Long sample high sensitivity critical current measurements under strain

Walters, C.R.; Davidson, Iain; Tuck, G.E.

doi:10.1016/0011-2275(86)90085-8

Cited by 86 publications

(95 citation statements)

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“…The new apparatus allows us to measure the strand in compression and tension to cover a range of applied strain typically from −1 % to +1 %, based on Cheggour's original design [18,19] ("Durham probe" using a "Walter's spring" technique [20]). The variable temperature design utilizes our high-rate helium gas flow and gas temperature pre-regulation approach that was developed at NIST.…”

Section: New Variable Strain/temperature/magnetic-field Apparatusmentioning

confidence: 99%

“…The magnetic field was swept from 0 to 16 T, and then back to 0 T again. We used fixed temperatures of 4, 4.5, 5,6,7,8,9,10,11,12,14,16,18,20,25,30,35, 40 and 76 K. Measurements at 4, 4.5, and 5 K were done in liquid helium and those at 76 K were done in liquid nitrogen. Our re-entrant Dewar can be filled with a liquid cryogen, pressurized, and heated to change the temperature of the cryogen.…”

Section: Magnetoresistance Of Resistive Thermometersmentioning

confidence: 99%

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Final Technical Report

Goodrich¹

2011

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Section: New Variable Strain/temperature/magnetic-field Apparatusmentioning

confidence: 99%

Section: Magnetoresistance Of Resistive Thermometersmentioning

confidence: 99%

Final Technical Report

Goodrich¹

2011

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“…17,18 The OD of the spring is 39 mm. Following the reaction HT, the Nb 3 Sn wire is wound on the WASP and soldered to the current terminals at both ends.…”

Section: B Measurementsmentioning

confidence: 99%

Improvement of electromechanical properties of an ITER internal tin Nb3Sn wire

Mondonico

Seeber

Senatore

et al. 2010

Journal of Applied Physics

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The critical current of an internal tin Nb 3 Sn wire developed by Oxford Instruments, Superconducting Technology for International Thermonuclear Experimental Reactor ͑ITER͒ ͑OST type-I, billet No. 7567͒ has been studied under axial strain at fields between 12 and 19 T at 4.2 K. Simulating the situation in a cable in conduit, where thermally induced compressive strain is important, a single wire ͑strand͒ was jacketed with AISI 316L stainless steel. The reinforced wire shows an important increase in m , the applied strain where I c reaches its maximum, from 0.25% to 0.57%. In addition the irreversibility limit, irr , is improved from 0.50% applied strain to Ͼ1.10%. It could also be shown that the I c at zero intrinsic strain is almost identical. This demonstrates that jacketing does not influence the physical parameters of the original wire. Experimental data of the bare wire has been well fitted by different strain functions. However, it was not possible to model the data of the jacketed wire. There are indications that only models which take into account the multidimensional character of strain are able to describe the behavior but further development is required.

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“…Well-known tools are the PACMAN, developed by Godeke et al [107] and the Walters spring, developed by Walters et al [108]. The main difference of these tools with the U-spring test rig is the larger length of the homogeneously strained region, which allows for a more homogeneously distributed current inside the conductor as well as a higher voltage resolution, which sometimes is an advantage.…”

Section: Tools For Measuring Temperature Magnetic Field and Uni-aximentioning

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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Long sample high sensitivity critical current measurements under strain

Cited by 86 publications

References 1 publication

Final Technical Report

Final Technical Report

Improvement of electromechanical properties of an ITER internal tin Nb3Sn wire

An experimental and computational study of srain sensitivity in superconducting Nb3Sn

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