Flux-Flow Studies and Stability Criteria of Nb-Ti Strips
One of the aims in the development of stabilized superconductors was the construction of magnets with performance predictable from measurements on short samples. It was believed that when the critical current was exceeded, the stabilized superconductors entered the current sharing regime or flux-flow state which was terminated only when the power dissipation exceeded the maximum heat flux in nucleate boilings q ̇ n . Because q ̇ n is. geometry dependent , environment dependent , sensitive to surface conditions , and difficult to measure accurately , a range of reported values for commercial material was not unduly alarming. However, recent careful measurements with controlled heat transfer conditions have revealed that the stability conditions, even for large copper-to-superconducting ratios, are quite complicated and a knowledge of q ̇ n is not always sufficient to explain the take-off or sudden transition from flux flow to complete normality .
KeywordsPower Dissipation Normal Zone Flux Flow Linear Temperature Dependence Maximum Heat Flux
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