Bi-2223 Innermost Coil for 1.03 GHz NMR Magnet
Applied Superconductivity, IEEE Transactions（2011）
摘要
Because of their high critical fields, high-Tc superconductors (HTS) are considered to be the only solution to dramatically increase the highest fields of NMR magnets. We have successfully demonstrated that a 500 MHz HTS/LTS NMR system with a Bi-2223 innermost coil could be used for solution NMR in a driven-mode operation. As the next step, the upgrade of the 920 MHz NMR system installed at the Tsukuba Magnet Laboratory is underway. The innermost Nb3Sn coil has been replaced by a Bi-2223 coil. The coil was fabricated as a layer-wound coil using five Bi-2223 conductors reinforced with bronze tapes. It was connected in series with the outer Nb3Sn and NbTi coils. The magnet is expected to generate a field of 24.2 T (1.03 GHz of 1H resonance frequency) at an operating current of 244.4 A. The test using the Bi-2223 coil and the outer Nb3Sn coils in combination was successfully carried out. The coil has been installed in the 1.03 GHz NMR magnet. Its cooling and operation are scheduled to take place within Fiscal Year 2010.
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关键词
bismuth compounds,calcium compounds,high-temperature superconductors,lead compounds,niobium alloys,nuclear magnetic resonance,strontium compounds,superconducting coils,superconducting critical field,superconducting magnets,superconducting tapes,tin alloys,titanium alloys,type ii superconductors,(bipb)2sr2ca2cu3o10,bi-2223 conductors,bi-2223 innermost coil,hts/lts nmr system,nmr magnet,nb3sn,nbti,tsukuba magnet laboratory,bronze tapes,critical fields,current 244.4 a,frequency 1.03 ghz,frequency 500 mhz,frequency 920 mhz,layer-wound coil,magnetic flux density 24.2 t,bi-2223,nmr spectrometer,high-field magnet,hoop stress,high temperature superconductors,high temperature superconductor
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