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- Title
Focusing, collimation and flux throughput at the IMCA-CAT bending-magnet beamline at the Advanced Photon Source.
- Authors
KosheIev, Irina; Rong Huang; Graber, Timothy; Meron, Mati; Muir, J. Lewis; Lavender, William; Battaile, Kevin; Mulichak, Anne M.; Keefe, Lisa J.
- Abstract
The IMCA-CAT bending-magnet beamline was upgraded with a collimating mirror in order to achieve the energy resolution required to conduct highquality multi- and single-wavelength anomalous diffraction (MAD/SAD) experiments without sacrificing beamline flux throughput. Following the upgrade, the bending-magnet beamline achieves a flux of 8 x 1011 photons s-1 at 1 Å wavelength, at a beamline aperture of 1.5 mrad (horizontal) x 86 μrad (vertical), with energy resolution (limited mostly by the intrinsic resolution of the monochromator optics) δE/E = 1.5 x 10-4 (at 10 kV). The beamline operates in a dynamic range of 7.5-17.5 keVand delivers to the sample focused beam of size (FWHM) 240 μm (horizontally) x 160 μm (vertically). The performance of the 17-BM beamline optics and its deviation from ideally shaped optics is evaluated in the context of the requirements imposed by the needs of protein crystallography experiments. An assessment of flux losses is given in relation to the (geometric) properties of major beamline components.
- Subjects
MACROMOLECULES; CRYSTALLOGRAPHY; OPTICAL diffraction; ELECTRON beams; MAGNETIC flux; OPTICAL resolution; SOCIETIES
- Publication
Journal of Synchrotron Radiation, 2009, Vol 16, Issue 5, p647
- ISSN
0909-0495
- Publication type
Article
- DOI
10.1107/S0909049509022353