Recent Progress with APC Nb₃Sn Conductors [Slides]

Technical Report · Mon Oct 29 04:00:00 EDT 2018

DOI:https://doi.org/10.2172/1508015· OSTI ID:1508015

Xu, Xingchen ^[1]; Peng, Zuan ^[2]; Rochester, Jacob ^[3]; Sumption, Mike ^[3]

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1. Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
2. Hyper Tech Research, Inc., Columbus, OH (United States)
3. The Ohio State Univ., Columbus, OH (United States)

1.Development of APC-PIT multi wires started in 2017. Since then progress has been fast; 2.Tests up to 31 T at 4.2 K show that B_irr is 26-27 T, B_c2 is 27-28 T, ~1-2 T higher than RRP; 3. R&D in the past two years has led to significant improvement of wire recipe and quality. The non-Cu J_c is on similar level with present RRP wires, in spite that the Nb₃Sn % is still low and grain size is not fully refined due to unoptimized wire recipe and heat treatment; 4.The Nb₃Sn layer J_c at 16 T is ~2.5 times of RRP despite grain size not fully refined; 5.The improvement is still ongoing. The following levels are expected: 1) By improving conductor recipe and quality and heat treatment, the fine-grain Nb₃Sn fraction can be increased to ~40%, as in standard tube type and PIT wires; 2) By optimizing O content and heat treatment, the grain size can be reduced to 50-65 nm or less, which leads to a Nb₃Sn layer J_c of 5000-6000 A/mm² for 4.2 K, 16 T. If so, this means the 4.2 K, 16 T non-Cu Jc can reach 2000-2400 A/mm². This will surpass the FCC spec and also provide >30% margin. Above 16 T, the APC conductors should give extra Jc gain due to higher B_irr and shift in F_p-B curve peak to higher fields.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1508015
• Report Number(s): FERMILAB-SLIDES-18-129-TD; oai:inspirehep.net:1730278
• Country of Publication: United States
• Language: English

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