5 September 2014 X-ray harmonics suppression by compound refractive lenses
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X-ray refractive lenses were successfully applied to harmonics rejection by using the fact that focal distance of the lens is energy-dependent. Spatial separation of energy spectrum by focusing the fundamental harmonic at the focal point and suppressing the unfocused high-energy radiation with a screen absorber or slit was achieved by usage of an off-axis illumination of refractive lenses at the ESRF ID06 beam-line. The presence of the 3rd harmonic has been reduced down to 10-3 using this technique and down to 10-5 by additionally using of monochromator detuning. The method is well suited to third-generation synchrotron radiation sources and very promising at the future ultimate storage rings.
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Maxim Polikarpov, Maxim Polikarpov, Irina Snigireva, Irina Snigireva, Anatoly Snigirev, Anatoly Snigirev, "X-ray harmonics suppression by compound refractive lenses", Proc. SPIE 9207, Advances in X-Ray/EUV Optics and Components IX, 920711 (5 September 2014); doi: 10.1117/12.2060534; https://doi.org/10.1117/12.2060534

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