한국초전도ㆍ저온공학회논문지 (Progress in Superconductivity and Cryogenics)

  • 제21권1호
  • /
  • Pages.1-5
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  • 2019
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  • 1229-3008(pISSN)
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  • 2287-6251(eISSN)
한국초전도저온학회 (The Korean Society of Superconductivity and Cryogenics)
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Pulsed field magnetization of multi-turn short-circuited stabilized double pancake HTS coil

  • Korotkov, V.S. (National Research Center "Kurchatov Institute") ;
  • Krasnoperov, E.P. (National Research Center "Kurchatov Institute") ;
  • Brazhnik, P.A. (National Research Center "Kurchatov Institute") ;
  • Kartamyshev, A.A. (National Research Center "Kurchatov Institute") ;
  • Bishaev, A.M. (Russian Technological University(MIREA)) ;
  • Kozinsteva, M.V. (Russian Technological University(MIREA))
  • 투고 : 2019.02.18
  • 심사 : 2019.03.26
  • 발행 : 2019.03.31
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초록

The pulsed field magnetization of the short-circuited soldered double pancake coil made of stabilized commercial high-Tc superconductor (HTS) tape is experimentally studied. The evolution of the shielding current induced by the pulsed field and the trapped field after the pulsed magnetization was measured at 77 K. It is shown that the trapped field in the coil is close to the value reached in the field cooling process and reduces weakly at 5-fold increasing of pulsed field amplitude. The current relaxation at t~2 ms after the pulse is defined by the current sharing between the tape's copper coating and the $YBa_2Cu_3O_{7-d}$ layer. In the intermediate time scale (1 s < t < 100 s) the flux creep in HTS layer dominates. At t > 100 s the current's relaxation is defined by the resistance of soldered joint between tapes.

키워드

CJJOCB_2019_v21n1_1_f0001.png 이미지

Fig. 1. The experimental scheme (left) and the equivalent electric circuit of the coil (right).

CJJOCB_2019_v21n1_1_f0002.png 이미지

Fig. 2. Measured shielding currents in a multi-turn coil (the left axis) at magnetization by amplitudes μ0Ha. From top to down: 0.025 T; 0.095 T; 0.138 T and 0.6 T. A dotted line is an external magnetic field oscillogram with μ0Ha = 0.138 T (the right axis).

CJJOCB_2019_v21n1_1_f0003.png 이미지

Fig. 3. The field relaxation in the multi-turn short-circuited coil after the pulsed field magnetization. External pulse amplitude is μ0Ha = 0.138 T.

CJJOCB_2019_v21n1_1_f0004.png 이미지

Fig. 4. The relaxation of the trapped field at different amplitudes of the magnetizing pulses. From left to right μ0Ha = 0.095; 0.138; 0.23; 0.43 and 0.6 T.

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