Measurement of spin frequency spread in a storage ring

Results of experiments on measurement of spin frequency spread at the VEPP-2M storage ring are presented. Depolarization time at coherent spins flig due to external HF-field effect was measured. The determined value of spin frequency spread in the working variant of the VEPP-2M magnetic structure made up 2πx35 ssup(-1). Comparison of measured values with calculated value for the linear case reveals that contribution of storage ring non-linearities is determinant for spin frequency spread which can be reduced at the expense of correct choice of nonlinearity corrections