99.6% spin-flip efficiency in the presence of a strong Siberian snake.
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.
Blinov
B B
BB
Spin Physics Center, University of Michigan, Ann Arbor, MI 48109-1120, USA.
Etienne
Z B
ZB
Krisch
A D
AD
Leonova
M A
MA
Lorenzon
W
W
Morozov
V S
VS
Peters
C C
CC
Wong
V K
VK
Yonehara
K
K
Anferov
V A
VA
Schwandt
P
P
Stephenson
E J
EJ
von Przewoski
B
B
Sato
H
H