Abstract
The power loss is analytically derived for a long cylinder with a hard superconducting core and a normal conducting shell under an applied ac current of amplitude Im. The core obeys the critical-state model with a constant critical-current density Jc and the shell obeys the Maxwell equations and the Ohm law with a constant permeability μ0 and conductivity σ. The dependence of the normalized ac loss per cycle per unit length upon Im/Ic (Ic being the critical current), the normalized frequency, and the radius-filling fraction of the core are studied. We provide a detailed discussion on the nature of the loss in the shell and the description of its low-frequency low-current limit and high-frequency limit.
Original language | English |
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Pages (from-to) | 16-22 |
Journal | Superconductor Science and Technology |
Volume | 17 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1 Jan 2004 |