研究者詳細 - 北口　雅暁

論文 - 北口　雅暁

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Demonstration of focusing by a neutron accelerator 査読有り

Yasushi Arimoto, Peter Gertenbort, Sohei Imajo, Yoshihisa Iwashita, Masaaki Kitaguchi, Yoshichika Seki, Hirohiko M. Shimizu, Tamaki Yoshioka

Physical Review A 86 巻頁： 023843 2012年8月

Demonstration of focusing by a neutron accelerator 査読有り

Arimoto, Y; Gertenbort, P; Imajo, S; Iwashita, Y; Kitaguchi, M; Seki, Y; Shimizu, HM; Yoshioka, T

PHYSICAL REVIEW A 86 巻 ( 2 ) 2012年8月

Demonstration of optical thickness measurement using multilayer cold neutron interferometer 査読有り

Y. Seki, J. Uda, H. Funahashi, M. Kitaguchi, M. Hino, Y. Otake, K. Taketani, H. M. Shimizu

5TH EUROPEAN CONFERENCE ON NEUTRON SCATTERING 340 巻 2012年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：IOP PUBLISHING LTD

We have measured the optical thickness of a phase object for the first time using multilayer cold neutron interferometer. The measured phase shift of 15.1 +/- 1.9 wavelength agreed with the expected value of 17.4 +/- 0.7 wavelength due to an about 600-mu m-thick silicon plate. This demonstration reconfirmed that two paths in our new interferometer were completely separate, and showed its applicability into various precise measurements.

DOI： 10.1088/1742-6596/340/1/012039

Web of Science

Research toward the development of compact neutron interference imaging instrument with gratings 査読有り

Yoshie Otake, Margie Olbinado, Yoshichika Seki, Katsuya Hirota, Yutaka Yamagata, Jungmyoung Ju, Tomohiro Adachi, Shinya Morita, Yoshihisa Iwashita, Masahiro Hino, Masahiro Ichikawa, Masaaki Kitaguchi, Toshio Takahashi, Hideki Yoshizawa, Seung Wook Lee, Wataru Yashiro, Atsushi Momose

5TH EUROPEAN CONFERENCE ON NEUTRON SCATTERING 340 巻 2012年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：IOP PUBLISHING LTD

The neutron interference imaging experiment with two absorption gratings has been done. We develop new way to fabricate absorption gratings for neutron with the pitch of 150 mu m, 180 mu m, and 200 mu m. Compact imaging detector system is developed, whose weight is 2kg. Small break in an acrylic plate, the welded place of Nb plate were observed, it reveals that the neutron interference imaging method can become new method of a nondestructive inspection for reinforced plastics and composite material such as CFRP and so on.

DOI： 10.1088/1742-6596/340/1/012035

Web of Science

Present status of neutron fundamental physics at J-PARC 査読有り

Arimoto, Y; Funahashi, H; Higashi, N; Hino, M; Hirota, K; Imajo, S; Ino, T; Iwashita, Y; Katayama, R; Kitaguchi, M; Mishima, K; Muto, S; Oide, H; Otono, H; Seki, Y; Shima, T; Shimizu, HM; Taketani, K; Yamada, T; Yamashita, S; Yoshioka, T

PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS 2012 巻 ( 1 ) 2012年

Development of Two-Dimensional Scintillation Detectors for Neutron Spin Echo Spectrometers in J-PARC/MLF 査読有り

T. Nakamura, M. Katagiri, T. Hosoya, K. Toh, M. Kitaguchi, M. Hino, T. Ebisawa, K. Sakasai, K. Soyama

2012 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE RECORD (NSS/MIC) 頁： 222 - 225 2012年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：IEEE

A two-dimensional scintillation detector comprising of a single screen of flat neutron-sensitive scintillator with wavelength shifting fibers read out was developed. The detector was designed to meet the requirements for the modulated intensity by zero effort spectrometer (MIEZE) to be installed in the J-PARC/MLF. The ZnS/(B2O3)-B-10 scintillator screen that had 0.2 +/- 0.05 mm in thickness was implemented to the detector to minimize the time parallax within the scintillator. The detector design and the detector performances are presented.

DOI： 10.1109/NSSMIC.2012.6551098

Web of Science

Development of longitudinal-gradient magnet for time focusing of ultra-cold neutron with anisotropic inter-pole 査読有り

Yasushi Arimoto, Yoshihisa Iwashita, Tamaki Yoshioka, Masaaki Kitaguchi, Sohei Imajo, Hirohiko M. Shimizu, Koichiro Asahi, Takashi Ino, Yoshio Kamiya, Kenji Mishima, Suguru Muto, Kenji Sakai, Tatsushi Shima, Kaoru Taketani, Satoru Yamashita, Akihiro Yoshimi

IEEE Transactions on Applied Superconductivity 22 巻 ( 3 ) 2012年

掲載種別：研究論文（学術雑誌）

Ultra-cold neutron (UCN) is attractive for a search of the neutron electric dipole moment (nEDM). It is crucial to store UCNs with high density in a bottle for nEDM measurement apparatus. To increase the density, time focusing technique can be useful, where slow neutrons are accelerated and fast neutrons are decelerated by using magnetic potential. This device is called rebuncher. The rebuncher consists of a gradient magnet, RF coil, and neutron guide. The magnet generates a field gradient of 3.5 T/m (from 1 T to 0.2 T within 24 cm) in the longitudinal direction. By using anisotropic inter-poles, the magnet is compact and keeps the gradient uniform. The fabricated magnet showed good performance as designed. © 2012 IEEE.

DOI： 10.1109/TASC.2012.2183569

Web of Science

Scopus

A compact TOF-SANS using focusing lens and very cold neutrons 査読有り

Masako Yamada, Yoshihisa Iwashita, Toshiji Kanaya, Norifumi L. Yamada, Hirohiko M. Shimizu, Kenji Mishima, Masahiro Hino, Masaaki Kitaguchi, Katsuya Hirota, Peter Geltenbort, Bruno Guerard, Giuliana Manzin, Ken Anderson, Jyotsana Lal, John M. Carpenter, Markus Bleuel, Shane J. Kennedy

PHYSICA B-CONDENSED MATTER 406 巻 ( 12 ) 頁： 2453 - 2457 2011年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

We are developing a high-resolution small angle neutron scattering instrument for very cold neutrons (VCN). Our concept includes a magnetic lens for focusing of the beam at the detector plane. The lens consists of one permanent-magnet sextupole array rotating outside another stationary sextupole array, to focus a pulsed white beam of neutrons. Thus the instrument operates in time of flight mode. The prototype magnetic lens has a bore of 15 mm diameter and length of 66 mm, producing a magnetic field gradient oscillating from 1.5 x 10(4) to 5.9 x 10(4) T/m(2), with frequency <= 25 Hz. A torque-canceling magnet around the lens suppresses the torque of rotation from the outer array to 1/3.
We have demonstrated the performance of the lens, over wavelength range from 30 to 48 angstrom, on the PF2-VCN beam line at the Institut Laue-Langevin, France. The focused beam image was the same size as the source, without chromatic aberration, with focal length of 1.14 m. We also studied the performance of this configuration for high-resolution SANS, in a compact geometry (just 5 m long). The measurable q range of this system was 0.009 angstrom(-1) <= q <= 0.3 angstrom(-1) or 0.004 angstrom(-1) <= q <= 0.08 angstrom(-1) for sample to detector distances of 100 and 465 mm, respectively. Here, we present the results of our lens characterization study along with the SANS results on a tri-block copolymer (F127 Pluronic) and on a stretched polymer blend (with the Shish-Kebab structure). (C) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2010.12.002

Web of Science

High resolution NRSE spectrometer with 2D-focusing supermirrors 査読有り

Masaaki Kitaguchi, Masahiro Hino, Yuji Kawabata, Seiji Tasaki, Ryuji Maruyama, Toru Ebisawa

PHYSICA B-CONDENSED MATTER 406 巻 ( 12 ) 頁： 2470 - 2472 2011年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

In the neutron resonance spin echo (NRSE) spectrometer [1] the divergent beam provides the deviation of the flight length, which makes the phase difference between neutron spin states and also decreases the contrast of the spin echo signals. The flight length can be adjusted by using parabolic focusing mirrors [11], which can be fabricated with replica technique. Correction for beam divergence effect in the NRSE spectrometer using 2D-focusing supermirrors will be discussed. (C) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2010.11.062

Web of Science

Measurement of the neutron beam polarization of BL05/NOP beamline at J-PARC 査読有り

T. Ino, Y. Arimoto, T. Yoshioka, K. Mishima, K. Taketani, S. Muto, H. M. Shimizu, H. Kira, Y. Sakaguchi, T. Oku, K. Sakai, T. Shinohara, J. Suzuki, H. Otono, H. Oide, S. Yamashita, S. Imajo, H. Funahashi, M. Yamada, Y. Iwashita, M. Kitaguchi, M. Hino, Z. Suzuki, T. Sanuki, T. Seki, K. Hirota, K. Ikeda, H. Sato, Y. Otake, H. Ohmori, T. Morishima, T. Shima

PHYSICA B-CONDENSED MATTER 406 巻 ( 12 ) 頁： 2424 - 2428 2011年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

We measured the neutron beam polarization of the BL05/NOP (Neutron Optics and Physics) beamline at J-PARC with an accuracy of less than 10(-3) using polarized He-3 gas as a neutron spin analyzer. Precise polarimetry of the neutron beam is necessary to understand the beamline optics as well as for the asymmetry measurements of the neutron beta decay, which are planned in this beamline. (C) 2011 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2011.01.009

Web of Science

MIEZE型スピンエコーの開発査読有り

日野正裕, 北口雅暁, 海老沢徹, 阿知波紀郎, 片桐政樹, BLEUEL Markus, 川端祐司, 及川健一, 前川藤夫, 林田洋寿, 山崎大, 瀬戸秀紀, 清水裕彦

日本原子力研究開発機構JAEA-Review(Web) ( 2011-014 ) 頁： 2.4.8 (WEB ONLY) 2011年6月

A high S/N ratio spin flip chopper system for a pulsed neutron source 査読有り

K. Taketani, T. Ebisawa, M. Hino, K. Hirota, T. Ino, M. Kitaguchi, K. Mishima, S. Muto, H. Oide, T. Oku, H. Otone, K. Sakai, T. Shima, H. M. Shimizu, S. Yamashita, T. Yoshioka

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 634 巻頁： S134 - S137 2011年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

We report a successful demonstration of a high SIN ratio spin flip chopper (SFC) system for pulsed neutron sources. The system consists of two SFCs and each SFC consists of a radio frequency (RF) flipper and Soller magnetic supermirrors. The aperture of the Soller mirror was 18 mm in width and 20 mm in height. The S/N ratio of the system was 306:1. This system is going to be installed to measure neutron lifetime precisely using the cold-neutron beam line, BL05 polarized-beam branch, at the Materials and Life Science Experimental Facility (MLF) in Japan Proton Accelerator Research Complex (J-PARC). (C) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nima.2010.06.357

Web of Science

Polarization of very cold neutron using a permanent magnet quadrupole 査読有り

Tamaki Yoshioka, Kenji Mishima, Takashi Ino, Kaoru Taketani, Suguru Muto, Takahiro Morishima, Hirohiko M. Shimizu, Takayuki Oku, Junichi Suzuki, Takenao Shinohara, Kenji Sakai, Hiromi Sato, Katsuya Hirota, Yoshie Otake, Masaaki Kitaguchi, Masahiro Hino, Yoshichika Seki, Yoshihisa Iwashita, Masako Yamada, Masahiro Ichikawa, Takanori Sugimoto, Shinsuke Kawasaki, Sachio Komamiya, Hidetoshi Otono, Yoshio Kamiya, Satoru Yamashita, Peter Geltenbort

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 634 巻頁： S17 - S20 2011年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

For the future fundamental physics experiments by using cold neutrons, we are developing a device which can measure the neutron polarization degree by accuracy significantly below 10(-3). A quadrupole magnet is one of the promising candidate to measure the neutron polarization degree by such extremely high precision. We have performed a polarization experiment by using the quadrupole magnets at the Very Cold Neutron (VCN) port of the PF-2 in the Institute Laue-Langevin (ILL). As a result, we obtained the polarization degree P with very high accuracy P=0.9994 +/- 0.0001(stat.) +/- 0.0003(syst.), which meet our requirement significantly. (C) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nima.2010.05.029

Web of Science

A transport optics for pulsed ultracold neutron sources 査読有り

H. M. Shimizu, Y. Iwashita, M. Kitaguchi, K. Mishima, T. Yoshioka

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 634 巻頁： S25 - S27 2011年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

High-density ultracold neutron (UCN) is commonly desired for the improvement of the experimental sensitivity to measure the electric dipole moment of neutrons. We discuss a method to suppress the decrease of the UCN density in transporting UCNs to the spatially separated storage volume by changing the UCN velocity synchronizing to the UCN time-of-flight. (C) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nima.2010.06.210

Web of Science

The performance of magnetic lens for focusing VCN-SANS 査読有り

M. Yamada, Y. Iwashita, T. Kanaya, M. Ichikawa, H. Tongu, S. J. Kennedy, H. M. Shimizu, K. Mishima, N. L. Yamada, K. Hirota, J. M. Carpenter, J. Lal, K. Andersen, P. Geltenbort, B. Guerard, G. Manzin, M. Hino, M. Kitaguchi, M. Bleuel

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 634 巻頁： S156 - S160 2011年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

We have developed a prototype rotating-permanent magnet sextupole lens (named rot-PMSx) for more efficient experiments with neutron beams in time of flight (ToF) mode. This lens can modulate the focusing strength over range 1.5 x 10(4)T/m(2) <= g' <= 5.9 x 10(4) T/m(2). Synchronization between the modulation and the beam pulse produces a focused beam without significant chromatic aberration. We anticipate that this lens could be utilized in focusing small angle neutron scattering (SANS) instruments for novel approach to high resolution SANS.
We carried out experiments testing the principle of this lens at the very cold neutron (VCN) beamline (PF2) at Institut Laue-Langevin (ILL), France. The focused beam image size at the detector was kept constant at the same beam size as the source (approximate to 3 mm) over a wavelength range of 30 angstrom <= lambda <= 48 angstrom in focal length of approximate to 1.14m. The flux gain was about 12 relative to a beam without focusing, and the depth of focus was quite large. These results show the good performance of this lens and the system. Thereupon we have demonstrated the performance of this test bed for high resolution focusing of VCN-SANS for a well-studied softmatter sample; a deuterium oxide solution of Pluronic F127, an (PEO)(100)(PPO)(65)(PEO)(100) tri-block copolymer in deuterium oxide. The results of the focusing experiment and the focusing VCN-SANS are presented. (C) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nima.2010.06.259

Web of Science

Longitudinal-gradient magnet for time focusing of ultra-cold neutrons 査読有り国際誌

Y. Arimoto, T. Yoshioka, H. M. Shimizu, K. Mishima, T. Ino, K. Taketani, S. Muto, M. Kitaguchi, S. Imajo, Y. Iwashita, S. Yamashita, Y. Kamiya, A. Yoshimi, K. Asahi, T. Shima, K. Sakai

2ND INTERNATIONAL WORKSHOP ON THE PHYSICS OF FUNDAMENTAL SYMMETRIES AND INTERACTIONS (PSI) 17 巻 2011年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：ELSEVIER SCIENCE BV

A gradient DC magnet is designed using 3D magnetic field analysis code. This magnet, referred to as a B-0 magnet, is one of the key elements of a time-focusing device for ultra-cold neutrons (UCNs) based on a radio frequency gradient flipper - a so-called rebuncher. The magnet generates a guide and a potential field that interacts with the magnetic moment of UCNs and its main body comprises a C-shaped yoke made from iron. A field gradient is generated by a pole arrangement that includes an anisotropic inter-pole, which causes the fringe field to be uniform in the longitudinal direction even when the pole gap distance changes. The designed magnet has the following properties: (1) a maximum B-field of 10 kGauss, decreasing to 2 kGauss at a longitudinal distance of 25 cm, with a gradient of less than 400 Gauss/cm, (2) variations in the fringe field along the y direction is less than 4% over a range of -3 cm <= y <= 3 cm at any z position in the spin-flipping region. Tracking simulations show that the B-0 magnet is capable of accepting UCNs in the velocity range 2.3 similar to 3.3 m/s.

DOI： 10.1016/j.phpro.2011.06.013

Web of Science

The novel method of focusing-sans with rotating magnetic sextupole lens and very cold neutrons

M. Yamada, Y. Iwashita, M. Ichikawa, H. Tongu, T. Kanaya, S. J. Kennedy, N. L. Yamada, H. M. Shimizu, K. Mishima, M. Hino, M. Kitaguchi, K. Hirota, P. Geltenbort, B. Guerard, G. Manzin, K. Andersen, J. Lal, J. M. Carpenter, M. Bleuel

IPAC 2010 - 1st International Particle Accelerator Conference 頁： 427 - 429 2010年12月

We are developing a high-resolution small angle neutron scattering (SANS) instrument utilizing pulsed white very cold neutrons (VCN) and modulating magnetic lens for focusing in time of flight (ToF) mode. The magnetic lens adopted new modulation method for focusing pulsed neutron beams over some wavelength range without chromatic aberration; the lens is composed of two concentric permanent magnet arrays in sextupole geometry and the rotation of outer array about fixed inner array provides sinusoidal field gradient modulation. We named this lens as rotating-Permanent Magnet Sextupole lens (rot-PMSx). We have fabricated the prototype of rot-PMSx with the bore diameter ?15 mm and the magnetic length 66 mm. The modulation range of magnetic field strength g inside the bore 1.5×104 T/m ? g ? 5.9×10 T/m2 and the repetition rate ? 25 Hz [1, 2]. We proved the focusing principle with it at PF2-VCN beam line in Institut Laue Langevin (ILL), France [3]. The focused beam image size was kept constant at the same beam size as the source (? 3 mm) over wavelength range of 30 ? ? λ ? 48 ? in focal length of ? 1.14 mm while the depth of focus was quite large. These results showed good performance of the rot-PMSx and we moved on to the demonstration of its performance as high-resolution VCN-f-SANS in this compact geometry of just 5 meters. We chose a tri-block copolymer poly(oxyeheylen-oxypropylene-oxyeheylen)(PEO100-PPO 65-PEO100) called Pluronic F127 as a sample, which has been well studied since 1990' [4]. The measureable q range of this system were 0.009 ?-1 ? q ? 0.3 ?-1 or 0.004 ?-1 q ? 0.08 ?-depending on the distances between the sample to detector 100 mm or 465 mm. The results of fitting these data to reasonable models were well consistent with one of same experiments carried out in the past. These results in two experiments are presented together.

Multilayer Neutron Interferometer with Complete Path Separation 査読有り

Yoshichika Seki, Haruhiko Funahashi, Masaaki Kitaguchi, Masahiro Hino, Yoshie Otake, Kaoru Taketani, Hirohiko M. Shimizu

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 79 巻 ( 12 ) 2010年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PHYSICAL SOC JAPAN

We have developed a new multi layer cold-neutron interferometer using a pair of beam splitting etalons (BSEs) with an air gap of 189 mu m in spacing. This is the first multilayer neutron interferometer that separates two paths from each other completely without an overlap. Clear interference fringes with a contrast of 67% have been observed using a monochromatic cold-neutron beam with a wavelength of 0.88 nm.

DOI： 10.1143/JPSJ.79.124201

Web of Science

Development of a pixel detector for ultra-cold neutrons 査読有り国際共著国際誌

Kawasaki, S., Ichikawa, G., Hino, M., Kamiya, Y., Kitaguchi, M., Komamiya, S., Sanuki, T., Sonoda, S.

Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment 615 巻 ( 1 ) 2010年

Neutron Imaging of Industrial Components and Simulation Using VCAD System

Y.Yamagata, K.Hirota, S.morita, J.Ju, Y.Ohtake, H.Ypkota, T.Sera, H.Sunaga, Y.Kawabata, M.Hino, M.Kitaguchi, M.Sugiyama

KURRI Progress Report 頁： 116 - 116 2010年

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