Phase Measurement for Driven Spin Oscillations in a Storage Ring
AbstractThis paper reports the first simultaneous measurement of the horizontal and
vertical components of the polarization vector in a storage ring under the
influence of a radio frequency (rf) solenoid. The experiments were performed
at the Cooler Synchrotron COSY in Jülich using a vector polarized,
bunched 0.97 GeV /c deuteron beam. Using the new spin feedback system,
we set the initial phase difference between the solenoid field and the
precession of the polarization vector to a predefined value. The feedback
system was then switched off, allowing the phase difference to change over
time, and the solenoid was switched on to rotate the polarization vector.
We observed an oscillation of the vertical polarization component and the
phase difference. The oscillations can be described using an analytical model.
The results of this experiment also apply to other rf devices with
horizontal magnetic fields, such as Wien filters. The precise manipulation
of particle spins in storage rings is a prerequisite for measuring the
electric dipole moment (EDM) of charged particles.
N. Hempelmann et al. (JEDI Collaboration),
Physical Review Accelerators and Beams 21 (2018) 042002.
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