Development of the Pixel OR SOI detector for high energy physics experiments

A Silicon-On-Insulator (SOI) Technology is suitable for vertex detectors for high energy physics experiments since complex functions can be fabricated on the SOI wafer with a small amount of material thanks to the monolithic structure. We developed a new sensor processing scheme "PIXOR(PIXel OR) for pixel detectors using a LAPIS 0.20 mu m SOI process. An analog signal from each pixelated sensor is divided into two dimensional directions, and 2n signal channels from a small n by n pixel matrix are ORed as n column and n row channels, then the signals are processed by a readout circuit in each small matrix. This PIXOR scheme reduces the number of readout channels and avoids a deterioration of intrinsic position resolution due to large circuit area, that was a common issue for monolithic detectors. This feature allows high resolution, low occupancy and on-sensor signal processing at the same time. We present the successful results of the PIXOR readout scheme using a first prototype. (C) 2013 Elsevier B.V. All rights reserved.