Research and Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI/SPring-8)/CREST^* Department of Physical Science, Hiroshima University/CREST^** The Graduate School of Pure and Applied Sciences, Tsukuba University/CREST^*** RIKEN/CREST^**** Graduate School of Material Science, University of Hyogo/CREST^***** RIKEN (JASRI/SPring-8)/CREST^******
○Haruno Murayama^* Nobuhiro Yasuda^* Jungeun Kim^* Yoshimitsu Fukuyama^* Shigeru Kimura^* Yoshihiro Kuroiwa^** Kenichi Kato^* Yutaka Moritomo^*** Yoshihito Tanaka^**** Koshiro Toriumi^***** Masaki Takata^******

The study of dynamic structures is important to characterize nano-materials and their events such as amorphous-crystal change on recording DVD media and photo-induced metal-insulator transition. For these researches, we are developing X-ray pinpoint structural measurement technique, which is XRD measurement system in ～100 nm spatial resolution and ～40 ps time resolution with focusing X-ray by a zone plate.
High brilliant pulse X-ray emanating from insertion device of the SPring-8 is powerful tool for a time resolved measurement using single pulse X-ray. The pinpoint X-ray structural measurement system has been constructed on the high flux beam line using a helical undulator, BL40XU at the SPring-8. About 100nm focused beam can be produced by a high resolution type standard Fresnel zone plate,ZP2, whose Ta thickness is 0.75 μm. For 8 keV X-rays, the ideal X-ray diffraction efficiency is 12 %. To increase X-ray diffraction efficiency, a high flux type, ZP1, whose Ta thickness is 2.5 μm, was designed. The ZP1 achieved the diffraction efficiency up to 20 %. The beam size and flux per unit area of 15 keV X-ray was 1.4x2.4 μm² and 3x10¹⁴ photons･s^-1･mm^-2, respectively. In order to align micro-beam with sub-micron size crystal, high precision two circle goniomator, whose decentering error is within ±100 nm/360°were constructed with CCD or IP detector. A femto/picosecond pulse laser (Ti:sapphire oscillator, λ=800nm) system is equipped on the diffractomator for a photo-irradiation pump and probe experiment using X-ray pulse selector. The details of the instruments and performance of the X-ray pinpoint structural measurement system will be presented.