Abstract
National Synchrotron Light Source II (NSLS-II) is a 3-GeV, 792-meter circumference, 3rd generation synchrotron radiation facility being constructed at Brookhaven National Laboratory. It will replace the existing NSLS, a three-decade old, 2nd-generation light source. 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-rad. The design of the storage ring and the vacuum systems will be presented, with emphasis on beam vacuum chamber design, fabrication, ultrahigh vacuum pumping arrangement, photon beam tracking, absorber positioning and pressure profiles.
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