Title :
Magnetothermal instabilities in cylindrical melt-textured Y-Ba-Cu-O
Author :
Wenger, Ch ; Gladun, A. ; Krabbes, G. ; Fuchs, G.
Author_Institution :
Inst. fur Tieftemperaturphysik, Tech. Univ. Dresden, Germany
fDate :
3/1/2001 12:00:00 AM
Abstract :
The magnetothermal flux jump instabilities of the critical state in cylindrical melt-textured Y-Ba-Cu-O samples are investigated during the magnetization process. The flux jumps result in a drastic reduction of the magnetization accompanied by a strong heating of the sample. We determine the first flux jump field as function of the parameters, which influence the stability, such as the heat transfer coefficient between the surface of the sample and the surrounding, the sweep rate of the external field and the temperature of the sample. The comparison of the thermal and magnetic diffusivity of the melt-textured material indicates isothermal behavior of the flux jump scenario, supporting a dynamic stability criterion
Keywords :
barium compounds; critical phenomena; flux flow; heat transfer; high-temperature superconductors; magnetisation; magnetocaloric effects; yttrium compounds; Y-Ba-Cu-O; critical state; cylindrical melt-textured Y-Ba-Cu-O; cylindrical melt-textured Y-Ba-Cu-O samples; dynamic stability criterion; first flux jump field; flux jumps; heat transfer coefficient; heating; isothermal behavior; magnetic diffusivity; magnetization process; magnetothermal flux jump instabilities; magnetothermal instabilities; melt-textured material; stability; sweep rate; Heat transfer; Heating; Isothermal processes; Magnetic flux; Magnetic materials; Magnetization processes; Stability criteria; Temperature; Thermal stability; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
