A Simple X-Ray Focusing Mirror Using Float Glass

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In our recent x-ray photon correlation spectroscopy (speckle) experiments at NSLS, one of the challenges is to increase the coherent photon flux through a pinhole, whose size is chosen to match the beam`s horizontal transverse coherence length {ital l{sub h}}. We adopted an approach to vertically focus the x-ray beam so as to match its vertical transverse coherence length {ital l{sub v}}, (at NSLS X13, {ital l{sub v}}{approximately} 50{ital l{sub h}}, {ital l{sub h}}{approximately} 12 {mu}m at 3 KeV) with {ital l{sub h}}. By demagnifying the vertical size by a factor of {ital l{sub v}/l{sub h}}, we expect to increase ... continued below

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10 p.

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Yin, Z; Berman, L.; Siddons, D.P.; Dierker, S & Dufresne, E. October 1, 1996.

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Description

In our recent x-ray photon correlation spectroscopy (speckle) experiments at NSLS, one of the challenges is to increase the coherent photon flux through a pinhole, whose size is chosen to match the beam`s horizontal transverse coherence length {ital l{sub h}}. We adopted an approach to vertically focus the x-ray beam so as to match its vertical transverse coherence length {ital l{sub v}}, (at NSLS X13, {ital l{sub v}}{approximately} 50{ital l{sub h}}, {ital l{sub h}}{approximately} 12 {mu}m at 3 KeV) with {ital l{sub h}}. By demagnifying the vertical size by a factor of {ital l{sub v}/l{sub h}}, we expect to increase the intensity of the x-rays through the pin hole by the same factor while keeping the beam coherent. A piece of commercial 3/8 inch thick float glass, by virtue of its low surface roughness ({approximately}3{Angstrom} rms), good reflectivity in the low photon energy range of interest and low cost, was chosen as the mirror material. A computer controlled motorized bender with a four point bending mechanism was designed and built to bend the float glass to a continuously variable radius of curvature from {approximately}700 m (intrinsic curvature of the glass surface) to < 300 m, measured with the Long Trace Profiler at the BNL Metrology Lab. This mirror bender assembly allows us to continuously change the focal length of the x-ray mirror down to 0.5 m under our experimental conditions. At the NSLS X13 Prototype Small Gap Undulator (PSGU) beamline, we were able to focus the x-ray beam from a vertical size of 0.5 mm to {approximately} 25{mu}m at the focal point 54 cm from the mirror center, thus increasing the photon flux density by a factor of 20. Results also show that, as expected, at an incident angle of 9 mrad, the mirror cuts off the harmonics of the undulator spectrum, leaving a clean 3 KeV fundamental for our experiments.

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10 p.

Notes

OSTI as DE97001548

Source

  • Denver `96: 1. conference on space processing of materials, at SPIE International Society for Optical Engineering (SPIE) annual international symposium on optical science, engineering, and instrumentation, Denver, CO (United States), 4-9 Aug 1996

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  • Other: DE97001548
  • Report No.: BNL--63583
  • Report No.: CONF-960848--36
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 432844
  • Archival Resource Key: ark:/67531/metadc688794

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • October 1, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Aug. 23, 2016, 3:21 p.m.

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Yin, Z; Berman, L.; Siddons, D.P.; Dierker, S & Dufresne, E. A Simple X-Ray Focusing Mirror Using Float Glass, article, October 1, 1996; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc688794/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.