^[1]（財）高輝度光科学研究センター　放射光研究所　利用促進部門　JASRI Experimental Facilities Division、^[2]理化学研究所　播磨研究所　Ｘ線干渉光学研究室　Coherent X-ray Optics Laboratory, Harima Institute, RIKEN、^[3]（財）高輝度光科学研究センター　放射光研究所　実験部門　JASRI Experimental Research Division

Abstract: High flux beamline (BL40XU) was designed to use the fundamental undulator radiation as a quasi-monochromatic X-ray beam so that very high X-ray flux can be used in various experiments. For this purpose, the use of the crystal monochromator was eliminated and thus flux more than 100 times higher than that obtained with a crystal monochromator can be used. The X-ray source of BL40XU is a helical undulator and its gap can be varied so that the peak energy is altered from 8 keV to 17 keV. The X-ray is focused horizontally and vertically by two water-cooled mirrors that are made of silicon and coated with rhodium and, then, introduced into the experimental hutch. In the experimental hutch, two types of shutter are located. One is driven by a galvanometer-like motor and opens and closes within 1.5 msec after a trigger pulse. The other is a rotating-aperture type shutter. By synchronizing the two shutters, 6 µsec opening can be achieved. As a detector, a fast CCD camera with an X-ray image intensifier that has a short-decay phosphor will be installed. The framing rate of the fast CCD camera is 290 frames per sec (using with frame size of 640×480 pixels, 10bits) and will achieve up to 5000 frames per sec by reducing the size of the frame. BL40XU was open for public users from April 2000. It will be expected that various experiments that require high X-ray flux, e.g. time-resolved diffraction and scattering experiments, X-ray speckle and X-ray fluorescence trace analyses and so on, will be carried out.

Pages 189 - 193 Download PDF (418.67 KB)

4. 最近の研究から／FROM LATEST RESEARCH

BL02B2における精密構造物性研究
The aims of Accurate Structural Studies at BL02B2

坂田　誠　SAKATA Makoto、高田　昌樹　TAKATA Masaki、西堀　英治　NISHIBORI Eiji

名古屋大学工学研究科　応用物理学専攻　Department of Applied Physics, Nagoya University

Abstract: The design concept of large Debye-Sherrer camera installed at BL02B2 is described. It is intended to contribute to further development of materials science and technology by solving accurate structures of materials with interesting physical, chemical, electronical and/or mechanical properties by using powder specimens only. For the purpose, it is extremely important to collect accurate X-ray diffraction data at various temperatures within a reasonable experimental time. A few results so far obtained are also given.

Pages 194 - 198 Download PDF (516.19 KB)

高分解能軟Ｘ線光電子分光による固体の真のバルク電子状態の解明
High Resolution Soft X-ray Photoemission Spectroscopy of Genuine Bulk Electronic Structures of Correlated Electron Systems : Ce Cases

菅　滋正　SUGA Shigemasa、関山　明　SEKIYAMA Akira

大阪大学大学院　基礎工学研究科　物性物理科学分野　Department of Material Physics, Graduate School of Engineering Science, Osaka University

Abstract: We have constructed a high resolution and high flux soft X-ray beamline BL25SU connected to the twin-helical undulator of SPring-8. Three experimental stations are installed in a tandem configuration. In the first station, an SES200 photoelectron analyzer and a closed cycle He cryostat are installed. Near 1keV, high resolution photoemission with a total resolution better than 100meV is conventionally performed. Bulk electronic states of correlated electron systems are studied with high accuracy. Genuine bulk electronic states of a Kondo system CeRu₂Si₂ and a valence fluctuation system CeRu₂ are clarified for the first time.

Pages 199 - 202 Download PDF (133.32 KB)

リンの液体−液体1次相転移
A First – Order Liquid – Liquid Transition in Phosphorus

片山　芳則　KATAYAMA Yoshinori

日本原子力研究所　関西研究所　放射光科学研究センター　Synchrotron Radiation Research Center, JAERI Kansai Research Establishment

Abstract: We have found an abrupt, pressure-induced structural change between two distinct forms of liquid phosphorus at about 1 GPa by an in-situ X-ray diffraction method. Features of the transformation strongly support the view that it is a first-order liquid-liquid phase transition.

Pages 203 - 207 Download PDF (70.65 KB)

5. 研究会等報告／WORKSHOP AND COMMITTEE REPORT

平成11年度の諮問委員会等の活動状況
Activities of the SPring-8 Advisory Committee and the Others in the 1999 Fiscal Year

放射光利用研究促進機構　（財）高輝度光科学研究センター　企画調査部　Organization for the Promotion of Synchrotron Radiation Research･JASRI Planning Division

Pages 208 - 214 Download PDF (29.24 KB)

平成11年度のビームライン検討委員会の検討状況
Activities of the Public Beamline Committee in the 1999 Fiscal Year

放射光利用研究促進機構　（財）高輝度光科学研究センター　企画調査部　Organization for the Promotion of Synchrotron Radiation Research･JASRI Planning Division

Pages 215 - 217 Download PDF (17.61 KB)

SPring-8国際アドバイザリー会議の開催について
SPring-8 Advisory Council

（財）高輝度光科学研究センター　企画調査部　JASRI Planning Division

Page 218 Download PDF (9.21 KB)

第3回SPring-8利用技術に関するワークショップの報告（その1）
A Brief Report on the 3rd Technical Workshop for SPring-8 Utilization (Part-1)

森山　英明　MORIYAMA Hideaki

（財）高輝度光科学研究センター　放射光研究所　利用促進部門　JASRI Experimental Facilities Division

Abstract: The Third Technical Workshop for SPring-8 Utilization have held Two-day workshop had started with the general greetings and introduction. Those issues regarding the thirty-meter undulator and storage ring operation in 2000B period have also stated. In the 'analytical science' session, major topics were minute fraction and extreme microanalysis with seeking how to beyond the limit(s). Utilization and observed results of experiments with high-temperature and high-pressure cell 'SPEED1500' were presented in the session of 'high pressure earth science. Beam line oriented presentations and discussions were performed regarding extract of the specificity of SPring-8 beam in the 'soft X-ray science,' session. 'Biological science' session had discussions on fundamental techniques how to use the beamline and results of experiments as a base of dynamic point of view. The workshop has closed successfully.

Pages 219 - 220 Download PDF (16.83 KB)

第3回SPring-8利用技術に関するワークショップの報告（その2）
A Brief Report on the 3rd Technical Workshop for SPring-8 Utilization (Part-2)

河合　潤　KAWAI Jun

京都大学大学院　工学研究科　Department of Materials Science and Engineering, Kyoto University

Pages 221 - 222 Download PDF (290.70 KB)