• Open Access

Design, fabrication, and characterization of a high-field high-temperature superconducting Bi-2212 accelerator dipole magnet

Tengming Shen, Laura Garcia Fajardo, Cory Myers, Aurelio Hafalia, Jr., Jose Luis Rudeiros Fernández, Diego Arbelaez, Lucas Brouwer, Shlomo Caspi, Paolo Ferracin, Stephen Gourlay, Maxim Marchevsky, Ian Pong, Soren Prestemon, Reed Teyber, Marcos Turqueti, Xiaorong Wang, Jianyi Jiang, Ernesto Bosque, Jun Lu, Daniel Davis, Ulf Trociewitz, Eric Hellstrom, and David Larbalestier
Phys. Rev. Accel. Beams 25, 122401 – Published 7 December 2022

Abstract

The use of high-field superconducting magnets has furthered the development of medical diagnosis, fusion research, accelerators, and particle physics. High-temperature superconductors enable magnets more powerful than those possible with Nb-Ti (superconducting transition temperature Tc of 9.2 K) and Nb3Sn (Tc of 18.4 K) conductors due to their very high critical field Bc2 of greater than 100 T near 4.2 K. However, the development of high-field accelerator magnets using high-temperature superconductors is still at its early stage. We report the construction of the world’s first high-temperature superconducting Bi2Sr2CaCu2Ox (Bi-2212 with Tc of 82K) accelerator dipole magnet. The magnet is based on a canted-cosine-theta design with Bi-2212 Rutherford cables. A high critical current was achieved by an overpressure processing heat treatment. The magnet was constructed from a nine-strand Rutherford cable made from industrial 0.8 mm wires. At 4.2 K, it reached a quench current of 3600 A and a dipole field of 1.64 T in a bore of 31 mm. The magnet did not exhibit the undesirable quench training common in Nb-Ti and Nb3Sn accelerator magnets. It quenched a dozen times without degradation. The magnet exhibited low magnetic field hysteresis (<0.1%) as measured by a cryogenic Hall sensor. It was fast cycled to 1.47 T at 0.54T/s without quenches. This work validates the canted-cosine-theta Bi-2212 dipole magnet design, illustrates the fabrication scheme, and establishes an initial performance benchmark.

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  • Received 15 June 2022
  • Accepted 10 October 2022

DOI:https://doi.org/10.1103/PhysRevAccelBeams.25.122401

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Accelerators & Beams

Authors & Affiliations

Tengming Shen1,*, Laura Garcia Fajardo2, Cory Myers1, Aurelio Hafalia, Jr.2, Jose Luis Rudeiros Fernández1, Diego Arbelaez2, Lucas Brouwer1, Shlomo Caspi2, Paolo Ferracin1, Stephen Gourlay1, Maxim Marchevsky1, Ian Pong1, Soren Prestemon2, Reed Teyber1, Marcos Turqueti2, Xiaorong Wang1, Jianyi Jiang3, Ernesto Bosque3, Jun Lu3, Daniel Davis3, Ulf Trociewitz3, Eric Hellstrom3, and David Larbalestier3

  • 1Accelerator Technology and Applied Physics Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 2Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 3Applied Superconductivity Center, National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA

  • *Corresponding author. tshen@lbl.gov

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Issue

Vol. 25, Iss. 12 — December 2022

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