Properties of polycapillary optics dedicated to low-energy parallel-beam wavelength-dispersive spectrometers for synchrotron-based X-ray fluorescence study

The main advantage of wavelength-dispersive spectrometers applied in X-ray study is their high energy resolution. design and construction spectrometer, usually dedicated to the specific experimental systems, for example synchrotron based setups, need information about characteristics elements spectrometer such as optics elements, crystals detectors. Such can be obtained using Monte-Carlo simulations. In this paper, simulations tracing parallel-beam (PBWDS), equipped with polycapillary optics, are presented discussed. concentrates on description model, properties and, finally, track designed installed at ID21 beamline European Synchrotron Radiation Facility (ESRF, Grenoble, France). results were compared data different registered energies crystals, showing good agreement. showed that transmission tested level 15%, while divergence outgoing beam changes from 8 mrad 3 an increase photon 2 keV 10 keV. provides resolution 5 eV 33 range 1.4 - 6.5 developed simulation program successfully used conditions.