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Journal Articles

Calculations for the availability of photoneutron using synchrotron radiation

Asano, Yoshihiro; Kawashima, Yoshitaka*

Radiation Protection Dosimetry, 115(1-4), p.176 - 180, 2005/12

 Times Cited Count:0 Percentile:100(Environmental Sciences)

no abstracts in English

JAEA Reports

Stabilizing methods against mechanical vibrations of vacuum exhaustion units on BL11XU at SPring-8

Kiriyama, Koji*; Shiwaku, Hideaki

JAERI-Tech 2005-044, 16 Pages, 2005/08

JAERI-Tech-2005-044.pdf:1.31MB

Stabilizing methods for vacuum exhaustion units in the optics section of the beamline have been developed on BL11XU at SPring-8. In this study, we especially focus on the vibrations from scroll pumps in the vacuum exhaustion units. Vibration frequencies are measured directly on the scroll pump under multiple conditions. The results showed that countermeasures to restrain the 30Hz vibration from scroll pumps on the beamline which was caused by working scroll pump are (1) using a damper for scroll pump, (2) pulling out the scroll pump from a vacuum unit support, and (3) settling flexible tubes and the scroll pump on the floor. These methods successfully removed the mechanical vibrations of the scroll pumps. As a result, the amplitude of 30Hz vibration on the monochromator crystals was decreased from 3.3$$times$$10-5mm to 6.2$$times$$10-6mm. The developed method in the present study on BL11XU is expected to apply to the similar vacuum units at the other beamlines.

JAEA Reports

Study of beam fluctuation of high speed variably-polarizing undulator APPLE-2 in 2001 Dec.-2002 Nov.

Nakatani, Takeshi; Agui, Akane; Yoshigoe, Akitaka; Tanaka, Hitoshi*; Takao, Masaru*; Takeuchi, Masao*; Matsushita, Tomohiro*; Aoyagi, Hideki*

JAERI-Tech 2005-027, 29 Pages, 2005/05

JAERI-Tech-2005-027.pdf:5.14MB

We measured the orbit fluctuation caused by APPLE-2 type undulator (ID23) installed in the SPring-8 storage ring by using the developed real time measurement system of electron and photon beam position monitors. We quantitatively found two characteristic fluctuations correlating with the ID23 motion by wavelet transform which is a kind of frequency analysis. One originates from the variation of error field during the ID drive. The other originates from the stray magnetic field leaked from the servomotors for the phase drive. Using these results, we tried to get rid of the effect of error fields on the beam orbit by the precise feed-forward correction table and the stray field shield. Consequently we succeeded in suppressing the orbit fluctuation down to sub-micron during the gap drive, which is observed by photon beam position monitors installed in downstream 20m from each light source point.

JAEA Reports

Stabilizing methods for mechanical vibrations on cryogenically cooled monochromator on BL11XU at SPring-8

Kiriyama, Koji*; Shiwaku, Hideaki; Mochizuki, Tetsuro*; Shobu, Takahisa*; Tozawa, Kazukiyo*

JAERI-Tech 2005-003, 36 Pages, 2005/03

JAERI-Tech-2005-003.pdf:4.19MB

Multi-stabilizing methods for vibrations on the cryogenically cooled monochromator have been tried on BL11XU at SPring-8. Observed vibrations on crystals were mainly 1-10 Hz, 30 Hz, and 50 Hz. The results suggested that sources of the vibrations were liquid nitrogen flow and propagation from vibrations of vacuum pumps equipped with beam line. We took countermeasures of the vibrations to liquid nitrogen tubes, and set parameters (temperature, pressure and flow-late) of the cryogenic cooling system for 1-10 Hz vibration. Vibration absorber was set not to propagate the vibrations from the vacuum pumps and their fans for 30 and 50 Hz vibrations. These methods successfully removed the mechanical vibrations. Then, intensity vibration of X-ray was decreased from 4.47 % to 0.85 %, in the end. The stabilizing methods on BL11XU are expected to apply to the similar system at the other beam-lines.

JAEA Reports

Annual report of Kansai Research Establishment 2003; April 1, 2003 - March 31, 2004

Kansai Research Establishment

JAERI-Review 2004-030, 150 Pages, 2005/02

JAERI-Review-2004-030.pdf:11.32MB

This report is the fifth issue of the annual report of Kansai Research Establishment, Japan Atomic Energy Research Institute. It covers status reports of R&D and results of experiments conducted at the Advanced Photon Research Center and the Synchrotron Radiation Research Center during the period from April 1, 2003 to March 31, 2004.

Journal Articles

3rd International Workshop on Radiation Safety of Synchrotron Radiation Sources (Radsynch '04)

Asano, Yoshihiro

SPring-8 Information, 10(1), p.35 - 38, 2005/01

no abstracts in English

Journal Articles

First observation of natural circular dichroism for biomolecules in soft X-ray region studied with a polarizing undulator

Tanaka, Masahito*; Nakagawa, Kazumichi*; Agui, Akane; Fujii, Kentaro; Yokoya, Akinari

Physica Scripta, T115, p.873 - 876, 2005/00

no abstracts in English

JAEA Reports

Measurement of orbit fluctuation caused by APPLE-2 undulator phase motion and the correction table depending on its phase position

Nakatani, Takeshi; Agui, Akane; Yoshigoe, Akitaka; Matsushita, Tomohiro*; Takao, Masaru*; Takeuchi, Masao*; Aoyagi, Hideki*; Tanaka, Hitoshi*

JAERI-Tech 2004-013, 16 Pages, 2004/12

JAERI-Tech-2004-013.pdf:3.55MB

We observed two characteristic electron orbit fluctuations caused when the phase of ID23 (APPLE-2 type undulator) installed at SPring-8 was driven. One was caused by the variation of magnetic error filed of ID23 when the phase was driven. The other was caused by the noise from the phase drive system which adoped AC servomotors. We measured these orbit fluctuations synchronized with the phase motion using the real-time electron beam position measurement system. The part of the orbit fluctuation was supressed by the correction table which was made referring to the obtained data.

Journal Articles

Real-time monitoring of oxidation processes on the Si(001) surface using O$$_{2}$$ gas under 1000 K by synchrotron radiation photoemission spectroscopy

Yoshigoe, Akitaka; Moritani, Kosuke; Teraoka, Yuden

Surface Science, 566-568(Part.2), p.1124 - 1129, 2004/09

 Times Cited Count:5 Percentile:68.86(Chemistry, Physical)

The Si(001) oxidaion is an important reaction for not only semiconductor technology but also surface science. It is known that the growth mode forming oxide-layers is divided into two regions depending on surface temperature conditions. One is passive oxidation and the other is two dimensional island growth including SiO desorption. Since the oxygen uptake measurements have been measured in many reported studies, Si oxidatuion states related to the growth of oxide-layers have not been clarified yet. In order to measure the time evolution of Si oxidation states depending on the surface temperature, we have performed the real-time photoemission measurements using synchrotron radiation at SUREAC2000 in SPring-8 . We found that the Si$$^{4+}$$ states was formed at the early oxidation stage in the two dimiensional island regions.

Journal Articles

Production mechanism of DNA bases radical induced by inner-shell excitation

Yokoya, Akinari

Hoshako, 17(3), p.111 - 117, 2004/05

To reveal the mechanism of oxidative base damages, such as 8-oxo-G, in DNA molecule by ionizing radiation, DNA base radicals were examined around oxygen and nitrogen K-edge region using an EPR spectrometer installed in a synchrotron soft X-ray beamline (BL23SU) in SPring-8. In situ measurements of EPR spectrum of guanine base revealed that short-lived transient radical species are specifically induced by photoexcitation of a 1s electron to $$sigma$$* antibonding orbital at carbonyl oxygen atom. They promptly disappear by "beam-off". On the other hand, a long-lived radical whose EPR spectrum is consistent with previous reports for guanine cation radical was accumulated during the irradiation. The yield of the stable radical decreased by These results indicate that chemically stable DNA base lesions, such as 8-oxo-G, would result from transient species that are inferred to be one electron oxidized radicals after decay of Auger final state.

Journal Articles

Absolute measurement of extremely high intense photons using calorimetric method

Asano, Yoshihiro; Kishi, Noriyuki*; Moriya, Takahiro*; Miura, Yuta*; Inoue, Katsuaki*

AIP Conference Proceedings 705, p.568 - 571, 2004/04

no abstracts in English

JAEA Reports

Characterization of cryogenically cooled silicon crystals, for the double-crystal monochromator on BL11XU at SPring-8

Tozawa, Kazukiyo*; Kiriyama, Koji*; Mitsui, Takaya; Shiwaku, Hideaki; Harami, Taikan

JAERI-Tech 2004-041, 27 Pages, 2004/03

JAERI-Tech-2004-041.pdf:5.11MB

Liquid-N$$_{2}$$-cooled Si crystals replaced water-cooled diamond crystals for the double-crystal monochromator on BL11XU at SPring-8. To use the whole energy from 6 keV to 70 keV, we developed the system of dual symmetric Si geometry, Si(111)/Si(311), which can be switched by a horizontal translation (X) stage perpendicular to the beam axis. The off-line experiment was performed to estimate the degree of the crystal strain, which may arise from the way of assembling in the crystal holder. With MoK$$alpha$$$$_{1}$$, rocking curves from the crystals were measured for the second crystal of the double-crystal diffractometer of parallel setting. Each of the observed full-width at half maximum (FWHM) was almost constant and identical to the calculated value wherever X-rays hit on the crystal surface. By the use of synchrotron radiation from the undulator the crystals were tested and then the characterization was performed. The observed intensities and rocking curves resulted in that each crystal was good for BL11XU and that the performance of X-ray reflection was improved.

JAEA Reports

Setup of the X-ray mirror system on BL11XU at SPring-8

Kiriyama, Koji*; Takahashi, Masamitsu; Shiwaku, Hideaki

JAERI-Tech 2004-017, 39 Pages, 2004/03

JAERI-Tech-2004-017.pdf:2.49MB

X-ray mirror system has been installed on a JAERI beam-line, BL11XU, at SPring-8. This system has improved the quality of the reflected X-ray from the monochromator by focusing and removing of higher-order reflections. Here we presented test results of the X-ray mirror system. Reflectivity and FWHM of focusing X-ray by the mirror system are 3 times as strong as and 1/3 as narrow as unfocusing X-ray, respectively. Removal of higher-order reflections was also checked. These results showed that the mirror system on BL1XU was satisfied good performance for experimental use. And we completed a fully systematic instruction manual for operation of the X-ray mirror system on BL11XU quickly and easily. The instruction manual prevents trivial mistakes in operation of the X-ray mirror system on BL11XU and is expected to assist every mirror users on BL11XU in their works.

JAEA Reports

Annual report of Kansai Research Establishment 2002; April 1, 2002 - March 31, 2003

Kansai Research Establishment

JAERI-Review 2003-042, 140 Pages, 2004/02

JAERI-Review-2003-042.pdf:11.75MB

This report is the fourth issue of the annual report of Kansai Research Establishment, Japan Atomic Energy Research Institute. It covers status reports of R&D and results of experiments conducted at the Advanced Photon Research Center and the Synchrotron Radiation Research Center during the period from April 1, 2002 to March 31, 2003.

Journal Articles

Cryogenically cooled monochromator with multi-crystal switching system on BL11XU at SPring-8

Shiwaku, Hideaki; Mitsui, Takaya; Tozawa, Kazukiyo*; Kiriyama, Koji*; Harami, Taikan; Mochizuki, Tetsuro*

AIP Conference Proceedings 705, p.659 - 662, 2004/00

We developed a multi-crystal switching system on a cryogenically cooled monochromator of JAERI materials science beamline, BL11XU. In order to study our science, it is necessary for ensuring at least the energy range of 6 - 70keV to employ Si(111) and Si(311) crystals. The principle of the crystal switching is that, two pair of crystals is arranged side by side, and they are translated in horizontal direction for exchanging. Indium sheets were inserted between both sides of crystals in order to improve thermal contact. Some adjustment stages of the monochromator were removed to avoid the crystal vibration and a sheet heater was installed on an X-axis stage to prevent over-cooling of X-axis stages. The monochromator is under commissioning at present. In comparison with a previous indirect water cooling diamond (111) crystal monochromator, this monochromator provides high flux intensity from 4 times to 7 times. It takes only 5 minutes to exchange and adjust crystals geometry. This mechanism will be easily applied to other crystals, for example asymmetrical-cut crystals.

Journal Articles

Characterization of cryogenically cooled dual symmetric silicon geometry, Si(111)/Si(311), for the double-crystal monochromator on BL11XU at SPring-8

Tozawa, Kazukiyo*; Kiriyama, Koji*; Mitsui, Takaya; Shiwaku, Hideaki; Harami, Taikan

AIP Conference Proceedings 705, p.671 - 674, 2004/00

Liquid-N$$_{2}$$-cooled Si crystals replaced water-cooled diamond crystals for the double-crystal monochromator on BL11XU at SPring-8. To use the whole energy from 6keV to 70keV, we adopted the system of alternative dual symmetric Si geometry, Si(111)/Si(311), which can be switched by a horizontal translation (X) stage perpendicular to the beam axis. Before the experiment on BL11XU, the off-line evaluation was performed to estimate the degree of the crystal strain, which may arise from the way of assembling. With MoK$$alpha$$$$_{1}$$, rocking curves from the crystals were measured for the second crystal of the double-crystal diffractometer of parallel setting. Each of the observed FWHM was almost constant and identical to the calculated value wherever X-rays hit on the crystal surface. By the use of synchrotron radiation from the undulator the crystals were tested and then the characterization was performed. The observed intensities and rocking curves resulted in that each crystal was good for BL11XU and that the performance of X-ray reflection was improved.

Journal Articles

Measurement of absolute intensity for high energy SR photons using calorimeter

Asano, Yoshihiro; Kishi, Noriyuki*; Moriya, Takahiro*

AIP Conference Proceedings 705, p.564 - 567, 2004/00

no abstracts in English

JAEA Reports

Four-blade-drive style X-ray beam position monitor for soft X-ray beamline BL23SU at SPring-8

Agui, Akane; Aoyagi, Hideki*; Yoshigoe, Akitaka; Nakatani, Takeshi

JAERI-Tech 2003-089, 23 Pages, 2003/12

JAERI-Tech-2003-089.pdf:1.33MB

no abstracts in English

Journal Articles

Sagittal focusing bender for SPring-8 bending magnet beamlines

Yoneda, Yasuhiro; Matsumoto, Norimasa; Furukawa, Yukito*; Ishikawa, Tetsuya*

SPring-8 Riyosha Joho, 8(6), p.397 - 400, 2003/11

no abstracts in English

JAEA Reports

Setup of the cryogenic cooling system on BL11XU at SPring-8

Kiriyama, Koji*; Shiwaku, Hideaki; Tozawa, Kazukiyo*

JAERI-Tech 2003-061, 21 Pages, 2003/07

JAERI-Tech-2003-061.pdf:3.25MB

Cryogenically cooled monochromator equipped with circulated-liquid-nitrogen cooling system has been developed on JAERI beam-line, BL11XU, at SPring-8. This cooling system has improved the performance of X-ray reflection. The system has difficulty for the operation because of a lack of the manual. So, it is required to establish a systematic guide of the system. Here we report a manual with fruitful know-how to operate the cryogenic cooling system on BL11XU safely and easily. The new manual is wholly tabulated and shows comments, instructions, and valve conditions in all one-step. The operator, by using this manual, can manipulate the system with no misoperation.

97 (Records 1-20 displayed on this page)