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  • Title: X-ray harmonics rejection on third-generation synchrotron sources using compound refractive lenses.
    Author: Polikarpov M, Snigireva I, Snigirev A.
    Journal: J Synchrotron Radiat; 2014 May; 21(Pt 3):484-7. PubMed ID: 24763636.
    Abstract:
    A new method of harmonics rejection based on X-ray refractive optics has been proposed. Taking into account the fact that the focal distance of the refractive lens is energy-dependent, the use of an off-axis illumination of the lens immediately leads to spatial separation of the energy spectrum by focusing the fundamental harmonic at the focal point and suppressing the unfocused high-energy radiation with a screen absorber or slit. The experiment was performed at the ESRF ID06 beamline in the in-line geometry using an X-ray transfocator with compound refractive lenses. Using this technique the presence of the third harmonic has been reduced to 10(-3). In total, our method enabled suppression of all higher-order harmonics to five orders of magnitude using monochromator detuning. The method is well suited to third-generation synchrotron radiation sources and is very promising for the future ultimate storage rings.
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