研究者詳細 - 清水　裕彦

Rebunching low energy neutrons by magnetic acceleration and deceleration Open Access

Iwashita Y., Imajo S., Kitaguchi M., Arimoto Y., Shimizu H.M., Yoshioka T., Seki Y., Geltenbort P.

Ipac 2012 International Particle Accelerator Conference 2012 頁： 2766 - 2768 2012年12月

出版者・発行元：Ipac 2012 International Particle Accelerator Conference 2012

Acceleration control for neutrons was demonstrated. Ultra cold neutrons (UCN) -neutrons with energies less than 300 neV - can be accelerated or decelerated by means ofstatic magnetic and RF fields. Neutrons have a magnetic dipole moment, and hence theirkinetic energies vary depending on their spin in magnetic fields. Their kinetic energiesare restored when they leave the magnetic field area if their spin did not flip. A spinflip can be triggered by applying an RF field whose frequency coincides with the spinprecession frequency of a neutron in this magnetic field. This allows to tune the kineticenergy of neutrons. This method can be used to rebunch a pulsed beam of neutrons to astorage bottle that can store UCN. By opening and closing the storage bottle synchronouslywith the rebuncher, high UCN densities can be achieved for precision measurements ofneutron properties such as the Electric Dipole Moment. Copyright © 2012 by IEEE.

Demonstration of focusing by a neutron accelerator

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

出版者・発行元：Physical Review A Atomic Molecular and Optical Physics

Space-time focusing was demonstrated by a neutron accelerator. Test experiments were performed by using very slow neutrons at High-Flux Reactor at Institut Laue-Langevin. Focusing of neutrons at the detector position through the accelerator was observed. Focusing neutrons enables us to transport the neutrons while maintaining density from source to experimental position. This will be a powerful technique for measurement of the permanent electric dipole moment of neutrons, which require a high density of neutrons. © 2012 American Physical Society.

DOI： 10.1103/PhysRevA.86.023843

Variable permanent magnet multipoles

Iwashita Y., Yamada M., Ushijima S., Fuwa Y., Nasu Y., Tongu H., Masuzawa M., Shimizu H.

IEEE Transactions on Applied Superconductivity 22 巻 ( 3 ) 2012年6月

出版者・発行元：IEEE Transactions on Applied Superconductivity

Permanent magnet quadrupoles (PMQ) and sextupoles (PMSx) have been fabricated and tested. Their effective strengths are variable. The PMQ has been developed as a final focus magnet for a linear collider. There is enough space to put Gluckstern's 5-ring singlet structures in each incoming beam line. The magnetic center offsets and higher harmonic components can be adjusted by adjusting the positions of the magnet pieces with screws on holders. The measured integrated gradient can be reduced down to less than 1% of the maximum strength. The PMSx has been developed to focus pulsed cold neutrons for a small angle neutron scattering (SANS) experiment. The strength is modulated by a so called double ring structure, where the inner ring is fixed and the outer ring is rotated. A torque canceller can reduce the torque to rotate the outer ring by one third of its original magnitude. The focal length of the fabricated triplet lens is less than 50 cm for Very Cold Neutrons (VCN). It is demonstrated that VCN-SANS can shorten a SANS beamline, which usually has a few tens of meters, down to 2 ∼ 3 meters. © 2002-2011 IEEE.

DOI： 10.1109/TASC.2012.2185471

Demonstration of optical thickness measurement using multilayer cold neutron interferometer Open Access

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

5TH EUROPEAN CONFERENCE ON NEUTRON SCATTERING 340 巻 2012年

出版者・発行元：Journal of Physics: Conference Series

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-μm-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

11aSG-5 ダイヤモンドライクカーボン薄膜による中性子ミラーの開発(11aSG 中性子・ポジトロニウム,素粒子実験領域) Open Access

櫻井大, 清水裕彦, 猪野隆, 吉岡瑞樹, 北口雅暁, 三島賢二, 覚正信徳

日本物理学会講演概要集 67.2.1 巻 ( 0 ) 頁： 13 2012年

25pCL-5 SEOP式偏極^3He中性子スピンフィルターにおける到達^3He偏極率制限因子についての考察(25pCL X線・粒子線(中性子),領域10(誘電体,格子欠陥,X線・粒子線,フォノン)) Open Access

坂口佳史, 吉良弘, 奥降之, 篠原武尚, 鈴木淳市, 酒井健二, 中村充孝, 鈴谷賢太郎, 相澤一也, 新井正敏, 武田全康, 遠藤康夫, 有本靖, 猪野隆, 清水裕彦, 神山崇, 大山研司, 平賀晴弘, 山田和芳, 張烈錚, 尾原幸治, 加倉井和久

日本物理学会講演概要集 67.1.4 巻 ( 0 ) 頁： 1006 2012年

25pCL-14 J-PARC偏極度解析中性子分光器計画の進展(25pCL X線・粒子線(中性子),領域10(誘電体,格子欠陥,X線・粒子線,フォノン)) Open Access

大山研司, 岩佐和晃, 横尾哲也, 伊藤晋一, 富安啓輔, 松浦直人, 平賀晴弘, 藤田全基, 木村宏之, 佐藤豊人, 佐藤卓, 有馬孝尚, 猪野隆, 吉良弘, 坂口佳史, 奥隆之, 有本靖, 鈴木淳市, 清水裕彦, 武田全康, 金子耕士, 日野正裕, 武藤豪, 野尻浩之

日本物理学会講演概要集 67.1.4 巻 ( 0 ) 頁： 1008 2012年

24aFA-7 中性子電気双極子モーメント測定実験のための高密度超冷中性子輸送法の開発(24aFA ミュオニウム・中性子・ポジトロニウム,素粒子実験領域) Open Access

北口雅暁, 吉岡瑞樹, 清水裕彦, 有本靖, 竹谷薫, 猪野隆, 武藤豪, 岩下芳久, 今城想平, 三島賢二, 神谷好郎, 山下了, 関義親, 旭耕一郎, 吉見彰洋, 嶋達志

日本物理学会講演概要集 67.1.1 巻 ( 0 ) 頁： 24 2012年

14aSG-3 低エネルギー中性子小角散乱を用いた重力法則の検証(14aSG 新粒子・新物理の探索,素粒子実験領域) Open Access

松本悟, 吉岡瑞樹, 清水裕彦, 嶋達志, 猪野隆

日本物理学会講演概要集 67.2.1 巻 ( 0 ) 頁： 25 2012年

11aSG-7 J-PARC MLFにおける超冷中性子(UCN)Rebuncherの開発(11aSG 中性子・ポジトロニウム,素粒子実験領域) Open Access

今城想平, 岩下芳久, 清水裕彦, 吉岡瑞樹, 北口雅暁, 有本靖, 関義親

日本物理学会講演概要集 67.2.1 巻 ( 0 ) 頁： 13 2012年

11aSG-6 超冷中性子用ミラー基板の表面ラフネスの評価(11aSG 中性子・ポジトロニウム,素粒子実験領域) Open Access

関義親, 北口雅暁, 古岡瑞樹, 清水裕彦, 山田悟史

日本物理学会講演概要集 67.2.1 巻 ( 0 ) 頁： 13 2012年

27aXC-10 電磁カロリメータFORESTを用いた∧光生成反応の研究(27aXC 実験核物理領域,理論核物理領域合同エキゾチック系・ハドロン構造(合同),実験核物理領域) Open Access

土川雄介, 藤村寿子, 橋本亮, 石川貴嗣, 桝本新一, 宮部学, 中村聡彦, 清水肇, 鈴木耕拓, 山崎寛仁

日本物理学会講演概要集 67.1.1 巻 ( 0 ) 頁： 112 2012年

Development of polarized Xe gas target for neutron experiment at J-PARC Open Access

Sakai K., Oku T., Shinohara T., Kira H., Ooi M., Maekawa F., Kakurai K., Ino T., Arimoto Y., Shimizu H. M., Sakaguchi Y., Suzuki J., Ohoyama K., Chang L. J.

5TH EUROPEAN CONFERENCE ON NEUTRON SCATTERING 340 巻 2012年

出版者・発行元：Journal of Physics: Conference Series

At the Materials and Life science experimental Facility (MLF) in J-PARC, an experiment of detecting a neutron polarizing ability caused by a neutron-nuclear spin correlation at a resonant peak of 129Xe is planned. We evaluated measurable quantities based on a neutron optical theorem, developed a polarized Xe gas system, and carried out a feasibility test of our apparatus.

DOI： 10.1088/1742-6596/340/1/012037

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

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

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

出版者・発行元：Physica B Condensed Matter

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 3He 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. © 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2011.01.009

Development and test of SEOP neutron spin filter in Japan

Kira H., Sakaguchi Y., Oku T., Suzuki J., Nakamura M., Arai M., Kakurai K., Endo Y., Arimoto Y., Ino T., Shimizu H.M., Kamiyama T., Tsutsumi K., Ohoyama K., Hiraka H., Yamada K., Chang L.J.

Physica B Condensed Matter 406 巻 ( 12 ) 頁： 2433 - 2435 2011年6月

出版者・発行元：Physica B Condensed Matter

We have begun the development of an in-situ spin-exchange optical pumping (SEOP) system aiming to use it as a neutron spin filter for incident beam polarization at the Japan Proton Accelerator Research Complex (J-PARC). To use it, it is recommended that the optics be adjusted easily, have high stability, and have a small size. In this paper we improved our previous SEOP system aiming to use it in J-PARC and performed a neutron beam test at the JRR-3 NOP beamline to see the performance of the neutron spin filter (NSF). The polarization of the 3He gas reached 73%. This paper gives the present status of the development of in-situ SEOP system in J-PARC. © 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2010.12.019

External cavity design of high-power diode laser for polarized helium-3 neutron spin filters based on spin-exchange optical pumping

Arimoto Y., Ino T., Shimizu H.M., Kamiyama T., Kira H., Oku T., Sakaguchi Y., Kakurai K., Sakai K., Suzuki J., Koizumi S., Arai M., Endo Y., Nakamura M., Shinohara T., Takeda M., Wakimoto S., Yamazaki D., Ohoymama K., Hiraka H., Yamada K., Tsutsumi K., Chang L.J.

Physica B Condensed Matter 406 巻 ( 12 ) 頁： 2439 - 2442 2011年6月

出版者・発行元：Physica B Condensed Matter

Polarized neutron spin filters are being developed based on spin-exchange optical pumping. In the present study a high-power diode laser (85 W) was used to excite Rb atoms and the laser linewidth was narrowed using an external cavity. The optics in the external cavity were designed by ray tracing. The ray-trace calculations demonstrated that a doublet lens in front of the laser eliminates aberrations. The maximum spectral peak height in the doublet optics was found to be 25% higher than for a singlet lens. © 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2010.11.089

A transport optics for pulsed ultracold neutron sources

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

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 634 巻 ( 1 SUPPL. ) 頁： S25 - S27 2011年4月

出版者・発行元：Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment

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. © 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nima.2010.06.210

The performance of magnetic lens for focusing VCN-SANS

Yamada, M; Iwashita, Y; Kanaya, T; Ichikawa, M; Tongu, H; Kennedy, SJ; Shimizu, HM; Mishima, K; Yamada, NL; Hirota, K; Carpenter, JM; Lal, J; Andersen, K; Geltenbort, P; Guerard, B; Manzin, G; Hino, M; Kitaguchi, M; Bleuel, M

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 634 巻 ( 1 SUPPL. ) 頁： S156 - S160 2011年4月

出版者・発行元：Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment

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 1.5×104T/m2g′5.9×104T/ m2. 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 (≈3mm) over a wavelength range of 30λ48 in focal length of ≈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)<inf>100</inf>(PPO) <inf>65</inf>(PEO)<inf>100</inf> tri-block copolymer in deuterium oxide. The results of the focusing experiment and the focusing VCN-SANS are presented. © 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nima.2010.06.259

Satellite pulsed tiny neutron source at Kyoto University, Sakyo

Iwashita Y., Nagae T., Tanimori T., Fujioka H., Shimizu H.

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 634 巻 ( 1 SUPPL. ) 頁： S97 - S99 2011年4月

出版者・発行元：Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment

A pulsed neutron source facility will be constructed at Kyoto University, where the accelerated 3.5 MeV proton beam will bombard a Li or Be target to generate neutrons. The average current, the pulse width and the typical repetition rate are 100 μA, 100 μs and 70 Hz, respectively. The purposes of the system are neutron imaging, material science, fundamental physics, etc. This kind of compact facility, which can be distributed at modest cost, will help to incubate new ideas and promote growth of neutron science worldwide. © 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nima.2010.06.356