is for cryostat,

so icy and cold!

A cryostat is an apparatus that keeps things very cold. Many pieces of particle physics experiments work only when they’re chilled to very low temperatures, as little as a few degrees above absolute zero. Cryostats keep superconducting materials cold enough to conduct electricity without resistance, and they can keep particle detectors cold enough to register even the most miniscule deposits of energy from particles such as dark matter.