NDLI: Investigation on Thermal Strain in Full Size ITER Conductors

Content Provider	IEEE Xplore Digital Library
Author	Decool, P. Bessette, D. Cantone, V. Cloez, H.
Copyright Year	2002
Abstract	The TF magnetic system of the international thermonuclear experimental reactor (ITER) will be composed of 18 superconducting coils assembled in a torus. The design of these large coils relies on the use of a circular cable-in-conduit conductor (CICC) composed of a cable of about one thousand twisted Nb₃Sn and copper strands embedded in a thin steel jacket. The different thermal contractions of the materials composing this conductor during the cool down from the Nb₃Sn heat treatment reaction temperature (about 920 K) to the operating temperature (about 5 K) result in a compressive strain on the superconducting Nb₃Sn filaments which leads to a degradation of the conductor critical current. The qualification of the ITER conductor prototypes will be performed by testing short straight full size samples in the unique European test facility SULTAN at PSI (Switzerland). A comparison of the performance of the toroidal field model coil (TFMC) conductor in a short straight sample and in the coil has shown indications that the sample performance is better, apparently because the thermal strain in Nb₃Sn is lower. It looks possible that this could have been caused by a slippage between the cable and the jacket in the joints at the sample ends during the heat treatment. In this case, these kind of short straight samples could not be relevant for conductor qualification. An investigation on the thermal strain by destructive examination of different TFMC conductor samples, including one leg of the TFMC short sample tested in 1999 in the SULTAN facility, was performed at CEA Cadarache. The paper reports on the different strain measurements, proposes an analytical approach of the results in order to conclude on the relevance of straight samples.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1097
Ending Page	1100
Page Count	4
File Size	316920
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	Thermal conductivity Capacitive sensors Conductors Niobium Tin Cable shielding Conducting materials Superconducting coils Superconducting cables Superconducting materials
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Thermo-Mechanics of the Hierarchical Structure of ITER Superconducting Cables

Manufacturing of the ITER TF Full Size Prototype Conductor

EU conductor development for ITER CS and TF Model Coils

Shape memory effect of cable-in-conduit conductors

Conductor fabrication for the ITER model coils

Manufacturing and Preliminary Performance Expectations of $hbox{Nb}_{3}hbox{Sn}$ Based Conductors Allocated for the First ITER TF Coil With CICC From Korea

Russia's Contribution to the ITER TF Magnets

Examination of Japanese Mass-Produced ${rm Nb}_{3}{rm Sn}$ Conductors for ITER Toroidal Field Coils

Transverse stress effects in ITER conductors

Investigation on Thermal Strain in Full Size ITER Conductors

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