A new polarimeter is being installed in the Brookhaven AGS, based on the successful proton‐carbon polarimeters in RHIC. The polarimeter will measure the left‐right asymmetry for proton—carbon elastic scattering in the Coulomb‐nuclear interference (CNI) region, for vertically polarized protons in the AGS. The polarimeter offers a much higher figure of merit than the existing AGS polarimeter which is based on larger angle proton—proton elastic scattering. We expect to measure the polarization in the AGS with a single or a few acceleration cycles. We also plan to measure the polarization in 2 ms bins during the AGS acceleration ramp. Multiple ramps will be necessary, probably over 30 minutes to an hour. © 2003 American Institute of Physics