Spin-flipping with an rf-dipole and a full Siberian snake

Details Spin-flipping with an rf-dipole and a full Siberian snake Spin-flipping with an rf-dipole and a full Siberian snake

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..570..736l&link_type=abstract

The fourteenth international spin physics symposium, SPIN2000. AIP Conference Proceedings, Volume 570, pp. 736-740 (2001).

Physics

6

Storage Rings, Polarized Beams

Scientific paper

We recently used a vertical-field 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 IUCF Cooler Ring. The spin was flipped 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 maximum spin-flip efficiency of 86.5+/-0.5% in April 2000, and 92.5+/-0.5% in June 2000. The spin-flip efficiency was apparently limited by the maximum achievable current in the rf-dipole. This result indicates that spin-flipping a stored polarized proton beam should be possible in high energy rings such as RHIC (and perhaps HERA in the future), where Siberian snakes are utilized and the dipole rf-flipper-magnets should be quite practical. During the June 2000 run, a new faster technique of locating the rf depolarizing resonance frequency was developed. .

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