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This content will become publicly available on January 24, 2019

Title: Improvement of stability of Nb 3 Sn superconductors by introducing high specific heat substances

High-J c Nb 3Sn conductors have low stability against perturbations, which accounts for the slow training rates of high-field Nb 3Sn magnets. While it is known that adding substances with high specific heat (C) into Nb 3Sn wires can increase their overall specific heat and thus improve their stability, there has not been a practical method that is compatible with the fabrication of long-length conductors. In this work, we put forward a scheme to introduce such substances to distributed-barrier Nb 3Sn wires, which adds minimum difficulty to the wire manufacturing process. Multifilamentary wires using a mixture of Cu and high-C Gd 2O 3 powders have been successfully fabricated along this line. Measurements showed that addition of Gd 2O 3 had no negative effects on residual resitivity ratio or non-Cu J c, and that flux jumps were remarkably reduced, and minimum quench energy values at 4.2 K, 14 T were increased by a factor of three, indicating that stability was significantly improved. We also discussed the influences of the positioning of high-C substances and their thermal diffusivity on their effectiveness in reducing the superconductor temperature rise against perturbations. Based on these results, we proposed an optimized conductor architecture to maximize themore » effectiveness of this approach.« less
Authors:
ORCiD logo [1] ;  [1] ;  [1] ;  [2]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. Hyper Tech Research Inc, Columbus, OH (United States)
Publication Date:
Report Number(s):
FERMILAB-PUB-17-573-TD
Journal ID: ISSN 0953-2048; 1650513; TRN: US1801491
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
Superconductor Science and Technology
Additional Journal Information:
Journal Volume: 31; Journal Issue: 3; Journal ID: ISSN 0953-2048
Publisher:
IOP Publishing
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS
OSTI Identifier:
1420417