Polarimetry at RHIC: RHIC polarized beam in Run 2011
Abstract
In 2011 Run polarized proton beam collisions of a total energy Sqrt S=500 GeV and peak luminosity up to 1.6*10^32 cm-2 sec-1 was delivered to experiments for intermediate boson W production studies with the longitudinally polarized beams. The average beam polarization of a 48% was measured with the H-jet polarimeter. Apparently, there are no polarization losses during acceleration to 100 GeV energy, where a 55-60% polarization was measured in Run 2009. Polarization losses at further acceleration to 250 GeV are caused by the presence depolarizing resonances. As a result, significant polarization profiles of the beams are also generated. Polarization profiles were measured by the p-Carbon CNI polarimeters in the scanning mode of operation. Polarized beam luminosity is weighted by the polarization profiles and “effective” polarization, as seen in collisions was about 53% in Run 2011.
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