Abstract
The Engineering Test Model (ETM) is a facility storing 20 MWh and serving as technology demonstration for Superconducting Magnetic Energy Storage (SMES). The coil, 96 meters in diameter, operates in superfluid helium at 1.8 K, and is based on a 200 kA cable-in-conduit conductor (CICC). Despite the size of the device, the refrigeration system for the ETM is well within the state-of-the-art, yet certain specific requirements affected the design and optimization of the refrigerator and cryogenic systems.
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