Homogeneous current distribution experiment in a multi-laminated HTS tape conductor for a double-pancake coil of SMES

Atomura, N.; Takahashi, Tomoko; Chiba, Yuya; Tsuda, Makoto; Hamajima, T.; Sueoka, Koji; Hirano, Naoki; Nagàya, Shigeo

doi:10.1016/j.physc.2011.05.202

Cited by 6 publications

(4 citation statements)

References 4 publications

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“…In recent years, there has been a strong interest in using REBa 2 Cu 3 O 7-x (REBCO, RE-rare earth element) coated conductors at low temperatures of 4.2-20 K and high magnetic fields for applications such as accelerator magnets for highenergy physics, fusion magnets, and superconducting magnetic energy storage systems (SMES) [1][2][3][4][5][6][7][8][9]. REBCO coated conductors made by metal organic chemical vapor deposition (MOCVD) and pulsed laser deposition (PLD) with incorporated artificial pinning centers (APCs) exhibit the critical current density (J c ) over 8 MA cm −2 and pinning force density (Fp) over 1.4 TN m −3 at 4.2 K and 20 T [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

In-field critical current and pinning mechanisms at 4.2 K of Zr-added REBCO coated conductors

Galstyan

Pratap

Majkic

et al. 2020

Supercond. Sci. Technol.

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The critical current and pinning mechanisms at 4.2 K have been studied over a magnetic field range of 0-14 T for Zr-added (0, 5 and 15 mol.%) REBa 2 Cu 3 O 7-x (REBCO and RE = rare earth) coated conductors fabricated by advanced metal organic chemical vapor deposition (A-MOCVD). It is found that the (Ba + Zr)/Cu content in Zr-added (5 and 15 mol.%) REBCO affects the critical current at 77 K, 0 T as well as density, continuity and shape of BaZrO 3 (BZO) self-assembled nanocolumns and RE 2 O 3 in-plane precipitates that significantly enhance the pinning force density Fp(H) as well as isotropic pinning landscape at 4.2 K. In addition to bell-shape dependence of critical current density, J c , at 4.2 K with (Ba + Zr)/Cu content we observed an unusual Fp(H) behavior correlated to particular type of pinning centers, morphology and distribution that have been revealed by TEM microstructure analysis. By fitting the Dew-Hughes equation of the pinning force density Fp(H) at 4.2 K we extract the scaling behaviors of the Fp(H) associated with the competition of pinning mechanisms driven by vertically-aligned BZO nanorods and in-plane RE 2 O 3 pinning defects. This result sheds light on approaches towards interactive control of strong and isotropic pinning centers in Zr-added REBa 2 Cu 3 O 7-x (REBCO and RE = rare earth) coated conductors, and especially understanding the correlation between microstructural characteristics and vortex pinning mechanisms at 4.2 K in high magnetic fields.

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Section: Introductionmentioning

confidence: 99%

In-field critical current and pinning mechanisms at 4.2 K of Zr-added REBCO coated conductors

Galstyan

Pratap

Majkic

et al. 2020

Supercond. Sci. Technol.

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“…Nonuniform current distribution is caused by the imbalance of inductance between turns. Uniform current distribution can be achieved by balancing the inductance between turns; such balance can be obtained through transposition of turns in a winding [9], [11] or regulation of distance between turns [10].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Current Profile and AC Loss of HTS Winding Wound by Parallel-Connected Tapes

et al. 2014

IEEE Trans. Appl. Supercond.

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Field penetration and ac loss of high-temperature superconductor (HTS) windings wound by parallel-connected (PC) tapes are simulated and calculated. The simulation is given to a winding with six tapes, which are connected to produce either n = 1, 2, 3, or 6 PC current turns. The PC turns are basically organized as two main types according to whether the turn end is soldered or not. The soldering state is controlled by shunt resistances between HTS tapes. Therefore, six independent PC structures are used for simulation. In addition to the HTS tapes, normal conductors, representing the possible reinforcement layers or stabilizer layers, are also built in the finite-element analysis (FEA) model. The simulation is carried out using the FEA software ANSYS, which is combined with the self-developed resistivity-adaption algorithm, a code that can cope with arbitrary FEA software to simulate field penetration into HTS. More importantly, we used the circuit-field analysis, so that we can adjust n values and the shunt resistance independently while we are simulating the field penetration process. AC loss contributed from different parts of the winding is separately studied as Q HTS , which is hysteresis loss generated in HTS; Q nor , which is eddy current loss generated in normal conductors; and Q cc , which is coupling loss generated in shunt resistances. The current profiles and Q HTS in each tape of the winding are very sensitive to the specific n value. However, the total Q HTS for different PC structures does not significantly change. Even under overestimation, Q nor can only be comparable with Q HTS when the frequency exceeds 1000 Hz. Q cc is prominent at low transport currents but is naturally restrained at high transport currents.Index Terms-AC loss, field profile, parallel connected (PC), resistivity-adaption algorithm (RAA), simulation.

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“…Many research prototypes for power cables [9][10][11], motors [12], fault current limiters [13], SMES (Superconducting Magnetic Energy Storage) [14] and transformers [15] using CC were demonstrated, and the projects for the application of superconducting AC power cables in a real power grid are now in progress in several countries [16,17].…”

Section: Introductionmentioning

confidence: 99%

Progress in research and development for REBCO coated conductors by reactive co-evaporation

Oh¹,

Kim²,

Ha³

et al. 2013

Progress in Superconductivity and Cryogenics

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This paper reviews recent progress in research and development (R&D) of reactive co-evaporation for high performance REBCO coated conductors in Korea. Two types of reactive co-evaporation methods were developed for the deposition of SmBCO and GdBCO superconducting layers respectively on the IBAD (Ion Beam Assisted Deposition)-MgO template in the Korean coated conductor project. Batch type reactive co-evaporation equipment and its processing were developed for SmBCO coated conductors at Korea Electrotechnology Research Institute (KERI) in conjunction with the Korea Advanced Institute of Science and Technology (KAIST), and a very high critical current exceeding 1,000 A/cm at 77 K in the self field was achieved through the optimization of deposition parameters. Reel-to-reel type reactive co-evaporation processing with a high conversion rate was also developed, while long length GdBCO coated conductors have been routinely produced by SuNAM Co. The minimum critical current of 422 A/cm-w at 77 K in self field was confirmed for 1 km-long GdBCO tape.

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Homogeneous current distribution experiment in a multi-laminated HTS tape conductor for a double-pancake coil of SMES

Cited by 6 publications

References 4 publications

In-field critical current and pinning mechanisms at 4.2 K of Zr-added REBCO coated conductors

In-field critical current and pinning mechanisms at 4.2 K of Zr-added REBCO coated conductors

Simulation of Current Profile and AC Loss of HTS Winding Wound by Parallel-Connected Tapes

Progress in research and development for REBCO coated conductors by reactive co-evaporation

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