R&amp;D Efforts Towards High Field Accelerator Magnets at KEK

Nakamoto, T.; M, Iio; Jin, Xinzhe; Ogitsu, T.; Sasaki, Κ.; Terashima, A.; Tsuchiya, K.; Xu, Qingjin; Yamamoto, A.; Yoshida, Makoto; Kikuchi, A.; Takeuchi, T.; Nakagawa, Kazuma; Amemiya, Naoyuki

doi:10.1109/tasc.2011.2174589

Cited by 5 publications

(3 citation statements)

References 16 publications

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“…The development of a high-field superconducting magnets has lead to much research in areas such as NMR and accelerator [1][2][3][4][5][6]. It is known that a more detailed structure of a sample can be observed by using a high-field NMR system and high-resolution accelerators have played an important in the development of high-field magnet systems.…”

Section: Recent Randd On Superconducting Wiresmentioning

confidence: 99%

Recent R&D on Superconducting Wires for High-Field Magnet

Jin¹,

Nakamoto

Tsuchiya

et al. 2014

MSF

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Development for superconducting wires of materials such as Nb3Al and the high-temperature superconductors (HTS such as REBCO, Bi2223, and Bi2212) has been carried out for high-field magnet applications. It is known that these types of wire exhibit very different characteristics and performance for different applications. The development of Nb3Al wire for high-field accelerator magnet has resulted in remarkable achievements in critical current using a Rapid Heating and Quenching (RHQ) method by High Energy Accelerator Research Organization (KEK) and National Institute for Materials Science (NIMS). As one example of a characteristic of Nb3Al, the strain sensitivity of the critical current in the RHQ-Nb3Al wire is better than that of Nb3Sn wire. A strain study is needed to further the development of a high-filed magnet; therefore, we have carried out experimental studies using the neutron diffractometer at J-PARC Takumi. Researchers have recently achieved the highest critical current density for REBCO wires in a high-field above 15 T. For this reason, REBCO wire has been considered for high-field magnet NMR applications in Riken. But several obstacles remain, including coil degradation, shielding current and thermal runaway. In this paper, R&D on recent advances for applications will be presented.

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Section: Recent Randd On Superconducting Wiresmentioning

confidence: 99%

Recent R&D on Superconducting Wires for High-Field Magnet

Jin¹,

Nakamoto

Tsuchiya

et al. 2014

MSF

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“…The wires with 222 filaments have a partial interfilamentary Ta matrix. The Ta + Nb matrix to filament volume ratio is 0.8 [1,6]. The RHQ treatment has been performed at the National Institute for Materials Science (NIMS).…”

Section: A the Samplesmentioning

confidence: 99%

“…HE Nb 3 Al phase in superconducting wires for high field magnets [1] is produced during a Rapid Heating Quenching and Transformation (RHQT) process. Unlike the diffusion process, the RHQT process can produce nearly stoichiometric Nb 3 Al with small grains [2].…”

Section: Introductionmentioning

confidence: 99%

Transformation Heat Treatment of Rapidly Quenched $ \hbox{Nb}_{3}\hbox{Al}$ Precursor Monitored In Situ by High Energy Synchrotron Diffraction

Scheuerlein

Ballarino

Michiel

et al. 2013

IEEE Trans. Appl. Supercond.

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Nb3Al superconductors are studied for use in high field magnets. Fine grained Nb3Al with nearly stoichiometric Al content is obtained by a Rapid Heating Quenching and Transformation (RHQT) process. We describe a non destructive in situ study of the transformation process step of a RHQ Nb3Al precursor wire with ramp rates of either 120 °C/h or 800 °C/h. High energy synchrotron x-ray diffraction measurements show the transformation from a Nb(Al)SS supersaturated solid solution into Nb3Al. When heating with a ramp rate of 120 °C/h a strong reduction of the Nb(Al)SS (110) This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. 2MPQ-06

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