Istituto dei materiali per l'elettronica ed il magnetismo     
Vagovic P., Korytár D., Mikulík P., Ferrari C. On the design of a monolithic 4-bounce high resolution X-ray monochromator. In: Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions With Materials and Atoms, vol. 265 pp. 599 - 604. Elsevier B.V, 2007.
A monolithic monochromator (+n, -n, -m, +m) made of a single block of Ge crystal designed for CoKa1 radiation was developed and tested numerically and experimentally by means of X-ray diffraction. The advantage of monolithic devices is their mechanical stability and the alignment of such optics is much easier than with polylithic optics, but the development of these devices is rather demanding. The presented monochromator belongs to a group of coplanar in-line devices, which means that the input beam is parallel with the output beam. For the estimation of the spectral and angular properties of a diffracted beam of this monochromator (such as bandpass width, output divergence and input acceptance) we used a numerical approach which we call spectral-angular function. It takes into account both the vertical and the horizontal divergence of the input radiation and uses two-beam X-ray dynamical theory of diffraction. Experimentally, the monochromator was tested by means of X-ray diffraction (synchrotron radiation testing) and the results from this characterization are presented. The influence of the vertical divergence on the spectral distribution of the diffracted beam is discussed and compared with previously published analytical results.
DOI: 10.1016/j.nimb.2007.09.037
Subject X-ray monochromator
High resolution
In-line optics
Spectral-angular function
Vertical dispersion
41.50.+h X-ray beams and x-ray optics (see also 07.85.Fv in instruments)
07.85.Nc X-ray and gamma-ray spectrometers
07.85.Qe Synchrotron radiation instrumentation

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