Vertical Beam Polarization at MAMI
Abstract
For the first time a vertically polarized electron beam has been used for physics experiments at MAMI in the energy range between 180 and 855 MeV. The beam-normal single-spin asymmetry , which is a direct probe of higher-order photon exchange beyond the first Born approximation, has been measured in the reaction . Vertical polarization orientation was necessary to measure this asymmetry with the existing experimental setup. In this paper we describe the procedure to orient the electron polarization vector vertically, and the concept of determining both its magnitude and orientation with the available setup. A sophisticated method has been developed to overcome the lack of a polarimeter setup sensitive to the vertical polarization component.
Cite
@article{arxiv.1612.02863,
title = {Vertical Beam Polarization at MAMI},
author = {B. S. Schlimme and P. Achenbach and K. Aulenbacher and S. Baunack and D. Bender and J. Beričič and D. Bosnar and L. Correa and M. Dehn and M. O. Distler and A. Esser and H. Fonvieille and I. Friščić and B. Gutheil and P. Herrmann and M. Hoek and S. Kegel and Y. Kohl and T. Kolar and H. -J. Kreidel and F. Maas and H. Merkel and M. Mihovilovič and J. Müller and U. Müller and F. Nillius and A. Nuck and J. Pochodzalla and M. Schoth and F. Schulz and C. Sfienti and S. Širca and B. Spruck and S. Štajner and M. Thiel and V. Tioukine and A. Tyukin and A. Weber},
journal= {arXiv preprint arXiv:1612.02863},
year = {2017}
}