Two-dimensional quench simulation of composite CuNb/Nb sub(3)Sn conductors

In order to clarify effect of utilizing a Nb rich CuNb reinforment on superconducting stability, r-z two-dimensional time-dependent numerical simulations on composite CuNb/Nb sub(3)Sn wires are conducted. The time variations of temperature and current density distributions, minimum quench energy (MQ...

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Bibliographic Details
Published in:Cryogenics (Guildford) 2000-01, Vol.40 (6), p.393-401
Main Authors: Murakami, Tomoyuki, Murase, Satoru, Shimamoto, Susumu, Awaji, Satoshi, Watanabe, Kazuo
Format: Article
Language:English
Subjects:
Composite materials
Computer simulation
Copper alloys
Current density
Niobium alloys
Quenching
Superconducting materials
Superconductivity
Tensile strength
Volume fraction
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Summary:In order to clarify effect of utilizing a Nb rich CuNb reinforment on superconducting stability, r-z two-dimensional time-dependent numerical simulations on composite CuNb/Nb sub(3)Sn wires are conducted. The time variations of temperature and current density distributions, minimum quench energy (MQE), and normal zone propagation velocity ( nu sub(p)) of a Cu-17vol%Nb/Nb sub(3)Sn wire, a Cu-63vol%Nb/Nb sub(3)Sn wire, and a conventional Cu/Nb sub(3)Sn wire are investigated. The increase of the volume fraction of an outermost Cu stabilizer provides high MQE but decreases the total current density. Although the nu sub(p) is not significantly influenced by the Nb fraction, the Nb rich CuNb reinforcement sacrifices the MQE for its high tensile strength. It is important for magnet design to control the volume fraction of the Cu stabilizer and Nb fraction in the CuNb reinforcement to balance the desired current density, tensile strength, and superconducting stability.
ISSN:0011-2275