Fine Pitch and Low Material Readout Bus for the Silicon Pixel Detector in the PHENIX Vertex Tracker

The Silicon Pixel Detector will be installed in summer 2009 as part of the RHIC-PHENIX Silicon Vertex Tracker (VTX) upgrade at the Brookhaven National Laboratory. The VTX consists of a silicon pixel detector and stripixel detector. For the construction of the silicon pixel detector, we have developed a fine pitch and low material readout bus as the backbone parts of the VTX. In this article, we report the development of the readout bus.