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High-energy X-ray optics with silicon saw-tooth refractive lenses
KTH, School of Engineering Sciences (SCI), Physics, Physics of Medical Imaging.
2007 (English)In: Journal of Synchrotron Radiation, ISSN 0909-0495, E-ISSN 1600-5775, Vol. 14, 204-211 p.Article in journal (Refereed) Published
Abstract [en]

Silicon saw-tooth refractive lenses have been in successful use for vertical focusing and collimation of high-energy X-rays (50-100 keV) at the 1-ID undulator beamline of the Advanced Photon Source. In addition to presenting an effectively parabolic thickness profile, as required for aberration-free refractive optics, these devices allow high transmission and continuous tunability in photon energy and focal length. Furthermore, the use of a single-crystal material (i.e. Si) minimizes small-angle scattering background. The focusing performance of such saw-tooth lenses, used in conjunction with the 1-ID beamline's bent double-Laue monochromator, is presented for both short (similar to 1: 0.02) and long (similar to 1: 0.6) focal-length geometries, giving line-foci in the 2 mu m-25 mu m width range with 81 keV X-rays. In addition, a compound focusing scheme was tested whereby the radiation intercepted by a distant short-focal-length lens is increased by having it receive a collimated beam from a nearer ( upstream) lens. The collimation capabilities of Si saw-tooth lenses are also exploited to deliver enhanced throughput of a subsequently placed small-angular-acceptance high-energy-resolution post-monochromator in the 50-80 keV range. The successful use of such lenses in all these configurations establishes an important detail, that the pre-monochromator, despite being comprised of vertically reflecting bent Laue geometry crystals, can be brilliance-preserving to a very high degree.

Place, publisher, year, edition, pages
2007. Vol. 14, 204-211 p.
Keyword [en]
saw-tooth lenses, refractive lenses, high-energy X-rays, X-ray optics, asymmetric laue crystals, synchrotron-radiation, induced fluorescence, distributions, scattering, monochromators, deformation, beryllium, undulator, range
National Category
Atom and Molecular Physics and Optics Accelerator Physics and Instrumentation
URN: urn:nbn:se:kth:diva-16387DOI: 10.1107/s0909049507003962ISI: 000244207500004ScopusID: 2-s2.0-33847707397OAI: diva2:334429

QC 20100525

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2016-05-09Bibliographically approved

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Cederström, Björn
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Physics of Medical Imaging
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