Speaker
Description
The ESRF has designed and developed a Double Crystal Monochromator (ESRF-DCM) to enable several spectroscopy beamlines to exploit the full potential of the ESRF-EBS, in particular the capability to perform fast and accurate energy scanning. 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. The extremely challenging specifications of the ESRF DCM necessitate not only high precision mechanical design, but also a mechatronic system enabling active correction of the parallelism between first and second crystals. Online metrology has been implemented, associated with a controller capable of real-time signal processing. From the scientist's initial request, the purpose of this presentation is to give an overview of the ESRF DCM design principles, integration and operating modes, showing how the calibration process is performed on the beamline, using x-rays and associated instrumentation, and will explain the working principle of the active correction mode.
