Induced Currents in Close-Ended Type-II Superconducting Coils

Chen, Xin; Wang, Renbo; Zhu, Jun; Li, Jing; Ma, Guangtong

doi:10.1109/tasc.2013.2273534

Cited by 7 publications

(2 citation statements)

References 3 publications

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“…The coil was zero-field cooled and magnetized [20]. The coil was fixed with its plane normal to the direction of external field generated by the magnet.…”

Section: Magnetizing the Coil And Free Current Decaymentioning

confidence: 99%

Angular dependence of direct current decay in a closed YBCO double-pancake coil under external AC magnetic field and reduction by magnetic shielding

Geng¹,

Zhang²,

Li³

et al. 2017

Supercond. Sci. Technol.

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High Tc superconducting (HTS) coils are ideal candidates in the use of high field magnets. HTS coils carrying a direct current, however, suffer a non-negligible loss when they are exposed to an external AC magnetic field. Although this phenomenon is well known, no study concerning AC magnetic field angular dependence of direct current decay has ever been shown. In this work, we experimentally investigate the direct current decay characteristics in a closed double pancake coil made of a YBCO coated conductor under external AC field. AC field of different angles with respect to the coil plane is applied. Results show that the current decay rate presents a strong angular dependence. The fastest decay occurs when the field is parallel to the coil plane, in which case the surface of the tape in the outermost layer experiences most flux variation. To reduce the decay rate, we propose wrapping superconducting tapes around the outermost layer of the coil to shield external AC field. This method significantly reduces direct current decay rate under parallel field, without affecting the perpendicular self-field of the coil.

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“…The coil was zero-field cooled and magnetized [20]. The coil was fixed with its plane normal to the direction of external field generated by the magnet.…”

Section: Magnetizing the Coil And Free Current Decaymentioning

confidence: 99%

Angular dependence of direct current decay in a closed YBCO double-pancake coil under external AC magnetic field and reduction by magnetic shielding

Geng¹,

Zhang²,

Li³

et al. 2017

Supercond. Sci. Technol.

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show abstract

“…6,7) Several jointing methods have been proposed for cuprate HTSs. However, all these methods have significant challenges that need to be addressed: (1) solder materials such as lead and bismuth show superconductivity approximately at the liquid helium temperature; therefore, the soldering joint at the liquid nitrogen temperature functions only as a low-resistance joint, [8][9][10] which certainly differs from a superconducting joint connecting the quantum phase of both sides. (2) Joints using deposition of superconductor and insulator layers enable multi-turn coil; 11,12) however, high vacuum equipment is required for their preparation and the sample size is limited to the size of the vacuum apparatus.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a high-T _c superconducting magnetic flux transformer with a 100 mm bore coil and static magnetic field transfer at 77 K.

Komori¹,

Arisawa²,

Ooi³

et al. 2021

Jpn. J. Appl. Phys.

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Herein, superconducting magnetic flux transformers with pickup coils of diameter 100 mm were prepared using a commercial RE123 high critical temperature (high-T c ) superconductive tape. A superconducting flux transformer requires a closed circuit containing a superconductive joint, which is difficult to prepare for a cuprate high-T c superconductor. Using the cut-and-wind method, seamless and large-bore coils were equipped to the flux transformer; these features are advantageous for non-destructive estimation and geological magnetic survey. The magnetic flux transfer of the applied static field caused by the spontaneously induced superconductive shield current at the liquid nitrogen temperature was confirmed, and the efficiency in the static field transfer, depending on the inductance of the coils in the flux transformer, was estimated.

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A linear induction motor with a coated conductor superconducting secondary

Chen

Zheng

et al. 2018

Physica C: Superconductivity and its Applications

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Induced Currents in Close-Ended Type-II Superconducting Coils

Cited by 7 publications

References 3 publications

Angular dependence of direct current decay in a closed YBCO double-pancake coil under external AC magnetic field and reduction by magnetic shielding

Angular dependence of direct current decay in a closed YBCO double-pancake coil under external AC magnetic field and reduction by magnetic shielding

Preparation of a high-T _c superconducting magnetic flux transformer with a 100 mm bore coil and static magnetic field transfer at 77 K.

A linear induction motor with a coated conductor superconducting secondary

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Induced Currents in Close-Ended Type-II Superconducting Coils

Cited by 7 publications

References 3 publications

Angular dependence of direct current decay in a closed YBCO double-pancake coil under external AC magnetic field and reduction by magnetic shielding

Angular dependence of direct current decay in a closed YBCO double-pancake coil under external AC magnetic field and reduction by magnetic shielding

Preparation of a high-T c superconducting magnetic flux transformer with a 100 mm bore coil and static magnetic field transfer at 77 K.

A linear induction motor with a coated conductor superconducting secondary

Contact Info

Product

Resources

About

Preparation of a high-T _c superconducting magnetic flux transformer with a 100 mm bore coil and static magnetic field transfer at 77 K.