Ac loss properties of YBCO superconducting tapes fabricated by IBAD-PLD technique

Iwakuma, Masataka; Nigo, Masahiro; Inoue, Daisuke; Miyamoto, Naoya; Funaki, K.; Iijima, Y.; Saitoh, Takashi; Yamada, Yutaka; Izumi, Teruo; Shiohara, Yuh

doi:10.1088/1742-6596/43/1/039

Cited by 12 publications

(18 citation statements)

References 3 publications

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“…For both single tapes and Roebel cables in the coupled case, we found that the AC loss does not only depend on the perpendicular component of the applied field, opposite to the published works [10,12,28,29,30,31,32]. For low angles between the applied field and the tapes plane and moderate and large amplitudes, the extrapolated AC loss from purely perpendicular applied fields assuming independence of the parallel component of the applied field is around 3 times lower than the actual one, therefore being this difference not negligible.…”

Section: Discussioncontrasting

confidence: 99%

“…The loss factor relative to the perpendicular applied magnetic field, Q/B 2 per , is generally not independent on the angle (figure 4), in contrast to the conclusions of earlier work [10,12,28,29,30,31,32]. However, there actually is this angle independence for large and moderate angles (≥30 o ).…”

Section: Ac Loss For a Single Tapementioning

confidence: 59%

“…For double (or single) pancake coils (or stacks of tapes) the magnetisation AC loss of stacks of tapes was simulated only for perpendicular applied fields in [23,24,20,25,21,26].The only measurements on the angular dependence of the AC loss are in [27]. However, there exists extensive work on coated conductors [28,29] and stacks of them [30,31,32]. All these measurements for single tapes and stacks were for coated conductors at an early stage of development, with poor artificial pinning and anisotropies approximately elliptical.…”

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confidence: 99%

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Numerical simulations of the angular dependence of magnetization AC losses: coated conductors, Roebel cables and double pancake coils

Pardo

Grilli

2011

Supercond. Sci. Technol.

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The AC loss in ReBCO coated conductors is large in situations when the conductors are subjected to a considerable magnetic field, like in rotating machines, transformers and high-field magnets. Roebel cables can reduce the AC loss in these cases. However, computer simulations are needed to interpret the experiments, understand the loss mechanisms, reduce the AC loss by optimising the Roebel cable and design the cryogenic system. In this article, we simulate and discuss the AC loss due to an applied magnetic field making an arbitrary angle with the cable and taking into account a realistic anisotropic field dependence of the critical current density. We study the AC loss in the superconductor parts for the limits of very high coupling currents and completely uncoupled strands. The simulations for the uncoupled case also describe a double pancake coil with no transport current. For the simulations, we use two different numerical methods with complementary strengths. This serves as a mutual check of the correctness of the simulation results, which agree to each other. Opposite than expected, we found that the AC loss does not only depend on the perpendicular component of the applied magnetic field. We also found that the AC loss for applied fields with an orientation below 7 degrees with the strands surface is reduced more than one order of magnitude comparing to an untransposed cable. Therefore, we recommend to use Roebel cables for windings with important parallel components of the magnetic field, such as transformers and high-field magnets.

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Section: Discussioncontrasting

confidence: 99%

Section: Ac Loss For a Single Tapementioning

confidence: 59%

mentioning

confidence: 99%

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Numerical simulations of the angular dependence of magnetization AC losses: coated conductors, Roebel cables and double pancake coils

Pardo

Grilli

2011

Supercond. Sci. Technol.

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“…Figure 10 shows the current distribution of three layers of Cable C, C2 and C3. The perfectly-aligned two layers with the same winding direction have stronger field shielding effects on each other, while the layer with the opposite winding direction sees more penetration of magnetic field through the air gap of other layers, and thus generating higher magnetization loss [57,58].…”

Section: Distribution Of Magnetization Loss Among Layersmentioning

confidence: 99%

Study of the magnetization loss of CORC^® cables using a 3D T-A formulation

Wang

Zhang

Grilli

et al. 2019

Supercond. Sci. Technol.

140

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Conductor on round core (CORC) cable wound with high temperature superconductors (HTS) is an important cable concept for high current density applications. The design of CORC cable makes the understanding of its electromagnetic performance -for example its AC losses -challenging. This paper presents a thorough study for CORC cables by combining experimental and numerical methods. In particular, the paper focuses on understanding how the cable structure influences the magnetization losses and on how these can be reduced. A novelty of this paper lies in the use of a new T-A formulation, which, for the first time, is employed for 3D modelling of CORC cable with real geometry. The use of the new T-A formulation in finite element software enables the study of how the winding direction and multiple-layer structure affect the magnetization losses of CORC cables. Moreover, influence of striation in CORC cable is studied as an effective way to reduce its losses. The CORC cable with striated tapes shows a significant magnetization loss reduction at high magnetic fields, in comparison to its un-striated counterpart. At low magnetic fields, tape striation leads to a loss rise when the number of filaments is low, then the loss drops with the further increase of filaments, but this loss reduction is much weaker than that at high fields. The paper provides an efficient tool for investigating the electromagnetic behaviour of CORC cables, which can provide valuable guidance in designing CORC cables with minimized losses for high energy physics and energy conversion applications. c c par per b par per c J J J B

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“…where i is It /Ic0 and (1-It /Ic0) is the filling portion of the DC current and Bep is the effective penetration field [25]- [26]. In our previous work, we have derived an analytical equation for the calculation of the Bth value in coated conductors exposed to perpendicular magnetic fields.…”

Section: B Rdyn Values In the Stack Under Perpendicular Magnetic Fieldmentioning

confidence: 99%

Dynamic Resistance Measurement in a Four-Tape YBCO Stack With Various Applied Field Orientation

Liu

Jiang

et al. 2019

IEEE Trans. Appl. Supercond.

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The dynamic resistance which occurs when a superconductor carrying DC current is exposed to alternating magnetic field plays an important role in HTS applications such as flux pumps and rotating machines. We report experimental results on dynamic resistance in a four-tape coated conductor stack when exposed to AC magnetic fields with different magnetic field angles (the angles between the magnetic field and normal vector component of the tape surface, ) at 77 K. The conductors for the stack are 4 mm-wide SuperPower SC4050 wires. The field angle was varied from 0 ˚ to 120 ˚ at a resolution of 15 ˚ to study the field angle dependence of dynamic resistance on field angle as well as wire Ic (B, ). We also varied the field frequency, the magnetic field amplitude, and the DC current level to study the dependence of dynamic resistance on these parameters. Finally, we compared the measured dynamic resistance results at perpendicular magnetic field with the analytical models for single wires. Our results show that the dynamic resistance of the stack was mainly, but not solely, determined by the perpendicular magnetic component. Ic (B,) influences dynamic resistance in the stack due to tilting of the crystal lattice of the superconductor layer with regard to buffer layers.  Index Terms-Dynamic resistance, HTS stack, Angle dependence.

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Ac loss properties of YBCO superconducting tapes fabricated by IBAD-PLD technique

Cited by 12 publications

References 3 publications

Numerical simulations of the angular dependence of magnetization AC losses: coated conductors, Roebel cables and double pancake coils

Numerical simulations of the angular dependence of magnetization AC losses: coated conductors, Roebel cables and double pancake coils

Study of the magnetization loss of CORC^® cables using a 3D T-A formulation

Dynamic Resistance Measurement in a Four-Tape YBCO Stack With Various Applied Field Orientation

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Ac loss properties of YBCO superconducting tapes fabricated by IBAD-PLD technique

Cited by 12 publications

References 3 publications

Numerical simulations of the angular dependence of magnetization AC losses: coated conductors, Roebel cables and double pancake coils

Numerical simulations of the angular dependence of magnetization AC losses: coated conductors, Roebel cables and double pancake coils

Study of the magnetization loss of CORC® cables using a 3D T-A formulation

Dynamic Resistance Measurement in a Four-Tape YBCO Stack With Various Applied Field Orientation

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Study of the magnetization loss of CORC^® cables using a 3D T-A formulation