Faculty Profiles - SHIMIZU Hirohiko

Papers - SHIMIZU Hirohiko

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Terahertz electromagnetic-wave detector using Nb-based superconducting tunnel junction on LiNbO<sub>3</sub> substrate absorber

Taino, T; Ishii, H; Yoshimura, S; Otani, C; Ariyoshi, S; Myoren, H; Kawase, K; Shibuya, T; Sato, H; Shimizu, HM; Takada, S

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS Vol. 463 ( SUPPL. ) page： 1119 - 1122 2007.10

Publisher：Physica C: Superconductivity and its Applications

We have been developing terahertz (THz) wave detectors using superconducting tunnel junctions (STJs). The STJs consist of the Nb/Al/AlOx/Al/Nb structure. We fabricated THz-wave detectors on LiNbO3 substrates that have a high absorption coefficient for the frequency range of 1012 Hz. Two kinds of signals were detected when the THz-wave was irradiated from the substrate side. One was an indirect signal related to the generation of phonons. The other was a signal that corresponds to directly generated quasi-particles in the Nb electrode of the STJ. The pulse height of the indirect signal was larger than that of the latter signal. To enlarge the detector area, we designed a STJ that has different areas of the base electrode and top electrode. In this paper, the characteristics of the THz-wave detector area will be discussed. © 2007 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physc.2007.03.500

Web of Science

Scopus

Development of neutron interferometer with wide-gapped "bSE"s for precision measurements

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

AIP Conference Proceedings Vol. 915 page： 202 - 205 2007.9

Publisher：AIP Conference Proceedings

We are developing large-dimensional cold-neutron interferometers with multilayer mirrors in order to investigate small interactions. In particular Jamin type interferometers composed of wide-gapped "BSE"s, which divide the beam completely, can realize the precision measurement of topological Aharonov-Casher effect. We have made a prototype with 200 μm gapped BSEs and confirmed the spatial separation of its two paths at monochromatic cold-neutron beamline MINE2 on JRR-3M reactor in JAEA. © 2007 American Institute of Physics.

DOI： 10.1063/1.2750763

Scopus

Spin-selective neutron optics for neutron fundamental physics

Shimizu H.

AIP Conference Proceedings Vol. 915 page： 197 - 201 2007.9

Development of micro pattern gas detectors in the University of Tokyo

FUJITA Kaoru, TAKAHASHI Hiroyuki, NIKO Hisako, TAKADA Yuka, INO Takashi, SHIMIZU Hirohiko M, KISHIMOTO Shunji, OKU Takayuki, SUZUKI Jun-ichi, FURUSAKA Michihiro, KANAZAWA Masakazu

Vol. 2007 ( 1 ) page： 1 - 4 2007.9

CS-7-9 Single Photon Detector using Superconducting Tunnel Junction at 1.5-micron Waveband

Shiki Shigetomo, Sato Hiromi, Shimizu Hirohiko M.

Proceedings of the IEICE General Conference Vol. 2007 ( 2 ) page： "S - 31"-"S-32" 2007.3

X-Ray Detection Using Superconducting Tunnel Junction Shaped Normal-Distribution-Function

TAINO Tohru, NISHIHARA Tomohiro, HOSHINO Koichi, MYOREN Hiroaki, SATO Hiromi, SHIMIZU Hirohiko M., TAKADA Susumu

IEICE transactions on electronics Vol. 90 ( 3 ) page： 566 - 569 2007.3

Language：English Publisher：The Institute of Electronics, Information and Communication Engineers

A normal-distribution-function-shaped superconducting tunnel junction (NDF-STJ) which consists of Nb/Al-AlO_x/Al/Nb has been fabricated as an X-ray detector. Current-voltage characteristics were measured at 0.4K using three kinds of STJs, which have the dispersion parameters σ of 0.25, 0.45 and 0.75. These STJs showed very low subgap leakage current of about 5nA. By irradiating with 5.9keV X-rays, we obtained the spectrum of these NDF-STJs. They showed good energy resolution with small magnetic fields of below 3mT, which is about one-tenth of those for conventional-shaped STJs.

CiNii Research

Neutron diffraction under 30T pulsed magnetic fields

Ohoyama, K; Katoh, N; Nojiri, H; Matsuda, YH; Hiraka, H; Ikeda, K; Shimizu, HM

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS Vol. 310 ( 2 ) page： E974 - E976 2007.3

Publisher：Journal of Magnetism and Magnetic Materials

We develop techniques for neutron diffraction experiments under pulsed high magnetic fields. 30 T pulsed magnetic fields were successfully generated on a neutron spectrometer installed at a reactor. Neutron beam focusing devices and high efficiency neutron detecting system have also been developed. © 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jmmm.2006.10.958

Web of Science

Scopus

Simulation of focusing using a pulsed sextupole electromagnet and comparison with experimental results

Iwashita Hidenori, Iwasa Hirokatsu, Hiraga Hujio, Kamiyama Takashi, Kiyanagi Yoshiaki, Suzuki Jyunichi, Shinohara Takenao, Oku Takayuki, Simizu Hirohiko

Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan Vol. 2007f ( 0 ) page： 182 - 182 2007

Characteristics of MS-tube as a position sensitive neutron detector

Fujita Kaoru, Takahashi Hiroyuki, Niko Hisako, Nishi Kosuke, Takada Yuka, Furusaka Michihiro, Ino Takashi, Shimizu Hirohiko, Kishimoto Shunji, Oku Takayuki, Suzuki Jun-ichi, Toyokawa Hidenori, Kanazawa Masakazu

Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan Vol. 2007s ( 0 ) page： 72 - 72 2007

Evaluation of position resolution with charge division method by cathode patterning in MSGC

Fujita Kaoru, Takahashi Hiroyuki, Niko Hisako, Takada Yuka, Ino Takashi, Shimizu Hirohiko, Kishimoto Shunji, Furusaka Michihiro, Kanazawa Masakazu

Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan Vol. 2007f ( 0 ) page： 106 - 106 2007

Development of neutron interferometer with wide-gapped "BSE"s for precision measurements

Seki, Y; Kitaguchi, M; Funahashi, H; Taketani, K; Hino, M; Otake, Y; Shimizu, HM

PROCEEDINGS OF THE 17TH INTERNATIONAL SPIN PHYSICS SYMPOSIUM Vol. 915 page： 202 - + 2007

19aXB-9 Development of Curved Supermirrors for Neutron Optical devices

Ikeda K., Hirota K., Sato H., Ohmori H., Shimizu H. M., Furusaka M.

Meeting Abstracts of the Physical Society of Japan Vol. 62.1.4 ( 0 ) page： 949 2007

19aXB-8 Focusing of pulsed polychromatic neutron beam by a compound sextupole magnet

Suzuki J., Oku T., Shinohara T., Shimizu H. M., Pynn Roger

Meeting Abstracts of the Physical Society of Japan Vol. 62.1.4 ( 0 ) page： 949 2007

19aXB-7 Neutron beam focusing by a pulsed sextupole electromagnet

Shinohara T., Iwashita H., Suzuki J., Oku T., Kamiyama T., Iwasa H., Hiraga F., Kiyanagi Y., Sato K., Shimizu H. M.

Meeting Abstracts of the Physical Society of Japan Vol. 62.1.4 ( 0 ) page： 949 2007

19aXB-6 Development of magnetic lenses for neutron beam focus and polarization (2)

Ino T., Iwashita Y., Oku T., Kaneko N., Kawai M., Kobayashi Y., Sagehashi H., Shinohara T., Shimizu H. M., Suzuki J., Tahara T., Hirota K., Muto S., Morishima T.

Meeting Abstracts of the Physical Society of Japan Vol. 62.1.4 ( 0 ) page： 949 2007

19aXB-5 Development of magnetic lenses for neutron beam focus and polarization (1)

Ino T., Iwashita Y., Oku T., Kaneko N., Kawai M., Kobayashi Y., Sagehashi H., Shinohara T., Shimizu H. M., Suzuki J., Tahara T., Hirota K., Muto S., Morishima T.

Meeting Abstracts of the Physical Society of Japan Vol. 62.1.4 ( 0 ) page： 948 2007

21aTC-1 Development of magnetic lenses for neutron beam focus and polarization (3)

Muto S., Ino T., Iwashita Y., Oku T., Kaneko N., Kawai M., Kobayashi Y., Sagehashi H., Shinohara T., Shimizu H.M., Suzuki J., Tahara T., Hirota K., Morishima T.

Meeting Abstracts of the Physical Society of Japan Vol. 62.2.4 ( 0 ) page： 970 2007

24aZG-2 Mesurement of magnetic field in adjustable Parmanent Magnet Multipole

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

Meeting Abstracts of the Physical Society of Japan Vol. 62.2.1 ( 0 ) page： 133 2007

21pRE-13 Measurement of stopping power variation of thin metallic target for α-ray in strong magnetic field

Itoh Hiroyuki, Mitsuda Chikaori, Morita Akio, Ichikawa Masahiro, Tajima Yujiro, Shimizu Hirohiko, Yoshimura Koji, Tosaki Mitsuo, Iwashita Yoshihisa

Meeting Abstracts of the Physical Society of Japan Vol. 62.2.2 ( 0 ) page： 156 2007

21aTC-3 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 H.M.

Meeting Abstracts of the Physical Society of Japan Vol. 62.2.4 ( 0 ) page： 970 2007

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Papers - SHIMIZU Hirohiko