A novel ultra-high-vacuum (UHV)-compatible x-ray monochromator has been designed and commissioned at the undulator beamline 8-ID-I at the Advanced Photon Source (APS) for x-ray photon correlation spectroscopy applications. To meet the challenging stability and x-ray optical requirements, the monochromator integrates two new precision angular positioning mechanisms into its crystal optics motion control system: An overconstrained weak-link mechanism that enables the positioning of an assembly of two crystals to achieve the same performance as a single channel-cut crystal, the so called "artificial channel-cut crystal"; A ceramic motor driven in-vacuum sine-bar mechanism for the double crystal combined pitch motion. The mechanical design of the monochromator, as well as the test results of its positioning performance are presented in this paper.

Date Published: 17 September 2007
PDF: 8 pages
Proc. SPIE 6665, New Developments in Optomechanics, 66650O (17 September 2007); doi: 10.1117/12.733101

Published in SPIE Proceedings Vol. 6665:
New Developments in Optomechanics
Alson E. Hatheway, Editor(s)