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Itoh, Yoshitaka
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article
Influence of Inner Diameter and Height of Ring-Shaped REBaCuO Bulks on Trapped Field and Mechanical Stress during Field-Cooled Magnetization
Abstract
<p>In this paper, the trapped field B<sub>z</sub>, thermal hoop stress σ<sub>θ</sub><sup>cool</sup>by cooling from 300 to 50 K, and electromagnetic hoop stress σ<sub>θ</sub><sup>FCM</sup>during field-cooled magnetization (FCM) from B<sub>app</sub>= 6.3 and 9.4 T are investigated numerically for ring-shaped REBaCuO bulks with various inner diameters (I.D.) and heights (H) and reinforced by an Al alloy ring. For simplicity, an identical critical current density J<sub>c</sub>(B), which is a typical value at 50 K, is assumed in the simulation. The B<sub>z</sub>value at the center of the ring bulk changes depending on the I.D. and H values of the ring bulk, which results from the different distribution of the superconducting current. As a result, the total hoop stress σ<sub>θ</sub><sup>total</sup>(= σ<sub>θ</sub><sup>cool</sup>+ σ<sub>θ</sub><sup>FCM</sup>) also changes for each ring bulk and each B<sub>app</sub>because of the variation of the σ<sub>θ</sub><sup>cool</sup>and σ<sub>θ</sub><sup>FCM</sup>values. The maximum σ<sub>θ</sub><sup>total</sup>value, which affects the bulk fracture at B<sub>app</sub>= 9.4 T, increases with decreasing the height of ring bulk. These results can present guidelines for designing a trapped-field magnet using ring bulks.</p>