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Title: Beamline X29: A Novel Undulator Source for X-ray Crystallography

Abstract

A high-flux insertion device and beamline for macromolecular crystallography has been built at the National Synchrotron Light Source NSLS that employs a mini-gap undulator source developed by the NSLS. The mini-gap undulator at beamline X29 is a hybrid-magnet device of period 12.5 mm operating at proven gaps of 3.3-10 mm. The beamline provides hard X-rays for macromolecular crystallography experiments from the second and third harmonics over an energy range of 5-15 keV. The X-ray optics is designed to deliver intense and highly collimated X-rays. Horizontal focusing is achieved by a cryogenically cooled sagittally focusing double-crystal monochromator with {approx}4.1:1 demagnification. A vertical focusing mirror downstream of the monochromator is used for harmonic rejection and vertical focusing. The experimental station hosts an Area Detector Systems Quantum 315 CCD detector with 2.2 s readout time between exposures and Crystal Logic goniostat for crystal rotation and detector positioning. An auto-mounter crystal changer has been installed to facilitate the high-throughput data collection required by the major users, which includes structural genomics projects and the Macromolecular Crystallography Research Resource mail-in program. X29 is 103 times brighter than any existing bending-magnet beamline at NSLS with an actual flux of 2.5 x 10{sup 11} photons s{sup -1} throughmore » a 0.12 mm square aperture at 11.271 keV.« less

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
914413
Report Number(s):
BNL-78981-2007-JA
Journal ID: ISSN 0909-0495; JSYRES; TRN: US0802866
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: J. Synch. Rad.; Journal Volume: 13
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; APERTURES; CRYSTALLOGRAPHY; ENERGY RANGE; FOCUSING; HARMONICS; MIRRORS; MONOCHROMATORS; NSLS; OPTICS; PHOTONS; POSITIONING; ROTATION; WIGGLER MAGNETS; national synchrotron light source

Citation Formats

Shi,W., Robinson, H., Sullivan, M., Abel, D., Toomey, J., Berman, L., Lynch, D., Rosenbaum, G., Rakowsky, G., and et al.. Beamline X29: A Novel Undulator Source for X-ray Crystallography. United States: N. p., 2006. Web. doi:10.1107/S0909049506027853.
Shi,W., Robinson, H., Sullivan, M., Abel, D., Toomey, J., Berman, L., Lynch, D., Rosenbaum, G., Rakowsky, G., & et al.. Beamline X29: A Novel Undulator Source for X-ray Crystallography. United States. doi:10.1107/S0909049506027853.
Shi,W., Robinson, H., Sullivan, M., Abel, D., Toomey, J., Berman, L., Lynch, D., Rosenbaum, G., Rakowsky, G., and et al.. Sun . "Beamline X29: A Novel Undulator Source for X-ray Crystallography". United States. doi:10.1107/S0909049506027853.
@article{osti_914413,
title = {Beamline X29: A Novel Undulator Source for X-ray Crystallography},
author = {Shi,W. and Robinson, H. and Sullivan, M. and Abel, D. and Toomey, J. and Berman, L. and Lynch, D. and Rosenbaum, G. and Rakowsky, G. and et al.},
abstractNote = {A high-flux insertion device and beamline for macromolecular crystallography has been built at the National Synchrotron Light Source NSLS that employs a mini-gap undulator source developed by the NSLS. The mini-gap undulator at beamline X29 is a hybrid-magnet device of period 12.5 mm operating at proven gaps of 3.3-10 mm. The beamline provides hard X-rays for macromolecular crystallography experiments from the second and third harmonics over an energy range of 5-15 keV. The X-ray optics is designed to deliver intense and highly collimated X-rays. Horizontal focusing is achieved by a cryogenically cooled sagittally focusing double-crystal monochromator with {approx}4.1:1 demagnification. A vertical focusing mirror downstream of the monochromator is used for harmonic rejection and vertical focusing. The experimental station hosts an Area Detector Systems Quantum 315 CCD detector with 2.2 s readout time between exposures and Crystal Logic goniostat for crystal rotation and detector positioning. An auto-mounter crystal changer has been installed to facilitate the high-throughput data collection required by the major users, which includes structural genomics projects and the Macromolecular Crystallography Research Resource mail-in program. X29 is 103 times brighter than any existing bending-magnet beamline at NSLS with an actual flux of 2.5 x 10{sup 11} photons s{sup -1} through a 0.12 mm square aperture at 11.271 keV.},
doi = {10.1107/S0909049506027853},
journal = {J. Synch. Rad.},
number = ,
volume = 13,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}
  • We measured the spatial coherence length and incoherent source size of a hard x-ray undulator beamline at Pohang Light Source-II, the stored electron energy of which has been increased from 2.5 GeV to 3 GeV. The coherence length was determined by single-slit measurement of the visibility of the Fresnel diffraction pattern. The correlated incoherent source size was cross-checked for three different optics: the single slit, beryllium parabolic compound refractive lenses, and the Fresnel zone plate. We concluded that the undulator beamline has an effective incoherent source size (FWHM) of 540 μm (horizontal) × 50 μm (vertical)
  • A medium-length beamline with undulator source, BL20XU at SPring-8, was constructed, and opened to public use. The distance from source point to the end of the beamline is 248 m. By utilizing the long beam transport path, the beamline has advantages for experiment that requires high spatial coherence in hard X-ray regions.
  • The soft x-ray beamline 5U1 on the Daresbury Laboratory SRS currently uses a planar undulator, producing linearly polarized radiation in the range 100 to 1000 eV. The undulator is soon to be replaced by a variable-polarization device of the Apple II design. The aim is to produce circularly polarized light in the energy range 265 to 1000 eV, covering the K-edges of C, N and O, and the first row transition element L-edges. This will greatly enhance the provision of circularly polarized soft-x-rays on the SRS and open up new opportunities for experimenters. The device will also produce linear polarizationmore » with a selectable angle of polarization with respect to the orbit plane, which is currently unavailable on the SRS. In order to provide the coverage over this energy range, we are exploiting the relatively large emittance of the SRS to allow us to use the second and third harmonics even in circular polarization mode. This paper presents the expected beamline output in various polarization modes and the predicted degree of polarization.« less
  • The research philosophy and new capabilities installed at NSLS beamline X26-C to support electronic absorption and Raman spectroscopies coupled with X-ray diffraction are reviewed. This beamline is dedicated full time to multidisciplinary studies with goals that include revealing the relationship between the electronic and atomic structures in macromolecules. The beamline instrumentation has been fully integrated such that optical absorption spectra and X-ray diffraction images are interlaced. Therefore, optical changes induced by X-ray exposure can be correlated with X-ray diffraction data collection. The installation of Raman spectroscopy into the beamline is also briefly reviewed. Data are now routinely generated almost simultaneouslymore » from three complementary types of experiments from the same sample. The beamline is available now to the NSLS general user population.« less