A 1 m(2) CsI RICH prototype has been successfully tested in a hadron beam a
t CERN SPS. The prototype, fully equipped with 15k electronic channels, has
been used to identify particles coming from pi-Be interactions. Track reco
nstruction has been performed by using a telescope consisting of four gas p
ad chambers. A detailed description of the detector will be presented and r
esults from test will be discussed.