Magneto-thermal phenomena in bulk high temperature superconductors subjected to applied AC magnetic fields

Details Magneto-thermal phenomena in bulk high temperature superconductors subjected to applied AC magnetic fields Magneto-thermal phenomena in bulk high temperature superconductors subjected to applied AC magnetic fields

2010-05-08

arxiv.org/abs/1005.1329v1

Physics

Condensed Matter

Superconductivity

32 pages, 6 figures

Scientific paper

In the present work we study, both theoretically and experimentally, the temperature increase in a bulk high-temperature superconductor subjected to applied AC magnetic fields of large amplitude. We calculate analytically the equilibrium temperatures of the bulk sample as a function of the experimental parameters using a simple critical-state model for an infinitely long type-II superconducting slab or cylinder. The results show the existence of a limit heat transfer coefficient (AUlim) separating two thermal regimes with different characteristics. The theoretical analysis predicts a "forbidden" temperature window within which the temperature of the superconductor can never stabilize when the heat transfer coefficient is small. In addition, we determine an analytical expression of two threshold fields Htr1 and Htr2 characterizing the importance of magneto-thermal effects and show that a thermal runaway always occurs when the field amplitude is larger than Htr2. The theoretical predictions of the temperature evolution of the bulk sample during a self-heating process agree well with the experimental data. The simple analytical study presented in this paper enables order of magnitude thermal effects to be estimated for simple superconductor geometries under applied AC magnetic fields and can be used to predict the influence of experimental parameters on the self-heating characteristics of bulk type-II superconductors.

Affiliated with

Also associated with

No associations

Rating

Magneto-thermal phenomena in bulk high temperature superconductors subjected to applied AC magnetic fields does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Magneto-thermal phenomena in bulk high temperature superconductors subjected to applied AC magnetic fields, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magneto-thermal phenomena in bulk high temperature superconductors subjected to applied AC magnetic fields will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-303415