Physical Review Research (Jun 2025)

Proof-of-principle demonstration of a pilot bunch comagnetometer in a stored beam

  • J. Slim,
  • F. Rathmann,
  • A. Andres,
  • V. Hejny,
  • A. Nass,
  • A. Kacharava,
  • P. Lenisa,
  • N. N. Nikolaev,
  • J. Pretz,
  • A. Saleev,
  • V. Shmakova,
  • H. Soltner,
  • F. Abusaif,
  • A. Aggarwal,
  • A. Aksentev,
  • B. Alberdi,
  • L. Barion,
  • I. Bekman,
  • M. Beyß,
  • C. Böhme,
  • B. Breitkreutz,
  • N. Canale,
  • G. Ciullo,
  • S. Dymov,
  • N.-O. Fröhlich,
  • R. Gebel,
  • M. Gaisser,
  • K. Grigoryev,
  • D. Grzonka,
  • J. Hetzel,
  • O. Javakhishvili,
  • V. Kamerdzhiev,
  • S. Karanth,
  • I. Keshelashvili,
  • A. Kononov,
  • K. Laihem,
  • A. Lehrach,
  • N. Lomidze,
  • B. Lorentz,
  • G. Macharashvili,
  • A. Magiera,
  • D. Mchedlishvili,
  • A. Melnikov,
  • F. Müller,
  • A. Pesce,
  • V. Poncza,
  • D. Prasuhn,
  • D. Shergelashvili,
  • N. Shurkhno,
  • S. Siddique,
  • A. Silenko,
  • R. Stassen,
  • E. J. Stephenson,
  • H. Ströher,
  • M. Tabidze,
  • G. Tagliente,
  • Y. Valdau,
  • M. Vitz,
  • T. Wagner,
  • A. Wirzba,
  • A. Wrońska,
  • P. Wüstner,
  • M. Żurek

DOI
https://doi.org/10.1103/physrevresearch.7.023257
Journal volume & issue
Vol. 7, no. 2
p. 023257

Abstract

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In polarization experiments at storage rings, one of the challenges is to maintain the spin-resonance condition of a radio-frequency spin rotator with the spin precessions of the orbiting particles. Time-dependent variations of the magnetic fields of ring elements lead to unwanted variations of the spin-precession frequency. We report here on a solution to this problem by shielding (or masking) one of the bunches stored in the ring from the high-frequency fields of the spin rotator, so that the masked pilot bunch acts as a comagnetometer for the other signal bunch, tracking fluctuations in the ring on a time scale of about one second. While the new method was developed primarily for searches of electric dipole moments of charged particles, it may have far-reaching implications for future spin physics facilities, such as the EIC and NICA.