A compact superconducting ring as a radiation source for X-ray crystallography

Abstract

A compact superconducting storage ring installed at Ritsumeikan University is operated at an electron-beam energy of 0.575 GeV and an initial beam current of 300 mA. The radius of the circular electron orbit is as small as 0.5 m, suggesting that the radiation emitted contains short-wavelength components. With an imaging plate as a detector, X-ray precession diffraction patterns were recorded for organic single crystals within a reasonable period of time using radiation of wavelength 0.155 nm (8 keV) to 0.248 nm (5 keV). The use of the radiation in the structural study of organic crystals containing 3d metal atoms using the phenomena of anomalous scattering is described. If appropriately planned, Xray diffraction and/or scattering experiments can be made at the compact ring without recourse to a large-scale ring.

Phase determination by wavelength-modulated diffraction. I. Centrosymmetric case

“…Owing to its wide continuous spectrum range, synchrotron radiation is most suited to WMD. At Ritsumeikan University a compact superconducting electron storage ring has been installed and, although the electron beam energy is not high (0.575 GeV), the radiation emitted from the ring of small radius (0.5 m) contains X-ray components that are usable for diffraction measurements (Iwasaki, Kurosawa et al, 1998). At the beamline for X-ray diffraction, BL-1, a double-crystal monochromator of the Golovchenko-type (Golovchenko et al, 1981) has been installed, which can provide a monochromatic radiation beam whose position is kept ®xed even when the wavelength is continually changed.…”

Compact Superconducting Ring at Ritsumeikan University

“…It has been shown that radiation in the energy range 5±8 keV is useful for measurement of the intensities of Bragg re¯ections and is particularly suitable for structural studies involving anomalous-scattering phenomena with crystals containing 3d metal atoms (Iwasaki et al, 1998).…”