The cold side of DarkSide, part 2

See part 1. The DarkSide time projection chamber was installed in its cryostat and then lowered into the center of a 4-meter-diameter metal sphere, which will be filled with liquid scintillator. The liquid scintillator is used to identify neutrons, which are a background to the dark-matter search. See part 3. Photo: Yury Suvorov, UCLA