BEAM TEST of the ATLAS SILICON DETECTOR MODULES with BINARY READOUT in the CERN H8 BEAM in 19961

detector with small angle stereo readout. Readout will be AC-coupled from n-type implant strips in n-bulk crystals. increased depletion voltage [3], the junctions will be at the nstrips allowing the possibility of operation under partial depletion of the silicon. The readout electronics [4] employs a 1 bit binary scheme whereby only hits above a single threshold are recorded. In such a scheme the required resolution is achieved with 75pm pitch detectors. Noise OccuPancY must be well below not to exceed the bandwidth of the data transmission system. A key Derformance reauirement of such a system is to maintain are reprted from a beam test Of Prototype After radiation induced type inversion of the bulk and micro strip detectors and front-end electronics designed for use at the LHC. The detector assemblies were 12 cm long and were read out with binary electronics. Both irradiated and unirradiated assemblies were measured in a 1.56T magnetic field for efficiency, noise occupancy, and resolution as a function of bias voltage, binary hit threshold, and detector rotation angle with respect to the beam direction. Measurements were also performed at a particle flux comparable to the one expected at the LHC.