Spin Coupling Resonance and Suppression in the AGS

Spin depolarizing resonances due to coupling may account for as much as a 30 percent loss in polarization in the AGS. The major source of coupling in the AGS is the solenoidal snake. In the past some preliminary work was done to understand this phenomena [1], and a method to overcome these resonances was attempted [2]. However, in the polarized proton run of 2002, the response of these coupled spin resonances to the strength of the solenoidal snake, skew quadrupoles and vertical and horizontal betatron tune separation was studied to provided a benchmark for a modified DEPOL program [3]. Then using the new DEPOL program, a method method to cure the coupled spin resonances in the AGS via spin matching rather than global or local decoupling was explored.