title: 99.6% spin-flip efficiency in the presence of a strong Siberian snake.
abstract: We recently studied the spin-flipping efficiency of an rf-dipole magnet using a 120-MeV horizontally polarized proton beam stored in the Indiana University Cyclotron Facility Cooler Ring, which contained a nearly full Siberian snake. We flipped the spin by ramping the rf dipole's frequency through an rf-induced depolarizing resonance. By adiabatically turning on the rf dipole, we minimized the beam loss. After optimizing the frequency ramp parameters, we used 100 multiple spin flips to measure a spin-flip efficiency of 99.63+/-0.05%. This result indicates that spin flipping should be possible in very-high-energy polarized storage rings, where Siberian snakes are certainly needed and only dipole rf-flipper magnets are practical.
authors.affiliation: Spin Physics Center, University of Michigan, Ann Arbor, MI 48109-1120, USA.
authors.forename: B B
authors.initials: BB
authors.lastname: Blinov
authors.forename: Z B
authors.initials: ZB
authors.lastname: Etienne
authors.forename: A D
authors.initials: AD
authors.lastname: Krisch
authors.forename: M A
authors.initials: MA
authors.lastname: Leonova
authors.forename: W
authors.initials: W
authors.lastname: Lorenzon
authors.forename: V S
authors.initials: VS
authors.lastname: Morozov
authors.forename: C C
authors.initials: CC
authors.lastname: Peters
authors.forename: V K
authors.initials: VK
authors.lastname: Wong
authors.forename: K
authors.initials: K
authors.lastname: Yonehara
authors.forename: V A
authors.initials: VA
authors.lastname: Anferov
authors.forename: P
authors.initials: P
authors.lastname: Schwandt
authors.forename: E J
authors.initials: EJ
authors.lastname: Stephenson
authors.forename: B
authors.initials: B
authors.lastname: von Przewoski
authors.forename: H
authors.initials: H
authors.lastname: Sato