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石角 元志*; 高橋 竜太*; 山内 康弘*; 中村 雅俊*; 石丸 宙*; 山内 沙羅*; 河村 聖子; 吉良 弘*; 坂口 佳史*; 渡辺 真朗; et al.
JPS Conference Proceedings (Internet), 41, p.011010_1 - 011010_7, 2024/05
Recent status of cryogenic sample environment equipment at the Materials and Life Science Experimental Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC) has been reported. We have reviewed the specifications and performance of cryogenic sample environment equipment and a newly installed Gifford-McMahon (GM) cryofurnace, which are mainly managed by the Cryogenic and Magnet group in the sample environment team at the MLF. Moreover, the recent maintenance and update of each piece of equipment, the improved temperature-control function, and the expansion of the usable beamline of the cryogenic sample environment equipment are described.
金子 耕士; 田端 千紘; 萩原 雅人; 山内 宏樹; 大場 洋次郎; 熊田 高之; 久保田 正人; 児島 佑樹*; 生田目 望; 佐々木 未来; et al.
JPS Conference Proceedings (Internet), 41, p.011015_1 - 011015_6, 2024/03
We will introduce our recent update on low temperature system for neutron diffraction experiments. This is characterized by advantages such as liquid He free and sophisticated automatic temperature control functions, which can be a new standard for low temperature and high magnetic field experiments of neutron scattering.
長谷美 宏幸; 高橋 竜太*; 山内 康弘*; 石角 元志*; 河村 聖子; 小峰 良太
JPS Conference Proceedings (Internet), 41, p.011003_1 - 011003_5, 2024/03
The instrument control software framework "IROHA2" is used for the neutron and muon experiments at J-PARC MLF. IROHA2 consists of four core software components: i) The device control server controls and monitors devices, ii) the instrument management server authenticates users, manages measurements and configures device combinations, iii) the sequence management server builds and controls automatic measurements, iv) the integrate control server has centralized control over the device monitoring and measurement. Since IROHA2 is equipped with a web user interface, the control system can be accessed remotely using a web browser. MLF's sample environment team developed several device modules of the device control server in order to be able to use the sample environment equipment for automatic measurements. For example, the modules currently used in the experiments are those for 
He and 
He cryostats, superconducting magnets, niobium furnaces, and so on. In this presentation, we will introduce the features of IROHA2 and the functions of the device modules for the sample environment equipment.
宗像 孝司*; 長壁 豊隆
no journal, ,
10GPaの高圧力下で単結晶中性子回折実験を行うための技術開発について紹介する。まず、サファイアあるいはサポート型SiCアンビルとキュレットに窪みを持つWCアンビルを組み合わせたハイブリッドアンビル(HA)技術を開発し、10GPaの圧力発生に成功した。次に、高圧下単結晶回折実験に不可欠な高い静水圧性と低い圧縮率を持つ液体媒体を探索した結果、グリセリンが優れた特性を持つことを見出した。JRR-3におけるHAを用いた強相関電子系化合物の磁性研究、ISISやJ-PARC MLFへのHAの適用、また、ILLでの3次元偏極解析法へのHAの適用など、高圧物性研究を推進している。また、最近の取り組みとして、高圧下の中性子磁気回折と電気伝導の同時測定を目指して、HAで電気伝導を測定するための技術開発を実施している。
服部 高典; 佐野 亜沙美; 町田 真一*; 阿部 淳*; 舟越 賢一*; 岡崎 伸生*; 柿澤 翔*
no journal, ,
PLANETは、J-PARCの高圧実験専用中性子ビームラインである。このビームラインの最大の特徴は、6軸マルチアンビルプレス「ATSUHIME」を用いて、24GPa, 1200Kまでの高圧高温実験を行うことができることである。またもう一つの特徴は、細い入射スリットと、試料位置視野0.8
3.0mmをもつラジアルコリメータで散乱領域を見込むことで、ヒーターや高圧セルなど試料周囲の物質からの散乱を除去し、きれいな回折パターンを取得できることである。これにより、結晶だけでなく、液体や非晶質固体の精密な構造決定が可能である。さらに、より小さな試料を使用することができ、このことは実験可能な最高圧力の向上にも寄与している。2013年のビームライン稼働以来、高圧装置や高圧技術の開発を進め、現在では様々な高圧装置を用いて広いPT領域で粉末回折実験が可能になっている。本発表では、ビームラインの性能と最近の開発状況について、PLANETで得られた最近の成果とともに紹介する。
河村 聖子; 服部 高典; 神原 理*
no journal, ,
We have developed piston cylinder cells for the inelastic neutron scattering measurements at cold-neutron disk-chopper spectrometer, AMATERAS, in J-PARC. An Al alloy and a CuBe alloy were chosen as the cylinder material for experiments under pressures up to 0.5 and 1.5~GPa, respectively. A test measurement on a powder sample of a quantum spin system was performed using the Al alloy cell to evaluate the intensity of background and the 
-
region where it appears. Further experiment on an organic radical system was performed using the CuBe cell for a feasibility test to observe phonon spectra and magnetic excitations. The CuBe cell was set to a bottom-loading 
He cryostat and cooled down to 0.3~K. These cells are now open for users' experiments. We have also conducted the quasielastic neutron scattering measurement on water under pressures up to 0.8 GPa using a hybrid piston-cylinder cell. Currently we are developing a compact radial collimator, which can be set to a sample rod of a top-loading closed-cycle refrigerator together with the piston cylinder cell.
金子 耕士
no journal, ,
After nearly 10 years of shutdown, the Japanese research reactor 3, JRR-3, has been restarted on February 2022, and subsequently the user program has been resumed from July. Since then, the reactor was at stable operation, with 7 cycles per year. In line with the restart of the reactor, sample environments were also checked, and reused successfully. In addition, some equipments were renewed to fulfill demands of increased security and safety. This renewal includes the new dry magnet and sets of top-loading cryostats. We will report issues we faced at the restart, and the ongoing project.
