Performance of the cylindrical drift chamber for the crystal box at LAMPF

Abstract

Abstract A cylindrical drift chamber has been built and tested for use as an electron tracking device in the Crystal Box detector at LAMPF. It has 728 drift cells in eight planes with radii of 105 to 220 mm and with alternating stereo angles of 10° to 16°. Resolutions of σ = 130 μm and track reconstruction efficiencies of 97% were obtained for simple events from cosmic rays and from muon-decay electrons at instantaneous rates of 2 MHz. The resolution and complete event reconstruction efficiency were degraded to 180 μm and 75%, respectively, for events with at least three tracks at muon stopping rates of 8 MHz.