Abstract
Usually the critical current of an HTS magnet is defined as an operation current at which the average electric field in the coil equals 0.1 μV/cm. However, the power dissipation may be considerable even at subcritical currents and disturb the critical current measurement in magnets having a resistive joint or wound of a nonhomogeneous conductor. The local increase in the temperature around the weak point can expose the coil to a possible damage. In this paper the influence of the temperature increase due to a resistive joint on the current–voltage characteristic of a Bi-2223/Ag μ-SMES magnet is studied. The high-resistivity joint was realized between the current terminal and the bottom pancake of the magnet. The 3D temperature distribution inside the coil is simulated by solving a quasi-linear heat conduction equation with the finite element method. The measured and computed results are compared at the operation temperatures of 20, 40 and 56 K. Based on the results the issues related to HTS magnet protection are discussed.
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