Correcting systematic errors in high-sensitivity deuteron polarization measurements

N. P. M. Brantjes, V. Dzordzhadze, R. Gebel, F. Gonnella, F. E. Gray, D. J. van der Hoek, A. Imig, W. L. Kruithof, D. M. Lazarus, A. Lehrach, B. Lorentz, R. Messi, D. Moricciani, W. M. Morse, G. A. Noid, C. J. G. Onderwater, C. S. Ozben, D. Prasuhn, P. Levi Sandri, Y. K. SemertzidisM. da Silva e Silva, E. J. Stephenson*, H. Stockhorst, G. Venanzoni, O. O. Versolato

*Corresponding author for this work

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Abstract

This paper reports deuteron vector and tensor beam polarization measurements taken to investigate the systematic variations due to geometric beam misalignments and high data rates. The experiments used the In-Beam Polarimeter at the KVI-Groningen and the EDDA detector at the Cooler Synchrotron COSY at Julich. By measuring with very high statistical precision, the contributions that are second-order in the systematic errors become apparent. By calibrating the sensitivity of the polarimeter to such errors, it becomes possible to obtain information from the raw count rate values on the size of the errors and to use this information to correct the polarization measurements. During the experiment, it was possible to demonstrate that corrections were satisfactory at the level of 10(-5) for deliberately large errors. This may facilitate the real time observation of vector polarization changes smaller than 10(-6) in a search for an electric dipole moment using a storage ring. (C) 2011 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)49-64
Number of pages16
JournalNuclear instruments & methods in physics research section a-Accelerators spectrometers detectors and associated equipment
Volume664
Issue number1
DOIs
Publication statusPublished - 1-Feb-2012

Keywords

  • Electric dipole moment
  • Polarimeter
  • Deuteron
  • Storage ring
  • ANALYZING POWERS
  • ELASTIC-SCATTERING
  • INTERMEDIATE ENERGIES
  • COSY
  • PERFORMANCE
  • POLARIMETER
  • CARBON

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