Neutron diffraction measurement of internal strain in the first Japanese ITER CS conductor sample

Several conductor samples were fabricated and tested in the SULTAN facility at CRPP for ITER Central Solenoid (CS) conductor qualification. From the result of the cyclic testing on the first and second conductor samples named CSJA01 and CSJA02, continuous linear degradation of the current sharing te...

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Bibliographic Details
Published in:Superconductor science & technology 2013-08, Vol.26 (8), p.84002-6
Main Authors: Hemmi, T, Harjo, S, Nunoya, Y, Kajitani, H, Koizumi, N, Aizawa, K, Machiya, S, Osamura, K
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Conductors (devices)
Current sharing
Cyclic testing
Deflection
Degradation
Exact sciences and technology
Neutron diffraction
Neutron diffraction and scattering
Physics
Solenoids
Strain
Strands
Structure of solids and liquids
crystallography
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Summary:Several conductor samples were fabricated and tested in the SULTAN facility at CRPP for ITER Central Solenoid (CS) conductor qualification. From the result of the cyclic testing on the first and second conductor samples named CSJA01 and CSJA02, continuous linear degradation of the current sharing temperature (Tcs) was found. From the result of the visual inspection, a large deflection on the lower loading side (LLS) in the high field zone (HFZ) was observed. The bending strain of the strands cannot be evaluated from only the deflection obtained visually. To evaluate the strain of strands in CSJA01 quantitatively, a neutron diffraction measurement of the CSJA01 left leg was performed using the engineering materials diffractometer 'Takumi' in J-PARC. From the result, the large bending strain at the LLS in the HFZ was found. Therefore, the Tcs degraded position in the conductor sample due to the cyclic testing can be determined.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/26/8/084002