99.6% spin-flip efficiency in the presence of a strong Siberian snake

We recently studied the spin-flipping efficiency of an rf-dipole magnet using a 120-MeV horizontally polarized proton beam stored in the Indiana University Cyclotron Facility Cooler Ring, which contained a nearly full Siberian snake. We flipped the spin by ramping the rf dipole's frequency thro...

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Bibliographic Details
Published in:Physical review letters 2002-01, Vol.88 (1), p.014801-014801
Main Authors: Blinov, B B, Etienne, Z B, Krisch, A D, Leonova, M A, Lorenzon, W, Morozov, V S, Peters, C C, Wong, V K, Yonehara, K, Anferov, V A, Schwandt, P, Stephenson, E J, von Przewoski, B, Sato, H
Format: Article
Language:English
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Summary:We recently studied the spin-flipping efficiency of an rf-dipole magnet using a 120-MeV horizontally polarized proton beam stored in the Indiana University Cyclotron Facility Cooler Ring, which contained a nearly full Siberian snake. We flipped the spin by ramping the rf dipole's frequency through an rf-induced depolarizing resonance. By adiabatically turning on the rf dipole, we minimized the beam loss. After optimizing the frequency ramp parameters, we used 100 multiple spin flips to measure a spin-flip efficiency of 99.63+/-0.05%. This result indicates that spin flipping should be possible in very-high-energy polarized storage rings, where Siberian snakes are certainly needed and only dipole rf-flipper magnets are practical.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.88.014801