag-ing at a very high energy on large objects. The commissioning is scheduled for the beginning of 2022; the first ’friendly users’ are expected in March 2022 and the full operation will start in September 2022.  
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About • paper received ※ 17 July 2021       paper accepted ※ 03 November 2021       issue date ※ 05 November 2021  
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