Coupling Current and Hysteresis Losses of Bi2212 Round Wires with Twisted Filaments

AC loss measurements have been carried out on Bi2212 round wires of different twist pitches. With systematical variation of sample temperature (5 K – 70 K) and ac field amplitude (≤0.2 T) as well as frequency (20 Hz – 2 kHz), this work shows (a) the full coupling of the non-twisted wire, (b) the unc...

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Detalles Bibliográficos
Autores principales: Yang, I, Pelegrin, J, Young, EA, Falorio, I, Ballarino, A, Bottura, L, Miao, H, Huang, Y
Lenguaje:eng
Publicado: 2015
Materias:
Accelerators and Storage Rings
Acceso en línea:https://dx.doi.org/10.1109/TASC.2014.2373655
http://cds.cern.ch/record/1987560
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author Yang, I
Pelegrin, J
Young, EA
Falorio, I
Ballarino, A
Bottura, L
Miao, H
Huang, Y
author_facet Yang, I
Pelegrin, J
Young, EA
Falorio, I
Ballarino, A
Bottura, L
Miao, H
Huang, Y
author_sort Yang, I
collection CERN
description AC loss measurements have been carried out on Bi2212 round wires of different twist pitches. With systematical variation of sample temperature (5 K – 70 K) and ac field amplitude (≤0.2 T) as well as frequency (20 Hz – 2 kHz), this work shows (a) the full coupling of the non-twisted wire, (b) the uncoupling of sub-wires by twisting at moderate pitch up to 12 mm, (c) a relatively short time constant of milliseconds for the coupling current due to a high transverse resistivity, and (d) an effective (de)coupling diameter of 0.4mm about 1.6x of sub-wire bundles. The results suggest a promising potential for improving filament decoupling.
id cern-1987560
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2015
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spelling cern-19875602019-09-30T06:29:59Zdoi:10.1109/TASC.2014.2373655http://cds.cern.ch/record/1987560engYang, IPelegrin, JYoung, EAFalorio, IBallarino, ABottura, LMiao, HHuang, YCoupling Current and Hysteresis Losses of Bi2212 Round Wires with Twisted FilamentsAccelerators and Storage RingsAC loss measurements have been carried out on Bi2212 round wires of different twist pitches. With systematical variation of sample temperature (5 K – 70 K) and ac field amplitude (≤0.2 T) as well as frequency (20 Hz – 2 kHz), this work shows (a) the full coupling of the non-twisted wire, (b) the uncoupling of sub-wires by twisting at moderate pitch up to 12 mm, (c) a relatively short time constant of milliseconds for the coupling current due to a high transverse resistivity, and (d) an effective (de)coupling diameter of 0.4mm about 1.6x of sub-wire bundles. The results suggest a promising potential for improving filament decoupling.CERN-ACC-2015-0020oai:cds.cern.ch:19875602015-09-02
spellingShingle Accelerators and Storage Rings
Yang, I
Pelegrin, J
Young, EA
Falorio, I
Ballarino, A
Bottura, L
Miao, H
Huang, Y
Coupling Current and Hysteresis Losses of Bi2212 Round Wires with Twisted Filaments
title Coupling Current and Hysteresis Losses of Bi2212 Round Wires with Twisted Filaments
title_full Coupling Current and Hysteresis Losses of Bi2212 Round Wires with Twisted Filaments
title_fullStr Coupling Current and Hysteresis Losses of Bi2212 Round Wires with Twisted Filaments
title_full_unstemmed Coupling Current and Hysteresis Losses of Bi2212 Round Wires with Twisted Filaments
title_short Coupling Current and Hysteresis Losses of Bi2212 Round Wires with Twisted Filaments
title_sort coupling current and hysteresis losses of bi2212 round wires with twisted filaments
topic Accelerators and Storage Rings
url https://dx.doi.org/10.1109/TASC.2014.2373655
http://cds.cern.ch/record/1987560
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