Abstract
We recently used a prototype rf dipole magnet to study the spin flipping of a 669 MeV horizontally polarized electron beam stored in the presence of a nearly full Siberian snake in the new MIT-Bates storage 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 flipping to measure a spin-flip efficiency of $94.5\ifmmode\pm\else\textpm\fi{}2.5%$. The spin-flip efficiency was apparently limited by the field strength in the air-core prototype rf dipole magnet. This unexpectedly high efficiency indicates that very efficient spin flipping of the ring's stored polarized electron beam should be possible using the much stronger ferrite spin flipper, which is now being built by the University of Michigan's Spin Physics Center.
Highlights
Polarized beam experiments are a major component of the programs in storage rings such as the Indiana University Cyclotron Facility (IUCF) cooler ring [1], the MIT-Bates storage ring [2], the Brookhaven Relativistic Heavy Ion Collider (RHIC) [3], and HERA at DESY [4]
An rf solenoid was used earlier to spin flip a horizontally polarized proton beam stored in the IUCF cooler ring containing a Siberian snake [5] with 97 6 1% spin-flip efficiency [6,7]
The spin rotation due to a solenoid’s magnetic field integral decreases lineaRrly with energy because of the Lorentz contraction of its B dl; a solenoid is impractical for spin flipping in high energy rings
Summary
Polarized beam experiments are a major component of the programs in storage rings such as the Indiana University Cyclotron Facility (IUCF) cooler ring [1], the MIT-Bates storage ring [2], the Brookhaven Relativistic Heavy Ion Collider (RHIC) [3], and HERA at DESY [4]. An rf solenoid was used earlier to spin flip a horizontally polarized proton beam stored in the IUCF cooler ring containing a Siberian snake [5] with 97 6 1% spin-flip efficiency [6,7]. We recently used a prototype rf dipole to spin flip a 669.2 MeV horizontally polarized electron beam stored in the MIT-Bates storage ring with a nearly full Siberian snake.
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