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Updated: Apr 3, 2026

Magnetic Tweezers for the Measurement of Twist and Torque
Published on: May 19, 2014
New Method for a Continuous Determination of the Spin Tune in Storage Rings and Implications for Precision
D Eversmann1, V Hejny2, F Hinder1,2
1III. Physikalisches Institut B, RWTH Aachen University, 52056 Aachen, Germany.
Abstract:
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.
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