Physical Review Accelerators and Beams (Dec 2022)

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,
  • David Larbalestier

DOI
https://doi.org/10.1103/PhysRevAccelBeams.25.122401
Journal volume & issue
Vol. 25, no. 12
p. 122401

Abstract

Read online Read online

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 T_{c} of 9.2 K) and Nb_{3}Sn (T_{c} of 18.4 K) conductors due to their very high critical field B_{c2} 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 Bi_{2}Sr_{2}CaCu_{2}O_{x} (Bi-2212 with T_{c} of ∼82 K) 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 Nb_{3}Sn 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 0.54 T/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.