| アブストラクト: |
National Synchrotron Light Source II (NSLS-II) is a 3-GeV, 792-meter
circumference, high-flux and high-brightness synchrotron radiation
facility to be constructed at Brookhaven National Laboratory. It will
replace the existing NSLS, a two-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. These stringent requirements and their impact on vacuum systems,
as compared with other 3rd generation light sources, will be
described. The design of the storage ring and the vacuum systems will
be presented, with emphasis on beam vacuum chamber design, material
selection, pump arrangement-versus-pressure variation, photon beam
tracking and absorber positioning. Fabrication and evaluation of the
extruded aluminum chamber prototypes will also be described. |
