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Aspherical lens shapes for focusing synchrotron beams

DOI: 10.1107/S0909049512003020 DOI Help
PMID: 22514171 PMID Help

Authors: Manuel Sanchez Del Rio (ESRF, Grenoble, France) , Lucia Alianelli (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Synchrotron Radiation , VOL 19

State: Published (Approved)
Published: May 2012

Abstract: Aspherical surfaces required for focusing collimated and divergent synchrotron beams using a single refractive element (lens) are reviewed. The Cartesian oval, a lens shape that produces perfect point-to-point focusing for monochromatic radiation, is studied in the context of X-ray beamlines. Optical surfaces that approximate ideal shapes are compared. Results are supported by ray-tracing simulations. Elliptical lenses, rather than parabolic, are preferred for nano­focusing X-rays because of the higher peak and lower tails in the intensity distribution. Cartesian ovals will improve the gain when using high-demagnification lenses of high numerical aperture.

Journal Keywords: X-Ray Lens; Aspherical Lens; Aberrations; Ray-Tracing; Cartesian Oval.

Subject Areas: Physics

Technical Areas: Optics