PoS - Proceedings of Science
Volume 324 - XVII International Workshop on Polarized Sources, Targets & Polarimetry (PSTP2017) - Proton polarimetery
Absolute polarization measurement of the 200 MeV proton beam at BNL Linac.
A. Poblaguev*, G. Atoian and A. Zelenski
Full text: pdf
Pre-published on: May 31, 2018
Published on: June 14, 2018
Abstract
For absolute calibration of the vertically polarized \unit{200}{\MeV} proton beam at BNL Linac, we detect in left/right symmetric scintillator detectors the elastic protons from the beam scattering on the Carbon target. The detectors are located at angles $\theta_\text{Lab}=\pm16.2^\circ$, at which analyzing power of the elastic scattering has local maximum of 99.35\%. Variable length copper absorbers of $\sim$\unit{40}{\mm} thickness are installed in both arms of the polarimeter to suppress the inelastic protons. During RHIC Run 2017 we upgraded the polarimeter DAQ with a \unit{250}{\MHz}12 bit WFD. The detailed analysis of all detected events allowed us to properly isolate scattered proton signals and to control in-situ the efficiency of inelastic proton suppression. The systematic error in absolute polarization measurement was confirmed to be $\sigma_P^\text{syst}/P\sim0.5\%$.
DOI: https://doi.org/10.22323/1.324.0024
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.