Mapping a Dual-Axis Duo-Lateral Position Sensitive Silicon Detector*

A Dual Axis Duo Lateral (DADL) position sensitive silicon detector, used in the Forward Array Using Silicon Technology (FAUST), was developed to record data on position and energy as high energy charged particles pass through. In the process, the particle encounters multiple materials that contribute to energy loss, including the varying thickness of the silicon and aluminum dead layers within the DADL. Mapping these two materials across the face of the DADL results in improved energy and position resolution. This process involved comparing energy loss data at different dead layer thicknesses and resultant particle energy throughout the face of the detector. Identifying these variables required us to be able to maximize our resolution to the manufacturer’s specification for the silicon detector. Furthermore, we have constructed, tested, and analyzed different biasing configurations for the DADL to see if an improvement to energy and position resolution could be made to the current configuration used in the FAUST array. The primary motivation for the improved resolution in this work is to enhance the mapping of the dead layer thicknesses. Current findings demonstrate a requirement for a 1.5 keV or less energy resolution to map these materials to a dead layer thickness variation of 100 Angstrom across the face of the silicon.