The effect of magnetic properties of a composite superconductor on the losses in variable magnetic field: Part 1 theory

Zenkevitch, V.B.; Romanyuk, A.S.

doi:10.1016/0011-2275(79)90190-5

Cited by 21 publications

(3 citation statements)

References 7 publications

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“…Let us consider a composite with filaments of elliptical cross-section, arranged in an elliptical hexagonal lattice of the same demagnetizing factor as that of the filaments, D, Following the procedures given in [7] and [lo] for round filaments, we obtain the permeability in the form: (3 ) It is readily seen that for round filament with Df = 112, ( 3 ) gives the same result as (1).…”

Section: A Effective Permeabilitymentioning

confidence: 79%

Time constant measurements and effective permeability of a stack of high-T/sub c/ tapes

Eckelmann

Krempaský²,

Schmidt³

2001

IEEE Trans. Appl. Supercond.

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Filament cross-sections of High-Tc tapes have generally a large aspect ratio. The magnetic moment of the filaments which determines the magnetic properties of a stack of tapes therefore depends strongly on the magnetic field orientation. The stack can be treated as a material with an effective permeability Pes. For large field amplitudes Pef approaches unity, while for low amplitudes it can be considerably smaller than unity, namely in the case of perpendicular external field. We derived expressions for y,f for parallel and perpendicular field amplitudes well below the filament penetration field. Under this assumption the filaments are supposed to be perfectly diamagnetic. The theoretical predictions for pef are compared with the values extracted from direct time constant measurements.The experiments were performed with samples stacks of twisted and untwisted Bi-2223 tapes. The effective transverse matrix resistivity was found to be highly anisotropic which is understood as the presence of a boundary layer resistance between filaments and silver matrix.

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Section: A Effective Permeabilitymentioning

confidence: 79%

Time constant measurements and effective permeability of a stack of high-T/sub c/ tapes

Eckelmann

Krempaský²,

Schmidt³

2001

IEEE Trans. Appl. Supercond.

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“…Neither the linear, nor the quadratic fit properly describe the AC loss constructed by superposition of the coupling losses arising from multiple time constants in multi-stage cable [8] [9], presumably because of the shielding effectsthe early screening of the longest time constant and/or the shielding effect on the hysteretic loss at higher frequencies as described by eq. ( 7) of [10] and discussed in great detail in the last section of [11].…”

Section: Ac Loss Assessmentmentioning

confidence: 99%

Measurements of AC Loss Evolution in ITER TF Conductors

Sedlák¹,

Bruzzone²,

Mitchell

et al. 2022

IEEE Trans. Appl. Supercond.

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AC loss in the Nb3Sn cable-in-conduit conductors (CICC) usually decreases after the conductor undergoes electromagnetic cycling. This can be attributed to the increase of interstrand resistance due to the detachment of the strand-bonding during cyclic loading. In the years 2018 to 2020, ITER launched a series of test campaigns in SULTAN test facility, whose aim was to study the Tcs degradation of TF conductors of all manufactures. Along the main scope of the project, an accompanying study of the AC loss evolution has been measured on two samples. The AC loss was measured prior to any electromagnetic loading, after 1, 5, 50 and 1000 cycles, and at the very end also after a thermal cycle to room temperature. Sinusoidal AC loss was measured in the frequency range of 0.1 to 1.0 Hz. The measured AC evolution will help to predict heat load generated in the TF coils during the initial phase of ITER operation. It may also serve as an input to analysts for deducing the evolution of inter-strand resistance during electromagnetic cycling. The main observation is that already after the first electromagnetic cycle the AC loss reduction is significant, namely 80-90% lower compared to the initial conductor state.

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“…In the late 1970's, Zenkevitch [113] studied the dependence of hysteresis loss and frequency on applied magnetic field. For an external field amplitude larger than the penetration field ( > ), as in this case, the ratio / is defined as:…”

Section: Wp2 Hysteresis Loss Analysis Of Edipo Measurementsmentioning

confidence: 99%

Modeling electro-magnetic and thermal Stability of Cable-in-Conduit Superconductors for Fusion Magnets

Bagni

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The views and the opinions expressed herein do not necessarily reflect those of the ITER Organization as well as EUROFusion. vi vii per mio padre to my father viii xix 5.4. JackPot Plasma Scenario short sample simulation _____________ 5.4.1. Magneto-resistance and Lorentz' force effect ___________________ 5.4.2. Simulation results ________________________________________ 5.5. Temperature evolution in a layer of CSU2 module ____________ 5.5.1. JaskPot-THEA results ______________________________________ 5.6. Conclusion ____________________________________________

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The effect of magnetic properties of a composite superconductor on the losses in variable magnetic field: Part 1 theory

Cited by 21 publications

References 7 publications

Time constant measurements and effective permeability of a stack of high-T/sub c/ tapes

Time constant measurements and effective permeability of a stack of high-T/sub c/ tapes

Measurements of AC Loss Evolution in ITER TF Conductors

Modeling electro-magnetic and thermal Stability of Cable-in-Conduit Superconductors for Fusion Magnets

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