High-energy x-ray optics with silicon saw-tooth refractive lenses.

Journal Article · Mon Jan 01 04:00:00 EST 2007 · J. Synchrotron Radiat.

DOI:https://doi.org/10.1107/S0909049507003962· OSTI ID:914913

Shastri, S D; Almer, J A; Ribbing, C R; Cederstrom, B C

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 ({approx}1:0.02) and long ({approx}1:0.6) focal-length geometries, giving line-foci in the 2 {micro}m-25 {micro}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.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; Swedish Foundation for Strategic Research; Swedish Research Council
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 914913
• Report Number(s): ANL/XSD/JA-58329
• Journal Information: J. Synchrotron Radiat., Journal Name: J. Synchrotron Radiat. Journal Issue: 2007 Vol. 14; ISSN 0909-0495; ISSN JSYRES
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

43 PARTICLE ACCELERATORS
ADVANCED PHOTON SOURCE
FOCUSING
GEOMETRY
KEV RANGE
LENSES
OPTICS
PERFORMANCE
PHOTONS
RADIATIONS
SCATTERING
SILICON
THICKNESS
WIGGLER MAGNETS