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Fujii, Yasuhiko
no journal, ,
no abstracts in English
Shobuda, Yoshihiro
no journal, ,
no abstracts in English
Utsuno, Yutaka
no journal, ,
no abstracts in English
Nagame, Yuichiro
no journal, ,
no abstracts in English
Tamura, Fumihiko; Schnase, A.; Yamamoto, Masanobu; Nomura, Masahiro; Yoshii, Masahito*; Omori, Chihiro*; Takagi, Akira*; Hara, Keigo*; Anami, Shozo*; Ezura, Eiji*
no journal, ,
The J-PARC Rapid cycling synchrotron(RCS) requires a verystable and precise low level RF(LLRF) control system to handle theultra-high proton beam currents. The MA-loaded low-Q cavities for theRCS are driven by the superposition of the dual-harmonic RF signal forboth the acceleration and the longitudinal bunch shaping. We employ afull-digital system based on direct digital synthesis(DDS). Themulti-harmonic RF signals generated by the DDS are easily synchronizedwithout PLLs. We describe the design and the structure of the LLRFblocks. The common feedback loops are used for the stabilizing thebeam orbit and phase as well as the RF voltages of the cavity. Theheavy beam loading effect is compensated by using the beam feedforwardmethod. We also present the test results of the recently manufacturedmodules.
Hashiba, Kimihiro; Matsui, Hiroya; Sato, Toshinori; Seno, Yasuhiro
no journal, ,
In this study, multi-stage creep tests were conducted with tuff and siliceous rock. The creep stresses of each stage and the duration of the first stage were variable, and the effect of the stress history on creep behavior was examined. It was found that the primary creep strain rate might be decreased by the stress history. In particular, the effect of the stress history was notable after the first stage with the large creep stress and the long duration. It was also found that the effect of the stress history of siliceous rock was larger than that of tuff.
Tamada, Masao
no journal, ,
In the radiation processing of polymer, graft polymerization and crosslinking induced by high energy radiation can lead the modification of polymer materials. Metal adsorbent synthesized by graft polymerization was applied to the removal of cadmium from scallop processing and the recovery of uranium from seawater. Crosslinking was available to improve the thermal properties of biodegradable polymer such as poly-lactic acid.
Matsuhashi, Shimpei
no journal, ,
no abstracts in English
Kobayashi, Yasuhiko
no journal, ,
no abstracts in English
Kawata, Norio; Yano, Soichiro
no journal, ,
Russian Surplus W-Pu was produced by byproducts of disarmament of nuclear weapon and recognized as a serious threat of nuclear proliferation. US and RF concluded an agreement to dispose of no less than 34 ton-Pu each in 2000. JAEA has conducted to realize BN600 vipac fuel option, which is MOX vipac fuel made with W-Pu is burned in BN600 reactor, based on experiences of Pu utilization and fast reactor technology in a decade years. Technical feasibility is established through several cooperative studies with Russian Institutes. Since this option is confirmed as a low-cost and early disposition method, recently, US and RF seek to accelerate this option prior to VVER1000 option. This paper will provide a description of progress on BN600 vipac fuel option and future prospects of whole plan of Russian Surplus W-Pu disposition of 34 ton.
Hada, Kazuhiko; Nishi, Hiroshi; Hirose, Takanori; Mori, Kensuke; Aoki, Shoji*; Wada, Masahiko*; Yamamichi, Tetsuo*
no journal, ,
Chromium-zirconium copper as precipitation hardened copper alloy is examined as one of the structural materials used for the ITER in vacuum vessel components. The process that consists of a thermomechanical treatments series of the solution treatment with rapid cooling to obtain the supersaturated solid solution and the aging treatment etc., is adopted in order to obtain the demanded high strength in manufacturing of this alloy material. However, as this alloy is precipitation hardened copper alloy, it is concerned that the great change in the strength characteristic is caused by the thermomechanical treatments conditions, especially the difference of the quenching cooling rate after the solution treatment in manufacturing. In this research, the influence of the quenching cooling rate condition after the solution treatment and the other conditions on this copper alloy was investigated by measuring the tensile test properties of the specimens that are prepared by treatments with some quenching cooling rate conditions after the solution treatment and aging treatment. One of the typical results from this study is that, for the quenching cooling rate after the solution treatment, it was understood that the cooling rate change from 1 to 10
C/s causes the great growth in the tensile strength. Therefore, when this alloy component is manufactured by heat history process like HIP process and needed to be treated solution treatment to be use for the structural component, it is important to guarantee the strength of the product by checking the quenching cooling rate after the solution treatment.
/U
in molten NaCl-2CsClNagai, Takayuki; Uehara, Akihiro*; Shirai, Osamu*; Yamana, Hajimu*
no journal, ,
no abstracts in English
Adachi, Motoyasu; Tamada, Taro; Sato, Katsuya*; Narumi, Issei; Kuroki, Ryota
no journal, ,
The resistance of Deinococcus radiodurans to 
-ray is 1000 times higher than that of human cells. PprA is the novel protein which promotes repairing DNA, and play a key role in the ability to resist to the radiation. The characterization of PprA have showed: (1) that the expression of PprA is controlled under another novel protein of PprI (2) that PprA promotes ligase reaction: (3) that pprA exhibits the ability to bind on DNA. In this study, our objective is the crystal structure analysis of PprA to reveal its structure-function relationships and for application as genetic and clinical tools. Here, we constructed the E. coli expression and purification system of PprA. Using the purified PprA, some small crystals in size were obtained after screening of conditions for crystalization. Beased on the analyses of DNA-PprA interaction, we showed that 280 molecules of PprA at least can bind on a DNA molecule of pUC19 plasmid (2686bp). In addition, we indicated that several DNA-PprA complexes may form higher complex, when DNA includes terminal end or nick (the cleaved part on a DNA strand). These results are important knowledge in molecular assembly and function of PprA.
Komuro, Yo; Hirade, Tetsuya; Suzuki, Ryoichi*; Odaira, Toshiyuki*; Muramatsu, Makoto*
no journal, ,
The annihilation rays from the para-pojitoronium (p-Ps) state gives narrower Doppler broadening. The broader Doppler broadening was observed at very young age region that is mainly from the annihilation process of p-Ps. It was explained by the delayed Ps slowing down and the delayed Ps formation. We have successfully obtained the experimental evidence of the delayed Ps formation.
Miyauchi, Toru; Koarashi, Jun; Mikami, Satoshi; Kozawa, Tomoyasu*; Yokota, Tomokazu*; Isaka, Keisuke*; Akiyama, Kiyomitsu
no journal, ,
no abstracts in English
Taguchi, Mitsumasa; Baldacchino, G.*; Pin, S.*; Vigneron, G.*; Hichel, B.*; Kojima, Takuji
no journal, ,
no abstracts in English
Mikami, Satoshi; Miyauchi, Toru; Koarashi, Jun; Kozawa, Tomoyasu*; Yokota, Tomokazu*; Isaka, Keisuke*; Akiyama, Kiyomitsu
no journal, ,
no abstracts in English
Koike, Masato; Sano, Kazuo*; Sasai, Hiroyuki*
no journal, ,
The flat field spectrographs are coming into the limelight once again taking the advantages of the rapid progress of the solid state imaging devices, and the needs of the ultra-high speed simultaneous measurements reaching to femto- or atto- seconds. A typical soft X-ray spectrograph employs a mechanically ruled varied-line-spacing spherical grating. We have also developed a holographic grating for this spectrograph,and spectrographs of this type are used in a variety of research areas. However it utilizes a pseudo-flat image plane near the point of inflection of the focal curve called lemniscates. Therefore the obtainable resolving power is limited and it is difficult to reach to several thousands. Also it is still a challenging subject to extend to the multi-keV region due to the degradation of the diffraction efficiency. We describe the recent progress of the soft X-ray flat field holographic grating spectrographs, a design study of a high resolution spectrograph using a varied-line-spacing plane grating, and the possible options to extend them to the multi-keV region.
Fukaya, Yuki; Kawasuso, Atsuo; Ichimiya, Ayahiko
no journal, ,
no abstracts in English
SR Stufies on f-electron compounds