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[en] The Specification and the layout of the synchrotron of SPring-8 were decided. The synchrotron is designed to accelerate electron or positron beams from 1 GeV to 8 GeV with the repetition cycle of 1 Hz. The injection method of the 1-GeV beam from the linac is adopted to be single-turn technique with on-axis into the synchrotron. The input power of 250 kW into the cavity was achieved in 1991, and the rise time of less than 100 nsec in kicker was succeeded in 1992. The construction of the synchrotron is started in the fiscal year of 1993, and it will be accomplished in 1997
[en] Design of a positron accumulation ring (PAR) for the SPring-8 project has been considered as an option to increase the injection rate into the storage ring via a synchrotron. The beam energy and the circumference of the PAR are 500 MeV and 28.294 m, respectively. The injection rate can be increased by about 10 times. Reduced bunch length in the PAR and RF synchronism between the PAR and the synchrotron are favorable to produce a pure single bunched beam in the storage ring
[en] A micro-focused X-ray beam with size ranging from 1 × 1 to 10 × 10 μm has been achieved at beamline BL32XU at SPring-8, Japan. Combining the available micro-beam with newly developed techniques has enabled efficient protein micro-crystallography.
[en] The SPring-8 has Linac synchrotron, incidence type facility and an accumulation ring. By preparing a beam line to take out light at the accumulation ring, the SPring-8 is supplied for common applications. Development of science adopting new method to study of properties and organisms by using high brightness source is expected. Construction of the SPring-8 accelerator was finished and adjusting test and commissioning of apparatuses are now in proceeding. At pre-use inspection of the accumulation ring on March, 1997, beam lines for R and D and crystalline structure analysis are applied to the Science and Technology Agency to inspect them simultaneously. And, by activating character of the SPring-8 radiation facility of high brightness and high energy X-ray generator, property study using Moessbauer nuclide to a probe can be conducted. (G.K.)
[en] We have developed a new imaging technique that unifies analyser-based and propagation-based X-ray phase-contrast imaging. A novel theoretical approach, utilising the theory of linear shift-invariant systems, was employed to solve the phase-retrieval problem for the case of large Fresnel/Takagi numbers. In October 2003, we performed some preliminary experiments at BL20B2 at SPring-8 to illustrate this new imaging technique
[en] A novel insertion device called an asymmetric figure-8 undulator is proposed. The electron moves along an asymmetric figure-8 orbit by magnetic fields composed of a normal figure-8 undulator and an additional vertical field. Because cancellation of circularly polarized component is avoided, all harmonics have elliptic polarization. Further calculation shows that when the additional field is small compared to original ones, the 0.5th, 1st and 2nd harmonics are vertically, horizontally and circularly polarized, respectively. Because the power distribution is almost equal to that of a figure-8 undulator, the proposed device has the same advantage that the heat load on optical elements is much lower than that of a conventional linear undulator
[en] Beamline BL44XU at SPring-8 is operated by the Institute for Protein Research of Osaka University. The beamline is designed for X-ray crystallography of large biological macromolecular assemblies. Here we show its detailed performances, results, and the ongoing upgrade plans.
[en] This article presents the work that has been made to get a reliable magnet level surveys of the Spring-8 ring. The hydrostatic level system (HLS) completed with a capacitive sensor of water surface, has been used. If the length is about 20 m and the inner diameter of the water pipe is 10 mm, the decay time is stable within a few minutes after the sensor was set on stage. Thus the portable HLS is convenient for measuring points between the reference level ones
[en] This report summarizes the activities of the SPring-8 Project in 1996. The purpose of the SPring-8 Project is to construct the world's most brilliant synchrotron radiation source in the soft and hard x-ray regions. The construction of the facility started in 1990, and the Project approaches its final stage of construction with the most outstanding progress in 1996 being the successful commissioning of the injector linac and the booster synchrotron. Installation of the linac was completed by the end of 1995 and the power test of the entire system started in January 1996. After the RF aging of the waveguide and accelerator columns for three months, the commissioning of the linac started on August 1 and it succeeded to accelerate electrons up to 1 GeV one week later. As for the booster synchrotron, its installation and precise alignment were completed in September. After the full power test of two months, the synchrotron commissioning started on December 6. Electrons were accelerated up to 8 GeV on December 16. The installation of all magnets in the storage ring was completed and the precise alignment of focusing magnets is under way. The installation of vacuum chambers and RF cavities has already been completed and the evacuation test is going on. The commissioning of the storage ring is scheduled in March, 1997. (M.N.)
[en] The current status and prospective applications of nanofocusing for X-ray free-electron lasers are presented. Total-reflection mirror devices for X-ray free-electron laser focusing are discussed in terms of optical design, mirror-fabrication technology, a wavefront diagnosis method and radiation-damage testing, as a review of the present status of the focusing optics at the SPring-8 angstrom compact free-electron laser (SACLA). Designed beam sizes of 1 µm and 50 nm, and spot sizes almost matching prediction have been achieved and used to explore topics at the forefront of natural science. The feasibility of these devices is determined to be sufficient for long-term and stable operation at SACLA by investigating the radiation-damage threshold and achievable accuracies in the mirror figure and alignment