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24 citations found for Tamasaku,

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Circularly polarized X-rays were produced between 0.14 and 0.16 nm using a perfect-crystal phase retarder in Bragg geometry. Linear polarization of the on-axis synchrotron radiation was converted to circular polarization of the two helicities with degree of circular polarization higher than 0.98.

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A new method using intensity correlation of X-ray fluorescence is proposed and demonstrated for temporal diagnostics of femtosecond and attosecond X-ray free-electron laser pulses.

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A new optical technique used to extract a specific harmonic of undulator radiation is proposed and the concept was experimentally confirmed using X-ray pulses from SACLA.

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Acta Cryst. (2002). A58, c212
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The rotated-inclined double-crystal monochromator (RIDCM) has been adopted to reduce the heat load from third-generation undulator radiation. The position of the exit X-rays from RIDCM has been calculated as a function of X-ray energy on the basis of diffraction theory including refraction effects. The results show that the positions of the exit X-rays vary over a wide range due to asymmetric reflection. Methods of fixing the exit position in RIDCM are also discussed.

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Absolute X-ray energy measurement based on a Bond diffractometer is demonstrated. This diffractometer uses a reference silicon single-crystal plate and a highly accurate angle encoder to measure the Bragg angle accurately.

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The SPring-8 beamline control system is now taking part in the control of the insertion device (ID), front end, beam transportation channel and all interlock systems of the beamline: it will supply a highly standardized environment of apparatus control for collaborative researchers. In particular, ID operation is very important in a third-generation synchrotron light source facility. It is also very important to consider the security system because the ID is part of the storage ring and is therefore governed by the synchrotron ring control system. The progress of computer networking systems and the technology of security control require the development of a highly flexible control system. An interlock system that is independent of the control system has increased the reliability. For the beamline control system the so-called standard model concept has been adopted. VME-bus (VME) is used as the front-end control system and a UNIX workstation as the operator console. CPU boards of the VME-bus are RISC processor-based board computers operated by a LynxOS-based HP-RT real-time operating system. The workstation and the VME are linked to each other by a network, and form the distributed system. The HP 9000/700 series with HP-UX and the HP 9000/743rt series with HP-RT are used. All the controllable apparatus may be operated from any workstation.

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A single-shot CCD-based data acquisition system for time-resolved photoelectron spectroscopy using an X-ray free-electron laser has been developed. The basic performance of the system is demonstrated using XFEL-induced and synchrotron-radiation-induced Ti 1s core-level spectroscopy.

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The surface profile of an Si flat substrate was retrieved from multiple total reflection images taken at various distances with coherent X-rays.

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An X-ray BBB interferometer has shown intensity oscillations when its front mirror was displaced by a piezoelectric disc translator. These were caused by the change in the length of the front path while that of the back path stayed constant.

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Bragg backscattering of 10 keV X-rays from large commercial quartz crystals has shown low defect concentrations and experimental energy widths of 4.0 meV. Quartz thus appears to be a useful X-ray optical material, particularly for meV-resolution energy analyzers of X-rays with energy 12 keV or less.

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Sub-microradian beam divergence was achieved by the newly installed mirror system in SPring-8/BL29XUL.


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Spatial coherence is estimated quantitatively from the equal-thickness fringes by correcting the effect of the dynamical absorption.

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A phase problem and spectrum recovery from the modulus of an interferogram are discussed.

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Lateral shift of the Bragg diffracted beam was measured for a spectrally narrow beam.

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