Abstract
We recently studied spin flipping of a $1.94\text{ }\text{ }\mathrm{GeV}/c$ vertically polarized proton beam at COSY in J\"ulich, Germany. We swept an rf-dipole's frequency through an rf-induced spin resonance to flip the beam's polarization direction. After determining the resonance's frequency, we varied the dipole's strength, frequency range, and frequency ramp time. At the rf-dipole's maximum strength, and optimum frequency range and ramp time, we measured a spin-flip efficiency of $99.3%\ifmmode\pm\else\textpm\fi{}0.1%$. This result indicates that an rf dipole may allow efficient spin flipping in high energy proton rings.
Highlights
During the past decade, polarized beam experiments have become an important part of the programs in storage rings such as the IUCF Cooler Ring [1], AmPS at NIKHEF [2], the MIT-Bates Storage Ring [3], COSY [4], low energy polarimeter (LEP) at CERN [5], RHIC at BNL [6], and HERA at DESY [7,8]
The spin-flipping efficiency with an rf dipole should be essentially independent of energRy due to the Lorentz invariance of a dipole magnet’s Bdl; this is quite important for very high energy polarized proton rings
The apparatus used for this experiment, including the COSY storage ring [22 –25], the EDDA detector [26], the low energy polarimeter, the injector cyclotron, and the polarized ion source [27,28,29] is indicated in Fig. 1, along with the rf dipole
Summary
During the past decade, polarized beam experiments have become an important part of the programs in storage rings such as the IUCF Cooler Ring [1], AmPS at NIKHEF [2], the MIT-Bates Storage Ring [3], COSY [4], LEP at CERN [5], RHIC at BNL [6], and HERA at DESY [7,8]. We recently used an rf dipole to study the spin flipping of 1:941 GeV=c polarized protons stored in the COSY ring.
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