NDLI: Evaluation of Stability of NbTi Multi-Strand Conductor by Induced-Current Methods

Content Provider	IEEE Xplore Digital Library
Author	Seo, K. Nishimura, A. Nishijima, G.
Copyright Year	2002
Abstract	NbTi cable-in-conduit-conductors (CICC's) are employed to fabricate plasma fusion experimental apparatuses. NbTi is a preferable material in terms of low cost and good manufacturability. In contrast, it shows lower stability compared to materials for high magnetic field applications, e. g. Nb₃Sn, due to its small critical temperature. A characteristic feature in NbTi multi-strand cable is so called avalanche-like quench, which is specific instability in a parallel electric circuit consisting of superconducting lines. To evaluate stability of a NbTi cable, we employed induced-current methods. Current is increased and decreased by constant voltage source, i. e. magnetic flux change produced by the bias magnet. We evaluated the quenches and equilibrium condition between heat generation due to flux flow voltage and heat transfer to surroundings at critical current. A parameter of experiment was a ramp rate of the bias field that corresponds to electric field in the cable. Of course, the cable was stable with smaller electric field and/or critical current. To survey the influence of heat dissipation during this equilibrium, we changed the surrounding mediums; those are liquid helium, frozen ethanol and ice. Ice is the material with large thermal conductivity, therefore this results in good stability of the cable.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1118
Ending Page	1122
Page Count	5
File Size	550814
File Format	PDF
ISSN	10518223
Volume Number	18
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Niobium compounds Titanium compounds Conductors Conducting materials Magnetic materials Superconducting cables Plasma temperature Circuit stability Superconducting magnets Voltage superconducting multi-strand cable CICC electric field non-uniform current distributions stability
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Quench Characteristics of an NbTi CICC With Non-Uniform Current Distribution

Ramp Rate Limitation of NbTi Cable-in-Conduit Conductor With Artificially Introduced Non-Uniform Current Distribution

Interstrand Resistance and Current Redistribution in a Cable-In-Conduit Conductor (CICC) Termination

Development and Test of a Miniature Novel Cable-In-Conduit-Conductor for Use in Fast Ramping Accelerators With Superconducting Magnets

DC Performance Results Versus Assessment of ITER Main Busbar NbTi Conductors

Advanced conductor configurations for large magnets

Application of the ENEA Joint Concept to NbTi CIC Conductors

Numerical analysis of stability margin and quench behavior of cable-in-conduit NbTi conductors for KSTAR

Reconstruction of current unbalance in full-size ITER NbTi CICC by self-field measurements

Evaluation of Stability of NbTi Multi-Strand Conductor by Induced-Current Methods

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Quench Characteristics of an NbTi CICC With Non-Uniform Current Distribution

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