Faculty Profiles - SHIMIZU Hirohiko

Papers - SHIMIZU Hirohiko

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21aTC-2 Development of neutron Fresnel lens

Ino T., Adachi T., Shinohara T., Shimizu H.M., Hirota K., Muto S.

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

Spin-selective neutron optics for neutron fundamental physics

Shimizu H. M.

PROCEEDINGS OF THE 17TH INTERNATIONAL SPIN PHYSICS SYMPOSIUM Vol. 915 page： 197 - 201 2007

Study on the relation between abnormal brain protein aggregation and neuopathy-abnormal aggregation of 3-repeat-tau by oxidation stress is related to pathogenesis of Alzheimer's disease

Naito S., Ikeda S., Shimizu H., Mochizuki H., Yasuda T., Mizuno Y., Furusaka M., Suzuki J., Fujiwara S., Wada K.

Polymer Preprints, Japan Vol. 55 ( 2 ) 2006.12

THz imaging with a linear array detector based on superconducting tunnel junctions

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

IRMMW-THz 2006 - 31st International Conference on Infrared and Millimeter Waves and 14th International Conference on Terahertz Electronics 2006.12

Publisher：IRMMW-THz 2006 - 31st International Conference on Infrared and Millimeter Waves and 14th International Conference on Terahertz Electronics

We demonstrated terahertz imaging using a linear array detector with five elements based on superconducting tunnel junctions (STJs). Nondestructive imaging at 0.66 THz was successfully performed for a test metallic pattern and an integrated-circuit card using the STJ linear array, which shortened the total acquisition time. ©2006 IEEE.

DOI： 10.1109/ICIMW.2006.368603

Scopus

Applications of neutron refractive optical devices

Shimizu H.

Physica B: Condensed Matter Vol. 385-386 page： 989 - 994 2006.11

Publisher：Physica B: Condensed Matter

Refractive optics has relatively large effective apertures compared with reflective optics and they are suitable for two-dimensional beam focusing. There are two types of refractive optics, which are compound refractive optics and magnetic optics. Both of them are applied to extend the accessible q-range in small-angle scattering of cold neutron. We discuss possibilities to apply magnetic optics at pulsed neutron sources. We also discuss the possibility to obtain an extremely high neutron polarization using the spin-selectivity of magnetic optics. © 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2006.05.318

Scopus

Simulation study of neutron focusing effect on a pulsed sextupole magnetic lens using PHITS code

Mitsutake, I; Kiyanagi, Y; Kamiyama, T; Nitta, K; Suzuki, J; Oku, T; Shimizu, HM

PHYSICA B-CONDENSED MATTER Vol. 385-86 page： 1229 - 1231 2006.11

Publisher：Physica B: Condensed Matter

We have performed various simulation calculations for a pulsed sextupole magnetic lens to look for the best condition of focusing experiments, assuming conditions of the pulse magnetic lens now under construction. Here, we placed a slit between the pulsed neutron moderator and the neutron lens, in order to see the focusing effect clearly. For the simulation, we used PHITS code to know influences of the position of the slit on the intensity of focused neutron beam, the focal point, and the broadening of the focal point. Increase of the distance of the slit from the source resulted in the decrease of the peak intensity of neutron beam at the focal point. Full-width at half-maximum of the neutron distribution along the incident beam direction around the focal point, broadened with increasing the distance, and the focal distance also became longer. The intensity ratios defined by (intensity with magnetic field)/(intensity without magnetic field) also increased with decreasing the distance. Therefore, it is better to set a slit near the moderator. © 2006.

DOI： 10.1016/j.physb.2006.05.417

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Small-angle characterization of multimetric variants related to Parkinson's disease of ubiquitin carboxyl-terminal hydrolase L1 in water by small-angle neutron scattering

Naito S., Mochizuki H., Yasuda T., Mizuno Y., Furusaka M., Ikeda S., Shimizu H.M., Adachi T., Suzuki J., Fujiwara S., Okada Y., Mshikawa K., Aoki S., Wada K.

Polymer Preprints, Japan Vol. 55 ( 1 ) 2006.10

Publisher：Polymer Preprints, Japan

UCH-L1 is a neuro-specific multiple functional enzyme. To examine the relationship between PD and the configuration of UCH-L1 variants [wild-type, I93M (linked to familial PD), and SI8Y (linked to reduced risk of PD)], we examined their structures in dueterized water directly using small-angle neutron scattering. We demonstrate that these were all self-assembled dimers. The wild-type was a rotating ellipsoidal dimer although the crystal structure predicted from the UCH-L3 was globular. The globular form of the monomeric component deformed by the I93M mutation. Conversely, the SI8Y polymorphism promoted the globularity. The morphological structures of UCH-L1 variants and PD exhibit good pathological correlation.

Scopus

Design study of superconducting sextupole magnet using HTS coated conductor for neutron-focusing device

Tosaka, T; Koyanagi, K; Ono, M; Kuriyama, T; Watanabe, I; Tsuchiya, K; Suzuki, J; Adachi, T; Shimizu, HM

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS Vol. 445 ( 1-2 ) page： 1095 - 1098 2006.10

Publisher：Physica C: Superconductivity and its Applications

We performed a design study of sextupole magnet using high temperature superconducting (HTS) wires. The sextupole magnet is used as a focusing lens for neutron-focusing devices. A neutron-focusing device is desired to have a large aperture and a high magnetic field gradient of G, where G = 2B/r2, B is the magnetic field and r is a distance from the sextupole magnet axis. Superconducting magnets offer promising prospects to meet the demands of a neutron-focusing device. Recently NbTi coils of low temperature superconducting (LTS) have been developed for a sextupole magnet with a 46.8 mm aperture. The maximum magnetic field gradient G of this magnet is 9480 T/m2 at 4.2 K and 12,800 T/m2at 1.8 K. On the other hand, rapid progress on second generation HTS wire has been made in increasing the performance of critical current and in demonstrating a long length. The second generation HTS wire is referred to as coated conductor. It consists of tape-shaped base upon which a thin coating of superconductor, usually YBCO, is deposited or grown. This paper describes a design study of sextupole magnet using coated conductors. © 2006.

DOI： 10.1016/j.physc.2006.05.043

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Performance of a multi-anode photomultiplier employing a weak electrostatic focusing system (Hamamatsu R8900 series)

Kawasaki, Y; Bertaina, ME; Sakaki, N; Shimizu, HM; Inoue, N; Hasegawa, S; Ohtsu, I; Adachi, T; Ebisuzaki, T; Hirota, K; Ikeda, K; Kajino, F; Morishima, T; Nagano, M; Sato, M; Sawabe, T; Shibata, T; Shinohara, T; Takeda, M; Takizawa, Y; Uchihori, Y; Wada, Y

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 564 ( 1 ) page： 378 - 394 2006.8

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

We have developed and tested a new type of multi-anode photomultiplier: Hamamatsu R8900-03 series. The main feature of the R8900-03 series is a highly sensitive surface: ∼ 83 % of the physical area. In this paper we report on the results of measurements we performed to check several parameters of this new type of photomultiplier. R8900-03 photomultipliers are devices suitable for experiments where large collection area and uniform detection efficiency are essential characteristics. © 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nima.2006.03.010

Web of Science

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Low Energy Neutron Optics

SHIMIZU Hirohiko M.

Journal of the Particle Accelerator Society of Japan Vol. 3 ( 2 ) page： 128 - 136 2006.7

Language：Japanese Publisher：Particle Accelerator Society of Japan

<p>Neutron is a unique probe to study materials according to its low capability to excite chemical bondings with a relatively high sensitivity to light elements. However, its low luminosity has limited the application fields. The recent innovations in neutron optics have been activating enhanced analyzing capabilities of neutron scattering experiments. We describe the current status of advanced neutron optics and possible extensions of their applications.</p>

DOI： 10.50868/pasj.3.2_128

CiNii Research

Nb<sub>3</sub>Sn sextupole magnet for neutron beam focusing

Okamoto, K; Nakamura, K; Seki, Y; Ohno, M; Takao, T; Mitsuda, C; Ohuchi, N; Shintomi, T; Tsuchiya, K; Adachi, T; Shimizu, H; Oku, T; Suzuki, J; Kimura, S; Hanai, S; Urata, M; Watanabe, I

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY Vol. 16 ( 2 ) page： 362 - 365 2006.6

Publisher：IEEE Transactions on Applied Superconductivity

In order to obtain a high-intensity neutron beam for neutron scattering experiments, strong sextupole magnets with large apertures are useful as a focusing element. We have started the development of a Nb3Sn sextupole magnet for this purpose. The design field strength of the sextupole is 12780 T/m2 and the aperture of the coil is 46 mm in diameter. As a first step of the development, three model coils have been made in order to learn about Nb3Sn technology and to evaluate the fabrication techniques. Single-pole tests of these coils have been performed to assess the conductor stability and training behavior of the Nb3Sn coils. This paper describes the design of the magnet, the fabrication of the model coils and the results of single-pole tests. © 2006 IEEE.

DOI： 10.1109/TASC.2006.873329

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Terahertz imaging with a direct detector based on superconducting tunnel junctions

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

APPLIED PHYSICS LETTERS Vol. 88 ( 20 ) 2006.5

Publisher：Applied Physics Letters

We demonstrated terahertz imaging using a direct detector based on niobium superconducting tunnel junctions (STJs). The detector is composed of linearly distributed junctions placed on a superconducting microstrip line and is integrated on two wings of a log-periodic antenna. We succeeded nondestructive imaging for an integrated-circuit card and dry material using the detector around its sensitivity peak (∼0.66 THz). The dynamic range was measured to be higher than 4× 107 (76 dB). Thus, the STJ detector is applicable to high-sensitivity and high-speed terahertz imaging for various nondestructive inspection applications. © 2006 American Institute of Physics.

DOI： 10.1063/1.2204842

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A broadband terahertz detector using a superconducting tunnel junction

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

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 559 ( 2 ) page： 751 - 753 2006.4

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

We have proposed and demonstrated a new broadband terahertz (THz) wave detector using a superconducting tunnel junction (STJ) fabricated on LiNbO3, LiTaO3, and sapphire substrates. These substrates have relatively high absorption efficiency for THz waves, and we have expected that incident THz waves from substrate side are absorbed and that generate many THz phonons which break Cooper pairs in the base superconductor electrode of the STJ. Using a frequency-tunable THz pulse source in 1-2 THz, we have confirmed that the current signal corresponding to the THz input was observed. In addition, we found two current components with different timescales for the first time. We interpret that the slow component corresponds to phonons absorbed with the substrate and that the fast one corresponds to the directly absorbed photons with the superconductor electrode of the STJs. © 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nima.2005.12.207

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Scopus

Detection of α particles with a superconducting series-junction detector

Kurakado, M; Kirk, EC; Sato, H; Jerjen, I; Shiki, S; Shimizu, HM; Zehnder, A; Taniguchi, K

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 559 ( 2 ) page： 480 - 482 2006.4

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

Alpha particles were measured with a superconducting series-junction detector. The effective area and thickness of the detector are given by a circle of 0.5 mm in diameter and 500 μm Al2O3, respectively. The risetime of the charge-sensitive preamplifiers, i.e. charge collection time of the detector, was about 5 μs. An energy resolution of 0.35% was obtained for 5.5 MeV α particles. © 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nima.2005.12.080

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Development of a low energy particle detector using a superconducting transition edge sensor

Ohno, M; Sato, H; Ikeda, T; Shimizu, HM

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 559 ( 2 ) page： 573 - 575 2006.4

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

It is possible for a superconductive transition edge sensor (TES) to detect directly the low energy proton generated in the neutron beta decay. The precision measurement of the proton spectrum is important to test the prediction of the Standard Model of electroweak interaction. Therefore, we are developing a TES microcalorimeter with a large effective area for a proton detector. Our first TES device consists of four-pixels using a Ti/Au bilayer. All pixels are parallel biased and X-rays from a 55Fe source are detected successfully. © 2005 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nima.2005.12.058

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Refraction as a means of encoding wavelength for neutron reflectometry

Cubitt, R; Shimizu, HM; Ikeda, K; Torikai, N

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 558 ( 2 ) page： 547 - 550 2006.3

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

Neutron reflectometry is a well-established technique used to analyze the structure of interfaces as a function of depth normal to the surface. On a continuous source of neutrons, such as a reactor, the measurement can be done at a fixed incident angle and a white beam with the neutron wavelength encoded by the use of choppers to measure the time of flight. Although providing a certain flexibility in wavelength resolution, choppers have low transmission. This paper explores the possibility of using refraction to encode neutron wavelength opening the possibility of reactor sources to use almost the full-time-averaged neutron flux available and hence, increase the performance of neutron reflectometers by orders of magnitude. © 2005 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nima.2005.12.045

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Scopus

Characterization of multimetric variants of ubiquitin carboxyl-terminal hydrolase L1 in water by small-angle neutron scattering

Naito, S; Mochizuki, H; Yasuda, T; Mizuno, Y; Furusaka, M; Ikeda, S; Adachi, T; Shimizu, HM; Suzuki, J; Fujiwara, S; Okada, T; Nishikawa, K; Aoki, S; Wada, K

BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS Vol. 339 ( 2 ) page： 717 - 725 2006.1

Publisher：Biochemical and Biophysical Research Communications

Here, we illustrated that the morphological structures of ubiquitin carboxyl-terminal hydrolase L1 (UCH-L1) variants and Parkinson's disease (PD) exhibit good pathological correlation by a small-angle neutron scattering (SANS). UCH-L1 is a neuro-specific multiple functional enzyme, deubiquitinating, ubiquityl ligase, and also involved in stabilization of mono-ubiquitin. To examine the relationship between multiple functions of UCH-L1 and the configuration of its variants [wild-type, I93M (linked to familial Parkinson's disease), and S18Y (linked to reduced risk of Parkinson's disease)], in this report, we proposed that these were all self-assembled dimers by an application of a rotating ellipsoidal model; the configurations of these dimers were quite different. The wild-type was a rotating ellipsoidal. The globular form of the monomeric component deformed by the I93M mutation. Conversely, the S18Y polymorphism promoted the globularity. Thus, the multiple functional balance is closely linked to the intermolecular interactions between the UCH-L1 monomer and the final dimeric configuration. © 2005 Elsevier Inc. All rights reserved.

DOI： 10.1016/j.bbrc.2005.11.066

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PubMed

development of gadorinium system thin scintillator(3)

YAMAGUCHI Toru, HARUNA Jun, KANEKO Junichi, SUSA Kenzou, MIURA Seiji, YAGI Yasuhiro, KAWAMURA Souhan, OKU Takayuki, FUJITA Fumiyuki, HOMMA Akira, ISHIBASHI Hiroyuki, SAWAMURA Teruko, FURUSAKA Michihiro, SHIMIZU Hirohiko, KIYANAGI Yoshiaki

Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan Vol. 2006s ( 0 ) page： 64 - 64 2006

20aSF-4 Highly polarized neutron beam produced by a quadrupole magnet and its application to fundamental physics

Yamada S., Oku T., Mishima K., Sato H., Hirota K., Morishima T., Ohno M., Shinohara T., Suzuki J., Shimizu H.M.

Meeting Abstracts of the Physical Society of Japan Vol. 61.2.1 ( 0 ) page： 29 2006

development of gadorinium system thin scintillator (2)

TSUCHIDA Syouhei, HARUNA Jun, KANEKO Junichi, SUSA Kenzou, MIURA Seiji, OKU Takayuki, FUJITA Fumiyuki, HOMMA Akira, SAWAMURA Teruko, FURUSAKA Michihiro, SHIMIZU Hirohiko, KIYANAGI Yoshiaki

Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan Vol. 2006s ( 0 ) page： 65 - 65 2006

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Papers - SHIMIZU Hirohiko