Test results of a Nb₃Al/Nb₃Sn subscale magnet for accelerator application

Journal Article · Wed Jan 28 00:00:00 EST 2015 · IEEE Transactions on Applied Superconductivity

DOI:https://doi.org/10.1109/TASC.2015.2390074· OSTI ID:1214566

Iio, Masami ^[1]; Xu, Qingjin ^[1]; Nakamoto, Tatsushi ^[1]; Sasaki, Ken -ichi ^[1]; Ogitsu, Toru ^[1]; Yamamoto, Akira ^[1]; Kimura, Nobuhiro ^[1]; Tsuchiya, Kiyosumi ^[1]; Sugano, Michinaka ^[1]; Enomoto, Shun ^[1]; Higashi, Norio ^[1]; Terashima, Akio ^[1]; Tanaka, Kenichi ^[1]; Okada, Ryutaro ^[1]; Takahashi, Naoto ^[1]; Ikemoto, Yukiko ^[1]; Kikuchi, Akihiro ^[1]; Takeuchi, Takao ^[1]; Sabbi, Gianluca ^[1]; Zlobin, Alexander ^[1] ; Barzi, Emanuela ^[1]

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1. High Energy Acceleration Research Organization (KEK), Tsukuba (Japan)

The High Energy Accelerator Research Organization (KEK) has been developing a Nb₃Al and Nb₃Sn subscale magnet to establish the technology for a high-field accelerator magnet. The development goals are a feasibility demonstration for a Nb₃Al cable and the technology acquisition of magnet fabrication with Nb₃Al superconductors. KEK developed two double-pancake racetrack coils with Rutherford-type cables composed of 28 Nb₃Al wires processed by rapid heating, quenching, and transformation in collaboration with the National Institute for Materials Science and the Fermi National Accelerator Laboratory. The magnet was fabricated to efficiently generate a high magnetic field in a minimum-gap common-coil configuration with two Nb₃Al coils sandwiched between two Nb₃Sn coils produced by the Lawrence Berkeley National Laboratory. A shell-based structure and a “bladder and key” technique have been used for adjusting coil prestress during both the magnet assembly and the cool down. In the first excitation test of the magnet at 4.5 K performed in June 2014, the highest quench current of the Nb₃Sn coil, i.e., 9667 A, was reached at 40 A/s corresponding to 9.0 T in the Nb₃Sn coil and 8.2 T in the Nb₃Al coil. The quench characteristics of the magnet were studied.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC02-05CH11231; AC02-76CH03000
• OSTI ID: 1214566
• Journal Information: IEEE Transactions on Applied Superconductivity, Vol. 25, Issue 3; ISSN 1051-8223
• Publisher: Institute of Electrical and Electronics Engineers (IEEE)
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
bladder and key
common coil
high field magnet
Nb3Al
shell based structure