TaバリアMgB2線材を用いた小コイルの熱的安定性

概要

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We have fabricated a small test coil with an AIN former by employing Cu-Ni sheathed Ta barrier MgB2 multifilamentary wire made in a wind-and-react process. An overcurrent was applied to the coil conduction-cooled in an initial temperature range between 10K and 30K to investigate its thermal stabi1ity by measuring temperature distribution in the winding and the terminal voltage after the application of overcurrent. The experimental results show that permissive temperature rise without thermal runaway decreases with the initial temperature, while total heat generation for the thermal runaway has a maximum at an initial temperature around 14K. We also numerically calculated the responses of the test coil to the overcurrent by simulating the electrical and the thermal process with a finite e1ement method and V-1 characteristics of the coil. The comparisons with the experimental results show that the electrical and thermal responses are rather well reproduced by the numerical model.