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Title: Design and Performance of the Compact YAG Imaging System for Diagnostics at GMCA Beamlines at APS

Abstract

A compact YAG (Chromium Doped Yttrium Aluminum Garnet - Cr4+:YAG) imaging system has been designed as a diagnostic tool for monochromatic x-rays emanating from the first 'Hard' x-ray dual-canted undulator at the Advanced Photon Source at Argonne National Laboratory. This imaging system consists of a flat YAG crystal, right angle prism/mirror, video camera and monitor. A flat YAG crystal with a diameter of 10 mm has been installed in vacuum and positioned downstream of the monochromator of the insertion device beamline. Another 20 mm diameter YAG crystal has been installed in vacuum after the horizontal deflecting mirrors of the second insertion device beamline. CCD cameras are mounted in air close to the window of the vacuum ports to image the fluorescence of the YAG crystals. An additional 25 mm diameter YAG crystal has been used for K-B (Kirkpatrick-Baez) mirror focusing and beamline alignment. These YAG imaging systems have greatly facilitated beamline commissioning as well as sample alignment to the x-ray beam in the macromolecular crystallography endstation. An overview of the optics design, mechanical design and the performance of these devices will be presented in the paper.

Authors:
; ; ;  [1]
  1. GM/CA CAT, Biosciences Division, Argonne National Laboratory, Argonne, IL 60439 (United States)
Publication Date:
OSTI Identifier:
21049292
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: 10.1063/1.2436327; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ADVANCED PHOTON SOURCE; ALIGNMENT; CHARGE-COUPLED DEVICES; CHROMIUM; COMMISSIONING; CRYSTALS; DESIGN; DOPED MATERIALS; FLUORESCENCE; FOCUSING; HARD X RADIATION; IMAGES; MIRRORS; MONOCHROMATIC RADIATION; MONOCHROMATORS; NEODYMIUM LASERS; PERFORMANCE; TELEVISION CAMERAS; WIGGLER MAGNETS

Citation Formats

Xu Shenglan, Fischetti, Robert F., Benn, Richard, and Corcoran, Stephen. Design and Performance of the Compact YAG Imaging System for Diagnostics at GMCA Beamlines at APS. United States: N. p., 2007. Web. doi:10.1063/1.2436327.
Xu Shenglan, Fischetti, Robert F., Benn, Richard, & Corcoran, Stephen. Design and Performance of the Compact YAG Imaging System for Diagnostics at GMCA Beamlines at APS. United States. doi:10.1063/1.2436327.
Xu Shenglan, Fischetti, Robert F., Benn, Richard, and Corcoran, Stephen. Fri . "Design and Performance of the Compact YAG Imaging System for Diagnostics at GMCA Beamlines at APS". United States. doi:10.1063/1.2436327.
@article{osti_21049292,
title = {Design and Performance of the Compact YAG Imaging System for Diagnostics at GMCA Beamlines at APS},
author = {Xu Shenglan and Fischetti, Robert F. and Benn, Richard and Corcoran, Stephen},
abstractNote = {A compact YAG (Chromium Doped Yttrium Aluminum Garnet - Cr4+:YAG) imaging system has been designed as a diagnostic tool for monochromatic x-rays emanating from the first 'Hard' x-ray dual-canted undulator at the Advanced Photon Source at Argonne National Laboratory. This imaging system consists of a flat YAG crystal, right angle prism/mirror, video camera and monitor. A flat YAG crystal with a diameter of 10 mm has been installed in vacuum and positioned downstream of the monochromator of the insertion device beamline. Another 20 mm diameter YAG crystal has been installed in vacuum after the horizontal deflecting mirrors of the second insertion device beamline. CCD cameras are mounted in air close to the window of the vacuum ports to image the fluorescence of the YAG crystals. An additional 25 mm diameter YAG crystal has been used for K-B (Kirkpatrick-Baez) mirror focusing and beamline alignment. These YAG imaging systems have greatly facilitated beamline commissioning as well as sample alignment to the x-ray beam in the macromolecular crystallography endstation. An overview of the optics design, mechanical design and the performance of these devices will be presented in the paper.},
doi = {10.1063/1.2436327},
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}
}
  • No abstract prepared.
  • The Structural Biology Center-CAT will develop and operate a sector of the APS as a user facility for studies in macromolecular crystallography. The techniques applied will include multiple-energy anomalous dispersion (MAD) phasing and polychromatic (Laue) data collection. Data will be recorded on a high resolution CCD-area detector. The SBC is constructing two beamlines, one for radiation from an undulator and one for radiation from a bending magnet. The x ray optics of both beamlines are designed to produce a highly demagnified image of the source in order to match the focal size with the sizes of the sample and themore » resolution element of the detector. Vertical focusing is achieved by a flat, cylindrically bent mirror. Horizontal focusing is achieved by sagittally bending the second crystal of a double crystal-monochromator. The double-crystal monochromators of both beamlines have a constant exit height output beam. On the undulator beamline, two double-crystal monochromators are installed in series{emdash}one with Si-111 crystals and the second with Si-220 crystals{emdash}in order to facilitate quick change between high flux and narrow bandwidth. For the heat-loaded first crystals, the liquid-nitrogen-cooled, thin-web design being developed by the APS has been adopted. On the bending magnet beamline, three crystals (Si-111, Si-220, Si-400) are mounted side-by-side on the first crystal stage and translated into the beam is required. {copyright} {ital 1996 American Institute of Physics.}« less
  • A modular filter has been designed for the white-beam undulator/wiggler beamlines at the Advanced Photon Source. For a typical hard x-ray application, the filter assembly consists of four filter banks, and each bank has five beam apertures. Therefore a maximum of 625 filter combinations is mechanically possible. To prevent any mistaken setup, which could either damage the filter itself or downstream optical components, a programmable logic controller (PLC) based protection system has been designed. Fuzzy logic was used in this system to limit the memory size and improve the system performance. Ten different storage-ring beam currents and ten insertion-device gapmore » setups have been chosen to cover a large dynamic operation range. Aspects of the system fuzzy logic design as well as an example of the calculated results for the control database are presented in this paper. {copyright} {ital 1996 American Institute of Physics.}« less
  • A simple compact monochromatic imaging system for plasma diagnostics isdescribed. The system consists of a small monochromator, single lens, and videocamera.
  • We present the design, performance, and recent upgrade of a high-resolution, high-charge-sensitivity imaging camera and beam position monitor (BPM) system for the APS linac beam profile measurement. Visible light is generated from the incoming electron beam using standard YAG or optical transition radiation (OTR) converter screens. Two CCD cameras share the light through a beam splitter, each with its own imaging optics. Normally, one camera is configured with high magnification and the other with large field of view. In a different lens configuration, one of the cameras focuses at the far field, allowing the measurement of beam divergence using anmore » OTR screen, while the other camera simultaneous measures the beam size. A four-position actuator was installed recently to provide the option of two screens, a wakefield shield, and an in situ calibration target. A compact S-band beam position monitor electrode was designed to mount directly on the flag. The BPM rf circuit was fabricated from a machinable ceramic (MACOR) cylinder substrate, and the copper electrodes were deposited on the substrate. The new design and precision fabrication process make it viable to explore more complex microstrip components printed on the substrate and higher frequency applications. The proximity of the BPM and the camera (< 5 cm) will provide a precise calibration platform to study shot-to-shot jitter, long-term stability of both systems, and the dependence of BPM signal on beam properties (size, charge distribution) due to nonlinearity.« less