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Polarized neutron reflectometer SHARAKU with 2-D MWPC in J-PARC

2次元MWPCを備えた偏極中性子反射率計「写楽」

山崎 大 ; 曽山 和彦 ; 宮田 登*; 笠井 聡*; 阿久津 和宏*; 花島 隆泰*; 久保田 正人; 青木 裕之 ; 鈴木 淳市*; 藤 健太郎 ; 中村 龍也 ; 山岸 秀志*; 坂佐井 馨 

Yamazaki, Dai; Soyama, Kazuhiko; Miyata, Noboru*; Kasai, Satoshi*; Akutsu, Kazuhiro*; Hanashima, Takayasu*; Kubota, Masato; Aoki, Hiroyuki; Suzuki, Junichi*; To, Kentaro; Nakamura, Tatsuya; Yamagishi, Hideshi*; Sakasai, Kaoru

試料垂直型偏極中性子反射率計「SHARAKU」では、薄膜試料の表面や界面で起こるoff-specular反射、Grazing angle SANSの測定を目指して2次元MWPC中性子検出器を整備している。MWPCは、0.5mmピッチのワイヤーによる個別読み出し方式を採用し、各々の信号ラインにASD-ASICを配置することで、高速・高効率を実現している。本実験では、BL17ビームラインにおいて、Ni/Ti多層膜を試料として中性子反射率実験を行った。その結果、1.8mmの空間分解能を確認し、qz-qx方向について明瞭なシグナルを記録した。本報告では、2次元MWPCの特性とその中性子反射率測定への応用について述べる。

Polarized neutron reflectometry is one of the powerful methods to investigate various phenomena on the surfaces and interfaces of a variety of films with layered structures such as magnetic materials. In this instrument, a two-dimensional position-sensitive neutron detection system consists of multi-wire proportional chamber (MWPC) with helium-3 gas and its data reduction software have been developed for the measurement of off-specular reflectivity and grazing incidence small-angle neutron scattering (GISANS). Each wire signal is read out by amplifier-shaper-discriminator (ASD) individually to meet with demands for a fast counting response and high spatial resolution for the measurement at intense pulsed neutron sources. The pitch between anode/cathode wires is 1.0 mm. The spatial resolution was 1.8 mm. We report characterization results of 2-D MWPC system at BL17 and its applications to neutron reflectivity measurements.

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