Phase locking the spin precession in a storage ring
Abstract
This letter reports the successful use of feedback from a spin polarization measurement to the revolution frequency of a 0.97 GeV/ bunched and polarized deuteron beam in the Cooler Synchrotron (COSY) storage ring in order to control both the precession rate ( kHz) and the phase of the horizontal polarization component. Real time synchronization with a radio frequency (rf) solenoid made possible the rotation of the polarization out of the horizontal plane, yielding a demonstration of the feedback method to manipulate the polarization. In particular, the rotation rate shows a sinusoidal function of the horizontal polarization phase (relative to the rf solenoid), which was controlled to within a one standard deviation range of rad. The minimum possible adjustment was 3.7 mHz out of a revolution frequency of 753 kHz, which changes the precession rate by 26 mrad/s. Such a capability meets a requirement for the use of storage rings to look for an intrinsic electric dipole moment of charged particles.
Cite
@article{arxiv.1703.07561,
title = {Phase locking the spin precession in a storage ring},
author = {N. Hempelmann and V. Hejny and J. Pretz and E. Stephenson and W. Augustyniak and Z. Bagdasarian and M. Bai and L. Barion and M. Berz and S. Chekmenev and G. Ciullo and S. Dymov and F. -J. Etzkorn and D. Eversmann and M. Gaisser and R. Gebel and K. Grigoryev and D. Grzonka and G. Guidoboni and T. Hanraths and D. Heberling and J. Hetzel and F. Hinder and A. Kacharava and V. Kamerdzhiev and I. Keshelashvili and I. Koop and A. Kulikov and A. Lehrach and P. Lenisa and N. Lomidze and B. Lorentz and P. Maanen and G. Macharashvili and A. Magiera and D. Mchedlishvili and S. Mey and F. Müller and A. Nass and N. N. Nikolaev and A. Pesce and D. Prasuhn and F. Rathmann and M. Rosenthal and A. Saleev and V. Schmidt and Y. Semertzidis and V. Shmakova and A. Silenko and J. Slim and H. Soltner and A. Stahl and R. Stassen and H. Stockhorst and H. Ströher and M. Tabidze and G. Tagliente and R. Talman and P. Thörngren Engblom and F. Trinkel and Yu. Uzikov and Yu. Valdau and E. Valetov and A. Vassiliev and C. Weidemann and A. Wrońska and P. Wüstner and P. Zuprański and M. Żurek},
journal= {arXiv preprint arXiv:1703.07561},
year = {2017}
}