  The Preshower (PSh) detector is a component of the DIRAC setup. It is
designed to improve rejection efficiency of e-e+ pairs background in the
{\pi}{\pi} and K{\pi} pair measurement. To increase the overall efficiency, a
new two-layer structure scintillator Preshower detector has been realized in
the region where the Nitrogen Cherenkov detector has been shortened to
introduce new detectors. The new Preshower-Cherenkov combination ensures the
electron rejection efficiency better than 99.9% in momentum region 1-7 GeV/c.
