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D2AM, a beamline with a high-intensity point-focusing fixed-exit monochromator for multiwavelength anomalous

J L Ferrer1, J P Simon, J F Bérar

  • 1Laboratoire de Cristallographie et Cristallogénèse des Protéines (LCCP), Institut de Biologie Structurale Jean-Pierre Ebel, 41 Avenue des Martyrs, 38027 Grenoble CEDEX 1, France.

Journal of Synchrotron Radiation
|May 12, 2006
PubMed
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The D2AM beamline at ESRF offers high-intensity X-ray capabilities for both biological macromolecule crystallography and materials science. Its advanced focusing optics and automated alignment enable precise multiwavelength anomalous diffraction studies.

Area of Science:

  • Synchrotron Radiation
  • Crystallography
  • Materials Science

Background:

  • The D2AM beamline at the European Synchrotron Radiation Facility (ESRF) is a versatile French CRG (Collaborative Research Group) facility.
  • It is designed for both biological macromolecule crystallography and materials science, utilizing X-rays from a bending magnet.

Purpose of the Study:

  • To detail the technical specifications and capabilities of the D2AM beamline.
  • To highlight its suitability for single-wavelength and multiwavelength anomalous diffraction (MAD) studies.
  • To emphasize its advanced optical system for high-intensity, focused X-ray beams.

Main Methods:

  • Utilizes an Si[111] two-crystal monochromator for X-ray energy selection (6.5–17 keV).
  • Employs a focusing system with two curved mirrors and a sagittally focusing monochromator crystal.

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  • Features automated alignment for mirrors and monochromator, enabling rapid wavelength changes for MAD experiments.

    • Main Results:

    • Achieves a spot size of 0.3 x 0.1 mm (FWHM) at the sample position.
    • Delivers beam intensity of approximately 10(11) photons/s on a 0.3 x 0.3 mm area.
    • Provides excellent harmonic rejection (>10(-5)) and high energy resolution (0.5 eV stability/reproducibility).

    Conclusions:

    • The D2AM beamline's stable, high-intensity, and focused X-ray beam is well-suited for demanding crystallographic and materials science applications.
    • Its automated features and rapid wavelength switching capabilities optimize experimental efficiency, particularly for MAD studies.
    • The beamline's performance characteristics make it a valuable resource for researchers in structural biology and condensed matter physics.