Title

Correcting systematic errors in high-sensitivity deuteron polarization measurements

Authors

N. P.M. Brantjes, University of Groningen, KVI - Center for Advanced Radiation Technolog (KVI-CART)
V. Dzordzhadze, Brookhaven National Laboratory
R. Gebel, Forschungszentrum Jülich (FZJ)
F. Gonnella, Università degli Studi di Roma "Tor Vergata"
F. E. Gray, Regis University
D. J. Van Der Hoek, University of Groningen, KVI - Center for Advanced Radiation Technolog (KVI-CART)
A. Imig, Brookhaven National Laboratory
W. L. Kruithof, University of Groningen, KVI - Center for Advanced Radiation Technolog (KVI-CART)
D. M. Lazarus, Brookhaven National Laboratory
A. Lehrach, Forschungszentrum Jülich (FZJ)
B. Lorentz, Forschungszentrum Jülich (FZJ)
R. Messi, Università degli Studi di Roma "Tor Vergata"
D. Moricciani, Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tor Vergata
W. M. Morse, Brookhaven National Laboratory
G. A. Noid, The Indiana University Cyclotron Facility
C. J.G. Onderwater, University of Groningen, KVI - Center for Advanced Radiation Technolog (KVI-CART)
C. S. Özben, İstanbul Teknik Üniversitesi
D. Prasuhn, Forschungszentrum Jülich (FZJ)
P. Levi Sandri, INFN, Laboratori Nazionali Di Frascati
Y. K. Semertzidis, Brookhaven National Laboratory
M. Da Silva E Silva, University of Groningen, KVI - Center for Advanced Radiation Technolog (KVI-CART)
E. J. Stephenson, The Indiana University Cyclotron Facility
H. Stockhorst, Forschungszentrum Jülich (FZJ)
G. Venanzoni, INFN, Laboratori Nazionali Di Frascati
O. O. Versolato, University of Groningen, KVI - Center for Advanced Radiation Technolog (KVI-CART)

Document Type

Article

Publication Date

2-1-2012

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 Jülich. 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. © 2011 Elsevier B.V. All rights reserved.

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