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Asymmetric-cut variable-incident-angle monochromator.

R K Smither1, T J Graber, P B Fernandez

  • 1Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA. rks@aps.anl.gov

The Review of Scientific Instruments
|April 3, 2012
PubMed
Summary
This summary is machine-generated.

A novel monochromator using asymmetric-cut crystals was developed for high heat load synchrotron applications. This versatile instrument enables various experimental setups and beam manipulations for advanced X-ray research.

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Area of Science:

  • Synchrotron radiation instrumentation
  • X-ray optics and diffraction

Background:

  • High heat load monochromators are crucial for intense synchrotron sources.
  • Previous designs faced limitations in versatility and beam control.

Purpose of the Study:

  • To develop and test a novel asymmetric-cut variable-incident-angle monochromator.
  • To assess its capabilities for high heat load and versatile experimental applications.

Main Methods:

  • Construction of a monochromator with two 18° asymmetrically cut Si crystals.
  • Utilized three independent rotation axes (Φ, Ψ, Θ) for precise beam manipulation.
  • Incorporated liquid metal cooling for the first crystal to manage heat load.

Main Results:

  • The monochromator effectively handled high heat load (5-10 kW) synchrotron beams.
  • Demonstrated versatility for various experimental configurations and beam shaping.
  • Achieved significant vertical beam expansion (10-15x) in doubly expanding mode.
  • Generated a uniform 8 keV area beam (16x26 mm) suitable for imaging.

Conclusions:

  • The asymmetric-cut monochromator offers high heat load capability and exceptional experimental versatility.
  • Variable-incident-angle design allows for control over acceptance angle and bandwidth.
  • Enables advanced X-ray applications, including high-resolution imaging.