Strip Detectors

Last year GaAs microstrip detectors with parallel strip patterned Schottky contacts were tested at CERN [2,8,9]. Different strip pitch and metal contact width-to-pitch ratios were used to investigate the effects of charge sharing and possible signal loss between strips. These detectors met LHC performance specifications with respect to signal to noise, resolution, and speed [10].

The first wedge-shaped ATLAS prototype detectors from EEV and Alenia were tested at CERN in the H8 test beam this year. These have 65mm long Schottky fan-shaped strips with the pitch varying from 50$\mu$m at the narrow end to 76$\mu$m. The detectors have integrated bias structures and silicon nitride decoupling capacitors. The detectors were read out by either analogue (Felix [11]) or binary [12] electronics. One detector irradiated to a fluence of 7.7 10¹³ 24GeV/c p/cm² was tested at room temperature with Felix readout. Two parallel strip detectors with integrated resistors and decoupling capacitors fabricated upon Tomsk substrates, one of which irradiated to a fluence of 3 10¹³ p/cm², were also tested with Felix readout. Analysis of these data has just begun.