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Hempelmann, N; Hejny, V; Pretz, J; Stephenson, E; Augustyniak, W; Bagdasarian, Z; Bai, M; Barion, L; Berz, M; Chekmenev, S; Ciullo, G; Dymov, S; Etzkorn, F-J; Eversmann, D; Gaisser, M; Gebel, R; Grigoryev, K; Grzonka, D; Guidoboni, G; Hanraths, T; Heberling, D; Hetzel, J; Hinder, F; Kacharava, A; Kamerdzhiev, V; Keshelashvili, I; Koop, I; Kulikov, A; Lehrach, A; Lenisa, P; Lomidze, N; Lorentz, B; Maanen, P; Macharashvili, G; Magiera, A; Mchedlishvili, D; Mey, S; Müller, F; Nass, A; Nikolaev, N N; Pesce, A; Prasuhn, D; Rathmann, F; Rosenthal, M; Saleev, A; Schmidt, V; Semertzidis, Y; Shmakova, V; Silenko, A; Slim, J; Soltner, H; Stahl, A; Stassen, R; Stockhorst, H; Ströher, H; Tabidze, M; Tagliente, G; Talman, R; Thörngren Engblom, P; Trinkel, F; Uzikov, Yu; Valdau, Yu; Valetov, E; Vassiliev, A; Weidemann, C; Wrońska, A; Wüstner, P; Zuprański, P; Żurek, M
Physical review letters, 07/2017, Letnik: 119, Številka: 1Journal Article
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 (≈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 1 standard deviation range of σ=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.
