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National Synchrotron Light Source II (NSLS-II) is a proposed 3-GeV, 780-meter circumference, high-flux and high-brightness synchrotron radiation facility, being designed at United States Department of Energy's Brookhaven National Laboratory. It will replace the present NSLS, a two-decade old 2nd-generation light source, and allow facility users to efficiently conduct cutting edge research using highly-focused photon beams from the storage ring. To deliver photon beams with < 1 nm spatial resolution and 0.1 meV energy resolution for the users, NSLS II will have extremely high brightness, flux and stability; and ultra low emittance of ≤ 1 nm. The design of the storage ring and the vacuum systems will be presented, with emphasis on vacuum chamber design, material selection, pump arrangement verses pressure variation, photon beam tracking and absorber positioning. |