New method for a continuous determination of the spin tune in storage rings and implications for precision experiments

D. Eversmann, V. Hejny, F. Hinder, A. Kacharava, J. Pretz, F. Rathmann, M. Rosenthal, F. Trinkel, S. Andrianov, W. Augustyniak, Z. Bagdasarian, M. Bai, W. Bernreuther, S. Bertelli, M. Berz, J. Bsaisou, S. Chekmenev, D. Chiladze, G. Ciullo, M. ContalbrigoJ. de Vries, S. Dymov, R. Engels, F. M. Esser, O. Felden, M. Gaisser, R. Gebel, H. Glueckler, F. Goldenbaum, K. Grigoryev, D. Grzonka, G. Guidoboni, C. Hanhart, D. Heberling, N. Hempelmann, J. Hetzel, R. Hipple, D. Hoelscher, A. Ivanov, V. Kamerdzhiev, B. Kamys, I. Keshelashvili, A. Khoukaz, I. Koop, H-J. Krause, S. Krewald, A. Kulikov, A. Lehrach, P. Lenisa, B. Lorentz, P. Maanen, G. Macharashvili, A. Magiera, R. Maier, K. Makino, B. Marianski, D. Mchedlishvili, Ulf-G. Meiner, S. Mey, A. Nass, G. Natour, N. Nikolaev, A. Nogga, K. Nowakowski, A. Pesce, D. Prasuhn, J. Ritman, Z. Rudy, A. Saleev, Y. Semertzidis, Y. Senichev, V. Shmakova, A. Silenko, J. Slim, H. Soltner, A. Stahl, R. Stassen, M. Statera, E. Stephenson, H. Stockhorst, H. Straatmann, H. Stroeher, R. Talman, P. Thoerngren Engblom, A. Trzcinski, Yu. Uzikov, Yu. Valdau, E. Valetov, A. Vassiliev, C. Weidemann, C. Wilkin, A. Wirzba, A. Wronska, P. Wuestner, M. Zakrzewska, P. Zupranski, D. Zyuzin

Research output

49 Citations (Scopus)


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 νs = γ • G (γ is the Lorentz factor, G the magnetic anomaly). For 970MeV/c deuterons coherently recessing with 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.
Original languageEnglish
Number of pages6
JournalPhysical Review Letters
Issue number9
Publication statusPublished - 2015

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