Dynamic resistance measurement in a YBCO wire under perpendicular magnetic field at various operating temperatures

Liu, Yanchao; Jiang, Zhenan; Sidorov, Gennady; Bumby, Chris W.; Badcock, Rodney A.; Fang, Jin

doi:10.1063/1.5138191

Cited by 20 publications

(38 citation statements)

References 29 publications

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“…when i = 0, from view A, it clearly shows only shielding currents are induced at the edges, as highlighted in black circles where magnetization loss is generated. No current flows in the central region, which is consistent to previous papers [14], [15], [16], [17], [18]. When i = 0.5 and B a = 5 mT, there is no dynamic resistance as shown in Fig.…”

Section: Figure 10 Dynamic Resistance Comparison Between the Inner La...supporting

confidence: 91%

“…To date, many previous works on dynamic resistance and total loss have mainly focused on single HTS coated conductor tapes [12], [13], [14], [15], [16], [17] or stacks [3], [18], [19], [20], [21], [22], [23]. In terms of the operating conditions, the dependence of dynamic resistance and total loss of single REBCO coated conductors on magnetic field/DC current/temperature/frequency have been investigated through experiments [13], [14], [15]. Dynamic resistance and total loss of a three-tape HTS stack have been measured where both magnetization loss and dynamic loss in the stack were smaller than a single tape due to the shielding effect [18].…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Dynamic Resistance and Total Loss of HTS CORC Cables

et al. 2023

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In some high temperature superconducting (HTS) applications, HTS coated conductors carry DC current under external AC magnetic fields. Dynamic resistance occurs when the amplitude of the magnetic field is greater than the threshold magnetic field of the coated conductors. The resulting AC loss, termed as total loss, consists of dynamic loss due to dynamic resistance and magnetization loss due to the shielding currents caused by the AC magnetic field. Conductor on round core (CORC) cables wound with HTS coated conductors have attracted broad attention due to their large current-carrying capability and mechanical flexibility for coil applications. However, there has been no report on dynamic resistance and total loss in CORC cables. In this work, we present 3D FEM simulation results on the dynamic resistance and total loss of a spiral tape and three CORC cables, based on the T −A formulation. The number of layers of the CORC cables, the amplitude of the AC magnetic field and transport DC current levels have been varied to study the impact of those parameters on dynamic resistance and total loss of the three CORC cables. The simulation results show that magnetization loss without current in a spiral tape can be analytically estimated by Brandt and Indenbom's theoretical equation for a superconducting strip under perpendicular AC magnetic field with a geometric coefficient 2/π. Furthermore, dynamic resistance of the spiral tape and each tape in a single-layer cable can be predicted by the analytical equation for a strip carrying DC current under perpendicular AC magnetic field, also taking into account the geometric coefficient 2/π. The simulation results also show that the difference of total loss values in the three CORC cables depends on the shielding effect: the more layers of CORC cables, the lower each loss component. The two-layer Cable with each tape in the outer layer sitting on top of the tape in the inner layer has the lowest loss and the highest threshold magnetic field.

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Section: Figure 10 Dynamic Resistance Comparison Between the Inner La...supporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Simulation of Dynamic Resistance and Total Loss of HTS CORC Cables

et al. 2023

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“…[7] YBa 2 Cu 3 O 7Àδ (YBCO) is one of the most interesting superconductors as its upper critical magnetic field and critical current density are quite large among HTSC; this compound is more exploited for intense magnetic field production, power cables transmission. [8] For these reasons, many recent works focus on YBCO's properties improvement [9] and properties investigation, such as critical temperature prediction, [10] temperature resistivity, transition region broadening, magnetic penetration depth, and coherence length. Recently, several groups had studied the scaling behavior for various samples of YBCO grown under different conditions.…”

mentioning

confidence: 99%

“…Recently, several groups had studied the scaling behavior for various samples of YBCO grown under different conditions. [8,[11][12][13][14][15][16][17] Slimani et al investigated the flux pinning properties of YBCO added by WO 3 nanoparticles. [18] Also, the impact of Dy 2 O 3 nanoparticles addition on the properties of porous YBCO ceramics is analyzed by Almessiere et al [19] In this investigation, on the one hand, the magnetization measurements have been performed on high-temperature superconductor's single-crystal YBa 2 Cu 3 O 7Àδ at large ranges of temperature T (15À85 K) and in magnetic fields up to 6 T. The temperature dependence of the magnetic penetration depth is estimated from the slope of the linear M(lnH) dependence in the London regime for three directions of the applied magnetic field with the c-axis (θ ¼ 0 , 30 , and 45 ), θ is the angle between the direction of the applied magnetic field and the crystallographic c-axis.…”

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confidence: 99%

Magnetic Penetration Depth and Coherence Length in a Single‐Crystal YBa₂Cu₃O_7−δ

Hassan

Labrag

Taoufik

et al. 2021

Physica Status Solidi (b)

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At a certain level in the history of superconductivity, it became indispensable to appropriate a microscopic theory that accounts for all the properties that manifest the superconducting materials. In the absence of such a description, we dispose another socalled Ginzburg-Landau (GL) phenomenological theory established in 1950, capable of describing all the properties listed up to now. The basics of this theory rest on the theory of second-order phase transitions founded in 1937 by Lev Landau. The advent of GL theory comes to fill the insufficiency in the London brothers' electrodynamic theory to explain the coexistence of a superconducting phase and a normal phase in a type II superconductor. In addition, it suggests for the first time that the superconducting state is more ordered than the normal state. This is an intuitive thermodynamic theory without a microscopic basis. For this reason, Western scientists did not give it importance. However, the Bardeen-Cooper-Schrieffer theory will come to justify it a posteriori due to the work of Gorkov in 1959 and another version of GL's theory appeared and was called the GLAG theory in honor of these founders Ginzburg, Landau, Abrikosov, and Gorkov. In this new version, the order parameter is directly associated with the Cooper pair wave function. The GL theory is presented in several variants in literature and the intuitive ideas on which they are based seem to be sometimes disconcerting. In contrast, this theory remains very rich because it accounts for the superconductor-normal transition, as well as the thermodynamic, electrodynamic, and quantum effects of the superconducting phase.The theories of V. L. Ginzburg and L. D. Landau highlight two characteristic lengths in the physics of superconductivity [1,2] : 1) The magnetic flux penetration length, known as the London length λ, which defines the length over which magnetic induction can vary in a superconducting material. 2) The coherence length ξ, which represents the spatial dimension of a superconducting pair, i.e., the minimum length over which superconductivity can vary until it disappears. Pairs have reduced dimensions in high-temperature superconductors, where ξ is comparable with the characteristic quantities of the crystal lattice.The quantities λ and ξ diverge for temperatures close to the critical temperature T c . This divergence relates to the weakening of the pairing interaction in the face of thermal agitation and leads to the transition from the superconducting state to the normal state. [3] On the contrary, they allow expressing the critical quantities that delimit the domain of existence of the superconducting state under the effect of an external magnetic field.The variety of behaviors of a superconducting material subjected to an external magnetic field B ¼ μH can be summarized

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“…The dynamic loss is calculated by measuring the voltage along with the transport current of the coated conductor sample. The measurement method has been extensively applied to much experimental exploration of dynamic loss and dynamic resistance of HTS CCs [16,63,64,[158][159][160][161]. Ogawa has studied the magnetization loss and dynamic loss of an HTS pancake coil with a double pick-up coil method and found that the dynamic resistance can mitigate the DC of the coil when it is operated in the permanent current mode [135].…”

Section: Electric Methodsmentioning

confidence: 99%

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

Zhang¹,

Wen²,

Grilli

et al. 2021

Energies

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Superconductor technology has recently attracted increasing attention in power-generation- and electrical-propulsion-related domains, as it provides a solution to the limited power density seen by the core component, electrical machines. Superconducting machines, characterized by both high power density and high efficiency, can effectively reduce the size and mass compared to conventional machine designs. This opens the way to large-scale purely electrical applications, e.g., all-electrical aircrafts. The alternating current (AC) loss of superconductors caused by time-varying transport currents or magnetic fields (or both) has impaired the efficiency and reliability of superconducting machines, bringing severe challenges to the cryogenic systems, too. Although much research has been conducted in terms of the qualitative and quantitative analysis of AC loss and its reduction methods, AC loss remains a crucial problem for the design of highly efficient superconducting machines, especially for those operating at high speeds for future aviation. Given that a critical review on the research advancement regarding the AC loss of superconductors has not been reported during the last dozen years, especially combined with electrical machines, this paper aims to clarify its research status and provide a useful reference for researchers working on superconducting machines. The adopted superconducting materials, analytical formulae, modelling methods, measurement approaches, as well as reduction techniques for AC loss of low-temperature superconductors (LTSs) and high-temperature superconductors (HTSs) in both low- and high-frequency fields have been systematically analyzed and summarized. Based on the authors’ previous research on the AC loss characteristics of HTS coated conductors (CCs), stacks, and coils at high frequencies, the challenges for the existing AC loss quantification methods have been elucidated, and multiple suggestions with respect to the AC loss reduction in superconducting machines have been put forward. This article systematically reviews the qualitative and quantitative analysis methods of AC loss as well as its reduction techniques in superconductors applied to electrical machines for the first time. It is believed to help deepen the understanding of AC loss and deliver a helpful guideline for the future development of superconducting machines and applied superconductivity.

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Dynamic resistance measurement in a YBCO wire under perpendicular magnetic field at various operating temperatures

Cited by 20 publications

References 29 publications

Simulation of Dynamic Resistance and Total Loss of HTS CORC Cables

Simulation of Dynamic Resistance and Total Loss of HTS CORC Cables

Magnetic Penetration Depth and Coherence Length in a Single‐Crystal YBa₂Cu₃O_7−δ

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

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Dynamic resistance measurement in a YBCO wire under perpendicular magnetic field at various operating temperatures

Cited by 20 publications

References 29 publications

Simulation of Dynamic Resistance and Total Loss of HTS CORC Cables

Simulation of Dynamic Resistance and Total Loss of HTS CORC Cables

Magnetic Penetration Depth and Coherence Length in a Single‐Crystal YBa2Cu3O7−δ

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

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Magnetic Penetration Depth and Coherence Length in a Single‐Crystal YBa₂Cu₃O_7−δ