/ physics.acc-ph arXiv:1703.07561

Phase locking the spin precession in a storage ring

Hempelmann, N. (Julich, Forschungszentrum) ; Hejny, V. (Julich, Forschungszentrum) ; Pretz, J. (JCHP, Julich) ; Stephenson, E. (Indiana U.) ; Augustyniak, W. (NCBJ, Swierk) ; Bagdasarian, Z. (Julich, Forschungszentrum) ; Bai, M. (JCHP, Julich) ; Barion, L. (INFN, Ferrara) ; Berz, M. (Michigan State U.) ; Chekmenev, S. (Aachen, Tech. Hochsch.) ; Ciullo, G. (INFN, Ferrara) ; Dymov, S. (Dubna, JINR) ; Etzkorn, F.-J. (Julich, Forschungszentrum) ; Eversmann, D. (Aachen, Tech. Hochsch.) ; Gaisser, M. (IBS, Daejeon) ; Gebel, R. (Julich, Forschungszentrum) ; Grigoryev, K. (Aachen, Tech. Hochsch.) ; Grzonka, D. (Julich, Forschungszentrum) ; Guidoboni, G. (INFN, Ferrara) ; Hanraths, T. (Julich, Forschungszentrum) ; Heberling, D. (JCHP, Julich) ; Hetzel, J. (Julich, Forschungszentrum) ; Hinder, F. (Julich, Forschungszentrum) ; Kacharava, A. (Julich, Forschungszentrum) ; Kamerdzhiev, V. (Julich, Forschungszentrum) ; Keshelashvili, I. (Julich, Forschungszentrum) ; Koop, I. (Novosibirsk, IYF) ; Kulikov, A. (Dubna, JINR) ; Lehrach, A. (JCHP, Julich) ; Lenisa, P. (INFN, Ferrara) ; Lomidze, N. (Tbilisi State U.) ; Lorentz, B. (Julich, Forschungszentrum) ; Maanen, P. (Aachen, Tech. Hochsch.) ; Macharashvili, G. (Dubna, JINR) ; Magiera, A. (Jagiellonian U.) ; Mchedlishvili, D. (Julich, Forschungszentrum) ; Mey, S. (Julich, Forschungszentrum) ; Müller, F. (Julich, Forschungszentrum) ; Nass, A. (Julich, Forschungszentrum) ; Nikolaev, N.N. (Moscow, MIPT) ; Pesce, A. (INFN, Ferrara) ; Prasuhn, D. (Julich, Forschungszentrum) ; Rathmann, F. (Julich, Forschungszentrum) ; Rosenthal, M. (Julich, Forschungszentrum) ; Saleev, A. (Samara U.) ; Schmidt, V. (Julich, Forschungszentrum) ; Semertzidis, Y. (KAIST, Taejon) ; Shmakova, V. (Dubna, JINR) ; Silenko, A. (Dubna, JINR) ; Slim, J. (Aachen, Tech. Hochsch.) ; Soltner, H. (Julich, Forschungszentrum) ; Stahl, A. (JCHP, Julich) ; Stassen, R. (Julich, Forschungszentrum) ; Stockhorst, H. (Julich, Forschungszentrum) ; Ströher, H. (JCHP, Julich) ; Tabidze, M. (Tbilisi State U.) ; Tagliente, G. (INFN, Bari) ; Talman, R. (Cornell U.) ; Thörngren Engblom, P. (Royal Inst. Tech., Stockholm) ; Trinkel, F. (Julich, Forschungszentrum) ; Uzikov, Yu. (Dubna, JINR) ; Valdau, Yu. (St. Petersburg, INP) ; Valetov, E. (Michigan State U.) ; Vassiliev, A. (St. Petersburg, INP) ; Weidemann, C. (INFN, Ferrara) ; Wrońska, A. (Jagiellonian U.) ; Wüstner, P. (Julich, Forschungszentrum) ; Zuprański, P. (NCBJ, Swierk) ; $\dot{\mathrm Z}$urek, M. (Julich, Forschungszentrum)

Abstract: This letter reports the successful use of feedback from a spin polarization measurement to the revolution frequency of a 0.97 GeV/$c$ bunched and polarized deuteron beam in the Cooler Synchrotron (COSY) storage ring in order to control both the precession rate ($\approx 121$ 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 $\sigma = 0.21$ 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.

Web-Page: http://inspirehep.net/record/1518812/files/feedback_control.png; http://inspirehep.net/record/1518812/files/feedback.png; http://inspirehep.net/record/1518812/files/spinFlipPrinciple_Amp0-001.png; http://inspirehep.net/record/1518812/files/globalSineAmp0-001.png; http://inspirehep.net/record/1518812/files/angle6637.png; http://inspirehep.net/record/1518812/files/arXiv:1703.07561.pdf

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