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論文

Effect of nanoscale cellular structure on the mechanical properties of Inconel 718 with unique hierarchical structure fabricated by laser powder bed fusion

Cho, K.*; 山下 葵平*; 角谷 心之輔*; 齊藤 拓馬*; 佐々木 泰祐*; 澤泉 克彦*; 奥川 将行*; 小泉 雄一郎*; 眞山 剛*; 菊川 泰地*; et al.

Acta Materialia, 303, p.121696_1 - 121696_18, 2026/01

https://doi.org/10.1016/j.actamat.2025.121696
 被引用回数：6 パーセンタイル：83.48(Materials Science, Multidisciplinary)

The deformation behavior and strengthening mechanism of Inconel 718 with a hierarchical structure composed of microscale crystallographic lamellar microstructure (CLM) and nanoscale cellular structure, fabricated by laser powder bed fusion, were clarified via nanoscale microstructural and in-situ neutron diffraction analyses. The CLM is a layered structure parallel to the building direction (BD) and consists of relatively wide main and narrow sub-layers with $$<$$110$$>$$ and $$<$$100$$>$$ orientations, respectively, with respect to BD. This is the first study to demonstrate that the yield stress of the alloys depends strongly on deformation stresses of the sub-layers, even though Schmid factors of the primary slip system for both layers are the same. The sub-layer continues to deform elastically even beyond the micro-yield point of the main layer, which results in the macroscopic strengthening at an early stage of deformation. On the other hand, the cellular structure is formed in both layers, associated with a dendritic cell growth along $$<$$100$$>$$ direction, Nb segregation between the cells and an accumulation of dislocations to decrease a residual stress. The cell boundaries with numerous dislocations and Nb segregation act as a strong barrier to dislocation motion resulting in a stress increase through the Hall-Petch law, even though they are low-angle grain boundaries. The spacing and morphology of the cell boundary depend strongly on fabrication conditions. The optimized cellular structure provides significant strengthening comparable to or greater than that caused by large-angle grain boundaries, thereby increasing the macroscopic strength of the alloys through hardening of the sub-layer.

論文

Acid dissociation constant of bis(2-ethylhexyl) hydrogen phosphate impregnated in a polymer layer coated on silica microparticles

宮川 晃尚*; 竹内 正行; 新井 剛*; 渡部 創; 佐野 雄一; 中谷 清治*

Bulletin of the Chemical Society of Japan, 95(4), p.566 - 568, 2022/04

https://doi.org/10.1246/bcsj.20220011
 被引用回数：3 パーセンタイル：14.20(Chemistry, Multidisciplinary)

高分子相に含浸させた抽出剤のpKaが、架橋度や他の抽出剤の共存によって変化し、高分子相の疎水性が変化することを実証した。本成果は、新規な固体抽出吸着剤の開発に役立つと考えられる。

論文

Optical selection rules of the magnetic excitation in the $$S$$ = $$frac{1}{2}$$ one-dimensional Ising-like antiferromagnet BaCo$$_{2}$$V$$_{2}$$O$$_{8}$$

木村 尚次郎*; 大西 弘明; 奥谷 顕*; 赤木 暢*; 鳴海 康雄*; 萩原 政幸*; 奥西 巧一*; 金道 浩一*; He, Z.*; 谷山 智康*; et al.

Physical Review B, 105(1), p.014417_1 - 014417_9, 2022/01

https://doi.org/10.1103/PhysRevB.105.014417
 被引用回数：6 パーセンタイル：30.80(Materials Science, Multidisciplinary)

In this study, we clarify the selection rules of optical transitions from the ground state to the magnetic excited states in the quasi-one-dimensional quantum Ising-like antiferromagnet BaCo$$_{2}$$V$$_{2}$$O$$_{8}$$ with spin $$S$$ = $$frac{1}{2}$$ using the high-field electron spin resonance measurement with illuminating polarized electromagnetic waves. We demonstrate that the unconventional magnetic excitation via the pair creation of quasipaticles at wave numbers $$q_{z}=pi/2$$ and $$pi$$ in the field-induced quantum critical state can couple with both oscillating magnetic and electric fields. Our density matrix renormalization group calculations indicate that the observed selection rules can be explained by two- and four-fold periodical spin interactions, originating from the screw chain structure in BaCo$$_{2}$$V$$_{2}$$O$$_{8}$$, in addition to the magnetoelectric coupling between spins and electric dipoles.

論文

Spin excitations of the $$S$$=1/2 one-dimensional Ising-like antiferromagnet BaCo$$_{2}$$V$$_{2}$$O$$_{8}$$ in transverse magnetic fields

奥谷 顕*; 大西 弘明; 木村 尚次郎*; 竹内 徹也*; 木田 孝則*; 森 道康; 三宅 厚志*; 徳永 将史*; 金道 浩一*; 萩原 政幸*

Journal of the Physical Society of Japan, 90(4), p.044704_1 - 044704_9, 2021/04

https://doi.org/10.7566/JPSJ.90.044704
 被引用回数：8 パーセンタイル：52.47(Physics, Multidisciplinary)

The high-field multifrequency electron spin resonance (ESR), the magnetization, and the specific heat of single crystals of BaCo$$_{2}$$V$$_{2}$$O$$_{8}$$ (a quasi-one-dimensional Ising-like antiferromagnet with $$S=1/2$$) were measured in two different transverse magnetic fields: $$H parallel [100]$$ and $$H parallel [110]$$. A softening of the lowest ESR mode was observed near the saturation field of the magnetization around 40 T in $$H parallel [110]$$, whereas it occurs around 10 T in $$H parallel [100]$$, far below the saturation field. These observations were reproduced by numerical calculations using the density-matrix renormalization group methods, including the staggered magnetic fields induced by a uniform external magnetic field and the interchain magnetic exchange interaction. We found that the directional dependence of the lowest mode originates mainly from the remarkable angular dependence of the induced magnetic field. The interchain interaction is also quantitatively important for reproducing the experimental results. The directional dependence of the lowest mode is demonstrated by the particle-hole excitation of spinons using the Jordan-Wigner transformation.

論文

Improvement in flow-sheet of extraction chromatography for trivalent minor actinides recovery

渡部 創; 先崎 達也; 柴田 淳広; 野村 和則; 竹内 正行; 中谷 清治*; 松浦 治明*; 堀内 勇輔*; 新井 剛*

Journal of Radioanalytical and Nuclear Chemistry, 322(3), p.1273 - 1277, 2019/12

https://doi.org/10.1007/s10967-019-06808-y
 被引用回数：6 パーセンタイル：42.77(Chemistry, Analytical)

Extraction chromatography flow-sheet employing octyl(phenyl)-$$N,N$$-diisobutylcarbonoylmethylphosphine oxide (CMPO) and $$bis$$(2-ethylhexyl) hydrogen phosphate (HDEHP) extractants for trivalent minor actinide recovery was modified to improve column separation performance. Excellent trivalent minor actinides recovery performance was obtained by column separation experiments on nitric acid solution containing the trivalent minor actinides and representative fission product elements, i.e. recovery yields $$>$$ 93% with sufficient decontamination factors against the fission products. Those are the best performance which we have ever obtained by experiments inside hot cell.

論文

Extraction mechanism of lanthanide ions into silica-based microparticles studied by single microparticle manipulation and microspectroscopy

大高 稔紀*; 佐藤 辰巳*; 大野 真平; 名越 航平; 安倍 諒治*; 新井 剛*; 渡部 創; 佐野 雄一; 竹内 正行; 中谷 清治*

Analytical Sciences, 35(10), p.1129 - 1133, 2019/10

https://doi.org/10.2116/analsci.19P155
 被引用回数：9 パーセンタイル：29.74(Chemistry, Analytical)

Single porous silica microparticles coated with styrene-divinylbenzene polymer (SDB) impregnated with octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) were injected into an aqueous 3 mol/L nitric acid solution containing trivalent lanthanide (Ln(III)), as a high-level liquid waste model, using the microcapillary manipulation-injection technique; and the extraction rate of Ln(III), as an Ln(III)-CMPO complex, into the single microparticles was measured by luminescence microspectroscopy. The extraction rate significantly depended on the Ln(III), CMPO, or NO$$_{3}$$$$^{-}$$ concentration, and was analyzed in terms of diffusion in the pores of the microparticles and complex formation of Ln(III). The results indicated that the rate-determining step in Ln(III) extraction was the diffusion in the pore solution of the microparticles.

論文

Measurements of the $$^{243}$$Am neutron capture and total cross sections with ANNRI at J-PARC

木村 敦; 中村 詔司; 寺田 和司*; 中尾 太郎*; 水山 一仁*; 岩本 信之; 岩本 修; 原田 秀郎; 片渕 竜也*; 井頭 政之*; et al.

Journal of Nuclear Science and Technology, 56(6), p.479 - 492, 2019/06

https://doi.org/10.1080/00223131.2019.1598508
 被引用回数：15 パーセンタイル：75.62(Nuclear Science & Technology)

Neutron total and capture cross sections of $$^{243}$$Am have been measured in Accurate Neutron Nucleus Reaction measurement Instrument at Materials and Life Science Experimental Facility of Japan Proton Accelerator Research Complex with a neutron TOF method. The neutron capture cross section in the energy region from 10 meV to 100 eV was determined using an array of Ge detectors. Three samples with different activities were used for measurements of the capture cross section. The neutron total cross section in the energy region from 4 meV to 100 eV was measured using Li-glass detectors. Derived cross-section value at neutron energy of 0.0253 eV is 87.7$$pm$$5.4 b for the capture cross section and 101$$pm$$11 b for the total cross section.

報告書

東海再処理施設周辺の環境放射線モニタリング結果; 2017年度

中野 政尚; 藤田 博喜; 水谷 朋子; 根本 正史; 飛田 慶司; 河野 恭彦; 細見 健二; 外間 智規; 西村 朋紘; 松原 菜摘; et al.

JAEA-Review 2018-025, 171 Pages, 2019/02

JAEA-Review-2018-025.pdf:3.81MB

核燃料サイクル工学研究所では、「日本原子力研究開発機構核燃料サイクル工学研究所再処理施設保安規定、第IV編 環境監視」に基づき、再処理施設周辺の環境放射線モニタリングを実施している。本報告書は、2017年4月から2018年3月までの間に実施した環境モニタリングの結果、及び大気, 海洋への放射性物質の放出に起因する周辺公衆の線量算出結果について、取りまとめたものであり、2011年3月に発生した東京電力福島第一原子力発電所事故の影響が多くの項目で見られた。なお、環境監視計画の概要、測定方法の概要、測定結果及びその経時変化、気象統計結果、放射性廃棄物の放出状況、東京電力福島第一原子力発電所事故の影響による平常の変動幅を外れた値の評価について付録として収録した。

論文

Local structure study of the iron-based systems of BaFe$$_2$$As$$_2$$ and LiFeAs by X-ray PDF and XAFS analyses

Li, S.*; 豊田 真幸*; 小林 義明*; 伊藤 正行*; 池内 和彦*; 米田 安宏; 大谷 彬*; 松村 大樹; 浅野 駿*; 水木 純一郎*; et al.

Physica C, 555, p.45 - 53, 2018/12

https://doi.org/10.1016/j.physc.2018.10.003
 被引用回数：2 パーセンタイル：8.17(Physics, Applied)

鉄系超伝導体のBaFe$$_2$$As$$_2$$とLiFeAsの局所構造解析をX線PDF解析とXAFSを利用して行った。BaFe$$_2$$As$$_2$$の構造相転移温度ではPDFで得られた局所構造には変化が見られたが、EXAFSで得られた局所構造には変化を見出すことができなかった。これらのデータは室温の平均構造が正方晶相において、局所的な斜方歪みを考慮する必要があることを示唆している。

論文

Measurements of neutron total and capture cross sections of $$^{241}$$Am with ANNRI at J-PARC

寺田 和司*; 木村 敦; 中尾 太郎*; 中村 詔司; 水山 一仁*; 岩本 信之; 岩本 修; 原田 秀郎; 片渕 竜也*; 井頭 政之*; et al.

Journal of Nuclear Science and Technology, 55(10), p.1198 - 1211, 2018/10

AA2017-0628.pdf:2.06MB

https://doi.org/10.1080/00223131.2018.1485519
 被引用回数：18 パーセンタイル：79.93(Nuclear Science & Technology)

Neutron total and capture cross sections of $$^{241}$$Am have been measured with a new data acquisition system and a new neutron transmission measurement system installed in Accurate Neutron Nucleus Reaction measurement Instrument (ANNRI) at Materials and Life Science Experimental Facility (MLF) of Japan Proton Accelerator Research Complex (J-PARC). The neutron total cross sections of $$^{241}$$Am were determined by using a neutron time-of-flight method in the neutron energy region from 4 meV to 2 eV. The thermal total cross section of $$^{241}$$Am was derived with an uncertainty of 2.9%. A pulse-height weighting technique was applied to determine neutron capture yields of $$^{241}$$Am. The neutron capture cross sections were determined by the time-of-flight method in the neutron energy region from the thermal to 100 eV, and the thermal capture cross section was obtained with an uncertainty of 4.1%. The evaluation data of JENDL-4.0 and JEFF-3.2 were compared with the present results.

報告書

東海再処理施設周辺の環境放射線モニタリング結果; 2016年度

中野 政尚; 藤田 博喜; 水谷 朋子; 根本 正史; 飛田 慶司; 細見 健二; 永岡 美佳; 外間 智規; 西村 朋紘; 小池 優子; et al.

JAEA-Review 2017-028, 177 Pages, 2018/01

JAEA-Review-2017-028.pdf:3.61MB

核燃料サイクル工学研究所では、「日本原子力研究開発機構核燃料サイクル工学研究所再処理施設保安規定、第IV編 環境監視」に基づき、再処理施設周辺の環境放射線モニタリングを実施している。本報告書は、2016年4月から2017年3月までの間に実施した環境モニタリングの結果、及び大気、海洋への放射性物質の放出に起因する周辺公衆の線量算出結果について、取りまとめたものであり、2011年3月に発生した東京電力福島第一原子力発電所事故の影響が多くの項目でみられた。なお、環境監視計画の概要、測定方法の概要、測定結果及びその経時変化、気象統計結果、放射性廃棄物の放出状況、東京電力福島第一原子力発電所事故の影響による平常の変動幅を外れた値の評価について付録として収録した。

論文

Research and development for accuracy improvement of neutron nuclear data on minor actinides

原田 秀郎; 岩本 修; 岩本 信之; 木村 敦; 寺田 和司; 中尾 太郎; 中村 詔司; 水山 一仁; 井頭 政之*; 片渕 竜也*; et al.

EPJ Web of Conferences, 146, p.11001_1 - 11001_6, 2017/09

https://doi.org/10.1051/epjconf/201714611001
 被引用回数：2 パーセンタイル：73.21(Nuclear Science & Technology)

A nuclear data project entitled Research and development for Accuracy Improvement of neutron nuclear data on Minor ACtinides (AIMAC) is being performed in Japan. The objective of the project is to improve accuracy of neutron nuclear data for minor actinides and some fission products, which is required for developing innovative nuclear system transmuting these nuclei. Following research items have been conducted to achieve the objective: (1) Measurements of thermal neutron capture cross-sections by activation methods, (2) High-precision quantifications of shielded sample amounts used for TOF measurement, (3) Resonance parameter determinations at J-PARC/ANNRI and KURRI/LINAC, (4) Extension of capture cross sections to high energy neutrons at J-PARC/ANNRI, (5) High quality evaluation based on iterative communication with experimenters. The achievement of the project is presented.

論文

Magnetic structure and dispersion relation of the $$S$$=1/2 quasi-one-dimensional Ising-like antiferromagnet BaCo$$_{2}$$V$$_{2}$$O$$_{8}$$ in a transverse magnetic field

松田 雅昌*; 大西 弘明; 奥谷 顕*; Ma, J.*; Agrawal, H.*; Hong, T.*; Pajerowski, D. M.*; Copley, J. R. D.*; 奥西 巧一*; 森 道康; et al.

Physical Review B, 96(2), p.024439_1 - 024439_8, 2017/07

https://doi.org/10.1103/PhysRevB.96.024439
 被引用回数：16 パーセンタイル：51.63(Materials Science, Multidisciplinary)

BaCo$$_{2}$$V$$_{2}$$O$$_{8}$$ consists of Co chains, in which Co$$^{2+}$$ ion carries a fictitious spin $$frac{1}{2}$$ with Ising anisotropy. We performed elastic and inelastic neutron scattering experiments in BaCo$$_{2}$$V$$_{2}$$O$$_{8}$$ in magnetic field perpendicular to the $$c$$ axis which is the chain direction. With applying magnetic field along the $$a$$ axis at 3.5 K, the antiferromagnetic order with the easy axis along the $$c$$ axis, observed in zero magnetic field, is completely suppressed at 8 T, while the magnetic field gradually induces an antiferromagnetic order with the spin component along the $$b$$ axis. We also studied magnetic excitations as a function of transverse magnetic field. The lower boundary of the spinon excitations splits gradually with increasing magnetic field. The overall feature of the magnetic excitation spectra in magnetic field is reproduced by the theoretical calculation based on the spin $$frac{1}{2}$$ $$XXZ$$ antiferromagnetic chain model, which predicts that the dynamic magnetic structure factor of the spin component along the chain direction is enhanced and that along the field direction has clear incommensurate correlations.

報告書

東海再処理施設周辺の環境放射線モニタリング結果; 2015年度

中野 政尚; 藤田 博喜; 水谷 朋子; 細見 健二; 永岡 美佳; 外間 智規; 横山 裕也; 西村 朋紘; 松原 菜摘; 前原 勇志; et al.

JAEA-Review 2016-035, 179 Pages, 2017/03

JAEA-Review-2016-035.pdf:4.2MB

核燃料サイクル工学研究所では、「日本原子力研究開発機構核燃料サイクル工学研究所再処理施設保安規定、第IV編 環境監視」に基づき、再処理施設周辺の環境放射線モニタリングを実施している。本報告書は、2015年4月から2016年3月までの間に実施した環境モニタリングの結果、及び大気、海洋への放射性物質の放出に起因する周辺公衆の線量算出結果について、取りまとめたものであり、2011年3月に発生した東京電力福島第一原子力発電所事故の影響が多くの項目でみられた。なお、環境監視計画の概要、測定方法の概要、測定結果及びその経時変化、気象統計結果、放射性廃棄物の放出状況、東京電力福島第一原子力発電所事故の影響による平常の変動幅を外れた値の評価について付録として収録した。

論文

Overview of JENDL-4.0/HE and benchmark calculations

国枝 賢; 岩本 修; 岩本 信之; 湊 太志; 岡本 力; 佐藤 達彦; 中島 宏; 岩元 洋介; 岩元 大樹; 北谷 文人; et al.

JAEA-Conf 2016-004, p.41 - 46, 2016/09

https://doi.org/10.11484/jaea-conf-2016-004

加速器を用いた種々のアプリケーションを開発・設計するための基礎データとして、中性子や陽子入射の高エネルギー核データを整備する必要がある。本研究では、光学モデルや前平衡モデル計算における最新の知見を投入してJENDL/HE-2007の見直しを行うと共に、特に医療分野で需要の高い$$^{6,7}$$Liや$$^{9}$$Be等の核種を新たに加えて、約130核種に対する200MeVまでの中性子・陽子核データライブラリJENDL-4.0/HEを完成させた。本発表においては、ライブラリの概要を説明すると共に、粒子輸送計算コードPHITSやMCNPXを用いた中性子透過計算等における積分検証結果を中心に報告する。

論文

Measurement of the $$^{77}$$Se($$gamma$$, n) cross section and uncertainty evaluation of the $$^{79}$$Se(n, $$gamma$$) cross section

北谷 文人; 原田 秀郎; 後神 進史*; 岩本 信之; 宇都宮 弘章*; 秋宗 秀俊*; 豊川 弘之*; 山田 家和勝*; 井頭 政之*

Journal of Nuclear Science and Technology, 53(4), p.475 - 485, 2016/04

https://doi.org/10.1080/00223131.2015.1056760
 被引用回数：5 パーセンタイル：37.01(Nuclear Science & Technology)

We precisely measured the ($$gamma$$, n) cross section for $$^{77}$$Se by developing a spectroscopic method utilizing Laser Compton-Scattering $$gamma$$-rays. Moreover, the $$^{79}$$Se(n, $$gamma$$) $$^{80}$$Se cross section was deduced using the statistical model calculation code CCONE with $$gamma$$-ray strength functions adjusted to reproduce the ($$gamma$$, n) cross sections for $$^{77}$$Se and the even Se isotopes $$^{76}$$Se, $$^{78}$$Se and $$^{80}$$Se. The reliability of the $$^{79}$$Se(n, $$gamma$$) $$^{80}$$Se cross section calculated by CCONE with the adjusted $$gamma$$-ray strength function was evaluated by comparing available experimental (n, $$gamma$$) cross sections for stable $$^{76, 77}$$Se isotopes and those calculated by CCONE with the adjusted $$gamma$$-ray strength function. The result provides fundamental data for the study of nuclear transmutation for the long-lived fission product of $$^{79}$$Se.

報告書

東海再処理施設周辺の環境放射線モニタリング結果; 2014年度

渡辺 均; 中野 政尚; 藤田 博喜; 竹安 正則; 水谷 朋子; 磯崎 徳重*; 永岡 美佳; 外間 智規; 横山 裕也; 西村 朋紘; et al.

JAEA-Review 2015-034, 175 Pages, 2016/03

JAEA-Review-2015-034.pdf:8.13MB

核燃料サイクル工学研究所では、「日本原子力研究開発機構核燃料サイクル工学研究所再処理施設保安規定、第IV編 環境監視」に基づき、再処理施設周辺の環境放射線モニタリングを実施している。本報告書は、2014年4月から2015年3月までの間に実施した環境モニタリングの結果、及び大気、海洋への放射性物質の放出に起因する周辺公衆の線量算出結果について、取りまとめたものであり、2011年3月に発生した東京電力福島第一原子力発電所事故(以下、東電福島第一原発事故)の影響が多くの項目でみられた。なお、環境監視計画の概要、測定方法の概要、測定結果及びその経時変化、気象統計結果、放射性廃棄物の放出状況、東電福島第一原子力発電所事故の影響による平常の変動幅を外れた値の評価について付録として収録した。

論文

Current activities and future plans for nuclear data measurements at J-PARC

木村 敦; 原田 秀郎; 中村 詔司; 岩本 修; 藤 暢輔; 小泉 光生; 北谷 文人; 古高 和禎; 井頭 政之*; 片渕 竜也*; et al.

European Physical Journal A, 51(12), p.180_1 - 180_8, 2015/12

https://doi.org/10.1140/epja/i2015-15180-2
 被引用回数：3 パーセンタイル：26.97(Physics, Nuclear)

In order to improve the data accuracy of neutron-capture cross sections of minor actinides (MAs) and long-lived fission products (LLFPs), a new experimental instrument named "Accurate Neutron-Nucleus Reaction measurement Instrument (ANNRI)" has been constructed in the Materials and Life science experimental Facility (MLF) at the Japan Proton Accelerator Research Complex (J-PARC), and measurements of neutron-capture cross sections of MAs, LLFPs and some stable isotopes with high intensity pulsed neutrons have been started. The analyses for $$^{244}$$Cm, $$^{246}$$Cm, $$^{241}$$Am and $$^{237}$$Np were finished; those for $$^{129}$$I, $$^{107}$$Pd, $$^{99}$$Tc, $$^{93}$$Zr and some stable isotopes are in progress. These results will make significant contributions in the field of developing innovative nuclear systems.

論文

Influence of indentation on the critical current of Nb$$_{3}$$Sn strands

諏訪 友音; 名原 啓博; 高橋 良和; 押切 雅幸; 堤 史明; 渋谷 和幸*; 布谷 嘉彦; 村上 幸伸*; 宮下 克己*; Sim, K.-H.*; et al.

Physics Procedia, 67, p.908 - 913, 2015/07

https://doi.org/10.1016/j.phpro.2015.06.153
 被引用回数：9 パーセンタイル：90.78(Physics, Applied)

Japan Atomic Energy Agency is procuring all of the Nb$$_{3}$$Sn cable-in-conduit conductors for ITER Central Solenoid (CS). The $$T_{cs}$$ of short-twist-pitch (STP) conductors were stable under electromagnetic cycles because of the improvement in the bending property of STP cables. However, the short twist pitch increases the pressure between two strands at contact points, and strands become indented before the heat treatment for the reaction of Nb$$_{3}$$Sn. Therefore, the influence of indentations on the critical current ($$I_{c}$$) of Nb$$_{3}$$Sn strands need to be investigated. $$I_{c}$$ measurements were carried out for indented bronze-route (BR) and internal-tin (IT) Nb$$_{3}$$Sn strands. The $$I_{c}$$ were measured at 4.2 K and 12 T. When $$I_{c}$$ decreased 5%, the critical depths $$d_{c}$$ of the indentations were 0.26 mm and 0.37 mm for the BR and IT strands, respectively. The $$I_{c}$$ of both strand types decreased drastically with depth over dc. In order to maximize the superconducting properties of the Nb$$_{3}$$Sn cable, the depth of indentation should be smaller than dc in the cable.

論文

Behavior of Nb$$_{3}$$Sn cable assembled with conduit for ITER central solenoid

名原 啓博; 諏訪 友音; 高橋 良和; 辺見 努; 梶谷 秀樹; 尾関 秀将; 櫻井 武尊; 井口 将秀; 布谷 嘉彦; 礒野 高明; et al.

IEEE Transactions on Applied Superconductivity, 25(3), p.4200305_1 - 4200305_5, 2015/06

https://doi.org/10.1109/TASC.2014.2360562
 被引用回数：0 パーセンタイル：0.00(Engineering, Electrical & Electronic)

JAEA procures all superconductors for central solenoid (CS) in the ITER project. The cable is inserted into a conduit and compacted with it. During the insertion, the number of the rotation at the point ($$N_{p}$$) of the TF cable increased linearly to 50 against the inserted cable length ($$l_{i}$$). At first, $$N_{p}$$ of the CS cable also increased linearly by $$l_{i}$$ of 150 m. However, the increasing rate declined and the $$N_{p}$$ became constant to 30 at 600 m. During the compaction, the number of the rotation at the tail ($$N_{t}$$) of the CS cable increased linearly to 69 against the compacted cable length ($$l_{c}$$). It is important to measure not only $$N_{p}$$ but also $$N_{t}$$ because the rotation affects the twist pitch of the cable ($$l_{p}$$). After manufacturing the CS conductor, an X-ray transmission imaging made clear the $$l_{p}$$ along the whole length of the conductor for the first time. The $$l_{p}$$ peaked at the point; thus, a conductor sample should be taken there to investigate the effect of the $$l_{p}$$ elongation on the conductor performance.

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