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Eversmann, D; Hejny, V; Hinder, F; Kacharava, A; Pretz, J; Rathmann, F; Rosenthal, M; Trinkel, F; Andrianov, S; Augustyniak, W; Bagdasarian, Z; Bai, M; Bernreuther, W; Bertelli, S; Berz, M; Bsaisou, J; Chekmenev, S; Chiladze, D; Ciullo, G; Contalbrigo, M; de Vries, J; Dymov, S; Engels, R; Esser, F M; Felden, O; Gaisser, M; Gebel, R; Glückler, H; Goldenbaum, F; Grigoryev, K; Grzonka, D; Guidoboni, G; Hanhart, C; Heberling, D; Hempelmann, N; Hetzel, J; Hipple, R; Hölscher, D; Ivanov, A; Kamerdzhiev, V; Kamys, B; Keshelashvili, I; Khoukaz, A; Koop, I; Krause, H-J; Krewald, S; Kulikov, A; Lehrach, A; Lenisa, P; Lomidze, N; Lorentz, B; Maanen, P; Macharashvili, G; Magiera, A; Maier, R; Makino, K; Mariański, B; Mchedlishvili, D; Meißner, Ulf-G; Mey, S; Nass, A; Natour, G; Nikolaev, N; Nioradze, M; Nogga, A; Nowakowski, K; Pesce, A; Prasuhn, D; Ritman, J; Rudy, Z; Saleev, A; Semertzidis, Y; Senichev, Y; Shmakova, V; Silenko, A; Slim, J; Soltner, H; Stahl, A; Stassen, R; Statera, M; Stephenson, E; Stockhorst, H; Straatmann, H; Ströher, H; Tabidze, M; Talman, R; Thörngren Engblom, P; Trzciński, A; Uzikov, Yu; Valdau, Yu; Valetov, E; Vassiliev, A; Weidemann, C; Wilkin, C; Wirzba, A; Wrońska, A; Wüstner, P; Zakrzewska, M; Zuprański, P; Zyuzin, D
Physical review letters, 2015-Aug-28, Letnik: 115, Številka: 9Journal Article
A new method to determine the spin tune is described and tested. In an ideal planar magnetic ring, the spin tune-defined as the number of spin precessions per turn-is given by ν(s)=γG (γ is the Lorentz factor, G the gyromagnetic anomaly). At 970 MeV/c, the deuteron spins coherently precess at a frequency of ≈120 kHz in the Cooler Synchrotron COSY. The spin tune is deduced from the up-down asymmetry of deuteron-carbon scattering. In a time interval of 2.6 s, the spin tune was determined with a precision of the order 10^{-8}, and to 1×10^{-10} for a continuous 100 s accelerator cycle. This renders the presented method a new precision tool for accelerator physics; controlling the spin motion of particles to high precision is mandatory, in particular, for the measurement of electric dipole moments of charged particles in a storage ring.
