Charge collection efficiency in double-sided silicon microstrip detectors

We present measurements of charge collection efficiency in double-sided silicon microstrip sensors using the signal from a pulsed laser. We compare the efficiency as a function of voltage and position for various strip geometries. The sensors studied here were manufactured as prototypes for the SVXII detector, an upgrade of the CDF silicon vertex detector for run II of the Fermilab Tevatron. Large inefficiencies were observed in prototypes with certain n-side strip geometries.