Year: 2002
Type: conference-abstract
Abstract: A new bending magnet beamline has been built at the Advanced Light Source that produces a focused beam of monochromatic x-rays suitable for the study of very small (10µm x 20µm x 20µm) crystals.A channel-cut Si<111> monochromator is used with a special cooling system that cools the diffraction surface to around 120° K where the expansion coefficient is close to zero.Following the monochromator is a toroidal silicon mirror that collects 3 mrad horizontally and produces a 1:1 focus of the x-ray source 14 meter downstream.The beam size at the sample position is 280 µm wide by 70 µm high with a flux above 2 x 10 11 photons per second at 12 keV.A vertically mounted goniometer with a fixed offset of 54.7° is used to rotate the crystal.A large area (300 mm diameter) optically-coupled detector (Proteum 300) is mounted on a scanning arm that allows the detector to swing up to 45° for high-resolution studies.For most crystals the detector is set at zero degree and only the sample is scanned.Examples of the range of crystals that can be studied with this system will be given and prospects for future performance improvements will be presented.
Authors: T. Eriksson, H.-J. Chiu, K. Sharp, T. McPhillips, S. McPhillips, N. Sauter, M. Soltis, P. Kuhn
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2015609846