The Cryogenics Group at Jefferson Lab maintains multiple operating cryogenic plants in three locations.  The primary facility is located inside the accelerator site at the Central Helium Liquefier building (CHL).  Also inside the accelerator site is the End Station Refrigerator (ESR) which supports cryogenic needs in all three experimental halls. In support of the Vertical Test Area (VTA) and Cryomodule Test Cave there is the Cryogenic Test Facility (CTF) located outside the Test Lab (outside the accelerator site) in the main campus area. 

At JLab our cryogenic plants are designed to run 24/7 all year long with minimal maintenance intervals.  Our facilities are unmanned and use a computer based control system for operation. 

PDF presentation on JLab technology, operational systems, collaborations and design philosophies.