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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
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.
Watanabe, Masao; Nojiri, Hiroyuki*
Journal of Neutron Research, 21(1-2), p.39 - 45, 2019/05
Magnetic field acts directly on the spin and the orbital motion of electron in the material and interesting quantum phenomena and phase transition are found in high magnetic field. Recently, experimental equipments using neutron beams in high magnetic field have been rapidly developed. For example, superconducting DC magnet up to 17 T has developed for neutron scattering experiments. Although the sample environment team in the MLF have several DC superconducting magnets up to 7 T 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 T. 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 developed a compact and movable pulsed magnet system up to 30 T.
Oku, Takayuki; Watanabe, Masao; Kawamura, Seiko; Aso, Tomokazu; Takahashi, Ryuta*; Sakai, Kenji; Yamauchi, Yasuhiro*; Nakamura, Masatoshi*; Munakata, Koji*; Ishikado, Motoyuki*; et al.
no journal, ,
Sample environment (SE) team is organized at the MLF of the J-PARC. SE equipment are prepared and the users are supported by the SE team. SE team consists of sub-team of (1) low temperature & magnetic field, (2) high temperature, (3) high pressure, (4) soft matter, (5) pulsed magnet, (6) light irradiation, (7) 
He spin filter. In this presentation, we will present the current status of the sample environmental equipment, the future plan and the support activities for users.
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.
Watanabe, Masao; Nojiri, Hiroyuki*
no journal, ,
In recent years, there has been increasing requirements for experiments under a high magnetic field of several tens of Tesla using neutrons and synchrotron radiation. 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, users have requested the preparation of higher field magnets. Therefore, we have been newly developed a compact and transportable pulsed magnet system up to 30 Tesla.
Watanabe, Masao; Nojiri, Hiroyuki*
no journal, ,
In J-PARC MLF, we have been developing a compact and transportable pulsed magnet system as one of the sample environment equipment so that it can be installed in various beamlines. The developed pulsed magnet can generate up to 30 Tesla, can cool down to 4K with a GM refrigerator, and can handle up to room temperature using a heater. In this presentation, we will show the characteristics of the pulsed magnet, the result of a neutron scattering beam experiment. And also, we will show the plans of increasing the pulsed magnetic field up to 35 Tesla and long-pulse experiments.
Watanabe, Masao; Nojiri, Hiroyuki*
no journal, ,
In J-PARC MLF, we have been developing a transportable pulsed magnet system for high magnetic field up to 35 T as one of the sample environment equipment so that it can be used in various beamlines. We have newly developed a pulsed magnet system using a GM refrigerator in order to dramatically improve the convenience and practicality for users. And also, we have newly introduced an automatic liquid nitrogen supply equipment. In previous neutron scattering experiments, it was necessary to manually supply liquid nitrogen every a few hours, but with the introduction of the automatic liquid nitrogen supply equipment, it has become possible to operate automatically for several days in maximum. It consists of a vacuum chamber, a GM refrigerator, and a square SUS tube in which a solenoidal coil was inserted. In this presentation, we will report on the characteristics and current status of the pulsed magnet system up to 35 T.
investigated by time-of-flight neutron diffraction in long-pulse magnetic fieldsWatanabe, Masao; Nakajima, Taro*; Inamura, Yasuhiro; Matsui, Kazuki*; Kanda, Tomoki*; Nomoto, Tetsuya*; Oishi, Kazuki*; Kawamura, Yukihiko*; Saito, Hiraku*; Tamatsukuri, Hiromu; et al.
no journal, ,
In recent years, due to advances in precision measurement technology in pulsed magnetic fields, a novel magnetic state was discovered in a strong magnetic field. We constructed a measurement environment that can comprehensively explore the reciprocal lattice space under magnetic fields up to 14 Tesla by combining the long-pulse magnetic field generated by the supercapacitor and pulsed neutrons at J-PARC. This equipment can generate a magnetic field that is sufficiently longer than the time width (about 10 milliseconds) of the multi-wavelength neutron pulse passing through the sample. This method was used to investigate the magnetic phase transition in the frustrated magnet CuFeO.
