Antimony from brake dust to the combined sewer collection system via road effluent under rainy conditions

Ozaki, Hirokazu*; Yoshimura, Kazuya; Asaoka, Yoshihiro*; Hayashi, Seiji*

Environmental Monitoring and Assessment, 193(6), p.369_1 - 369_9, 2021/06

https://doi.org/10.1007/s10661-021-09152-5

J-PARC 3-GeV RCS; 1-MW beam operation and beyond

Hotchi, Hideaki; Harada, Hiroyuki; Hayashi, Naoki; Kinsho, Michikazu; Okabe, Kota; Saha, P. K.; Shobuda, Yoshihiro; Tamura, Fumihiko; Yamamoto, Kazami; Yamamoto, Masanobu; et al.

Journal of Instrumentation (Internet), 15(7), p.P07022_1 - P07022_16, 2020/07

https://doi.org/10.1088/1748-0221/15/07/P07022

no abstracts in English

Reducing the beam impedance of the kicker at the 3-GeV rapid cycling synchrotron of the Japan Proton Accelerator Research Complex

Shobuda, Yoshihiro; Chin, Y. H.*; Hayashi, Naoki; Irie, Yoshiro*; Takayanagi, Tomohiro; Togashi, Tomohito; Toyama, Takeshi*; Yamamoto, Kazami; Yamamoto, Masanobu

Physical Review Accelerators and Beams (Internet), 21(6), p.061003_1 - 161003_15, 2018/06

https://doi.org/10.1103/PhysRevAccelBeams.21.061003

no abstracts in English

Simulation, measurement, and mitigation of beam instability caused by the kicker impedance in the 3-GeV rapid cycling synchrotron at the Japan Proton Accelerator Research Complex

Saha, P. K.; Shobuda, Yoshihiro; Hotchi, Hideaki; Harada, Hiroyuki; Hayashi, Naoki; Kinsho, Michikazu; Tamura, Fumihiko; Tani, Norio; Yamamoto, Masanobu; Watanabe, Yasuhiro; et al.

Physical Review Accelerators and Beams (Internet), 21(2), p.024203_1 - 024203_20, 2018/02

AA2017-0659.pdf:3.34MB

https://doi.org/10.1103/PhysRevAccelBeams.21.024203

Simulation studies and measurements of beam instabilities caused by the kicker impedance at high intensities in the 3-GeV RCS of J-PARC

Saha, P. K.; Shobuda, Yoshihiro; Hotchi, Hideaki; Harada, Hiroyuki; Hayashi, Naoki; Kinsho, Michikazu; Nomura, Masahiro; Tamura, Fumihiko; Tani, Norio; Watanabe, Yasuhiro; et al.

Proceedings of 7th International Particle Accelerator Conference (IPAC '16) (Internet), p.589 - 591, 2016/06

https://doi.org/10.18429/JACoW-IPAC2016-MOPOR003

High intensity beam trial of up to 540 kW in J-PARC RCS

Hotchi, Hideaki; Harada, Hiroyuki; Hayashi, Naoki; Kinsho, Michikazu; Saha, P. K.; Shobuda, Yoshihiro; Tamura, Fumihiko; Yamamoto, Kazami; Yamamoto, Masanobu; Yoshimoto, Masahiro; et al.

Proceedings of 4th International Particle Accelerator Conference (IPAC '13) (Internet), p.3836 - 3838, 2014/07

https://accelconf.web.cern.ch/accelconf/IPAC2013/papers/thpwo033.pdf

In November 2012, we have performed a high intensity beam trial of up to 540 kW. The beam loss for 540 kW intensity beam was well reduced from 30% to 2% by injection painting. This remaining beam loss of 2%, arising from foil scattering and 100-kHz field ripple induced by injection bump field, corresponds to 650 W in power, which is still less than 1/6 of the current collimator capability of 4 kW. The numerical simulation well reproduced the experimental results. Accelerator modelling and quantitative benchmarking between experiment and numerical simulation becomes feasible. The numerical simulation very much helped us to understand the mechanism of observed beam loss. Also several beam loss mitigation ideas were proposed with a help of numerical simulation and verified by experiment.

Beam power and residual dose history of J-PARC RCS

Yamamoto, Kazami; Hotchi, Hideaki; Harada, Hiroyuki; Hayashi, Naoki; Kinsho, Michikazu; Saha, P. K.; Tamura, Fumihiko; Yamamoto, Masanobu; Yoshimoto, Masahiro; Nakane, Yoshihiro; et al.

Progress in Nuclear Science and Technology (Internet), 4, p.238 - 242, 2014/04

https://doi.org/10.15669/pnst.4.238

A 3 GeV rapid cycling synchrotron (RCS) at J-PARC was commissioned in October 2007. Afterwards, the beam intensity was increased through a beam study, and the RCS has continuously provided a proton beam 100 kW to the neutron target since October 2009. With renewed efforts brought about by beam commissioning, we have reduced losses in the RCS and achieved low-loss operation. We present the history of the operational beam power and the residual dose distributions after operation.

mutant in a salt-tolerant accession revealed an importance of salt acclimation ability in plant salt tolerance

Ariga, Hirotake*; Katori, Taku*; Yoshihara, Ryohei*; Hase, Yoshihiro; Nozawa, Shigeki; Narumi, Issei; Iuchi, Satoshi*; Kobayashi, Masatomo*; Tezuka, Kenji*; Sakata, Yoichi*; et al.

Plant Signaling & Behavior (Internet), 8(7), p.e24779_1 - e24779_5, 2013/07

https://doi.org/10.4161/psb.24779

Based on analysis of the salinity tolerance among 354 accessions, some accessions showed greater salt shock tolerance compared with a reference accession, Col-0 on a typical assay with drastic change in NaCl concentration from 0 mM to 225 mM. On the other hand, several accessions including Zu-0 exhibited marked acquired salt tolerance, which is induced after exposure to moderate salt stress (salt acclimation ability). It is likely that Arabidopsis plants have at least two types of tolerance abilities, salt shock tolerance and salt acclimation. To dissect the salt tolerance mechanisms of the salt tolerant accessions, we isolated a salt-sensitive mutant from ion beam-mutagenized Zu-0 seedlings. The mutant showed severe growth inhibition under salt shock stress due to a single base deletion in SOS1 gene as well-known salt shock tolerance gene, even more salt sensitive than Col-0. Nevertheless, the mutant was able to survive on the salt acclimation with 100 mM NaCl for 7 days followed with 750 mM sorbitol for 20 days (salt acclimation assay) as well as the Zu-0 wild type, whereas Col-0 showed apparent chlorosis under the condition. We propose that a gene for salt acclimation ability is different from a gene for salt shock tolerance and plays an important role in acquisition for marked salt- or osmotic tolerance.

The Result of beam commissioning in J-PARC 3-GeV RCS

Harada, Hiroyuki; Hotchi, Hideaki; Saha, P. K.; Shobuda, Yoshihiro; Hayashi, Naoki; Yamamoto, Kazami; Yoshimoto, Masahiro; Tamura, Fumihiko; Yamamoto, Masanobu; Kinsho, Michikazu; et al.

Proceedings of 52nd ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams (HB 2012) (Internet), p.339 - 343, 2012/09

J-PARC 3-GeV RCS has started the beam commissioning since Oct. 2007. In the beam commissioning, the beam tuning for basic parameters and high-intensity operation has been continuously performed. This presentation will describe the results of the beam-loss reduction and minimization for high-intensity operation.

Influence of wire parameters on critical current versus strain characteristics of bronze processed NbSn superconducting wires

Miyatake, Takayuki*; Murakami, Yukinobu*; Kurahashi, Hidefumi*; Hayashi, Seiji*; Zaitsu, Kyoji*; Seeber, B.*; Mondonico, G.*; Nabara, Yoshihiro

IEEE Transactions on Applied Superconductivity, 22(3), p.4805005_1 - 4805005_5, 2012/06

https://doi.org/10.1109/TASC.2011.2179697

In order to develop bronze processed NbSn strands for ITER TF and CS coils, the influences of various parameters of NbSn strands such as filament diameter, barrier materials, barrier thickness, heat treatment pattern and Ti addition on critical current () vs. axial strain characteristics were investigated. The change of theses parameters brought significant changes to superconducting properties involving and n-value at zero applied strain. In spite of different strand parameters, the strain dependency of normalized was almost the same, except for Ti-addition affecting the critical field . Based on the results, bronze processed NbSn strands with non-Cu critical current density more than 1,100 A/mm at 12T, 4.2K have been successfully developed for the CS coil.