4.4 Article

YBCO and Bi2223 Coils for High Field LTS/HTS NMR Magnets: HTS-HTS Joint Resistivity

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2013.2243195

关键词

Coated YBCO conductor and Bi2223; high-temperature superconducting (HTS) magnet; HTS tape to HTS tape splicing technique; HTS-HTS splice resistivity

资金

  1. National Center for Research Resources of the National Institutes of Health
  2. National Institute of General Medical Sciences of the National Institutes of Health
  3. National Institute for Biomedical Imaging and Bioengineering of the National Institutes of Health

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This paper presents our latest experimental results on high-temperature superconducting (HTS) splice joints for HTS insert coils made of YBCO and Bi2223, that comprise a 1.3 GHz low-temperature superconducting/HTS nuclear magnetic resonance magnet currently under development at Francis Bitter Magnet Laboratory. HTS splice joint resistivity at 77 K in these insert coils must be reproducible and < 100 n Omega . cm(2). Several YBCO tape to YBCO tape (YBCO-YBCO) splice joint samples were fabricated, and their resistivity and I-c were measured at 77 K. First, we describe the joint splicing setup and discuss the parameters that affect joint resistivity: pressure over joint surface, solder, and YBCO spool batch. Second, we report results on YBCO-YBCO joints at 77 K in zero field. Measurements have shown that spool batch and solder are primary sources of a wide range of variation in YBCO-YBCO joint resistivity. By controlling these parameters, we expect to reproducibly achieve HTS-HTS resistive joints of resistance < 100 n Omega . cm(2).

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