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Journal Articles

Synchrotron radiation-based M$"o$ssbauer spectra of $$^{174}$$Yb measured with internal conversion electrons

Masuda, Ryo*; Kobayashi, Yasuhiro*; Kitao, Shinji*; Kurokuzu, Masayuki*; Saito, Makina*; Yoda, Yoshitaka*; Mitsui, Takaya; Iga, Fumitoshi*; Seto, Makoto

Applied Physics Letters, 104(8), p.082411_1 - 082411_5, 2014/02

 Times Cited Count:10 Percentile:52.22(Physics, Applied)

A detection system for synchrotron-radiation (SR)-based M$"o$ssbauer spectroscopy was developed to enhance the nuclear resonant scattering counting rate and thus increase the available nuclides. In the system, a windowless avalanche photodiode (APD) detector was combined with a vacuum cryostat to detect the internal conversion (IC) electrons and fluorescent X-rays accompanied by nuclear de-excitation. As a feasibility study, the SR-based M$"o$ssbauer spectrum using the 76.5 keV level of $$^{174}$$Yb was observed without $$^{174}$$Yb enrichment of the samples. The counting rate was five times higher than that of our previous system, and the spectrum was obtained within 10 h. This result shows that nuclear resonance events can be more efficiently detected by counting IC electrons for nuclides with high IC coefficients. Furthermore, the windowless detection system enables us to place the sample closer to the APD elements and is advantageous for nuclear resonant inelastic scattering measurements. Therefore, this detection system can not only increase the number of nuclides accessible in SR-based M$"o$ssbauer spectroscopy but also allows the nuclear resonant inelastic scattering measurements of small single crystals or enzymes with dilute probe nuclides that are difficult to measure with the previous detection system.

Journal Articles

Report of ERL-2005 Workshop

Hajima, Ryoichi; Suwada, Tsuyoshi*

Hoshako, 18(3), p.200 - 201, 2005/05

no abstracts in English

Journal Articles

An Analysis of the coherent synchrotron radiation effect in an energy-recovery linac by first-order transfer matrix

Hajima, Ryoichi

Dai-14-Kai Kasokuki Kagaku Kenkyu Happyokai Hokokushu, p.401 - 403, 2003/11

We propose a novel approach to the analysis of the coherent synchrotron radiation (CSR) effect on beam dynamics in energy-recovery linacs (ERL). Since an ERL return-arc consists of a large number of dipole and quadrupole magnets, it is not a practical way to search an optimum design by time-consuming particle simulations. We show that a first-order transfer matrix can be applied to calculate the emittance growth due to the CSR in the linear regime, weak CSR limit. The optimum design of ERL arcs such as triple-bend achromat lattice is easily obtained by matrix calculation. As an example, optimization of a 3GeV ERL arc is presented.

Journal Articles

Structure of oxide glasses by synchrotron X-ray and neutron diffraction

Suzuya, Kentaro

Hamon, 13(1), p.51 - 55, 2003/01

With the arrival of the latest generation of synchrotron sources and the introduction of advanced insertion devices, the high-energy (E $$>$$ 30 keV) X-ray diffraction technique has become feasible, leading to new approaches in the quantitative study of the structure of disordered materials. Recently, the high-energy X-ray diffraction data have been combined with neutron diffraction data from a pulsed source to provide more detailed and reliable structural information than that hitherto available. We have developed a two-axis diffractometer for glass, liquid and amorphous materials at the SPring-8 high-energy X-ray diffraction beamline BL04B2. Furthermore, we have succeeded to analyze the intermediate-range order of network forming glasses, SiO$$_{2}$$, B$$_{2}$$O$$_{3}$$, and GeO$$_{2}$$ by the reverse Monte Carlo (RMC) modelling technique with special focused on the ring structures using both high-energy X-ray and neutron diffraction data.

Journal Articles

Cost estimation of an energy recovery Linac light source

Sawamura, Masaru; Hajima, Ryoichi; Kikuzawa, Nobuhiro; Minehara, Eisuke; Nagai, Ryoji; Nishimori, Nobuyuki

Proceedings of 2003 Particle Accelerator Conference (PAC 2003) (CD-ROM), p.3449 - 3451, 2003/00

no abstracts in English

Journal Articles

Linac optics optimization for energy recovery Linacs

Nagai, Ryoji; Hajima, Ryoichi; Kikuzawa, Nobuhiro; Minehara, Eisuke; Nishimori, Nobuyuki; Sawamura, Masaru

Proceedings of 2003 Particle Accelerator Conference (PAC 2003) (CD-ROM), p.3443 - 3445, 2003/00

no abstracts in English

Journal Articles

The Structures of alkylimidazolium fluorohydrogenate molten salts studied by high-energy X-ray diffraction

Hagiwara, Rika*; Matsumoto, Kazuhiko*; Tsuda, Tetsuya*; Ito, Yasuhiko*; Kohara, Shinji*; Suzuya, Kentaro; Matsumoto, Hajime*; Miyazaki, Yoshinori*

Journal of Non-Crystalline Solids, 312-314, p.414 - 418, 2002/10

 Times Cited Count:32 Percentile:12.15(Materials Science, Ceramics)

The structures of a series of XF$$^{.}$$2.3HF (X= 1-methylimidazolium (MI), 1-ethyl-3-methylimidazolium (EMI), 1-butyl-3-methylimidazolium (BMI), 1-hexyl-3-methyl-imidazolium (HMI)) room temperature molten salts have been investigated by high-energy synchrotron X-ray diffraction technique. The correlation peaks appeared in the total correlation function are mainly ascribed to intra-molecular correlation of alkylimidazolium cations. However, it is suggested that the peak at around 3.6 $AA is ascribed not only to intra-molecular but also inter-molecular correlation of the cation. The contribution of the latter is also supported by the first sharp diffraction peak of the total structure factor found at almost the same position as that of a Bragg peak in the simulated X-ray diffraction pattern of solid EMIF$^{.}$$HF with a layered structure, corresponding to the layer separation of

Journal Articles

A Full-DC injector for future ERL light sources

Hajima, Ryoichi; Minehara, Eisuke

Proceedings of 27th Linear Accelerator Meeting in Japan, p.169 - 171, 2002/08

We propose a full-DC injector for a future ERL light source. The injector consists of a DC accelerator (Dynamitron type), a magnetic merger and a buncher-booster. We have found that the injector can generate electron bunches required for ERL light sources and RF coupler power of the buncher booster is also decreased by partial energy-recovery.

Journal Articles

High-energy X-ray diffraction studies of short- and intermediate-range structure in oxide glasses

Suzuya, Kentaro; Kohara, Shinji*

Materia, 41(3), p.206 - 215, 2002/03

With the arrival of the latest generation of synchrotron sources and the introduction of advanced insertion devices, the high-energy (E $$>$$ 30 keV) X-ray diffraction technique has become feasible, leading to new approaches in the quantitative study of the structure of disordered materials. Recently, the high-energy X-ray diffraction data have been combined with neutron diffraction data from a pulsed source to provide more detailed and reliable structural information than that hitherto available. We have developed a two-axis diffractometer for glass, liquid and amorphous materials at the SPring-8 high-energy X-ray diffraction beamline BL04B2. Furthermore, we have succeeded to analyze the intermediate-range order of network forming glasses, SiO$$_{2}$$, B$$_{2}$$O$$_{3}$$, and GeO$$_{2}$$ by the reverse Monte Carlo (RMC) modelling technique with special focused on the ring structures using both high-energy X-ray and neutron diffraction data.

Journal Articles

Intermediate range order of vitreous silica studied by high energy X-ray diffraction, neutron diffraction and reverse Monte Carlo modelling

Kohara, Shinji*; Suzuya, Kentaro

Physics and Chemistry of Glasses, Vol.43C 2002, p.51 - 54, 2002/00

With the arrival of the latest generation of synchrotron sources and the introduction of advanced insertion devices, the high-energy (E $$>$$ 30keV) X-ray diffraction technique has become feasible, leading to new approaches in the quantitative study of the structure of disordered materials. Recently, the high-energy X-ray diffraction data have been combined with neutron diffraction data from a pulsed source to provide more detailed and reliable structural information than that hitherto available. We have developed a two-axis diffractometer for glass, liquid and amorphous materials at the SPring-8 high-energy X-ray diffraction beamline BL04B2. Furthermore, we have succeeded to analyze the intermediate-range order of a typical network forming glass, silica (SiO$$_{2}$$), by reverse Monte Carlo (RMC) modelling technique with special focused on the ring structures using both high-energy X-ray and neutron diffraction data.

Oral presentation

Experimental evidences of light's orbital angular momentum carried by helical undulator harmonics

Sasaki, Shigemi*; Miyamoto, Atsushi*; Hosaka, Masahito*; Yamamoto, Naoto*; Kyo, Ayataro*; Kato, Masahiro*; Imazono, Takashi; Koike, Masato

no journal, , 

The phenomenon of higher harmonic radiation from a helical undulator carrying orbital angular momentum (OAM) attracts a great deal of attention because this novel property may be used as a new probe for synchrotron radiation science that would be performed in diffraction limited light source facilities. Although a diffraction limited VUV and X-ray sources do not yet exist, the 750 MeV UVSOR-III is already a diffraction limited light source in the UV region. In this ring, a tandem-aligned double-APPLE undulator system is installed. Using this set-up, we observed spiral interference patterns between two different harmonic radiations with a scanning fiber multi-channel spectrometer and a CCD camera placed at the end of BL1U beamline. By these measurements, various interference patterns such as single, double, and triple spirals were observed which concur with the theoretical prediction for every mode in the right or left circular polarization.

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