期刊
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
卷 23, 期 3, 页码 -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
- National Center for Research Resources of the National Institutes of Health
- National Institute of General Medical Sciences of the National Institutes of Health
- National Institute for Biomedical Imaging and Bioengineering of the National Institutes of Health
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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