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@ARTICLE{Hejny:1043475,
      author       = {Hejny, V. and Andres, A. and Pretz, J. and Abusaif, F. and
                      Aggarwal, A. and Aksentev, A. and Alberdi, B. and Barion, L.
                      and Bekman, I. and Beyß, M. and Böhme, C. and Breitkreutz,
                      B. and Canale, N. and Ciullo, G. and Dymov, S. and
                      Fröhlich, N.-O. and Gebel, R. and Gaisser, M. and
                      Grigoryev, K. and Grzonka, D. and Hetzel, J. and
                      Javakhishvili, O. and Kacharava, A. and Kamerdzhiev, V. and
                      Karanth, S. and Keshelashvili, I. and Kononov, A. and
                      Laihem, K. and Lehrach, A. and Lenisa, P. and Lomidze, N.
                      and Lorentz, B. and Macharashvili, G. and Magiera, A. and
                      Mchedlishvili, D. and Melnikov, A. and Müller, F. and Nass,
                      A. and Nikolaev, N. N. and Okropiridze, D. and Pesce, A. and
                      Piccoli, A. and Poncza, V. and Prasuhn, D. and Rathmann, F.
                      and Saleev, A. and Shergelashvili, D. and Shmakova, V. and
                      Shankar, R. and Shurkhno, N. and Siddique, S. and Silenko,
                      A. and Slim, J. and Soltner, H. and Stassen, R. and
                      Stephenson, E. J. and Stroeher, Hans and Tabidze, M. and
                      Tagliente, G. and Valdau, Y. and Vitz, M. and Wagner, T. and
                      Wirzba, A. and Wrońska, A. and Wüstner, P. and Żurek, M.},
      title        = {{M}aintaining a resonance condition of an rf spin rotator
                      through a feedback loop in a storage ring},
      journal      = {Physical review accelerators and beams},
      volume       = {28},
      number       = {6},
      issn         = {2469-9888},
      address      = {College Park, MD},
      publisher    = {American Physical Society},
      reportid     = {FZJ-2025-02878},
      pages        = {062801},
      year         = {2025},
      abstract     = {This paper presents the successful application of a
                      phase-lock feedback system to maintain the resonance
                      condition of a radio frequency (rf) spin rotator
                      (specifically, an rf Wien filter) with respect to a 120 kHz
                      spin precession in the Cooler Synchrotron (COSY) storage
                      ring. Real-time monitoring of the spin precession and the rf
                      Wien filter signal allows the relative phase between the two
                      to be stabilized at an arbitrary setpoint. The feedback
                      system compensates for deviations in the relative phase by
                      adjusting the frequency and/or phase of the rf device as
                      needed. With this method, a variation in the phase relative
                      to the demanded value with a standard deviation of
                      𝜎Δ⁢𝜑≈0.2  rad could be achieved. The system
                      was implemented in two runs aiming at a first direct
                      measurement of the deuteron electric dipole moment in 2018
                      and 2021. In addition, the difference between a single-bunch
                      beam affected by the spin rotator and a two-bunch system in
                      which only one bunch is exposed to the spin rotator fields
                      is discussed. Both methods have been used during these beam
                      times. The ability to keep the spin precession and the rf
                      fields synchronized is crucial for future investigations of
                      electric dipole moments of charged particles using storage
                      rings.},
      cin          = {IKP-2 / IKP-1 / IKP-4 / IKP-TA / IAS-4 / ZEA-2 / ZAT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IKP-2-20111104 / I:(DE-Juel1)IKP-1-20111104 /
                      I:(DE-Juel1)IKP-4-20111104 / I:(DE-Juel1)IKP-TA-20111104 /
                      I:(DE-Juel1)IAS-4-20090406 / I:(DE-Juel1)ZEA-2-20090406 /
                      I:(DE-Juel1)ZAT-20090406},
      pnm          = {613 - Matter and Radiation from the Universe (POF4-613) /
                      621 - Accelerator Research and Development (POF4-621) /
                      srEDM - Search for electric dipole moments using storage
                      rings (694340)},
      pid          = {G:(DE-HGF)POF4-613 / G:(DE-HGF)POF4-621 /
                      G:(EU-Grant)694340},
      experiment   = {EXP:(DE-Juel1)JEDI-20170712},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001518851400001},
      doi          = {10.1103/PhysRevAccelBeams.28.062801},
      url          = {https://juser.fz-juelich.de/record/1043475},
}