The Australian diffractometer at the Photon Factory
No Thumbnail Available
Date
1992-01
Journal Title
Journal ISSN
Volume Title
Publisher
American Institute of Physics
Abstract
Outlined are design features of a versatile high‐resolution two‐axis diffractometer that is being constructed for operation at the Photon Factory as an Australian national facility. The instrument features optional use of multiple‐imaging plates on a translating cassette to allow rapid recording of an almost complete range of data covering both the high‐angle and small‐angle scattering regime or alternatively the use of electronic detectors. The instrument will be capable of operation in various modes including the following: (i) high‐resolution powder diffraction with single‐channel counter and crystal analyzer, (ii) high‐resolution, high‐speed powder diffraction in the Debye–Scherrer mode with imaging plates as recording medium, either stationary or translating (for time‐dependent studies), (iii) small‐angle x‐ray scattering with imaging plates as recording medium, (iv) protein crystallography in screenless Weissenberg mode, and (v) two‐ or three‐axis single‐crystal diffractometry. The salient features of the instrument are the use of a double‐crystal sagittal focusing monochromator as primary monochromator together with the optional use of a condensing–collimating channel‐cut (CCCC) monochromator or other channel‐cut monochromator as secondary monochromator. The use of a CCCC monochromator enables fine tuning of beam position on sample, harmonic suppression, beam‐condensation, and variation of wavelength bandpass. Further features include the use of high‐precision incremental encoders on both axes, together with the capability of operating the whole diffractometer, including secondary monochromator and detectors, in vacuum of order 10−3 Torr in order to reduce absorption and parasitic scattering, and the use of a large camera radius (approximately 0.57 m) for the imaging plate cassette in order to increase angular resolution and signal to noise. © 1992 American Institute of Physics.
Description
Physical copy held at DDC: 539.735/19. Also accessible at: https://doi.org/10.1063/1.1143202
Keywords
Australian organizations, Diffractometers, Measuring instruments, Monochromators, Debye-Scherrer method, Crystals, Weierstrass Functions, Scattering
Citation
Barnea, Z., Creagh, D. C., Davis, T. J., Garrett, R. F., Janky, S., Stevenson, A. W., & Wilkins, S. W. (1992). The Australian diffractometer at the Photon Factory. Paper presented to the 4th International Conference on Synchrotron Radiation Instrumentation, 15-19 July 1991, Chester, United Kingdom. Proceedings of the 4th International Conference on Synchrotron Radiation Instrumentation, 15-19 July 1991, Chester, United Kingdom, (pp. 1069-1072).