A polarimeter for absolute proton beam polarization measurement at 200MeV with accuracy better than ±0.5% has been developed as a part of the RHIC polarized source upgrade. The polarimeter is based on elastic proton-carbon (pC) scattering at 16.2° where the analyzing power is close to 100% and is known with high accuracy. The elastically and in-elastically scattered protons are clearly identified by the difference in their propagation through a variable-thickness copper absorber and their

more »

... deposition in the detectors. The 16.2° elastic scattering polarimeter was used for the calibration of a high-rate inclusive 12° polarimeter, on-line polarization tuning and monitoring. This technique can be used for polarization measurements in the energy range 160÷250 MeV.