Current redistribution of a current carrying superconducting tape in a perpendicular magnetic field

Yoo, Jinho; Lee, J.; Lee, S.-M.; Jung, Yeon Sang; Youm, Dojun; Oh, Su Jin

doi:10.1088/0953-2048/22/12/125019

Cited by 7 publications

(8 citation statements)

References 26 publications

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“…This result agreed with the analytical solution in [4]. Especially, for the gap = ∆y 1 (narrower gap case), the ac loss is almost one order of magnitude lower than those of the thin rectangle cross section case predicted in the theory [11]. From now on, we call the ∆y 1 and ∆y 2 for the case of the gap = ∆y 1 and ∆y 2 of antiparallel current path, respectively.…”

Section: Resultssupporting

confidence: 87%

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AC transport current loss analysis for anti-parallel current flow in face-to-face stacks of superconducting tapes

Yoo¹,

Han²,

Kim³

et al. 2014

Progress in Superconductivity and Cryogenics

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In this study we investigated ac transport current losses in the face to face stack for the anti-parallel current flow, and compared the electromagnetic properties with those of the single SC tape as well as those of the same stack for the parallel current path. The gap between the SC tapes in the stack varied in order to verify the electromagnetic influence of the neighbors when current flows in opposite direction, and the model was implemented in the finite element method program by the commercial software, COMSOL Multiphysics 4.2a. Conclusively speaking, the loss was remarkably decreased for the anti-parallel current case, which is attributed the magnetic flux compensation between the SC layers due to the opposite direction of the current flows. As the gap between SC tapes was increased, the loss mitigation became less effective. Besides, the current density distribution is very flat cross the sample width for the narrower gap case, which is believed to be benefit for the power electric system. These results are all in good agreement with those predicted theoretically for an infinite bifilar stack.

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Section: Resultssupporting

confidence: 87%

“…However, the penetration depth change as seen in Fig. 5 and 6, in other words, the Meissener region length ( M l ) (0 < x) with respect to I 0 is very distinguishable from that of the single SC layer predicted in [11]. It seemed too short, compared with that of the single SC case [10].…”

Section: Resultsmentioning

confidence: 83%

AC transport current loss analysis for anti-parallel current flow in face-to-face stacks of superconducting tapes

Yoo¹,

Han²,

Kim³

et al. 2014

Progress in Superconductivity and Cryogenics

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“…If g = −1, the critical currents in outer regions flow in the opposite direction ("fieldlike" state, see the bottom in Figure 9). The sheet current distributions calculated by the Kim model agree with the experiments 31 better than that by the Bean model. Obviously, one can recover the solutions for the case of "increasing-current only" and "increasing-field only" by letting a 1 = a 2 .…”

Section: Current Carrying Strip In a Perpendicular Fieldsupporting

confidence: 54%

Field-dependent critical state of high-Tc superconducting strip simultaneously exposed to transport current and perpendicular magnetic field

Xue

Yong

et al. 2013

AIP Advances

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We present an exact analytical approach for arbitrary field-dependent critical state of high-Tc superconducting strip with transport current. The sheet current and flux-density profiles are derived by solving the integral equations, which agree with experiments quite well. For small transport current, the approximate explicit expressions of sheet current, flux-density and penetration depth for the Kim model are derived based on the mean value theorem for integration. We also extend the results to the field-dependent critical state of superconducting strip in the simultaneous presence of applied field and transport current. The sheet current distributions calculated by the Kim model agree with experiments better than that by the Bean model. Moreover, the lines in the Ia-Ba plane for the Kim model are not monotonic, which is quite different from that the Bean model. The results reveal that the maximum transport current in thin superconducting strip will decrease with increasing applied field which vanishes for the Bean model. The results of this paper are useful to calculate ac susceptibility and ac loss.

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“…[1] In our previous studies, we measured distributions of DC transport current in coated conductor with various external magnetic fields [2] and noticed that the DC current distribution was redistributed by external fields [3][4][5][6][7]. Likewise the DC current experiment, investigation about distribution of AC transport current and field dependence of AC current had been necessary.…”

Section: Introductionmentioning

confidence: 99%

Selective detection of AC transport current distributions in GdBCO coated conductors using low temperature scanning Hall probe microscopy

Kim¹,

Kim²,

Park³

et al. 2017

Progress in Superconductivity and Cryogenics

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We studied the distribution of the current density and its magnetic-field dependence in GdBCO coated conductors with AC bias currents using low temperature scanning Hall probe microscopy. We selectively measured magnetic field profiles from AC signal obtained by Lock-in technique and calculated current distributions by inversion calculation. In order to confirm the AC measurement results, we applied DC current corresponding to RMS value of AC current and compared distribution of AC and DC transport current. We carried out the same measurements at various external DC magnetic fields, and investigated field dependence of AC current distribution. We notice that the AC current distribution unaffected by external magnetic fields and preserved their own path on the contrary to DC current.

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Current redistribution of a current carrying superconducting tape in a perpendicular magnetic field

Cited by 7 publications

References 26 publications

AC transport current loss analysis for anti-parallel current flow in face-to-face stacks of superconducting tapes

AC transport current loss analysis for anti-parallel current flow in face-to-face stacks of superconducting tapes

Field-dependent critical state of high-Tc superconducting strip simultaneously exposed to transport current and perpendicular magnetic field

Selective detection of AC transport current distributions in GdBCO coated conductors using low temperature scanning Hall probe microscopy

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