Flux Creep in Multifilamentary Conductors of NbTi and Nb<Subscript>3</Subscript>Sn: Fid-Bau Portal

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Flux Creep in Multifilamentary Conductors of NbTi and Nb3Sn

Ghosh, A. K. / Xu, Youwen / Suenaga, M.

Abstract Long term decay of the sextupole field has been observed in accelerator dipole magnets, and this effect has been linked to “flux creep” in the superconductor. To study this problem, the decay of the magnetization of mult if ilamentary conductors of NbTi and Nb-Sn have been measured as a function of time. Measurements show that as a function of lnt this decay cannot always be characterized by a single decay rate. Long time decay rates are sometimes approximately half that which is observed at short times < 1000 secs. Creep rates are found to: (1) scale with filament diameter, (2) change slowly with field, (3) change rapidly as H is backed off from the critical state and (4) is fairly insensitive to temperature for 0.3TC < T < 0.8TC. Results of this investigation are compared to sextupole field decay observed in magnets.

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Flux Creep in Multifilamentary Conductors of NbTi and Nb3Sn

Ghosh, A. K. / Xu, Youwen / Suenaga, M.

Abstract Long term decay of the sextupole field has been observed in accelerator dipole magnets, and this effect has been linked to “flux creep” in the superconductor. To study this problem, the decay of the magnetization of mult if ilamentary conductors of NbTi and Nb-Sn have been measured as a function of time. Measurements show that as a function of lnt this decay cannot always be characterized by a single decay rate. Long time decay rates are sometimes approximately half that which is observed at short times < 1000 secs. Creep rates are found to: (1) scale with filament diameter, (2) change slowly with field, (3) change rapidly as H is backed off from the critical state and (4) is fairly insensitive to temperature for 0.3TC < T < 0.8TC. Results of this investigation are compared to sextupole field decay observed in magnets.

Flux Creep in Multifilamentary Conductors of NbTi and Nb3Sn

Ghosh, A. K. / Xu, Youwen / Suenaga, M.

Abstract Long term decay of the sextupole field has been observed in accelerator dipole magnets, and this effect has been linked to “flux creep” in the superconductor. To study this problem, the decay of the magnetization of mult if ilamentary conductors of NbTi and Nb-Sn have been measured as a function of time. Measurements show that as a function of lnt this decay cannot always be characterized by a single decay rate. Long time decay rates are sometimes approximately half that which is observed at short times < 1000 secs. Creep rates are found to: (1) scale with filament diameter, (2) change slowly with field, (3) change rapidly as H is backed off from the critical state and (4) is fairly insensitive to temperature for 0.3TC < T < 0.8TC. Results of this investigation are compared to sextupole field decay observed in magnets.

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Title:

Flux Creep in Multifilamentary Conductors of NbTi and Nb3Sn

Contributors:

Ghosh, A. K. (author) / Xu, Youwen (author) / Suenaga, M. (author)

Published in:

Advances in Cryogenic Engineering Materials ; 27-33

An International Cryogenic Materials Conference Publication ; 36

Publication date:

1990-01-01

Size:

7 pages

ISBN:

978-1-4613-9882-0 , 978-1-4613-9880-6

ISSN:

DOI:

https://doi.org/10.1007/978-1-4613-9880-6_4

Type of media:

Article/Chapter (Book)

Type of material:

Electronic Resource

Language:

English

Keywords:

Creep Rate , Critical State Model , Wire Sample , Filament Diameter , Flux Creep Chemistry , Biochemical Engineering , Characterization and Evaluation of Materials , Mechanical Engineering

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