  The pp-> pp eta reaction was investigated at excess energies of 15 MeV and 72
MeV using the azimuthally symmetric WASA detector and a polarized proton beam
of the Cooler Synchrotron COSY. The aim of the studies is the determination of
partial wave contributions to the production process of the eta meson in
nucleon-nucleon collisions. Here we present preliminary results of the
extraction of the position of the interaction region with respect to the WASA
detector and preliminary results on the degree of polarization of the COSY
proton beam used in the experiment.
