研究者詳細 - 清水　裕彦

論文 - 清水　裕彦

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Moire fringes of cold neutron with large divergence angle 査読有り

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

PHYSICA B-CONDENSED MATTER 385-86 巻頁： 1222 - 1224 2006年11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：Physica B Condensed Matter

Moiré fringes were observed as a bright and high-contrast image using a neutron spin interferometer with a relatively divergent cold neutron beam at the MINE2 beam line of JRR-3M. The two spin states were selectively deflected with the relative angle in the range of 92-184 nrad on transmission through the magnetic field gradient in the range of 3.2-6.4 G/cm produced by a 5 cm long quadrupole electromagnet. We analyzed the result with a first-order calculation taking into account the finite beam divergence and found that the beam divergence is required to be less than the angular separation of individual Moiré loci, for the observation of Moiré fringes, and is not required to be less than the angular separation of the two beam paths. © 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2006.05.412

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Development of a multichannel parabolic guide for thermal neutron beam focusing 査読有り

Yamada, S; Shinohara, T; Sasao, H; Oku, T; Suzuki, JI; Matsue, H; Shimizu, HM

PHYSICA B-CONDENSED MATTER 385-86 巻頁： 1243 - 1246 2006年11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：Physica B Condensed Matter

We have developed a multichannel parabolic guide for thermal neutron beam focusing. The guide was designed with multichannel structure, seven channels in the present case, to focus a neutron beam with wide cross section effectively. The multichannel structure is made with parabolically bent NiC/Ti supermirrors with critical reflection angles m = 3.0 and 3.6 times as much as that of nickel and thickness of 0.55 mm. The guide consists of two focusing devices with each length of 900 mm, which are separated by a gap of 150 mm for neutron beta decay experiments. The focal length of the guide is 995 mm away from the exit of the guide. The cross section of the guide is 90 × 20 mm2 at the entrance and 52.3 × 12.1 mm2 at the exit. The guide was installed at a thermal neutron beam line for neutron-induced prompt gamma-ray analysis (PGA) of JRR-3M in JAEA with straight supermirror guides with m = 3.0. Focusing properties of the parabolic guide were measured at the focal point with a CCD imaging system and we obtained a gain of 9.6 and 4.1 in peak flux compared with those in cases of using the vacuum tube and the straight guide, respectively. The parabolic guide has been successfully used to enhance the efficacy of PGA and have also applied to neutron beta decay experiments. © 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2006.05.420

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Development of measurement system of neutron β decay 査読有り

Mishima, K; Yamada, S; Sato, H; Hirota, K; Shinohara, T; Morishima, T; Suzuki, JI; Oku, T; Shimizu, HM

PHYSICA B-CONDENSED MATTER 385-86 巻頁： 1219 - 1221 2006年11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：Physica B Condensed Matter

Precise measurement of neutron β decay allows determining the coupling constant of weak interaction independent of any nuclear structure. We have developed measurement system of neutron β decay at a thermal neutron beamline in JRR-3, JAEA. By using coincidence technique of two kinds of detectors, we have succeeded in detecting the signal of neutron β decay with S/N of 0.63 and count rate of 0.40 cps. © 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2006.05.414

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Development of neutron Anger-camera detector based on flatpanel PMT 査読有り

Hirota, K; Satoh, S; Sakai, K; Shinohara, T; Ikeda, K; Mishima, K; Yamada, S; Oku, T; Suzuki, J; Furusaka, M; Shimizu, HM

PHYSICA B-CONDENSED MATTER 385-86 巻頁： 1297 - 1299 2006年11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：Physica B Condensed Matter

A neutron scintillating detector and its data taking system have been developed for neutron scattering measurement. A 64-channel flatpanel photomultiplier is used for the Anger-camera method. The detection efficiency of γ-ray background is very low in the use of the ZnS/6LiF scintillator. The spatial resolution is less than 1 mm. The effective area of this detector is around 25 cm2, and it is easy to expand it to a larger area with small dead space using the multi-photomultiplier tubes system. The fast DAQ system has 10-bit 100 MHz flash ADCs, FPGA chips and USB2.0 device. © 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2006.06.058

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A magnetic neutron lens based on an extended Halbach-type permanent sextupole magnet 査読有り

Oku, T; Yamada, S; Sasao, H; Suzuki, JI; Shinohara, T; Hirota, K; Ikeda, K; Tsuzaki, T; Kiyanagi, Y; Furusaka, M; Shimizu, HM

PHYSICA B-CONDENSED MATTER 385-86 巻頁： 1225 - 1228 2006年11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：Physica B Condensed Matter

We have developed a magnetic neutron lens (MNL) based on an extended Halbach-type permanent sextupole magnet. The effective aperture size is 30 mm in diameter and the length is 2400 mm. The sextupole magnetic field distribution |B|=(G/2) r2 with the gradient coefficient G=10,660±530 T/m2 are generated inside the magnet, where r is the distance from the magnet center axis. The neutron-focusing property is investigated by using pulsed polarized neutrons. The obtained results are discussed in comparison with numerical simulation results. The application to the focusing-geometry small-angle neutron scattering experiments is discussed. © 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2006.05.416

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Focusing and polarized neutron ultra-small-angle scattering spectrometer (SANS-J-II) at Research Reactor JRR3, Japan 査読有り

Koizumi S., Iwase H., Suzuki J.i., Oku T., Motokawa R., Sasao H., Tanaka H., Yamaguchi D., Shimizu H.M., Hashimoto T.

Physica B Condensed Matter 385-86 巻頁： 1000 - 1006 2006年11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：Physica B Condensed Matter

By employing focusing lenses of sextupole permanent magnet and biconcave MgF<inf>2</inf> crystal, and high-resolution photomultiplier, SANS-J (pinhole small-angle neutron scattering spectrometer at research reactor JRR3, Tokai) was reconstructed to focusing and polarized neutron ultra-small-angle scattering spectrometer (SANS-J-II). Consequently, an accessible minimum wave number q<inf>min</inf> was improved from 3×10-3 Å-1 to 3×10-4 Å-1. Furthermore, we added 3He sub-detectors with an analyzer super mirror at a sample position. With this setup, we perform polarization analysis at high q (>0.2 Å-1) in order to quantitatively discriminate spin incoherent scattering from hydrogen or to perform spin contrast variation, by a dynamic nuclear polarization method (>0.2 Å-1). © 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2006.05.320

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Superconducting Detector Array for Terahertz Imaging Applications

Ariyoshi Seiichiro, Otani Chiko, Dobroiu Adrian, MATSUO Hiroshi, SATO Hiromi, TAINO Tohru, KAWASE Kodo, SHIMIZU Hirohiko M.

Japanese journal of applied physics. Pt. 2, Letters 45 巻 ( 37 ) 頁： L1004 - L1006 2006年10月

Superconducting detector array for terahertz imaging applications 査読有り

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

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS 45 巻 ( 37-41 ) 頁： L1004 - L1006 2006年10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：Japanese Journal of Applied Physics Part 2 Letters

We designed, fabricated, and characterized a superconducting detector array for terahertz imaging applications. To evaluate the optical performance as an imaging array, we measured the spectral response of a 5-pixel linear array detector, and confirmed its sensitivity peaks to be at the same frequency within accuracy of one percent in the range of 0.65 THz. The frequency peaks are also in good agreement with a numerical calculation. This linear array was tested in the nondestructive imaging of a metallic pattern and an integrated-circuit card, and allowed the shortening of the total acquisition time. High fabrication yield of about 99% was achieved for single superconducting tunnel junctions, which led to 90% yield for the detectors. ©2006 The Japan Society of Applied Physics.

DOI： 10.1143/JJAP.45.L1004

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超伝導トンネル接合素子を用いたテラヘルツ波検出器アレイの開発とイメージング

大谷知行, 有吉誠一郎, 田井野徹, 川瀬晃道, 佐藤広海, 清水裕彦

電子情報通信学会技術研究報告. ED, 電子デバイス 105 巻 ( 629 ) 頁： 1 - 6 2006年2月

出版者・発行元：一般社団法人電子情報通信学会

テラヘルツ波は、適度な物質透過性と空間分解能や指紋スペクトルによる物質同定能力といった魅力的な特長を有し、近年の発生・分光手法の進展にともないイメージングをはじめとする様々な応用が提案されてきている。一方で、イメージングデバイスの開発は進んでおらずアレイ型の高性能検出器が求められている。我々は、テラヘルツイメージングの新デバイス開発として、超伝導トンネル接合素子を用いた2種の検出器の開発と応用開拓を進めている。本稿では、光補助トンネリングを用いた検出器アレイ、および、基板吸収を用いた広帯域検出器のそれぞれについて、検出器の概要、動作原理、性能、及び、イメージングに向けた取り組みについて紹介する。

CiNii Research

Direct and Indirect Detection of Terahertz Waves using a Nb-based Superconducting Tunnel Junction 査読有り Open Access

Otani Chiko, Nakano Ran, Taino Tohru, Shibuya Takayuki, Ariyoshi Seiichiro, Yoshimura Shota, Myoren Hiroaki, Sato Hiromi, Shimizu Hirohiko M., Takada Susumu, Kawase Kodo

7TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS'05) 43 巻 ( 1 ) 頁： 1303 - 1306 2006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：Journal of Physics: Conference Series

We are developing a broadband THz detectors using Nb-based superconducting tunnel junctions. We found two components in a current signal for 1-2 THz pulse input. From the comparison of results obtained for the signals, the frequency response for the different size of STJs and the STJs fabricated on different substrate materials, we demonstrate that they correspond to photons absorbed with the superconductor electrode (referred as 'direct' component) and phonons generated by photons absorbed with the substrate (referred as 'phononmediated' component). © 2006 IOP Publishing Ltd.

DOI： 10.1088/1742-6596/43/1/318

Open Access

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