A comparison of Superconductor Critical Currents
	Engineering Critical Current Density vs. Applied Field - Oct 2008 Includes more extensive annotations than previous versions as well as cross-sections of the composites. 976x648 169 kB PNG 1300x864 278 kB PNG 394 kB Powerpoint File + References 133 kB Excel Worksheet + References References: YBCO: Tape, || Tape-plane, SuperPower (Used in NHMFL tested Insert Coil 2007). Source: Zhijun Chen (NHMFL). 50% Adjustment for 2 to 1 µm production layer YBCO: Tape, |_ Tape Plane, testing as for Tape II Nb-47Ti: 0-6 T - Boutboul et al. MT-19, T. Boutboul et al., Critical Current Density in Superconducting Nb-Ti Strands in the 100 mT to 11 T Applied Field Range," IEEE Transactions on Applied Superconductivity, vol. 16(2)pp. 1184-1187, 2006 Nb-47Ti 5-8 T Maximal: Nb-Ti: Max @4.2 K for whole LHC NbTi strand production (CERN-T. Boutboul '07) Bi-2212: OST 2212 wire 0.8 mm, 28% ceramic, 0 to 10 T data taken at OST, 11.5 to 45 T data taken in NHMFL hybrid Nb3Sn (RRP): Non-Cu Jc Internal Sn OI-ST RRP 1.3 mm, J. A. Parrell et al., "High field Nb3Sn conductor development at Oxford Superconducting Technology," IEEE Transactions on Applied Superconductivity, vol. 13(2:3),pp.3470-3473, 2003 and J. A. Parrell et al., "Nb3Sn Conductor Development for Fusion and Particle Accelerator Applications," Adv. Cryo. Eng. (AIP), vol. 50, pp. 369-375, 2004 Nb3Sn (High Sn Bronze): T. Miyazaki et al. MT18 - fig3, "Development of High Sn Content Bronze Processed Nb3Sn SuperconductingWire for High Field Magnets," IEEE Transactions On Applied Superconductivity, Vol. 14, No. 2, June 2004 MgB2: 19 Fil RW - Hypertech 24% Fill data courtesy MikeTomsic 10/25/07 Links to ASC, MT and ICMC Proceedings can be found on the conferences page.
	Critical Current Density vs. Applied Field: Light Color Version - June 2008 1078x636 142 kB PNG 336 kB Powerpoint File + References 202 kB Excel File + References

A Best-of-Breed Comparison of Superconductor Critical Currents for 100 m length capable material

Light Version - December 12, 2002 66 KB PDF US Letter 66 KB PDF A4 Size 121 KB Powerpoint 75 KB GIF 1200 X 900 x 16 col

Update History - Opens in a new window

Critical current density values are all normalized to the superconductor cross-section and are in A/mm² (the units most commonly used for magnet applications). The criterion used for determining critical current measurement is not consistent, especially in the case of HTS superconductors.

Edited version of comparison between Bulk Pinning Force and Field of a Superconductor

200 KB PDF Updated February 24th 2003

Advances in Critical Current Density in Nb-Ti Superconductors at 4.2

59 KB PDF

compiled the data and generated the graphs

A set of empirical relations has been developed that have proven to describe the critical surface of Nb₃Sn superconductors with very high accuracy. Typical standard deviations amount to 1 % for applied fields ranging from 1 to 13 T, temperatures ranging from 4 K up to the critical temperature and the complete axial compressive strain regime. This set of equations has been employed to develop a Scaling Spreadsheet based on a Microsoft Excel Visual Basic programming code that contains direct calculations of I_c, B_c2* and T_c values as function of a limited set of input parameters. It enables the user to accurately inter- or extrapolate data from a limited set of measured critical current values for an unknown Nb₃Sn strand material.
The code is "open source" so that the user has the opportunity to modify the equations for his/her specific requirements.

	Spreadsheet - October 25, 2005 74 KB Scaling Spreadsheet: Excel Format 24 KB Zip compressed file containing Excel spreadsheet
	References - Arno Godeke thesis at http://www.asc.wisc.edu/publications/pdfthesesnew.htm and http://lt.tnw.utwente.nl Performance Boundaries in Nb3Sn Superconductors: Arno Godeke - 2005 (9.8MB)

Adobe Acrobat© Reader™ Required to view the papers.