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Stabilization of a high-order harmonic generation seeded extreme ultraviolet free electron laser by time-synchronization control with electro-optic sampling

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High Power Laser Science and Engineering 2015年第2期3卷 1-10页

作者： H.tomizawa t.Sato K.Ogawa K.togawa t.tanaka t.Hara M.Yabashi H.tanaka t.ishikawa t.togashi S.Matsubara Y.Okayasu t.Watanabe E.J.takahashi K.Midorikawa M.Aoyama K.Yamakawa S.Owada A.Iwasaki K.Yamanouchi RIKEN SPring-8 Center Japan Synchrotron Radiation Research Institute RIKEN Center for Advanced Photonics Japan Atomic Energy Agency the University of tokyo

A fully coherent free electron laser(FEL) seeded with a higher-order harmonic(HH) pulse from high-order harmonic generation(HHG) is successfully operated for a sufficiently prolonged time in pilot user experiments by using a timing drift feedback. For HHG-seeded FELs, the seeding laser pulses have to be synchronized with electron bunches. Despite seeded FELs being non-chaotic light sources in principle, external laser-seeded FELs are often unstable in practice because of a timing jitter and a drift between the seeding laser pulses and the accelerated electron bunches. Accordingly,we constructed a relative arrival-timing monitor based on non-invasive electro-optic sampling(EOS). the EOS monitor made uninterrupted shot-to-shot monitoring possible even during the seeded FEL operation. the EOS system was then used for arrival-timing feedback with an adjustability of 100 fs for continual operation of the HHG-seeded FEL. Using the EOS-based beam drift controlling system, the HHG-seeded FEL was operated over half a day with an effective hit rate of 20%–30%. the output pulse energy was 20 μJ at the 61.2 nm wavelength. towards seeded FELs in the water window region, we investigated our upgrade plan to seed high-power FELs with HH photon energy of 30–100 e V and lase at shorter wavelengths of up to 2 nm through high-gain harmonic generation(HGHG) at the energy-upgraded SPring-8Compact SASE Source(SCSS) accelerator. We studied a benefit as well as the feasibility of the next HHG-seeded FEL machine with single-stage HGHG with tunability of a lasing wavelength.

关键词： arrival-timing monitor electro-optic sampling(EOS)

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Particle Shape Control of Crushed Stone by Autogenous Grinding Using a Stirred Mill

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Particle Shape Control of Crushed Stone by Autogenous Grindi...

第八届东亚资源再生技术国际会议

作者： N.Kotake Y.Miyano Y.Kanda t.ishikawa t.Itabashi Department of Chemistry and Chemical Engineering Yamagata University 4-3-16 Jonan Yonezawa-shi Yamagata992-8510 Japan Department of Chemistry and Chemical Engineering Yamagata University 4-3-16 Jonan Yonezawa-shi Yamagata992-8510 Japan Department of Chemistry and Chemical Engineering Yamagata University 4-3-16 Jonan Yonezawa-shi Yamagata992-8510 Japan Mistui Mining Co. LTD. 1 Koh-machi Tochigi-shi Tochigi 328-8503 Japan Mistui Mining Co. LTD. 1 Koh-machi Tochigi-shi Tochigi 328-8503 Japan

＜正＞A demand for the aggregates is increasing in the field of civil industry and architectural industry and so on. In these industries, the particle size and shape of aggregates are important factors and especially spherical or rounded particles are desired. In Japan, crushed stone is widely used as the aggregate material for the pavement or the construction. In this study based on the frictional action of material each other, an autogenous grinding of crushed stone was performed in order to eliminate squarish particles and get rounded ones for better aggregate materials. the experimental apparatus is a stirred mill with 4 impellers and the mill is made of stainless steel. the feed size and the feed mass of crushed stone were constant respectively. the particle shape was measured in the particle size range of 20 mm - 2.36 mm, and was evaluated by the shape index（= diameter of circumcircle / thickness） and the circularity（= perimeter of circle of equal projected area / perimeter of particle）. As a result, a decrease in the shape index and an increase in the circularity of crushed stone were observed with increasing grinding time. then, the shape index and the circularity had the limit value for the long time grinding. the tendencies in these variations were not changed by the measuring size. the limit values of the shape index and the circularity increased with decreasing measuring size respectively.

关键词： Autogenous grinding Stirred mill Crushed stone Particle shape

Study of Effect of Deuteration on Crystal Structure of Proteinase K by High Resolution X-ray Diffraction technique

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Study of Effect of Deuteration on Crystal Structure of Prote...

作者： t.ishikawa t.Chatake A.Kawaguchi Y.Yanagisawa S.Fujiwara Y.Morimoto Research Reactor Institute Kyoto University Faculty of Pharmaceutical Sciences Chiba Institute of Sciences Japan Atomic Energy Agency

INtRODUCtION:Deuteration of macromolecules is a popular technique for neutron diffraction *** incoherent neutron scattering from hydrogen atom is much longer than those of non-hydrogen atoms,therefore biomolecular samples are pre-deuterated by heavy water (DO) before neutron diffraction *** is a solvent molecule,of which chemical and physical properties resemble to natural water(HO).therefore,DO sometimes is used as a substitute for *** studies of structural biology,DO is used for lH-NMR spectrosco-

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Fabrication of functional material by using DNA-lipid complex and its optical property

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Fabrication of functional material by using DNA-lipid comple...

Photonics Asia 2004;Optoelectronics,Microelectronics,and Nanotech

作者： M.Wada Y.Kagami N.Ogata t.ishikawa S.Horinouchi Chitose Institute of Science and technology 758-65 Bibi Chitose Hokkaido 066-8655 Japan Chitose Institute of Science and technology 758-65 Bibi Chitose Hokkaido 066-8655 Japan New Energy and Industrial technology Development Organization (NEDO) 758-65 Bibi Chitose Hokkaido 066-8655 Japan Chitose Institute of Science and technology 758-65 Bibi Chitose Hokkaido 066-8655 Japan Nippon Aleph Chitose R&D Center 1-3-1 Kashiwadaiminami Chitose-shi Hokkaido 066-0009 Japan Chitose Institute of Science and technology 758-65 Bibi Chitose Hokkaido 066-8655 Japan

We observed optical properties of organic fluorescence materials doped DNA-CtMA and PMMA. the quantum yield in DNA-CtMA was higher than in PMMA. Amplified spontaneous emission properties of dye-doped

关键词： deoxyribonucleic acid , intercalate , fluorescent materials

Purification and Crystallization of Nattokinase from Bacillus subtilis natto

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Purification and Crystallization of Nattokinase from Bacillu...

作者： Y.Yanagisawa t.Chatake t.ishikawa Y.Morimoto I.Yasuda t.Ohsugi H.Sumi Faculty of Pharmaceutical Sciences Chiba Institute of Sciences Research Reactor Institute Kyoto University Department of Life Science Kurashiki University of Science and the Arts

INtRODUCtION:Nattokinase(NK) is abundantly contained in Japanese traditional food *** is a 275 ***(M.W.=27,724),which is produced by Bacillus subtilis *** previously reported that it would be a kind of serine proteases and has thrombolytic *** would be one of candidates for neutron protein crystallography,because a large amount of native NK can be easily obtained from Bacillus subtilis natto and a clinical application would be *** the present study,we purified NK and crystallized it for dif-

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氢在铝中的扩散系数

轻合金加工技术 1988年第4期 24-27+23页

作者： t.ishikawa R·B·MCLELLAN 肖亚庆

用粘稠电解液电解法测量了285～328K时氢在铝中的扩散系数。结果表明:从285K到熔点,氢在铝中的扩散是通过单级过程进行的。因为在此过程中观察到了包括晶格空位在内的俘获效应,因此,并不违背人Arrhenious特性。

关键词：扩散系数外推值现有数据千焦结合能束缚能氢原子空位浓度

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金属成形实验室的计算机辅助实验技术

模具技术 1986年第5期 109-116页

作者： N.Kanetake Y.tozawa t.Kato t.ishikawa 王正元

一、引言近年来,数字电子计算机技术的进展非常显著,特别是发明了功能强,价格便宜的微机。最新的微机具有容量大、易于用高级语言编程的特点(如FORtRAN语言),而它的体积和价格却大大地减小和降低。因此,在工业中,计算机不仅被用于管理... 详细信息

一、引言近年来,数字电子计算机技术的进展非常显著,特别是发明了功能强,价格便宜的微机。最新的微机具有容量大、易于用高级语言编程的特点(如FORtRAN语言),而它的体积和价格却大大地减小和降低。因此,在工业中,计算机不仅被用于管理中各种各样的数据处理,并且还用于生产中。典型的例子有计算机辅助设计与制造(CAD/CAM)、计算机辅助加工设计(CAPP)、数控(NC)。尽管计算机在多年前已用于实验室的数据处

关键词：采样保持器计算机微机仪器微型计算机数字计数器数据处理数据采集实验室金属成形

π~0 Photoproduction on Deuteron for Photon Energies from 0.6 to 1.15 GeV

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原子核物理评论 2009年第S1期26卷 104-108页

作者： F.Miyahara H.Fukasawa R.Hashimoto t.ishikawa M.Itoh t.Iwata H.Kanda J.Kasagi H.Kato t.Kinoshita K.Maeda M.Matsuzawa t.Michigami K.Motiduki K.Murakami t.Nakabayashi K.Nawa t.Nomura K.Okamura H.Okamura H.Okuyama Y.Onodera Y.Saito t.Sasaki H.Shimizu t.Shishido S.Suzuki K.Suzuki Y.tajima S.takita t.takahashi H.Ueno S.Yamaguchi H.Yamazaki H.Y.Yoshida Laboratory of Nuclear Science Tohoku University Mikamine 1-2-1 Cyclotoron and Radioisotope Center Tohoku University Department of Physics Yamagata University Department of Physics Tohoku University Research Center for Nuclear Physics Osaka University KEK

Differential and total cross sections of the γp→π0p and the γd→π0pn reaction were measured for photon energies between 640 and 1 150 MeV. the data have been compared with SAID and MAID model calculations. π0 photoproduction on the deuteron shows a strong suppression of the 2nd resonance which is clearly seen in the γp→π0p reaction.

关键词： pion photoproduction resonance

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An event mixing technique for Bose-Einstein correlations of two pions in photoproduction around 1 GeV

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Chinese Physics C 2016年第11期40卷 67-74页

作者：何庆华 H.Fujimura H.Fukasawa R.Hashimoto Y.Honda t.ishikawa t.Iwata S.Kaida J.Kasagi A.Kawano S.Kuwasaki K.Maeda S.Masumoto M.Miyabe F.Miyahara K.Mochizuki N.Muramatsu A.Nakamura K.Nawa S.Ogushi Y.Okada Y.Onodera K.Ozawa Y.Sakamoto M.Sato H.Shimizu H.Sugai K.Suzuki Y.tajima S.takahashi Y.taniguchi Y.tsuchikawa H.Yamazaki R.Yamazaki H.Y.Yoshida Research Center for Electron Photon Science Tohoku University Institute of Fluid Physics China Academy of Engineering Physics Department of Physics Wakayama Medical University Department of Physics Yamagata University Department of Information Science Tohoku Gakuin University Department of Physics Tohoku University Department of Physics University of Tokyo Accelerator Laboratory KEK Institute of Particle and Nuclear Studies KEK Wakasa-wan Energy Research Center

We have developed an event mixing technique to observe Bose-Einstein correlations （BEC） between two identical neutral pions produced in photo-induced reactions in the non-perturbative QCD energy region. It is found that the missing-mass consistency cut and the pion-energy cut are essential for the event mixing method to effectively extract BEC observables. A Monte Carlo （MC） simulation is used to validate these constraints and confirms the efficiency of this method. Our work paves the way for similar BEC studies at lower energies where the multiplicity of emitted bosons is limited.

关键词： Bose-Einstein correlations photoproduction event mixing

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