Spin flipping with an rf dipole and a full Siberian snake

B B Blinov,B Von Przewoski,D W Sivers,V S Morozov,A D Krisch,V A Anferov,V K Wong,Ya S Derbenev,P Schwandt,D Yu Kantsyrev,T Kageya

doi:10.1103/physrevstab.3.104001

B B Blinov, B Von Przewoski + Show 9 more

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https://doi.org/10.1103/physrevstab.3.104001

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Abstract

We recently used an rf dipole magnet to study the spin flipping of a 120 MeV horizontally polarized proton beam stored in the presence of a nearly full Siberian snake in the Indiana University Cyclotron Facility Cooler Ring. We flipped the spin by ramping the rf dipole's frequency through an rf-induced depolarizing resonance. After optimizing the frequency ramp parameters, we used multiple spin flips to measure a spin-flip efficiency of $86.5\ifmmode\pm\else\textpm\fi{}0.5%$. The spin-flip efficiency was apparently limited by the field strength in the rf dipole. This result indicates that spin flipping a stored polarized proton beam should be possible in high energy rings such as the Brookhaven Relativistic Heavy Ion Collider and HERA where Siberian snakes are certainly needed and only dipole rf-flipper magnets are practical.

Highlights

We recently used an rf dipole magnet to study the spin flipping of a 120 MeV horizontally polarized proton beam stored in the presence of a nearly full Siberian snake in the Indiana University Cyclotron Facility Cooler Ring
At 120 MeV, the circulation frequency in the Cooler Ring was fc ෇ 1.597 84 MHz
At different dipole frequencies, the radial polarization, which is about 89% of the total horizontal polarization at the position of our polarimeter at 120 MeV

Summary

Introduction

We recently used an rf dipole magnet to study the spin flipping of a 120 MeV horizontally polarized proton beam stored in the presence of a nearly full Siberian snake in the Indiana University Cyclotron Facility Cooler Ring. Resonance, which can be used to flip the spin direction of the ring’s stored polarized protons [6,7].

Results

Conclusion