Pixel-level Sampling CMOS Vertex Detector for the ILC

Precision vertex reconstruction at the ILC requires a detector capable of exquisite spatial resolution while withstanding significant low momentum charged particle fluxes and modest radiation damage. Lessons can be learned from the development of an ultra-thin CMOS pixel detector device for the high-occupancy environment of a Super B-Factory. The Continuous Acquisition Pixel (CAP) detector is based upon a Monolithic Active Pixel Sensor (MAPS) architecture fabricated in a commercially available CMOS process. What distinguishes the CAP is pipelining within each pixel cell that allows for great robustness against large hit rates, while maintaining excellent spatial resolution. These characteristics, in addition to options to expand the pixel-level signal processing, make it an ideal technology for a future International Linear Collider (ILC) vertex detector. We propose to evolve the CAP architecture and verify the suitability of this MAPS technology for the ILC through a sequence of two prototype devices.