Compact Superconducting Ring at Ritsumeikan University

Abstract

A compact superconducting storage ring (0.575 GeV and 300 mA) with a racetrack microtron injection system was installed at Ritsumeikan University and has been operated successfully since April 1996. As the radius of the circular electron orbit is small (0.5 m), it is possible to use a radiation beam of relatively high photon¯ux at a short distance from the source point. Beamlines have been constructed including those for XAFS, soft X-ray spectroscopy, VUV spectroscopy,¯uorescent X-ray analysis, soft X-ray microscopy, X-ray diffraction/scattering and photoelectron spectroscopy; the photoelectron spectrometer is combined with an ion-beam-scattering spectrometer to obtain information both on the electronic states and on the atomic arrangements of a solid surface. In addition there are two beamlines, one for LIGA exposure and the other for synchrotron radiation ablation, which are devoted to producing new devices and materials. The synchrotron radiation facility is open not only to users in the University but also to researchers in industry, governmental institutions and other universities.

Design of an apparatus for polarization measurement in soft X-ray region

“…A preliminary test of the soft X-ray polarimeter and ellipsometer (SXPE) was carried out at BL-11 of AURORA, a superconducting compact storage ring [16], at the SR Center of Ritsumeikan University, Shiga, Japan. BL-11 is an evaluation beamline for soft X-ray optical elements by means of a modified θ-2θ reflectometer/diffractometer (MRD) [17].…”

New type of Monk-Gillieson monochromator capable of covering a 0.7- to 25-nm range

“…The advent of advanced soft x-ray sources including third generation synchrotron radiation, x-ray lasers, and high power x-ray plasma sources, and the increasing demands for their critical application in science and industry have encouraged innovation in diffraction grating monochromators to operate in an energy range over 1 keV because the crystal monochromators suffer from undesirable constituent element absorption edges, and low durability against heat load especially in the 12keV 13 The advantages of grating monochromators are that they are not only free from undesirable constituent element absorption edges and have durability against heat load by using a substrate having high thermal conductivity and a low coefficient of expansion4 but also have the possibility to improve diffraction efficiency with conical diffraction mountings.5" Conical diffraction mountings are very attractive because of overcoming the shadowing effect12 which reduces diffraction efficiency of grazing incidence mountings. However most of the conical diffraction (or extreme off-plane) mountings require complex auxiliary optics canceling out the advantage of high diffraction-efficiency as well as exotic wavelength scanning mechanisms.…”

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

“…C of the UVSOR ring (0.75 GeV) is 2.92 nm. After making a minor modi®cation to the original design, AURORA was installed at Ritsumeikan University in April 1996 and has been operated successfully since then (Iwasaki, 1997;Iwasaki et al, 1998). The small radius of the electron orbit allows the optical components of the beamline to be placed at a distance close to the source point so that it is possible to use a radiation beam with a relatively high photon¯ux.…”