A proportional chamber recoil detector for the elastic polarization experiment WA6 at the SPS

Abstract A set of proportional wire chambers is used in an elastic scattering experiment to measure direction and momentum of recoil particles using the magnetic field of a polarized target assembly. This recoil spectrometer has been operated satisfactorily at high rates and it has been implemented in a fast decision system to improve the trigger selection. Construction criteria and performances of this detector are discussed.