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Spin Dynamics Investigation of Quasi-Frozen Spin Lattice for EDM Searches

Abstract

The Quasi-Frozen Spin (QFS) method was proposed by Yu. Senichev et al. in [1] as an alternative to the Frozen Spin (FS) method for the search of deuteron electric dipole moment (dEDM). The QFS approach simplifies the design of the lattice. In particular, small changes to the currently operating COSY storage ring will satisfy the QFS condition. Spin decoherence and systematic errors fundamentally limit EDM signal detection and measurement. Our QFS implementation method includes measurement of spin precession in (1) the horizontal plane to calibrate the magnetic field when changing field polarity and (2) the vertical plane to search for EDM. To address systematic errors due to element misalignments, we track particle bunches in forward and reverse directions. We have modeled and tracked two QFS and one FS lattice in COSY INFINITY. The models include normally distributed random variate spin kicks in magnetic dipoles and in combined E and B field elements. We have used Wolfram Mathematica programs to partially automate lattice input file generation and tracking data analysis. We have observed additional indications that the QFS method is a viable alternative to the FS method.

E. Valetov, Y. Senichev, M. Berz, on behalf of the JEDI Collaboration, in: Proceedings of Spin'16, University of Illinois at Urbana-Champaign, in print

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