Author: Ducotte, L.    [Ducotté, L.]
Paper Title Page
ESRF Double Crystal Monochromator - Design and Working Modes  
  • R. Baker, R. Barrett, P. Bernard, G. Berruyer, J. Bonnefoy, M. Brendike, L. Ducotté, H. Gonzalez, T. Roth, P. Tardieu
    ESRF, Grenoble, France
  The ESRF-Double Crystal Monochromator (ESRF-DCM) has been designed and developed in-house to enable several spectroscopy beamlines to exploit the full potential of the ESRF-EBS upgrade, implemented in 2019 - 2020. To reach concomitant beam positioning accuracy and stability, particular attention has been paid to mechanical and thermal stability, which has imposed the implementation of several innovative design concepts. To meet the extremely challenging specifications of the ESRF DCM implies not only high precision mechanical design, but also a mechatronic system enabling the active correction of the parallelism between crystals. Online metrology, associated with a controller capable of real-time signal processing have been implemented. A prototype has been partially validated and production of the first batch (two ESRF DCMs) is in progress. This presentation will give an overview of the DCM design principles and operating modes, then show how the calibration process is performed in situ on the beamline, using x-rays and associated instrumentation, and will explain the working principle of the active correction mode. To conclude, some characterisations of the DCM performances with x-rays will be presented.  
slides icon Slides MOOB01 [3.202 MB]  
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