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Publications (5)5.73 Total impact

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    ABSTRACT: A 40-T hybrid magnet under construction at the High Magnetic Field Laboratory of the Chinese Academy of Sciences will use cable-in-conduit conductors for its superconducting outsert. The design necessitates the use of high current density (J<sub>c</sub>) Nb<sub>3</sub>Sn strands (J<sub>c</sub> ≥ 2100 A/mm<sup>2</sup> at 12 T/4.2 K). The high J<sub>c</sub> restacked-rod-processed Nb<sub>3</sub>Sn strand from Oxford Instruments Superconductor Technology was selected as one of the candidate strands. A series of tests was carried out to qualify the strand performance. Tests mainly included magnetization and critical current measurements as a function of axial strain, magnetic fields, and temperature. The test results are presented and discussed.
    IEEE Transactions on Applied Superconductivity 09/2011; · 1.20 Impact Factor
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    ABSTRACT: Two kinds of Nb<sub>3</sub>Sn CICC joints have been designed for the superconducting coils of the 40 T hybrid magnet. The “terminal joint” is for the joints between the terminals of the superconducting coils. The “interlayer joint” is for the joints between the layers of the coils. Both the terminal joint and the interlayer joint are fabricated before heat treatment. The interlayer joint is not processed any more after heat treatment. The copper soles of the terminal joints are attached to each other with PbSn solder to join the superconducting coils to each other and to the current leads that connect to the power supply. Two full-size joints are being manufactured and will be tested in the High Magnetic Field Laboratory, Chinese Academy of Sciences (CHMFL). This paper will describe an overview of the joints' design and fabrication, and the predicted joint resistances will be also presented.
    IEEE Transactions on Applied Superconductivity 07/2011; · 1.20 Impact Factor
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    ABSTRACT: A cryogenic test facility for a superconducting magnet has been constructed at the Institute of Plasma Physics, Chinese Academy of Science. A measurement system was set up to obtain quench signals and parameters in the test program, such as cryogenic hydraulic performances and electromagnetic characteristics. Thirty superconducting magnets in the Experimental Advanced Superconducting Tokamak device and a number of other magnets have been tested in the test system successfully. The design of the measurement system is introduced from the point of view of engineering practice. The measurement method of some parameters is also discussed in detail. The highlight lies in type selection installation techniques and instrumentation of sensors.
    IEEE Transactions on Applied Superconductivity 11/2010; · 1.20 Impact Factor
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    ABSTRACT: The High Magnetic Field Laboratory of the Chinese Academy of Sciences will develop a 40-T hybrid magnet. The superconducting outsert, which consists of a NbTi coil and a Nb<sub>3</sub> Sn coil, will provide more than 11 T of central field in a 580-mm bore. The superconducting coils will be wound of cable-in-conduit conductor (CICC) and cooled by flowing 4.5-K supercritical helium. A model coil of the Nb<sub>3</sub>Sn coil has been designed and will be manufactured to develop the technology of cabling, jacketing, winding, heat treatment, etc., and the model coil can also simulate the performance of the Nb<sub>3</sub>Sn superconducting coil under its operating conditions. This paper gives an overview of the conceptual design for the model coil and predicts its current-sharing temperature (Tcs).
    IEEE Transactions on Applied Superconductivity 01/2010; · 1.20 Impact Factor
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    ABSTRACT: A model coil for a 40 T hybrid magnet was designed and manufactured at the High Magnetic Field Laboratory of the Chinese Academy of Sciences (CHMFL); the model coil was wound with Nb3Sn cable-in-conduit-conductors (CICC) and cooled with 4.5 K supercritical helium. The performance of the model coil was tested, and the performance tests included a DC charging test, AC losses test, temperature margin test, cyclic load test, and fast discharge test. The AC losses produced in the different operation scenarios of the tests were simulated and analyzed by a modified Gandalf code. The simulated AC losses will be presented and compared with the test results in this paper.
    Journal of Superconductivity and Novel Magnetism 25(5). · 0.93 Impact Factor