Field Stability Analysis of 25 T Cryogen-Free Superconducting Magnet and Upgrade Plans for 30 T System at HFLSM, IMR, Tohoku University

Satoshi Awaji, Yuto Imai, Kohki Takahashi, Tatsunori Okada, Arnaud Badel, Hiroshi Miyazaki, Satoshi Hanai, Shigeru Ioka

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Magnetic field stability and hysteresis can be serious problems in a high-field high-temperature superconducting magnet, because of the large shielding current effect. Accordingly, the field stability of a 25 T cryogen-free superconducting magnet (25T-CSM) was investigated. This particular system can generate a central field of 24.6 T in a 52-mm room-temperature bore. It was found that the magnetic field relaxation rate of the 25T-CSM with a Bi2Sr2Ca2Cu3Oy (Bi2223) insert was due to the flux creep effect, and was small enough to allow nuclear magnetic resonance (NMR) experiments. Based on these experiences in the development of the 25T-CSM, primitive designs for a 30 T cryogen-free superconducting magnet (30T-CSM) were suggested based on upgrading the present Bi2223 insert to a REBa2Cu3Oy (RE123, RE: rare earth and Yttrium) insert incorporating two co-wound RE123 tapes. It was confirmed that the prototype test coil could be operated at 4.2 K under large electromagnetic stresses of up to 540 MPa without experiencing degradation.

Original languageEnglish
Article number4300305
JournalIEEE Transactions on Applied Superconductivity
Volume29
Issue number5
DOIs
Publication statusPublished - 2019 Aug

Keywords

  • Electromagnetic stress
  • high temperature superconductor
  • magnetic field stability
  • quench
  • superconducting coil

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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