Speaker
Description
Compensation of depolarizing partial snake resonances using betatron coupling has been demonstrated at the Brookhaven AGS. At the nominal acceleration rate, the depolarization of the proton beam from any one of the 82 resonances is too small to optimize the compensation each individual resonance empirically. The compensation therefore requires accurate modeling of the accelerator lattice and accounting of both known sources of such resonance (the helical dipole and applied skew quadrupole fields) and unknown sources (e.g. sextupole feed-down effects). At low energies in the AGS these efforts are complicated by the large optical effects of the helical dipoles and the near-integer vertical tune requires to avoid strong vertical spin resonances. Individual resonances can be investigated by crossing the resonance more slowly, in this case at fixed energies with a slow tune ramp. We report here on progress in both the modeling and experimental investigations into these depolarizing mechanisms.
Funding Agency
Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
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