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Development of a superconducting magnet for relativistic backward-wave oscillator

  • 1.

    High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China

  • 2.

    School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China

Funds:  Supported by the Anhui Provincial Natural Science Foundation (1408085QE90).
Cite this:
https://doi.org/10.3969/j.issn.0253-2778.2016.12.004
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  • Corresponding author: HUANG Pengcheng (corresponding author), male, born in 1986, PhD. Research field: Superconducting magnet.
  • Received Date: 18 May 2016
  • Accepted Date: 18 November 2016
  • Rev Recd Date: 18 November 2016
  • Publish Date: 30 December 2016
    Abstract

  • Abstract

    A homogeneous magnetic field superconducting magnet with a room-temperature bore of 30 mm and a central field of 551 T for relativistic backward-wave oscillator was designed, manufactured and tested. As a result of magnetic field homogeneity considerations, the magnet is composed of three coaxial coils. All coils are connected in series and charged with a single power supply. The magnetic field homogeneity is better than ±05% from -30 mm to 30 mm in axial direction. The magnet can be operated in persistent mode with a superconducting switch. In addition, a pair of HTS current leads and a two-stage GM cryocooler with cooling capacity of 15 W at 42 K were adopted to realize a zero liquid helium boil-off. Here the design, manufacture, mechanical behavior analysis, and the test results of the magnet were presented.

    Abstract

    A homogeneous magnetic field superconducting magnet with a room-temperature bore of 30 mm and a central field of 551 T for relativistic backward-wave oscillator was designed, manufactured and tested. As a result of magnetic field homogeneity considerations, the magnet is composed of three coaxial coils. All coils are connected in series and charged with a single power supply. The magnetic field homogeneity is better than ±05% from -30 mm to 30 mm in axial direction. The magnet can be operated in persistent mode with a superconducting switch. In addition, a pair of HTS current leads and a two-stage GM cryocooler with cooling capacity of 15 W at 42 K were adopted to realize a zero liquid helium boil-off. Here the design, manufacture, mechanical behavior analysis, and the test results of the magnet were presented.
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    • References(12)
  • [1]
    VLASOV A N, ILYIN A S, CARMEL Y, et al. Cyclotron effects in relativistic backward-wave oscillators operating at low magnetic fields[J]. IEEE Trans Plasma Sci, 1998, 26: 605-614.
    [2]
    CHEN C, LIU G. Effects of axial guiding magnetic field on microwave power of backward-wave oscillators[J]. High Power Laser and Particle Beams, 2000, 12: 745-748.
    [3]
    CHEN C, LIU G, HUANG W, et al. A repetitive X-band relativistic backward-wave oscillator[J]. IEEE Trans Plasma Sci, 2000, 25: 1 108-1 111.
    [4]
    REN Y, WANG F, CHEN W, et al. Development of a superconducting magnet system for microwave application[J]. IEEE Trans Appl Supercond, 2010, 20(3): 1 912-1 915.
    [5]
    LVOVSKY Y, STAUTNER W, ZHANG T. Novel technologies and configurations of superconducting magnets for MRI[J]. Supercond Sci Technol, 2013, 26(9): 093001.
    [6]
    HIROSE R, KAMIKADO T, OKUI Y, et al. Development of 7 T cryogen-free superconducting magnet for gyrotron[J]. IEEE Trans Appl Supercond, 2008, 12: 920-923.
    [7]
    WANG Q, DAI Y, ZHAO B, et al. Design of superconducting magnet for background magnetic field[J]. IEEE Trans Appl Supercond, 2008, 18(2): 548-551.
    [8]
    CHOI Y S, KIM D L, LEE B S, et al. Conduction-cooled superconducting magnet for material control application[J]. IEEE Trans Appl Supercond, 2009, 19(3): 2 190-2 193.
    [9]
    ZHANG X, REN Y, WANG F, et al. Development of a superconducting magnet system with zero liquid helium boil-off[J]. J Supercond Novel Magn, 2014, 27(4): 1 027-1 030.
    [10]
    YAMASHITA T, NISHIJIMA S, TAKAHATA K, et al. Instability of impregnated windings induced by epoxy cracking[J]. IEEE Trans Magn, 1989, 25(2): 1 524-1 527.
    [11]
    WANG Q, DAI Y, ZHAO B, et al. Development of large-bore superconducting magnet with zero-vapor liquid helium[J]. IEEE Trans Appl Supercond, 2008, 18: 787-790.
    [12]
    CHEN P, DAI Y, WANG Q, et al. Mechanical behavior analysis of a 1 MJ SEMS magnet[J]. IEEE Trans Appl Supercond, 2010, 20(3): 1 916-1 919.
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    [1]
    VLASOV A N, ILYIN A S, CARMEL Y, et al. Cyclotron effects in relativistic backward-wave oscillators operating at low magnetic fields[J]. IEEE Trans Plasma Sci, 1998, 26: 605-614.
    [2]
    CHEN C, LIU G. Effects of axial guiding magnetic field on microwave power of backward-wave oscillators[J]. High Power Laser and Particle Beams, 2000, 12: 745-748.
    [3]
    CHEN C, LIU G, HUANG W, et al. A repetitive X-band relativistic backward-wave oscillator[J]. IEEE Trans Plasma Sci, 2000, 25: 1 108-1 111.
    [4]
    REN Y, WANG F, CHEN W, et al. Development of a superconducting magnet system for microwave application[J]. IEEE Trans Appl Supercond, 2010, 20(3): 1 912-1 915.
    [5]
    LVOVSKY Y, STAUTNER W, ZHANG T. Novel technologies and configurations of superconducting magnets for MRI[J]. Supercond Sci Technol, 2013, 26(9): 093001.
    [6]
    HIROSE R, KAMIKADO T, OKUI Y, et al. Development of 7 T cryogen-free superconducting magnet for gyrotron[J]. IEEE Trans Appl Supercond, 2008, 12: 920-923.
    [7]
    WANG Q, DAI Y, ZHAO B, et al. Design of superconducting magnet for background magnetic field[J]. IEEE Trans Appl Supercond, 2008, 18(2): 548-551.
    [8]
    CHOI Y S, KIM D L, LEE B S, et al. Conduction-cooled superconducting magnet for material control application[J]. IEEE Trans Appl Supercond, 2009, 19(3): 2 190-2 193.
    [9]
    ZHANG X, REN Y, WANG F, et al. Development of a superconducting magnet system with zero liquid helium boil-off[J]. J Supercond Novel Magn, 2014, 27(4): 1 027-1 030.
    [10]
    YAMASHITA T, NISHIJIMA S, TAKAHATA K, et al. Instability of impregnated windings induced by epoxy cracking[J]. IEEE Trans Magn, 1989, 25(2): 1 524-1 527.
    [11]
    WANG Q, DAI Y, ZHAO B, et al. Development of large-bore superconducting magnet with zero-vapor liquid helium[J]. IEEE Trans Appl Supercond, 2008, 18: 787-790.
    [12]
    CHEN P, DAI Y, WANG Q, et al. Mechanical behavior analysis of a 1 MJ SEMS magnet[J]. IEEE Trans Appl Supercond, 2010, 20(3): 1 916-1 919.
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