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Proceedings Paper

Design and performance of the flexural-hinge-based mirror bender at the SLS protein crystallography beamline X06SA
Author(s): Daniel Rossetti; Ulrich Lienert; Claude Pradervand; Roman Schneider; Ming Shi; Sasa Zelenika; Michel Rossat; Olivier Hignette; Amparo Rommeveaux; Clemens Schulze-Briese
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Paper Abstract

The mirror bender installed at the SLS protein crystallography beamline is designed to be capable of adjusting the vertical phase space of the undulator to the acceptance of protein crystals, i.e. to produce micro-beams as well as essentially parallel beams. The two-moment bender is based on the flexural hinge design pioneered at the ESRF but adapted to high-vacuum by making use of in-vacuum motors and high resolution worm-gears. Special care was taken in the design and fabrication of the clamps and the application of the clamping torque. The Rh-coated fused silica substrate (Zeiss) has a free length of 400 mm and a thickness of 30 mm. Metrology tests at ESRF indicate the high quality of the mirror and the bender. Over the useful length of 350 mm the meridional slope error was found to be 0.17-0.3 μrad (rms) prior to, and less than 0.5 μrad after clamping to the bender. In practice this allows the full central cone of an in-vacuum undulator to be focussed to 7 μm at an image distance of 7.1 m and to 2.1 μm at 1.75 m, corresponding to effective slope errors of less than 0.25 μrad. The bending is very reproducible and is well described by an interaction matrix. Finally, the long range tails were measured in the context of the generation of fs-pulses by means of bunch slicing. Their level cannot be attributed to the surface roughness of 2.9 Å (rms) but rather to scattering from other beamline components such as Be-windows.

Paper Details

Date Published: 24 December 2002
PDF: 8 pages
Proc. SPIE 4782, X-Ray Mirrors, Crystals, and Multilayers II, (24 December 2002); doi: 10.1117/12.453695
Show Author Affiliations
Daniel Rossetti, Paul Scherrer Institute (Switzerland)
Ulrich Lienert, Argonne National Lab. (United States)
Claude Pradervand, Paul Scherrer Institute (Switzerland)
Roman Schneider, Paul Scherrer Institute (Switzerland)
Ming Shi, Paul Scherrer Institute (Switzerland)
Sasa Zelenika, Paul Scherrer Institute (Switzerland)
Michel Rossat, European Synchrotron Radiation Facility (France)
Olivier Hignette, European Synchrotron Radiation Facility (France)
Amparo Rommeveaux, European Synchrotron Radiation Facility (France)
Clemens Schulze-Briese, Argonne National Lab. (United States)

Published in SPIE Proceedings Vol. 4782:
X-Ray Mirrors, Crystals, and Multilayers II
Andreas K. Freund; Albert T. Macrander; Tetsuya Ishikawa; James L. Wood, Editor(s)

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