Optical design for the NSLS crystallography beam line
Abstract
A photon beam well suited to accurate single crystal diffraction measurements, with particular attention to the possibilities of the use of anomalous dispersion is addressed. A beam uniform in intensity to 1% over an area 0.3 x 0.3 square mm, delta E/E is aproximately .0005, and tunable over the energy range 5 to 21 keV accessible from a NSLS bending magnet were determined. These criteria lead to a number of design decisions. A mirror is placed as the first optical element to better match the vertical opening angle of the photon beam to the typical rocking curves of low index silicon Bragg peaks, reducing delta E/E in a nondispersive, two crystal paralled mode monochromator with constant deviation. A post mirror to condense the radiation is placed after the monochromator. The entire optical system has been designed to operate in an ultra high vacuum environment.
- Publication:
-
Presented at Intern. Conf. on X-ray and VUV Synchrotron Radiation Instrumentation
- Pub Date:
- 1982
- Bibcode:
- 1982xusr.confQ...9H
- Keywords:
-
- Crystallography;
- Density Distribution;
- Diffraction;
- Optical Equipment;
- Photon Beams;
- Single Crystals;
- Structural Design;
- Bragg Curve;
- Charge Distribution;
- Grazing Incidence;
- Magnetic Mirrors;
- Monochromators;
- Ray Tracing;
- Synchrotrons;
- Ultrahigh Vacuum;
- Solid-State Physics