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Journal Articles

Automated pulsed magnet system for neutron diffraction experiments at the Materials and Life Science Experimental Facility in J-PARC

Watanabe, Masao; Kihara, Takumi*; Nojiri, Hiroyuki*

Quantum Beam Science (Internet), 7(1), p.1_1 - 1_10, 2023/03

A pulsed magnet system has been developed as a new user-friendly sample environment equipment at the Materials and Life Science Experimental Facility in Japan Proton Accelerator Research Complex. It comprises a vacuum chamber, a 4 K closed-cycle refrigerator for samples, and a nitrogen bath made of a stainless-steel tube with a miniature solenoidal coil. The coil is cooled by liquid nitrogen supplied by an automatic liquid nitrogen supply system, and the sample is cooled by a refrigerator. This combination facilitates the automatic high magnetic field diffraction measurement for the user's operation. A relatively large scattering angle is up to 42 degrees, which is significantly wider than the previous setup. Neutron diffraction experiments were performed on a multiferroic TbMnO$$_{3}$$ and the field dependence of the diffraction peaks was clearly observed. The new pulsed magnet system was established for a practical high magnetic field diffraction for the user program.

Journal Articles

Magnetic structures and quadratic magnetoelectric effect in LiNiPO$$_{4}$$ beyond 30 T

Fogh, E.*; Kihara, Takumi*; Toft-Petersen, R.*; Bartkowiak, M.*; Narumi, Yasuo*; Prokhnenko, O.*; Miyake, Atsushi*; Tokunaga, Masashi*; Oikawa, Kenichi; S${o}$rensen, M. K.*; et al.

Physical Review B, 101(2), p.024403_1 - 024403_12, 2020/01

 Times Cited Count:14 Percentile:71.84(Materials Science, Multidisciplinary)

Journal Articles

Development of compact high field pulsed magnet system for new sample environment equipment at MLF in J-PARC

Watanabe, Masao; Nojiri, Hiroyuki*; Ito, Shinichi*; Kawamura, Seiko; Kihara, Takumi*; Masuda, Takatsugu*; Sahara, Takuro*; Soda, Minoru*; Takahashi, Ryuta

JPS Conference Proceedings (Internet), 25, p.011024_1 - 011024_5, 2019/03

Recently, neutron scattering experiments have been rapidly progressed under high magnetic field. In the J-PARC, proto-type compact pulse magnet system with the power supply, the coil and the sample stick has been developed. Basic specifications of the power supply are as follows; maximum charged voltage with capacitor is 2 kV, maximum current is 8 kA, repetition rate is a pulse per several minutes and pulse duration is several msec. Maximum magnetic field in the coil is more than 30 Tesla. The sample stick is designed for Orange-Cryostat. In this presentation, We report the details of the pulsed magnet system and the performance of it on neutron scattering experiments at MLF beam line (HRC).

Oral presentation

Development of pulsed magnet system in J-PARC MLF

Watanabe, Masao; Nojiri, Hiroyuki*; Ito, Shinichi*; Kawamura, Seiko; Kihara, Takumi*; Masuda, Takatsugu*; Sahara, Takuro*; Soda, Minoru*; Takahashi, Ryuta

no journal, , 

Recently, neutron and radiation beam scattering experiments have been rapidly progressed under high magnetic field more than a few tens Tesla. In the J-PARC MLF, proto-type compact pulse magnet system has been developed for the user's request. The pulsed magnet system consist of (1) a capacitor bank power supply, (2) a small solenoid coil and (3) a cryostat-insert. The capacitor bank power supply is movable using casters in order to be used for each beam-line. Superconducting DC magnet up to 17 T has already developed for neutron scattering experiments, so we made the coil which generate higher magnetic fields up to 30 T. We developed a cryostat-insert for Orange-cryostat which has often been used in neutron experiments. In this presentation, we report measurement results of characteristics of the pulsed magnet system in high resolution chopper spectrometer (HRC).

Oral presentation

Development and application of pulsed magnet system up to 30 tesla for neutron scattering experiment

Watanabe, Masao; Nojiri, Hiroyuki*; Kihara, Takumi*

no journal, , 

Superconducting DC magnet up to 17 Tesla has developed for neutron scattering experiments. Although the sample environment team in the MLF have several DC superconducting magnets up to 7 Tesla as a sample environment apparatus, some users have requested the preparation of higher field magnets. However, another magnet technology is needed to generate higher than 20 Tesla. However, it is difficult to construct such a large system in the MLF from the point of view of construction space. It is practical to employ a pulsed magnetic field as it enables operation of smaller energy as well as downsizing of the instruments. Therefore, we have been newly developed a compact and transportable pulsed magnet system up to 30 Tesla.

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