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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2015, vol. 115, 9, p. -

New Method for a Continuous Determination of the Spin Tune in Storage Rings and Implications for Precision Experiments

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 U. 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.

© 2015 American Physical Society. 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<inf>s</inf>=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.