Author: Kaprolat, A.
Paper Title Page
WEPA10 Design and Ray-Tracing of the BEATS Beamline of SESAME 246
  • G. Iori, M.M. Al Shehab, M.A. Al-Najdawi, A. Lausi
    SESAME, Allan, Jordan
  • M. Altissimo, I. Cudin
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • A. Kaprolat, J. Reyes-Herrera, P. Van Vaerenbergh
    ESRF, Grenoble, France
  • T. Kolodziej
    NSRC SOLARIS, Kraków, Poland
  Funding: EU H2020 framework programme for research and innovation. Grant agreement n°822535.
The BEAmline for Tomography at SESAME (BEATS) will operate an X-rayμtomography station providing service to scientists from archaeology, cultural heritage, medicine, biology, material science and engineering, geology and environmental sciences*. BEATS will have a length of 45 m with a 3-pole-wiggler source (3 T peak magnetic field at 11 mm gap). Filtered white and monochromatic beam (8 keV to 50 keV, dE/E: 2% to 3% using a double-multilayer-monochromator) modalities will be available. In this work we present the beamline optical design, verified with simulation tools included in OASYS**. The calculated flux through 1 mm2 at the sample position will be as high as 8.5×109 Ph/s/mm2 in 0.1% of the source bandwidth, for a maximum usable beam size of 70×15 mm2. Beam transverse coherence will be limited to below 1 µm by the horizontal size of the X-ray source (~2 mm FWHM). For phase contrast applications requiring enhanced coherence, front end slits can be closed to 0.5 mm horizontally, with a reduction of the available beam size and photon flux. The BEATS beamline will fulfill the needs of the tomography community of SESAME.
* H2020 project BEATS, Technical Design Report (July 2020).
** L. Rebuffi and M. Sanchez del Rio, Proc. SPIE 10388: 130080S (2017).
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About • paper received ※ 14 July 2021       paper accepted ※ 27 September 2021       issue date ※ 07 November 2021  
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An FEA Investigation of the Vibration Response of the BEATS Detector Stage  
  • T.F. Mokoena, A. Kaprolat, P. Van Vaerenbergh
    ESRF, Grenoble, France
  • M. Bhamjee, S.H. Connell
    University of Johannesburg, Johannesburg, South Africa
  • G. Iori
    SESAME, Allan, Jordan
  As for all Synchrotron Radiation based installations, floor vibrations lead to unreliable results if transmitted to sensible equipment like sample environment and detection systems. It is important to design the optical and experimental equipment of a beamline in a way to minimize the effect of the vibrations. This project investigates the design of the detector stage in SESAME’s tomography beamline BEATS by using random vibration analysis to determine the rigidity of the structure. The design analysis of the detector stage takes the approach of using an existing installation at beamline ID28 of the European Synchrotron Radiation Facility by measuring the power spectrum density of the floor on which the structure is mounted on as well as the response of the structure stage as it is subjected to an excitation from ambient floor noise. A finite element analysis numerical model was established and validated against the experimental data. Once the model is validated within acceptable range, the technique will be applied to the BEATS detector stage design by applying the floor power spectrum density of the SESAME synchrotron and calculating the response of the structure. It is assumed that the random vibration process in this case follows a Gaussian normal distribution. The response power spectrum density Root Mean Square value at the location of interest should be at least 6 times less than the pixel size of the camera that will be used in detector. For the ID28 case, the model was validated by comparing the natural frequency measured and the experimental output RMS value against the model output RMS value. The model natural frequencies deviated from the experimental results by 4.53% and the model RMS values deviated from the experimental results by 1.91%.  
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