Nondestructive Investigation of Position Dependent $I_{\rm c}$ Variations in Multi-Meter Coated Conductors

Coulter, J. Y.; Holesinger, T. G.; Kennison, J. A.; Willis, J. O.; Rupich, M.W.

doi:10.1109/tasc.2009.2019252

Cited by 19 publications

(14 citation statements)

References 12 publications

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“…Critical currents as well as n-values of all types of characterized tapes are listed in table 1 Surprisingly, n-values of the AMSC tape are not dependent on the angle of magnetic field, even though some correlation between n-values and critical current exists also in RABiTS AMSC tape as presented in [2]. Figures 2 and 5 are even showing signs of inverse J c -n-value correlation, which will be discussed later in this paper.…”

Section: Tapes In Low Magnetic Fieldsmentioning

confidence: 83%

“…Figures 2 and 5 are even showing signs of inverse J c -n-value correlation, which will be discussed later in this paper. In numerous experimental studies, it has been observed that n-values are usually correlated with critical currents [1,2,30], which causes that n-value varies also with external magnetic field. However, if the correlation is a consequence of relation presented by Zeldov et al [31], then:…”

Section: Tapes In Low Magnetic Fieldsmentioning

confidence: 99%

“…V/V c =(I/I c ) n (1) where V and I are the measured voltage and current, V c is the voltage criterion, I c is the critical current and the n-value the exponent n. Even though the n-value is an important superconducting parameter, results on 2 G HTS tapes are available only in a few recent publications [1][2][3][4][5]. Therefore, a comprehensive overview of experimental n-value data would be beneficial when dealing with numerical modelling of superconductors.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

n-Values of commercial YBCO tapes before and after irradiation by fast neutrons

Chudý

Zhong

Eisterer

et al. 2015

Supercond. Sci. Technol.

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The n-value is an important superconducting parameter, which represents the homogeneity of characterized superconductor as well as thermally activated depinning. In addition n-values are important for the evaluation of pinning mechanisms and pinning forces. n-values are crucial input parameters for the numerical simulations of superconducting tapes, coils and other complicated superconducting applications where E-J power law applies. In this publication, complex measurement data of n-values from different 2 nd generation of high temperature superconducting (2G HTS) tapes are presented and analysed. In addition, 2G HTS tapes were step by step irradiated by fast neutron fluences up to 1x10 22 m-2. n-values of the irradiated tapes, containing additional randomly distributed pinning centres, are presented, analysed and compared with unirradiated samples. Special attention is placed on the underlying physics resulting in power-law part of the I-V curve and on the correlation between critical currents and n-values. The measurements are performed within the temperature range of 50 K-85 K and magnetic fields up to 15 T. I Introduction Each I-V curve of a superconducting sample contains a power-law part close to the transition to the dissipative state. This part of the I-V curve can be described by a simple equation: V/V c =(I/I c) n (1)

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Section: Tapes In Low Magnetic Fieldsmentioning

confidence: 83%

Section: Tapes In Low Magnetic Fieldsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

n-Values of commercial YBCO tapes before and after irradiation by fast neutrons

Chudý

Zhong

Eisterer

et al. 2015

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…A core capability at Los Alamos is a single-pass method for characterizing in-field uniformity where I c (H||ab) and I c (H||c) are measured as a function of position, in increments as short as 0.5 cm, at 75 K and 0.5 T [10]. At the present, the apparatus can perform I c (H||c) measurements up to 1.4 T. In the apparatus, the H||ab plane field, 0.52T is generated by permanent magnets in a goniometer and therefore is not variable.…”

Section: Methodsmentioning

confidence: 99%

Systematic Behaviors of ab-plane Pinning Variations in a Practical Length Wire Fabricated by the MOD/RABiTS Process

et al. 2010

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In-field critical current I c variations, detected using a short sample, angular I c (77K, H=5.2kOe, Angle) measurement on the ends of a 20 m coated conductor tape fabricated by the MOD / RABiTS process, are shown to be variations in the I c (H) anisotropy that exist on subcentimeter length scales. A I c (75 K, H, Angle) study was performed on segments cut from the tape where the power law exponent of the field dependence, , I c ~Hwas calculated for I c (H, Angle) data. Two extrema behaviors, anisotropic and isotropic, were identified. The isotropic material is shown to outperform the anisotropic material for a wide range of fields and angles at T=26 K.

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“…We had performed a single pass bi-axial field characterization experiment previously on an MOD / RABiTS conductor (a chemical solution deposition process) [5] but we had never performed a characterization test of the single pass bi-axial field characterization method itself: Aside from working with some LANL PLD / IBAD conductor [6], we had limited experience characterizing the superconducting properties of conductors produced by the physical vapor deposition / IBAD method. This measurement was our first 'test of the test' of J c (x) variation identification using single pass, biaxial field, I c characterization.…”

Section: Measurements A) Biaxial Field I C S: Determining J C Uniformmentioning

confidence: 99%

IDENTIFYING AND INVESTIGATING J[sub c] VARIATIONS IN COATED CONDUCTORS FABRICATED BY MOCVD∕IBAD

Coulter¹,

Ugurlu²,

Willis³

et al. 2010

AIP Conference Proceedings

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A novel processing aid for polymer extrusion: Rheology and processing of polyethylene and hyperbranched polymer blends Journal of Rheology 43, 781 (1999); https://doi.org/10.1122/1.550999 35.4 T field generated using a layer-wound superconducting coil made of (RE)Ba 2 Cu 3 O 7−x (RE = rare earth) coated conductor ABSTRACTA single-pass position dependent critical current I c measurement is described that characterizes the pinning properties of long coated conductor tapes using magnetic fields applied bi-axially to the conductor. By this method, a 10 meter long MOCVD / IBAD conductor is shown to exhibit position-dependent variations in the I c (H||ab) /I c (H||c) ratio resulting from underlying variations in the microstructure. Regions with these variations were investigated nondestructively using angular anisotropy and c-axis magnetic field measurements at 75 K. Results from analytical microscopy confirmed the presence of variations in rare earth oxide precipitate concentrations as a function of position that are attributed to be the cause of the pinning variations.

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Nondestructive Investigation of Position Dependent $I_{\rm c}$ Variations in Multi-Meter Coated Conductors

Cited by 19 publications

References 12 publications

n-Values of commercial YBCO tapes before and after irradiation by fast neutrons

n-Values of commercial YBCO tapes before and after irradiation by fast neutrons

Systematic Behaviors of ab-plane Pinning Variations in a Practical Length Wire Fabricated by the MOD/RABiTS Process

IDENTIFYING AND INVESTIGATING J[sub c] VARIATIONS IN COATED CONDUCTORS FABRICATED BY MOCVD∕IBAD

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