Abstract
The design, construction, and performance of a streamer-chamber system for the study of inelastic proton-proton collisions at the CERN ISR are described. The chambers have specially shaped ground electrodes to accomodate the ISR vacuum chamber and to obtain an almost 4π solid angle. Problems arising from the non-flat electrodes and the insertion of converter plates into the sensitive volume of the chambers are discussed. The high-voltage and gas system are described and in particular the control system for the streamer-chamber memory time which is essential for operation at high ISR luminosities. The optical system, including single-stage electrostatic image intensifiers, is explained. The chambers are tiggered on inelastic beam-beam interactions with counter hodoscopes, or on interactions including a photon which is detected in a lead-glass Cherenkov counter located at 90°. Finally the analysis of the pictures is described.
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