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Description
The National Synchrotron Light Source-II is an electron storage ring with a circumference of 792 m located at Brookhaven National Laboratory (BNL) in Upton, N.Y. The fourth-generation light source with an electron beam of 3 GeV using current up to 500 mA will be able to produce high intensity X-ray radiation and high-intensity infrared, as well as visible and ultraviolet light. The storage ring contains two superconducting radio frequency sections that will boost electrons during their circulation. These two SC RF sections are cooled by liquid helium supplied from an independent cryogenic system.
The cryogenic system is a closed loop helium system that consists of compressors, liquefier/refrigerator (Cold Box), manifold box, and a valve box. The system liquifies gaseous helium to a temperature of 4 K and delivers to the SC RF cavities by means of vacuum jacketed transfer lines. Beginning in 2017, the cryogenic system has undergone a number of upgrades, including the addition of a second valve box, a fourth buffer tank, an inline helium purifier and a Bonitron capacitor backup for our compressors. In addition, the manufacturing of a second Cold Box and Dewar are underway and scheduled for a 2024 installation.
