Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1508001 | Cryogenics | 2009 | 4 Pages |
Abstract
This paper evaluates the losses of current leads made of various metals used in high-Tc superconducting power apparatuses operating at liquid nitrogen temperatures. The heat flow into liquid nitrogen conducting adiabatic current leads was measured by the nitrogen boil-off method. The results were used to derive average Lorenz numbers for metals between room temperature and liquid nitrogen temperatures. The average Lorenz number is a good index of performance of current leads. A theory of loss evaluation of current leads using the average Lorenz number and a method for the optimum current lead design were described as well. In addition, the loss of current leads made of Bi2223/Ag tape conductors was evaluated above the liquid nitrogen temperature, and a higher efficiency was achieved than with pure metal current leads.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Mitsuho Furuse, Koh Agatsuma, Shuichiro Fuchino,