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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Hiltunen, I. Lehtonen, J. Stenvall, A. Mikkonen, R. |
| Copyright Year | 2002 |
| Abstract | Knowledge of the voltage current characteristics, and especially n-values, is very important for the development of superconducting applications such as NMR-magnets and fault current limiters. n-values are usually determined by fitting the power law into a measured voltage-current-characteristics (V(I)) of a sample. However, the sample warms due to resistive losses even at subcritical currents, and thereby, measuring accurate characteristics at overcritical currents has proven to be difficult. Previously, we have developed a mathematical method to determine the critical current and n-value of a poorly cooled short sample. In this paper, we test this method with two samples of different materials in different cooling conditions. V(I) -curves of a MgB2 tape were measured at 30 K in vacuum environment and of a Bi-2223/Ag tape at 73 K in gas cooled environment to verify the effect of warming during the sample characterization. With high currents and slow current ramps the sample warmed up the most distorting the n-value significantly. However, when correction method was applied acceptable results were obtained from all samples. |
| Sponsorship | Council on Superconductivity Appl. Superconductivity Conference Inc MIT |
| Starting Page | 1597 |
| Ending Page | 1600 |
| Page Count | 4 |
| File Size | 211404 |
| File Format | |
| ISSN | 10518223 |
| Volume Number | 20 |
| Issue Number | 3 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2010-06-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Distortion measurement Current measurement Critical current Voltage Heating High temperature superconductors Shape measurement Loss measurement Electromagnetic measurements Superconductivity sample characterization Conduction cooled critical current HTS index loss ${\rm MgB}_{2}$ |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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