Narrow spin resonance width and spin flip with an rf-bunched deuteron beam.
We used an rf solenoid to study the widths of rf spin resonances with both bunched and unbunched beams of 1.85 GeV/c polarized deuterons stored in the COSY synchrotron. With the unbunched beam at different fixed rf-solenoid frequencies, we observed only partial depolarization near the resonance. However, the bunched beam's polarization was almost fully flipped; moreover, its resonance was much narrower. We then used Chao's recent equations to explain this behavior and to calculate the polarization's dependence on various rf-solenoid and beam parameters. Our data and calculations indicate that a bunched deuteron beam's polarization can behave as if the beam has zero momentum spread.
Morozov
V S
VS
Spin Physics Center, University of Michigan, Ann Arbor, Michigan 48109-1040, USA.
Chao
A W
AW
Krisch
A D
AD
Leonova
M A
MA
Raymond
R S
RS
Sivers
D W
DW
Wong
V K
VK
Kondratenko
A M
AM