Abstract
The cooldown of a bath-cooled superconducting coil was analyzed by both experiment and simulation. The coil, which weighed 155 kg and consisted of 14 double pancake coils, was precooled with cold helium gas. The temperature distribution in the coil, the mechanism of heat transfer and the utilization factor of enthalpy of cold helium gas were experimentally studied. From these experimental results and simulations, effective thermal conductivities of the coil as a compound structure and heat transfer coefficients to helium gas were estimated. As a result, it was clear that thermal conductivities were mainly dependent on the electrical insulator and the helium gas between cables, and that the heat transfer was influenced by the velocity of helium gas adjacent to the coil surface.
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