NDLI: JT-60SA NbTi Wire Characterization After Thermal Shock Due to Helium Inlet Welding

Content Provider	IEEE Xplore Digital Library
Author	De Marzi, G. Fiamozzi Zignani, C. Polli, G.M. Cucchiaro, A. Drago, G. Cuneo, S. Terzi, F.
Copyright Year	2002
Abstract	As a part of the He inlet process's qualification and validation for the JT-60SA Toroidal Field Coil Magnets, TIG welding of the nozzle to the conductor jacket is a delicate process: in fact, NbTi/Cu wires may be exposed to high temperatures, thus resulting in a degradation of their critical currents. During the He inlet TIG welding process, temperatures have been accurately recorded by using several thermocouples placed in contact with the superconducting cable. After welding, several samples have been extracted from the thermally affected zone (TAZ), as well as far from TAZ (virgin state samples). Moreover, other samples have been heat treated according to the acceptable welding limit conditions allowed in the technical specification (i.e., 500°C for 30 s). Their critical current densities have been evaluated through detailed magnetic characterization measurements (isothermal hysteresis loops) as a function of an applied field (up to 7 T) and at two different temperatures (4.4 and 6.2 K). We found that none of the extracted wires are affected by welding. This findings implies that the margins defined in the technical specifications of the Nb-Ti/Cu conductors' welding process should be taken in due consideration to take all necessary precautions to stay well below that limit. However, it is worth noting that in the welding process only a limited number of wires in the cable may be affected thus assuring an adequate safety margin.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1
Ending Page	4
Page Count	4
File Size	820080
File Format	PDF
ISSN	10518223
Volume Number	24
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Welding Wires Temperature measurement Heating Superconducting cables Cable shielding Coils welding Critical current densities JT-60SA magnetic characterization superconducting NbTi wires
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Construction of the Jacketing Facility and First Production Results of Superconductor for JT-60SA

Study of NbTi Superconducting Strands for JT-60SA Toroidal Field Coils

Manufacturing and Fatigue Tests of PF1 Coil Helium Inlet

Completion of TF Strand Production and Progress of TF Conductor Manufacture for JT-60SA Project

Extended Quality Control Process Applied on TF Strand and TF Conductor Production for JT-60SA Project

Critical current degradation of a NbTi-multifilament conductor due to heat treatment

AC Loss and Temperature Margin of Cable-in-Conduit Conductors for JT-60SA Poloidal Field Coil

Protection for low current superconducting coils wound with insulated strand cable

Self Magnetic Field Measurements on Cable-In-Conduit Conductors for JT-60SA EF-H and EF-L coils

JT-60SA NbTi Wire Characterization After Thermal Shock Due to Helium Inlet Welding

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Completion of TF Strand Production and Progress of TF Conductor Manufacture for JT-60SA Project

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JT-60SA NbTi Wire Characterization After Thermal Shock Due to Helium Inlet Welding