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Title: Ternary Nb 3Sn superconductors with artificial pinning centers and high upper critical fields

Abstract

In this letter we demonstrate the development of ternary Nb3Sn multifilamentary conductors with artificial pinning centers (APC) which achieve high critical fields. These recently-developed conductors were tested in a 31 T magnet, and the results showed that their upper critical field ( B c2) values at 4.2 K are 27-28 T, and irreversible field ( B irr) values are above 26 T, values similar to or higher than those of best RRP conductors. The non-Cu J c has been brought to nearly 1200 A/mm –2 at 16 T and 4.2 K, comparable to RRP, in spite of the fact that the fine-grain Nb 3Sn fractions in filaments are still low (20-30%) and the grain sizes are still not fully refined (70-80 nm) due to conductor designs and heat treatments that are not yet optimized. The Nb 3Sn layer J c at 4.2 K, 16 T is 4710 A/mm –2 for the APC wire with 1% Zr, about 2.5 times higher than RRP conductors, in spite of the fact that its grain size is not yet fully refined due to insufficient oxygen and unoptimized heat treatment. An analysis is presented about the non-Cu J c that can be achieved by furthermore » optimizing the APC conductors and their heat treatments.« less

Authors:
ORCiD logo [1];  [2];  [3];  [2];  [3]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. The Ohio State Univ., Columbus, OH (United States)
  3. Hyper Tech Research Inc., Columbus, OH (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1487043
Report Number(s):
arXiv:1810.10569; FERMILAB-PUB-18-572-TD
Journal ID: ISSN 0953-2048; 1700498
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Superconductor Science and Technology
Additional Journal Information:
Journal Volume: 32; Journal Issue: 2; Journal ID: ISSN 0953-2048
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; Nb3Sn superconductors; artificial pinning center; Bc2; critical current density

Citation Formats

Xu, Xingchen, Rochester, Jacob, Peng, Xuan, Sumption, Mike, and Tomsic, Mike. Ternary Nb3Sn superconductors with artificial pinning centers and high upper critical fields. United States: N. p., 2019. Web. doi:10.1088/1361-6668/aaf7ca.
Xu, Xingchen, Rochester, Jacob, Peng, Xuan, Sumption, Mike, & Tomsic, Mike. Ternary Nb3Sn superconductors with artificial pinning centers and high upper critical fields. United States. doi:10.1088/1361-6668/aaf7ca.
Xu, Xingchen, Rochester, Jacob, Peng, Xuan, Sumption, Mike, and Tomsic, Mike. Thu . "Ternary Nb3Sn superconductors with artificial pinning centers and high upper critical fields". United States. doi:10.1088/1361-6668/aaf7ca.
@article{osti_1487043,
title = {Ternary Nb3Sn superconductors with artificial pinning centers and high upper critical fields},
author = {Xu, Xingchen and Rochester, Jacob and Peng, Xuan and Sumption, Mike and Tomsic, Mike},
abstractNote = {In this letter we demonstrate the development of ternary Nb3Sn multifilamentary conductors with artificial pinning centers (APC) which achieve high critical fields. These recently-developed conductors were tested in a 31 T magnet, and the results showed that their upper critical field (B c2) values at 4.2 K are 27-28 T, and irreversible field (B irr) values are above 26 T, values similar to or higher than those of best RRP conductors. The non-Cu J c has been brought to nearly 1200 A/mm–2 at 16 T and 4.2 K, comparable to RRP, in spite of the fact that the fine-grain Nb3Sn fractions in filaments are still low (20-30%) and the grain sizes are still not fully refined (70-80 nm) due to conductor designs and heat treatments that are not yet optimized. The Nb3Sn layer J c at 4.2 K, 16 T is 4710 A/mm–2 for the APC wire with 1% Zr, about 2.5 times higher than RRP conductors, in spite of the fact that its grain size is not yet fully refined due to insufficient oxygen and unoptimized heat treatment. An analysis is presented about the non-Cu J c that can be achieved by further optimizing the APC conductors and their heat treatments.},
doi = {10.1088/1361-6668/aaf7ca},
journal = {Superconductor Science and Technology},
issn = {0953-2048},
number = 2,
volume = 32,
place = {United States},
year = {2019},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on January 3, 2020
Publisher's Version of Record

Figures / Tables:

Figure 1 Figure 1: The R-B curves of the two reference wires and the three APC samples.

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.