Faculty Profiles - SHIMIZU Hirohiko

Papers - SHIMIZU Hirohiko

Division display 301 - 320 of about 475 ／ All the affair displays >>

Terahertz imaging with a two-dimensional array detector based on superconducting tunnel junctions

Ariyoshi S., Otani C., Dobroiu A., Sato H., Taino T., Matsuo H., Shimizu H.M.

33rd International Conference on Infrared and Millimeter Waves and the 16th International Conference on Terahertz Electronics, 2008, IRMMW-THz 2008 2008.12

Publisher：33rd International Conference on Infrared and Millimeter Waves and the 16th International Conference on Terahertz Electronics, 2008, IRMMW-THz 2008

We demonstrated terahertz imaging using a two-dimensional array detector with 5x5 elements based on superconducting tunnel junctions. Real-time 25-pixel imaging at 0.65 THz was successfully performed. The array detector also allowed the shortening of the total acquisition time for larger images, made up of pixel blocks. ©IEEE.

DOI： 10.1109/ICIMW.2008.4665736

Scopus

2D elemental analysis approach in focused neutron beam induced prompt gamma-ray analysis at JAEA

Segawa M., Matsue H., Sekiya Y., Yamada S., Shinohara T., Oku T., Sasao H., Suzuki J., Shimizu H.M.

Journal of Radioanalytical and Nuclear Chemistry Vol. 278 ( 3 ) page： 647 - 651 2008.12

Publisher：Journal of Radioanalytical and Nuclear Chemistry

We have constructed a new system which could analyze a position distribution of several elements in a sample with 2 dimensional prompt γ-ray analysis (2D PGA) system using focused neutron beam at JAEA. We aimed that the system could analyze local information in a sample with a good signal γ-ray from interested elements to noise of background γ-ray ratio. As a result, this system could determine the position resolution and spatial resolution within 1 mm. © 2008 Springer Science+Business Media, LLC.

DOI： 10.1007/s10967-008-1402-3

Scopus

Strong variable permanent multipole magnets

Iwashita, Y; Ichikawa, M; Tajima, Y; Nakamura, S; Kumada, M; Spencer, CM; Tauchi, T; Kuroda, S; Okugi, T; Ino, T; Muto, S; Shimizu, HM

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY Vol. 18 ( 2 ) page： 957 - 960 2008.6

Publisher：IEEE Transactions on Applied Superconductivity

Three super strong permanent multipole magnets have been made: a fixed strength quadrupole, a variable quadrupole and a variable sextupole. The inner and outer diameters of the first 100 mm-length quadrupole are 14 mm and 100 mm, respectively. This fixed strength quad has an integrated gradient of 28.5 T; where the gradient at the center is more than 2.9 T/cm. The second, variable, quadrupole has an integrated strength of 38 T with 15 mm inner diameter and 230 mm length at the maximum: there are sixteen positions in its variable strength with about a 2 T even step width. The sextupole model is intended to change its strength at 25 Hz. One application of a variable quadrupole magnet is a final doublet quadrupole for an e+e- linear collider. Permanent magnet sextupoles are useful for focusing of cold neutrons, which are a very useful probe for material research. Strong octupoles for beam tail folding in the final focus beamline of a linear collider will also be possible with permanent magnets. These high order multipoles made from permanent magnets can achieve higher strengths, for a given bore radius, than superconducting ones. Design works are presented starting from brief review. © 2008 IEEE.

DOI： 10.1109/TASC.2008.921302

Web of Science

Scopus

Development of terahertz-wave detector array based on superconducting tunnel junctions and its imaging applications

ARIYOSHI Seiichiro, OTANI Chiko, DOBROIU Adrian, SATO Hiromi, TAINO Tohru, MATSUO Hiroshi, SHIMIZU Hirohiko

Vol. 78 page： 62 2008.5

Application of a neutron-polarizing device based on a quadrupole magnet to a focusing SANS instrument with a magnetic neutron lens

Oku, T; Shinohara, T; Kikuchi, T; Oba, Y; Iwase, H; Koizumi, S; Suzuki, J; Shimizu, HM

MEASUREMENT SCIENCE AND TECHNOLOGY Vol. 19 ( 3 ) 2008.3

Publisher：Measurement Science and Technology

A magnetic neutron lens based on a sextupole magnet is considered an ideal neutron-focusing device for focusing-geometry small-angle neutron scattering (FSANS) instruments using polarized neutrons. However, the magnetic neutron lens functions both as focusing and defocusing lens for positive and negative polarity neutrons, respectively. Negative polarity neutrons are defocused by the lens and spread over the detector of the instrument, resulting in an increase of the background level. Therefore, a neutron-polarizing device with a very high polarizing efficiency P ≳ 0.99 is required to be employed together with the magnetic neutron lens. A neutron-polarizing device based on a quadrupole magnet has a very high polarizing efficiency P ≳ 0.99, which is sufficient for the application to the FSANS instrument. In this study, we installed the quadrupole magnet in the FSANS instrument SANS-J-II and investigated its performance with respect to the conventional magnetic super-mirror polarizers of the FSANS instrument. © 2008 IOP Publishing Ltd.

DOI： 10.1088/0957-0233/19/3/034011

Web of Science

Scopus

Variable permanent magnet sextupole lens for focusing of pulsed cold neutrons

Iwashita, Y; Tajima, Y; Ichikawa, M; Nakamura, S; Ino, T; Muto, S; Shimizu, HM

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 586 ( 1 ) page： 73 - 76 2008.2

Publisher：Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

A Variable Permanent Magnet Sextupole (VPMS) lens that can focus pulsed slow neutrons is under development. It is based on the extended Halbach configuration to generate stronger magnetic field. In order to adjust the strength, the magnet is divided into two nested rings, where the inner ring is fixed and the outer ring can be rotated. This device will focus cold neutrons with wavelength of a few to several Angstroms at about 10 m focal length. We fabricated a half-scale model to measure the strength and the torque as functions of the rotor angle. Because the torque is measured as high as more than 30 N m, a mechanism to rotate the rotor is carefully designed. After installation of such a mechanism, a motor will drive the rotor and the temperature rise caused from eddy current loss will be measured. Detailed development of the system will be presented. © 2007 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nima.2007.11.058

Web of Science

Scopus

The JEM-EUSO project: Observing extremely high energy cosmic rays and neutrinos from the international space station

Ebisuzaki, T; Uehara, Y; Ohmori, H; Kawai, K; Kawasaki, Y; Sato, M; Takizawa, Y; Bertaina, ME; Kajino, F; Sawabe, T; Inoue, K; Sasaki, A; Sakata, M; Yamamoto, Y; Nagano, M; Inoue, N; Shibata, T; Sakaki, N; Uchihori, Y; Takahashi, Y; Shimizu, H; Arai, Y; Kurihara, Y; Fujimoto, H; Yoshida, S; Mizumoto, Y; Inoue, S; Asano, K; Sugiyama, T; Watanabe, J; Ikeda, H; Suzuki, M; Imamura, T; Yano, H; Murakami, T; Yonetoku, D; Itow, Y; Taguchi, M; Nagata, M; Nagataki, S; Abe, S; Tajima, T; Adams, JH; Mitchell, S; Christl, MJ; Watts, J; English, A; Takahashi, Y; Pitalo, K; Hadaway, J; Geary, J; Readon, P; Crawford, H; Pennypacker, C; Arisaka, K; Cline, D; Gorodetsky, P; Salin, P; Patzark, T; Maurissen, A; Valentin, M

NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS Vol. 175 ( SUPPL.: COMPLETE ) page： 237 - 240 2008.1

Development of MSGC for neutron application with micron-order blasting technology

Fujita Kaoru, Takahashi Hiroyuki, Ino Takashi, Shimizu Hirohiko, Kishimoto Shunji, Furusaka Michihiro, Oku Takayuki, Suzuki Jun-ichi

Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan Vol. 2008f ( 0 ) page： 131 - 131 2008

Neutron Optics and Physics Beamline (J-PARC BL05)

Shimizu Hirohiko M.

hamon Vol. 18 ( 3 ) page： 151 - 154 2008

Publisher：The Japanese Society for Neutron Science

A pulsed cold neutron beam for the study of neutron optics and fundamental physics (NOP) is under construction as the BL05 of the spallation neutron source of the J-PARC. The NOP beamline has three beam branches, which provide the highly-polarized beam, high intensity beam and low divergence beam for the neutron decay experiment, the neutron scattering experiment and the neutron interferometry experiment, respectively. We overview the physics to be studied at the NOP beamline at its beginning stage.

DOI： 10.5611/hamon.18.151

CiNii Research

Terahertz Imaging with a Two-dimensional Array Detector Based on Superconducting Tunnel Junctions

Ariyoshi, S; Otani, C; Dobroiu, A; Sato, H; Taino, T; Matsuo, H; Shimizu, HM

2008 33RD INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER AND TERAHERTZ WAVES, VOLS 1 AND 2 page： 618 - 618 2008

23aSJ-10 Observation of quantum states of Ultra-Cold Neutrons in the Gravitational Field : Estimation of the Performance of the Detector by Cold Neutrons

Ichikawa Go, Kawasaki Shinsuke, Komamiya Sachio, Kamiya Yoshio, Sanuki Tomoyuki, Shimizu Hirohiko M., Hino Masahiro, Kitaguchi Masaaki

Meeting Abstracts of the Physical Society of Japan Vol. 63.2.1 ( 0 ) page： 22 2008

26pZL-2 Development of Modulating Permanent Magnet Sextupole for Focusing of pulsed cold neutrons

Yamada Masako, Ichikawa Masahiro, Iwashita Yoshihisa, Tajima Yujiro, Tongu Hiromu, Ino Takashi, Shimizu Hirohiko M, Muto Suguru

Meeting Abstracts of the Physical Society of Japan Vol. 63.1.1 ( 0 ) page： 131 2008

24pWG-11 Development and application of multiple sextupole magnet for focusing of polychromatic neutron beam

Suzuki Jun-ichi, Oku Takayuki, Shinohara Takenao, Ohba Yojiro, Kikuchi Takayuki, Shimizu Hirohiko M., Pynn Roger

Meeting Abstracts of the Physical Society of Japan Vol. 63.1.4 ( 0 ) page： 931 2008

24pWG-10 Developments for 2-3 Dimensional Prompt Gamma-ray Analysis System at JAEA

Segawa M., Matsue H., Yamada S., Shinohara T., Oku T., Sasao H., Suzuki J., Shimizu H.

Meeting Abstracts of the Physical Society of Japan Vol. 63.1.4 ( 0 ) page： 931 2008

23pSM-6 Development of Modulating Permanent Magnet Sextupole for Focusing of pulsed cold neutrons II

Yamada M., Iwashita Y., Ichikawa M., Sugimoto T., Tongu H., Fujisawa H., Shimizu H.M., Ino T., Mishima K., Taketani K., Yoshioka T., Mutou S., Morishima T., Oku T., Suzuki J., Shinohara T., Sakai K., Sato H., Hirota K., Otake Y., Seki Y., Kawasaki S., Komamiya S., Kamiya Y., Otono H., Yamashita S.

Meeting Abstracts of the Physical Society of Japan Vol. 63.2.1 ( 0 ) page： 24 2008

23pSM-5 Development of Very Cold Neutron Interferometer

Seki Yoshichika

Meeting Abstracts of the Physical Society of Japan Vol. 63.2.1 ( 0 ) page： 24 2008

23pSM-2 Neutron interferometer at J-PARC

Kitaguchi Masaaki, Hino Masahiro, Seki Yoshichika, Funahashi Haruhiko, Mishima Kenji, Ino Takashi, Taketani Kaoru, Yoshioka Tamaki, Muto Suguru, Morishima Takahiro, Shimizu Hirohiko M., Shima Tatsushi, Sato Hiromi, Hirota Katsuya, Otake Yoshie, Sakai Kenji, NOP Collaboration

Meeting Abstracts of the Physical Society of Japan Vol. 63.2.1 ( 0 ) page： 23 2008

23aSJ-9 Observation of quantum states of Ultra-Cold Neutrons in the Gravitational Field : Report on a performance test of pixel detector for Ultra-Cold Neutrons at ILL

Kawasaki Shinsuke, Ichikawa Go, Komamiya Sachio, Kamiya Yoshio, Sanuki Tomoyuki, Shimizu Hirohiko M., Hino Masahiro, Kitaguchi Masaaki

Meeting Abstracts of the Physical Society of Japan Vol. 63.2.1 ( 0 ) page： 22 2008

Research and Development of Neutron Detectors, Neutron Optical Devices and Data Acquisition at J-PARC

SOYAMA Kazuhiko, SHIMIZU Hirohiko, OTOMO Toshiya

Nihon Kessho Gakkaishi Vol. 50 ( 1 ) page： 66 - 71 2008

Language：Japanese Publisher：The Crystallographic Society of Japan

Advanced neutron instrumentations are key to accelerated progress of high intense pulsed neutron research at J-PARC, SNS and ISIS-TS2. Current status of development of scintillating and gaseous neutron detectors, application of neutron reflective and magnetic optics, and soft ware development for large amount data acquisition at J-PARC, are described.

DOI： 10.5940/jcrsj.50.66

CiNii Research

Development of permanent mangnet sextupole lens for focusing of cold neutrons

Yamada M., Iwashita Y., Ichikawa M., Tongu H., Shimizu H., Ino T., Muto S.

EPAC 2008 - Contributions to the Proceedings page： 2392 - 2394 2008

Publisher：EPAC 2008 - Contributions to the Proceedings

A modulating permanent magnet sextupole lens that can focus pulsed cold neutrons is under development. The magnet is based on the extended Halbach configuration to generate stronger magnetic field. In order to adjust the strength, the magnet is divided into two co-axial nested rings, where the inner ring is fixed and the outer ring can be rotated. Synchronizing the period of the modulation with that of pulsed neutron beam suppress the chromatic aberration. We have fabricated a half scale model as a prototype and studied the strength, the temperature rise caused by eddy current. We have reduced the temperature rise about half of the former model by making the poles laminated structure. We are considering further improvement of the temperature rise and the system of rotating the outer ring with energy loss minimum. We are also measuring the very-cold neutrons focused by the half scale model.

Scopus

　 PREV - NEXT 　

<SHIMIZU Hirohiko>

Papers - SHIMIZU Hirohiko