Abstract
Abstract The evaporation rate of liquid helium from a large (8” neck) superinsulated dewar is measured for various cryostat baffle configurations and vent rates through vapor cooled magnet leads. The evaporation rate of helium is almost linearly dependent on baffle number, but no support for the practice of placing edge rings on these battles was found. The addition of large magnet leads provided the major heat leak. Vapor cooling of these leads in the case of zero current did little to diminish the evaporation rate.
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