Multi-gap glass resistive plate chambers in HARP

Multi-gap glass resistive plate chambers served as time-of-flight measurement instruments in the large-angle acceptance region of the HARP spectrometer. The system comprised 46 chambers and covered an area of ∼ 8 m2. Mean system efficiencies of 97–98% and an average intrinsic time resolution of 127 ps have been reached, fulfilling the design goal.