ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
The station is intended for x-ray analysis of single crystals, primarily that of proteins with the beam of synchrotron radiation from the superconducting wiggler of a special storage ring E=2.0 GeV, I=0.3 A in the town of Zelenograd (TNK).1 The dimensions of the radiation source are 2.352 σx⋅σz=1.5×0.05 mm2, the brightness for λ=1.5 A(ring) is 1015 photon/(s mm2 mrad.2 0.1% (Δλ/λ)). The station comprises the device forming the monochromatized primary beam (λ=0.5–2.2 A(ring), Δλ/λ−3∼10−4) that consists of an asymmetric focusing monochromator with triangular-shaped Si or Ge crystal curved as a round cylinder,2 a segmented mirror of total external reflection placed behind the monochromator on a rotating bench consisting of 8 flat glass 200×50×25 mm2 segments that form a surface imitating an elliptical cylinder, three pairs of horizontal and vertical slits, monitor–ionization chamber, four-circle diffractometer with scintillation counter and horizontal main axis placed on the adjustable carriage that can turn about the monochromator axis; position-sensitive proportional chamber with spherical drift space, 512×512 elements of space resolution and time resolution of 106 photons per second that can be vertically shifted and bent around the holder horizontal axis. The monochromator goniometer as well as the crystal bend and the mirror segments are driven by the multiple-turn potientiometers by the computer and CAMAC interface.The automatic four-circle goniometer device is controlled by stepping drives, the angles being controlled by means of 16 register absolute optoelectronic detectors and the same computer. The data from the position-sensitive detector are read through the increment channel to annex memory of 256 K word (16 registered) capacity in the CAMAC block and then to the computer to be followed by visualization on the coloured display. All the station units are to be manufactured in 1991. The working out and manufacturing of the instrumentation is being fulfilled by the Institute of Crystallography of the USSR Academy of Sciences, the Department of nonfilm chambers of the High Energy Laboratory of the Joint Institute for Nuclear Research (Dubna) and the Special Design Bureau at the Institute of Crystallography.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1143190
