Browsing by Author "Janky, S"

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    The Australian diffractometer at the Photon Factory
    (American Institute of Physics, 1992-01) Barnea, Z; Creagh, GC; Davis, TJ; Garrett, RF; Janky, S; Stevenson, AW; Wilkins, SW
    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.
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    Direct current servo motor controlled four‐jaw slits for synchrotron radiation
    (American Institute of Physics, 1994-07-18) Garrett, RF; Cookson, DJ; Davey, P; Janky, S; Wilkins, SW
    A four‐jaw slit assembly and eight‐axis dc servo motor controller have been constructed and are in use at the Australian National Beamline Facility (ANBF) at the Photon Factory. Because of the vacuum operation of the beamline diffractometer, dc servo motors were preferred to stepper motors. Due to the large number of motors to be controlled, commercial dc servo controllers were unsuitable, and an eight‐axis controller was designed to be used in conjunction with the E500 CAMAC stepper motor controller. The system has been in use at the ANBF for about one year, and has allowed the integration of approximately 30 dc servo and stepper motors into a standard control system. © 1995 American Institute of Physics.