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Title: Developing a Sagittally Focusing Double-Multilayer Monochromator

Abstract

We report the development of a sagittally focusing double multilayer monochromator to produce a spatially extended, wide-bandpass x-ray beam from intense synchrotron bending-magnet source at the Advanced Photon Source for ultrafast x-radiography and -tomography applications. This monochromator consists of the two W/B4C multilayers with a 25-Aa periodicity coated on Si single-crystal substrates. The second crystal is mounted on a saggitally focusing bender which can; dynamically change the bending radius of the crystal in order to focus the beam to various points along the beamline. With this new apparatus, it becomes possible to adjust the x-ray beam size to best match the area detector size and the object size to facilitate a more efficient data collection using ultrafast x-radiography and -tomography.

Authors:
; ; ; ;  [1]
  1. X-Ray Science Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, IL 60439 (United States)
Publication Date:
OSTI Identifier:
21052676
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 879; Journal Issue: 1; Conference: 9. international conference on synchrotron radiation instrumentation, Daegu (Korea, Republic of), 28 May - 2 Jun 2006; Other Information: DOI: 10.1063/1.2436216; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ADVANCED PHOTON SOURCE; BEAM BENDING MAGNETS; BEAM OPTICS; BEAM PRODUCTION; BORON CARBIDES; FOCUSING; INTERFACES; LAYERS; MONOCHROMATORS; MONOCRYSTALS; PERIODICITY; PHOTON BEAMS; SUBSTRATES; SYNCHROTRON RADIATION; TOMOGRAPHY; TUNGSTEN; X RADIATION

Citation Formats

Wang Yujie, Narayanan, Suresh, Liu Jinyuan, Shu Deming, and Wang Jin. Developing a Sagittally Focusing Double-Multilayer Monochromator. United States: N. p., 2007. Web. doi:10.1063/1.2436216.
Wang Yujie, Narayanan, Suresh, Liu Jinyuan, Shu Deming, & Wang Jin. Developing a Sagittally Focusing Double-Multilayer Monochromator. United States. doi:10.1063/1.2436216.
Wang Yujie, Narayanan, Suresh, Liu Jinyuan, Shu Deming, and Wang Jin. Fri . "Developing a Sagittally Focusing Double-Multilayer Monochromator". United States. doi:10.1063/1.2436216.
@article{osti_21052676,
title = {Developing a Sagittally Focusing Double-Multilayer Monochromator},
author = {Wang Yujie and Narayanan, Suresh and Liu Jinyuan and Shu Deming and Wang Jin},
abstractNote = {We report the development of a sagittally focusing double multilayer monochromator to produce a spatially extended, wide-bandpass x-ray beam from intense synchrotron bending-magnet source at the Advanced Photon Source for ultrafast x-radiography and -tomography applications. This monochromator consists of the two W/B4C multilayers with a 25-Aa periodicity coated on Si single-crystal substrates. The second crystal is mounted on a saggitally focusing bender which can; dynamically change the bending radius of the crystal in order to focus the beam to various points along the beamline. With this new apparatus, it becomes possible to adjust the x-ray beam size to best match the area detector size and the object size to facilitate a more efficient data collection using ultrafast x-radiography and -tomography.},
doi = {10.1063/1.2436216},
journal = {AIP Conference Proceedings},
number = 1,
volume = 879,
place = {United States},
year = {Fri Jan 19 00:00:00 EST 2007},
month = {Fri Jan 19 00:00:00 EST 2007}
}
  • The development of a sagittally focusing double-multilayer monochromator is reported, which produces a spatially extended wide-bandpass X-ray beam from an intense synchrotron bending-magnet source at the Advanced Photon Source, for ultrafast X-ray radiography and tomography applications. This monochromator consists of two W/B4C multilayers with a 25 {angstrom} period coated on Si single-crystal substrates. The second multilayer is mounted on a sagittally focusing bender, which can dynamically change the bending radius of the multilayer in order to condense and focus the beam to various points along the beamline. With this new apparatus, it becomes possible to adjust the X-ray beam sizemore » to best match the area detector size and the object size to facilitate more efficient data collection using ultrafast X-ray radiography and tomography.« less
  • The X-11A beamline at the NSLS has been upgraded to include a dynamic sagittally focusing second crystal in the monochromator, currently operating in the range 5.5--11 keV. The monochromator maintains a constant focus at the sample by adjustment of the bent crystal radius during the XAFS scan. The monochromator accepts 3.3 mrad of horizontal radiation and a spot size of {similar to}1.5 mm{sup 2} is achieved at the sample. The sagittally focusing mechanism in the monochromator is described and the results are presented of intensity profiles, spatial stability, and energy resolution between the energy ranges 6 and 10 keV, wheremore » the system performs most favorably. Intensity gains over unfocused operation are substantial and XAFS studies of dilute fluorescence samples reveal the expected {ital S}/{ital N} improvements, without any introduction of additional noise from the bending process. The mechanism operates with close to 100% efficiency between the energy ranges 6 and 8 keV. Bending errors hinder the performance at higher energies and also preclude effective harmonic rejection, by piezocrystal detuning, over the entire energy range.« less
  • Establishment of the parallelism between two axes, that of x rays and that of the cylinder made by a bent crystal, is found to be important when a sagittally focusing double-crystal monochromator is used. Detectable increase of reflection width and decrease of output intensity is observed when the angle between the above two axes becomes only 0.1{degree}. With the help of rotation stages to adjust the axis of the cylinder, the focus smaller than 1 mm is obtained up to 11 keV at BL-6B of the Photon Factory and about 3 mm is established up to 28 keV at NE1more » of the Accumulation Ring.« less
  • A continuous bent sagittally focusing monochromator has been designed and built. The monochromator is compatible with the present single-point bender apparatus designed for polygonal (ribbed) triangular sagittally focusing monochromators. This monochromator implements a new design concept taking advantage of a tapered rectangular wafer to allow for sagittal bending while simultaneously minimizing anticlastic bending. The monochromator was optimized to operate at x-ray energies in the range of 5 to 25 keV. The design was derived from finite element analysis using ANSYS. The monochromator performance was tested by means of an apparatus implementing an x-ray tube source and a double-crystal configuration. Thismore » method yields precise contour maps of the entire monochromator surface. Details of the monochromator design, test apparatus, and corresponding results will be presented. {copyright} {ital 1996 American Institute of Physics.}« less
  • No abstract prepared.