Low field critical current density of titanium sheathed magnesium diboride wires

Low field critical current density of titanium sheathed magnesium diboride wires. Rostila, L., Grasso, G., Demenčík, E., Tumino, A., Brisigotti, S., & Kováč, P. Journal of Physics: Conference Series, 234(2):022029, 2010.

Paper abstract bibtex

Magnesium diboride (MgB 2 ) is replacing some of the conventional superconductors due to its low cost and availability in kilometer lengths. MgB 2 has also been considered for AC applications. In order to model the AC losses and the critical currents of the applications, intrinsic J c (B)-dependence is an important factor also at low fields. In this work J c (B)-dependence of an MgB 2 sample is extracted from the standard in field voltage-current measurements. The proposed method is applied to a non magnetic titanium sheathed sample at 16 and 20 K and a simple formula for J c ( B ) aligns with the measurements. In the fitting process, the critical current distribution inside the wire is numerically simulated in order to take the self field of the sample into account. Moreover, the same formula aligns with measurements of a different sample. These critical current measurements, performed at 4.2 K, were based on magnetization. In the self field computations, the superconducting cross section must be determined accurately. Therefore, we tailored an image processing tool for MgB 2 wires to obtain the geometry from a photograph.

@article{ Rostila:JOPCS10,
  abstract = {Magnesium diboride (MgB 2 ) is replacing some of the conventional superconductors due to its low cost and availability in kilometer lengths. MgB 2 has also been considered for AC applications. In order to model the AC losses and the critical currents of the applications, intrinsic J c (B)-dependence is an important factor also at low fields. In this work J c (B)-dependence of an MgB 2 sample is extracted from the standard in field voltage-current measurements. The proposed method is applied to a non magnetic titanium sheathed sample at 16 and 20 K and a simple formula for J c ( B ) aligns with the measurements. In the fitting process, the critical current distribution inside the wire is numerically simulated in order to take the self field of the sample into account. Moreover, the same formula aligns with measurements of a different sample. These critical current measurements, performed at 4.2 K, were based on magnetization. In the self field computations, the superconducting cross section must be determined accurately. Therefore, we tailored an image processing tool for MgB 2 wires to obtain the geometry from a photograph.},
  author = {L. Rostila and G. Grasso and E. Demenčík and A. Tumino and S. Brisigotti and P. Kováč},
  date-added = {2012-02-16 10:33:44 +0100},
  date-modified = {2012-02-16 10:33:44 +0100},
  journal = {Journal of Physics: Conference Series},
  number = {2},
  pages = {022029},
  title = {Low field critical current density of titanium sheathed magnesium diboride wires},
  url = {http://stacks.iop.org/1742-6596/234/i=2/a=022029},
  volume = {234},
  year = {2010},
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