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Vu, TheDang; 宍戸 寛明*; 相澤 一也; 小嶋 健児*; 小山 富男*; 及川 健一; 原田 正英; 奥 隆之; 曽山 和彦; 宮嶋 茂之*; et al.
Nuclear Instruments and Methods in Physics Research A, 1006, p.165411_1 - 165411_8, 2021/08
被引用回数：1 パーセンタイル：18.12(Instruments & Instrumentation)We found that the sizes of the Gd islands determined from the transmission image correlated strongly with those determined from the SEM image. We demonstrated the CB-KID could be used to identify (1) tiny voids in a thermally sprayed continuous Gd
O
film in and (2) various mosaic morphologies and different eutectic microstructures in Wood's metal samples. The fact that the CB-KID system could be used to identify features of samples with a wide distribution of sizes and thicknesses is promising for real application of the device for imaging samples of interest to material scientists. Operating the CB-KID at higher temperatures appreciably improved the efficiency for simultaneously identifying the X and Y positions of hotspots. We also compared the detection efficiency with the PHITS simulations. We now plan to improve the detection efficiency by increasing the thickness of the 
B neutron conversion layer
Vu, TheDang; 宍戸 寛明*; 小嶋 健児*; 小山 富男*; 及川 健一; 原田 正英; 宮嶋 茂之*; 奥 隆之; 曽山 和彦; 相澤 一也; et al.
Superconductor Science and Technology, 34(1), p.015010_1 - 015010_10, 2021/01
被引用回数：3 パーセンタイル：26.56(Physics, Applied)We demonstrated that a four-readout superconducting neutron imaging system shows good spatial heterogeneity and linearity using the delay-line method. We examined the precise pattern of a B-dot-array absorber and found the X-direction pitch (Px) = 250.7 um with a scatter of (Hx)= 5.4 um and the Y-direction pitch (Py)= 249.1 um with a scatter of (Hy)= 3.4 um while the B dot array was fully extended toward the X direction across the detector sensitive area. We consider that this demonstrates detection with good spatial homogeneity and conclude. The transmission-imaging system is suitable for use at pulsed neutron facilities. We also reported a clear transmission image of tiny screws and nuts, and ladybug (insect). We recognize that further efforts to improve the detection efficiency are necessary to make using the detector more practical.
Vu, TheDang; 西村 和真*; 宍戸 寛明*; 原田 正英; 及川 健一; 宮嶋 茂之*; 日高 睦夫*; 奥 隆之; 曽山 和彦; 相澤 一也; et al.
Journal of Physics; Conference Series, 1590, p.012036_1 - 012036_9, 2020/07
被引用回数：0 パーセンタイル：0.01(Engineering, Electrical & Electronic)Our CB-KID neutron imager detects high spatial resolution neutrons transmission images by using a delay-line technique. We found that the number of events was remarkably increased with increasing the detector temperature until close to the critical temperature Tc. We investigated the properties of CB-KID at near Tc. We observed systematic changes of neutron signals as a function of the detector temperature from 4 K to Tc. The simulations modeled the sequential physical processes for B(n,
)
Li reactions and energy deposition by particles within CB-KID, including neutrons, 
He particles, Li particles, photon and electron transport.
B conversion layer宮嶋 茂之*; 宍戸 寛明*; 鳴神 吉人*; 吉岡 直人*; 藤巻 朗*; 日高 睦夫*; 及川 健一; 原田 正英; 奥 隆之; 新井 正敏*; et al.
Nuclear Instruments and Methods in Physics Research A, 842, p.71 - 75, 2017/01
被引用回数：13 パーセンタイル：77.73(Instruments & Instrumentation)We successfully derived the time-dependent flux of pulsed neutrons using a superconducting Nb-based current biased kinetic inductance detector (CB-KID) with a B conversion layer at Japan Proton Accelerator Research Complex. Our CB-KID is a meander line made of a 40-nm-thick Nb thin film with 1-
m line width, which is covered with a 150-nm-thick B conversion layer. The detector works at a temperature below 4 K. The evaluated detection efficiency of the CB-KID in this experiment is 0.23% at the neutron energy of 25.4 meV. The time-dependent flux spectra of pulsed neutrons thus obtained are in good agreement with the results obtained by the Monte Carlo simulations.
B
O
crystal中村 龍也; 片桐 政樹; Chen, Y. E.*; 浮辺 雅宏*; 大久保 雅隆*
Nuclear Instruments and Methods in Physics Research A, 559(2), p.766 - 768, 2006/04
被引用回数：13 パーセンタイル：65.77(Instruments & Instrumentation)LiBO単結晶上に製作した2つの超伝導トンネル接合素子(STJ)フォノンセンサによる波高相関型中性子イメージング検出器の開発を進めている。本検出器では、単結晶基盤の構成元素である
LiあるいはBと中性子の核反応の結果生じる励起フォノンを結晶表面に製作されたSTJ素子により計測することで中性子を検出し、2つの素子からの波高相関により入射位置を決定する。熱中性子に対してほぼ100%の検出効率、低バックグランド、数10mの位置分解能、数sの時間応答、耐放射線性が期待できる。今回われわれは試作した検出器の特性を冷中性子ビームを用いて検証した。その結果、製作した二つのSTJ素子の波高相関測定から位置検出可能であることを確認したので報告する。
ray by a neutron detector comprising a superconducting tunnel junction on a single crystal of LiBO中村 龍也; 片桐 政樹; 曽山 和彦; 浮辺 雅宏*; 池内 隆志*; 大久保 雅隆*
Nuclear Instruments and Methods in Physics Research A, 529(1-3), p.402 - 404, 2004/08
被引用回数：8 パーセンタイル：48.76(Instruments & Instrumentation)LiBO単結晶上に製作した超伝導トンネル接合素子(STJ)による低温中性子検出器の中性子/線弁別性能を評価した。本検出器はLiあるいはBでの中性子核反応の結果励起される多数の低エネルギーフォノンを単結晶表面に製作されたSTJ素子により測定することで中性子を検出する。本検出器のX線(5.9keV),線(1.17, 1.33MeV)、及び中性子に対する放射線応答特性を詳細に測定した結果、STJ素子のフォノン検出信号波形の立ち上がり時間が放射線種により異なることを初めて明らかにし、この特徴を利用することで線,X線などのバックグランド信号と中性子信号とを簡便に弁別できることを確認した。
