Laurent, P and Fagnard, JF and Mathieu, JP and Meslin, S and Noudem, JG and Cloots, R and Ausloos, M and Vanderbemden, P (2006) Study of thermal effects in bulk RE-BCO superconductors submitted to a variable magnetic field. Journal of Physics: Conference Series, 43. pp. 505-508. ISSN 1742-6588Full text not available from this repository.
When bulk RE-BCO superconductors are used as permanent magnets in engineering applications, they are likely to experience transient variations of the applied magnetic field. The resulting vortex motion may cause a significant temperature increase. As a consequence the initial trapped flux is reduced. In the present work, we first focus on the cause of a temperature increase. The temperature distribution within a superconducting finite cylinder subjected to an alternating magnetic field is theoretically predicted. Results are compared to experimental data obtained by two temperature sensors attached to a bulk YBCO pellet. Second, we consider curative methods for reducing the effect of heat flux on the temperature increase. Hall-probe mappings on YBCO samples maintained out of the thermal equilibrium are performed for two different morphologies : a plain single domain and a single domain with a regularly spaced hole array. The drilled single-domain displays a trapped induction which is weakly affected by the local heating while displaying a high trapped field. © 2006 IOP Publishing Ltd.
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