Spin tune mapping as a novel tool to probe the spin dynamics in storage rings

Abstract

Precision experiments, such as the search for electric dipole moments of charged particles using storage rings, demand for an understanding of the spin dynamics with unprecedented accuracy. The ultimate aim is to measure the electric dipole moments with a sensitivity up to 15 orders in magnitude better than the magnetic dipole moment of the stored particles. This formidable task requires an understanding of the background to the signal of the electric dipole from rotations of the spins in the spurious magnetic fields of a storage ring. One of the observables, especially sensitive to the imperfection magnetic fields in the ring is the angular orientation of stable spin axis. Up to now, the stable spin axis has never been determined experimentally, and in addition, the JEDI collaboration for the first time succeeded to quantify the background signals that stem from false rotations of the magnetic dipole moments in the horizontal and longitudinal imperfection magnetic fields of the storage ring. To this end, we developed a new method based on the spin tune response of a machine to artificially applied longitudinal magnetic fields. This novel technique, called \textit{spin tune mapping}, emerges as a very powerful tool to probe the spin dynamics in storage rings. The technique was experimentally tested in 2014 at the cooler synchrotron COSY, and for the first time, the angular orientation of the stable spin axis at two different locations in the ring has been determined to an unprecedented accuracy of better than $2.8\mu$rad.

arXiv comment32 pages, 15 figures, 7 tables

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Cited by in corpus (14)

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• General relativity effects in precision spin experimental tests of fundamental symmetries
• Spin dynamics investigations for the EDM experiment at COSY
• New approach to search for parity-even and parity-odd time-reversal violation beyond the Standard Model in a storage ring
• First detection of collective oscillations of a stored deuteron beam with an amplitude close to the quantum limit
• General description of spin motion in storage rings in presence of oscillating horizontal fields
• Phase Measurement for Driven Spin Oscillations in a Storage Ring
• A new computational framework for particle and spin simulations based on the stochastic Galerkin method
• First Experimental Limit on the Permanent Electric Dipole Moment of the Deuteron
• Analytical Estimations of the Chromaticity and Corrections to the Spin Precession Frequency in Weak Focusing Magnetic Storage Rings
• Non-exponential decoherence of radio-frequency resonance rotation of spin in storage rings
• Corrections for a constant radial magnetic field in the g-2 and electric-dipole-moment experiments with muons in storage rings
• New method of probing an oscillating EDM induced by axionlike dark matter using an RF Wien Filter in storage rings
• Fresh Look at Polarized Deuterons at the Nuclotron/NICA \& HIAF and Beyond