Phase Measurement for Driven Spin Oscillations in a Storage Ring

Abstract

This 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 $0.97\text{GeV/c}$ 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.

References in corpus (5)

• New method for a continuous determination of the spin tune in storage rings and implications for precision experiments
• Measuring the Polarization of a Rapidly Precessing Deuteron Beam
• Phase locking the spin precession in a storage ring
• Electromagnetic Simulation and Design of a Novel Waveguide RF Wien Filter for Electric Dipole Moment Measurements of Protons and Deuterons
• Spin tune mapping as a novel tool to probe the spin dynamics in storage rings

Cited by in corpus (2)

• General relativity effects in precision spin experimental tests of fundamental symmetries
• Spin dynamics investigations for the EDM experiment at COSY