Investigation of Conduit Materials for Nb 3 Sn CICC’s Mark D. Bird (NHMFL-FSU), DMR 0603042
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Investigation of Conduit Materials for Nb 3 Sn CICC’s Mark D. Bird (NHMFL-FSU), DMR 0603042 Research: Cable-in-Conduit Conductors using Nb 3 Sn are critical to the development of the NHMFL’s Series-Connected Hybrid as well as ITER. Thermal expansion mis-match between the conduit and the Nb 3 Sn wire is of critical importance to the performance of these systems. The NHMFL has characterized the physical properties of various potential conduit materials both for our magnets and for ITER. In particular, a new multi-functional probe has been designed and built for an existing physical property measurement system (PPMS). With this probe, thermal expansions of Nb 3 Sn and a new Japanese Fe-Mn alloy called JK2LB at low temperatures were measured by an extensometer. Measurements of stainless steel 316LN will be Fig. 1 Extensometer Cernox thermometer Feedthrou gh 900 mm -0.05% 0.00% 0.05% 0.10% 0.15% 0.20% 0.25% 0.30% 0.35% 0.40% 0.45% 0 50 100 150 200 250 300 350 T (K ) (L 293 - L )/L 293 B rass Nb3Sn JK 2LB B rass (handbook) Fig. 2 J. Lu, et al.,
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Fig. 2. Fig. 1. Feedthrough. Cernox thermometer. Extensometer. 900 mm. Investigation of Conduit Materials for Nb 3 Sn CICC’s Mark D. Bird (NHMFL-FSU), DMR 0603042. - PowerPoint PPT Presentation
Transcript of Investigation of Conduit Materials for Nb 3 Sn CICC’s Mark D. Bird (NHMFL-FSU), DMR 0603042
Investigation of Conduit Materials for Nb3Sn CICC’s
Mark D. Bird (NHMFL-FSU), DMR 0603042
Research: Cable-in-Conduit Conductors using Nb3Sn are critical to the development of the NHMFL’s Series-Connected Hybrid as well as ITER. Thermal expansion mis-match between the conduit and the Nb3Sn wire is of critical importance to the performance of these systems. The NHMFL has characterized the physical properties of various potential conduit materials both for our magnets and for ITER. In particular, a new multi-functional probe has been designed and built for an existing physical property measurement system (PPMS). With this probe, thermal expansions of Nb3Sn and a new Japanese Fe-Mn alloy called JK2LB at low temperatures were measured by an extensometer. Measurements of stainless steel 316LN will be performed in the near future. Fig. 1 is a picture of the probe. Fig.2 shows the measured thermal expansion of brass, Nb3Sn and JK2LB.
Fig. 1
Extensometer
Cernox thermometer
Feedthrough
900 mm
-0.05%
0.00%
0.05%
0.10%
0.15%
0.20%
0.25%
0.30%
0.35%
0.40%
0.45%
0 50 100 150 200 250 300 350
T (K)
(L29
3- L
)/L
293
Brass
Nb3Sn
JK2LB
Brass (handbook)
Fig. 2
J. Lu, et al.,
Investigation of Conduit Materials for Nb3Sn CICC’s
Mark D. Bird (NHMFL-FSU), DMR 0603042
Broader Impacts: Julio Sosa is an undergraduate student at FSU who works part-time in materials development and characterization at the NHMFL. He was responsible for the implementation of a custom thermal-expansion measurement system for a dilatometer. He retro-fitted a low temperature cryostat into a commercial high-temperature system and designed and implemented mechanical interface features and instrumentation.
Dr. Steven T. Downey, II received his Ph.D. from FSU in 2008 undertaking research on low-carbon 316LN stainless steel suitable for the conduit alloys in the Series-Connected Hybrid.
Daniel Brown is a 2nd year physics undergraduate at Wabash College who came to the NHMFL as part of the REU program. While here he developed the probe for thermal expansion measurements of JK2LB, Nb3Sn and stainless steel using a PPMS.
Daniel Brown
Steven Downey
Julio Sosa
