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Wire chambers are routinely operated as tracking detectors in magneticspectrometers at high-intensity continuous electron beams. Especially inexperiments studying reactions with small cross-sections the reaction yield islimited by the background rate in the chambers. One way to determine the trackof a charged particle through a multi-wire proportional chamber (MWPC) is themeasurement of the charge distribution induced on its cathodes. In practicalapplications of this read-out method, the algorithm to relate the measuredcharge distribution to the avalanche position is an important factor for theachievable position resolution and for the track reconstruction efficiency. Analgorithm was developed for operating two large-sized MWPCs in a strongbackground environment with multiple-particle tracks. Resulting efficiencieswere determined as a function of the electron beam current and on the signalamplitudes. Because of the different energy-losses of pions, kaons, and protonsin the momentum range of the spectrometer the efficiencies depend also on theparticle species.

Particle tracking in kaon electroproduction with cathode-charge sampling in multi-wire proportional chambers