High Critical Current Densities in Nb3Sn Films with Engineered Microstructures — Artificial Pinning Microstructures

Dietderich, D.R.; Kelman, Maxim B.; Litty, J. R.; Scanlan, R.M.

doi:10.1007/978-1-4757-9056-6_125

Cited by 14 publications

(12 citation statements)

References 3 publications

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“…The key origin of this performance limitation is intrinsic and determined by the upper critical field ( B c2 ) of Nb 3 Sn of 30 T [7]. The high-field critical current-density of Nb 3 Sn wires can in principle be improved significantly by reducing the grain-size to around 10 to 20 nm and thereby improving the high-field pinning efficiency [8, 9], and this potential can be estimated (figure 1). Such fine-grain wires are presently not commercially available, although promising results have been demonstrated [10].…”

Section: Introductionmentioning

confidence: 99%

A feasibility study of high-strength Bi-2223 conductor for high-field solenoids

Godeke

Abraimov

Arroyo

et al. 2017

Supercond. Sci. Technol.

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We performed a feasibility study on a high-strength Bi2−xPbxSr2Ca2Cu3O10−x (Bi-2223) tape conductor for high-field solenoid applications. The investigated conductor, DI-BSCCO Type HT-XX, is a pre-production version of Type HT-NX, which has recently become available from Sumitomo Electric Industries (SEI). It is based on their DI-BSCCO Type H tape, but laminated with a high-strength Ni-alloy. We used stress-strain characterizations, single- and double-bend tests, easy- and hard-way bent coil-turns at various radii, straight and helical samples in up to 31.2 T background field, and small 20-turn coils in up to 17 T background field to systematically determine the electro-mechanical limits in magnet-relevant conditions. In longitudinal tensile tests at 77 K, we found critical stress- and strain-levels of 516 MPa and 0.57%, respectively. In three decidedly different experiments we detected an amplification of the allowable strain with a combination of pure bending and Lorentz loading to ≥ 0.92% (calculated elastically at the outer tape edge). This significant strain level, and the fact that it is multi-filamentary conductor and available in the reacted and insulated state, makes DI-BSCCO HT-NX highly suitable for very high-field solenoids, for which high current densities and therefore high loads are required to retain manageable magnet dimensions.

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Section: Introductionmentioning

confidence: 99%

A feasibility study of high-strength Bi-2223 conductor for high-field solenoids

Godeke

Abraimov

Arroyo

et al. 2017

Supercond. Sci. Technol.

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“…In figure 3.6, it is illustrated that in NbTi the pinning force peaks at a higher reduced magnetic field, which is desirable for high field applications. It was previously demonstrated that pinning in Nb 3 Sn can be improved substantially through ternary additions in thin films by Dietderich et al [116] and Godeke et al [115], which could lead to a future method for improving the pinning properties of Nb 3 Sn wires.…”

Section: Differences Between J C Parameterizations Of Nb-ti and Nb 3 Snmentioning

confidence: 99%

An experimental and computational study of srain sensitivity in superconducting Nb3Sn

Mentink

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This work is the result of efforts by many people, both in a professional and a personal sense. During my time in Berkeley I had the opportunity to work with friendly and supportive people who were pushing back scientific boundaries, regarding the limits of superconducting high field technology. It is an odd but good experience to read papers from various authors detailing one scientific breakthrough or another, and then to meet them in person. Being a multi-cultural hub, Berkeley also allowed me to meet and become friends with people from all corners of this planet.Along the way, people have been instrumental in making this research happen. At LBNL, Jonathan Slack, Reuben Mendelsberg, and Andre Anders allowed me to use their lab for a rather extended period of time thus allowing for the fabrication of thin films, and have helped in various other ways along the years. The people at Ohio State University have helped by repeatedly performing heat capacity measurements on Nb 3 Sn bulk samples which were kindly supplied by Wilfried Goldacker of the Karlsruhe Institute of Technology. In particular I would like to thank Mike Susner of the Ohio State University, who came to the lab in the weekends just to make sure my samples would get measured. John Bonevich of the National Institute of Science and Technology was kind enough to perform characterization work on some of the Nb-Sn thin films we made, which included the STEM image on the cover. A lot of the experimental work was made possible with software and hardware designed at the University of Twente (such as VI by Bennie ten Haken), and I have gotten useful recommendations and assistance along the way, such as the advice on thin film fabrication from Frank Roesthuis. Professors Marcel ter Brake, Herman ten Kate, David Larbalestier, and Frances Hellman were kind enough to write letters of recommendation which contributed to getting the CSC student fellowship award. Vladimir Kresin of LBNL was kind enough to answer various questions related to the microscopic properties of Nb 3 Sn and comment on the description of microscopic theory in this thesis.Shane Cybart and Stephen Wu have assisted Edwin Dollekamp and myself in attempting to do some very fancy experiments. Edwin, from the University of Twente, took on a complicated research topic and I was impressed with how far he managed to get in that work, and Shane and Stephen invested time in the evenings and weekends to make it happen. Professor Orlandos previous investigations of Nb 3 Sn were an inspiration for some of the work described in this thesis, and he was kind enough to answer questions by email and over the phone. Derek Stewart of the Cornell NanoScale Science and Technology Facility helped me to get familiar with density functional theory calculations and computing clusters and made the suggestion of using Quantum Espresso ab-initio software. Robert Ryne and Steve Gourlay of LBNL helped me getting access to sizeable supercomputing resources at NERSC which were needed for this research.My friends and family st...

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“…The highest current densities achieved at 12T were 3200 amp/mm 2 in the layer. Work by Dietderich et al 15 gave a lower limit on current density in the layer of 7000 amps/mm 2 at 12T. This assumed that all the niobium was reacted hence a lower bound.…”

Section: Current Densitymentioning

confidence: 99%

A HIgh Current Density Low Cost Niobium 3 Tin Titanium Doped Conductor Utilizing A Novel Internal Tin Process

Zeitlin¹

2005

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An internal tin conductor has been developed using a Mono Element Internal Tin (MEIT) with an integral Nb barrier surrounding the Nb filaments. High current densities of 3000 A/mm 2 + at 12 T and 1800 A/mm 2 at 15 T have been achieved in conductors as small as 0.152 mm with the use of Nb7.5Ta filaments and Ti in the Sn core. In contrast, conductors with pure Nb and Ti in the Sn achieved 2700 A/mm 2 at 12 T. Two internal fins, developed and patented on the project, were introduced into the filament array and reduced the effective filament diameter (D eff ) by 38%. Additional fins will further reduce D effThe conductor was produced from 152.4 mm diameter billets to produce wire as small as 0.152 mm. The process promises be scaleable to 304 mm diameter billets yielding wire of 0.304 mm diameter. The MEIT process wire was easy to draw with relatively few breaks. The cost of this conductor in large production quantities based on the cost model presented could meet the 1.5 $/kilo amp meter(KAM) target of the HEP community. NOTICEThis report was prepared as an account of work sponsored by the United States Government. Neither the United States nor the United States Department of Energy, nor any of their employees, nor any of their awardees, subcontractors, or their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product or process disclosed or represents that its use would not infringe privately-owned rights. IntroductionThe High Energy Physics community has been encouraging and sponsoring the development of Superconductors for Accelerator applications for over forty years. The Superconducting Tevatron at Fermilab and the Large Hadron Collider (LHC) under construction at CERN are evidence that these efforts have born fruit. The community could say that superconductors have been an enabling technology for many of the discoveries over the last several decades.

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High Critical Current Densities in Nb3Sn Films with Engineered Microstructures — Artificial Pinning Microstructures

Cited by 14 publications

References 3 publications

A feasibility study of high-strength Bi-2223 conductor for high-field solenoids

A feasibility study of high-strength Bi-2223 conductor for high-field solenoids

An experimental and computational study of srain sensitivity in superconducting Nb3Sn

A HIgh Current Density Low Cost Niobium 3 Tin Titanium Doped Conductor Utilizing A Novel Internal Tin Process

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