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APC Nb3Sn superconductors based on internal oxidation of Nb–Ta–Hf alloys

Journal Article · · Superconductor Science and Technology
 [1];  [2];  [1];  [3];  [4];  [4];  [3]
  1. Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
  2. Hyper Tech Research Incorporated, Columbus, OH (United States)
  3. The Ohio State University, Columbus, OH (United States)
  4. Florida State University, Tallahassee, FL (United States). National High Magnetic Field Laboratory (MagLab)
In the last few years, a new type of Nb3Sn superconducting composite, containing a high density of artificial pinning centers (APC) generated via an internal oxidation approach, has demonstrated a significantly superior performance relative to present, state-of-the-art commercial Nb3Sn conductors. This was achieved via the internal oxidation of Nb-4at.%Ta-1at.%Zr alloy. On the other hand, our recent studies have shown that internal oxidation of Nb–Ta–Hf alloys can also lead to dramatic improvements in Nb3Sn performance. Here in this work we follow up on this latter approach, fabricating a 61-stack APC wire based on the internal oxidation of Nb-4at.%Ta-1at.%Hf alloy, and compare its critical current density (Jc) and irreversibility field with APC wires made using Nb-4at.%Ta-1at.%Zr. A second goal of this work was to improve the filamentary design of APC wires in order to improve their wire quality and electromagnetic stability. Our new modifications have led to significantly improved residual resistivity ratio and stability in the conductors, while still keeping non-Cu Jc at or above the conductor Jc specification required by the proposed Future Circular Collider. Further improvement via optimization of the wire recipe and design is ongoing. Finally, additional work needed to make APC conductors ready for applications in magnets is discussed.
Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
Grant/Contract Number:
AC02-07CH11359; SC0017755
OSTI ID:
1908200
Report Number(s):
FERMILAB-PUB--22-576-TD; arXiv:2301.02571; oai:inspirehep.net:2621312
Journal Information:
Superconductor Science and Technology, Journal Name: Superconductor Science and Technology Journal Issue: 3 Vol. 36; ISSN 0953-2048
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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