title: Emittance and lifetime measurement with damping wigglers.
abstract: National Synchrotron Light Source II (NSLS-II) is a new third-generation storage ring light source at Brookhaven National Laboratory. The storage ring design calls for small horizontal emittance (<1 nm-rad) and diffraction-limited vertical emittance at 12 keV (8 pm-rad). Achieving low value of the beam size will enable novel user experiments with nm-range spatial and meV-energy resolution. The high-brightness NSLS-II lattice has been realized by implementing 30-cell double bend achromatic cells producing the horizontal emittance of 2 nm rad and then halving it further by using several Damping Wigglers (DWs). This paper is focused on characterization of the DW effects in the storage ring performance, namely, on reduction of the beam emittance, and corresponding changes in the energy spread and beam lifetime. The relevant beam parameters have been measured by the X-ray pinhole camera, beam position monitors, beam filling pattern monitor, and current transformers. In this paper, we compare the measured results of the beam performance with analytic estimates for the complement of the 3 DWs installed at the NSLS-II.
authors.affiliation: National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11793, USA.
authors.forename: G M
authors.initials: GM
authors.lastname: Wang
authors.affiliation: National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11793, USA.
authors.forename: T
authors.initials: T
authors.lastname: Shaftan
authors.affiliation: National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11793, USA.
authors.forename: W X
authors.initials: WX
authors.lastname: Cheng
authors.affiliation: National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11793, USA.
authors.forename: W
authors.initials: W
authors.lastname: Guo
authors.affiliation: National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11793, USA.
authors.forename: P
authors.initials: P
authors.lastname: Ilinsky
authors.affiliation: National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11793, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Li
authors.affiliation: National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11793, USA.
authors.forename: B
authors.initials: B
authors.lastname: Podobedov
authors.affiliation: National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11793, USA.
authors.forename: F
authors.initials: F
authors.lastname: Willeke