A stereo, cylindrical drift chamber for muon decay experiments at LAMPF

Abstract A stereo, cylindrical drift chamber has been built for use in a search for rare decay modes of the muon at LAMPF. This chamber (part of the Crystal Box detector) has 728 cells on eight concentric annuli at alternating angles of 10° from the chamber axis and with radii from 105 to 220 mm. The basic cell cross section is (9 × 10) mm 2 and the inter-layer spacing is 4.7 mm. Preliminary results show the single wire efficiencies to be greater than 99%. Based on results obtained from prototype chambers, we hope to achieve 170 ≃m resolution (including multiple scattering) when TDC offsets and sense wire locations found in a careful inspection of the endplates are added to the track finding algorithm.