title: Design and performance of an ultra-high-vacuum-compatible artificial channel-cut monochromator.
abstract: The design and performance of a novel ultra-high-vacuum-compatible artificial channel-cut monochromator that has been commissioned at undulator beamline 8-ID-I at the Advanced Photon Source are presented. Details of the mechanical and optical design, control system implementation and performance of the new device are given. The monochromator was designed to meet the challenging stability and optical requirements of the X-ray photon correlation spectroscopy program hosted at this beamline. In particular, the device incorporates a novel in-vacuum sine-bar drive mechanism for the combined pitch motion of the two crystals and a flexure-based high-stiffness weak-link mechanism for fine-tuning the pitch and roll of the second crystal relative to the first crystal. The monochromator delivers an exceptionally uniform and stable beam and thereby improved brilliance preservation.
authors: Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA. sureshn@aps.anl.gov
authors: Suresh
authors: S
authors: Narayanan
authors: Alec
authors: A
authors: Sandy
authors: Deming
authors: D
authors: Shu
authors: Michael
authors: M
authors: Sprung
authors: Curt
authors: C
authors: Preissner
authors: Joseph
authors: J
authors: Sullivan