R&D on CO2 Cooling using a Silicon Microchannel Substrate for the LHCb VELO Upgrade

The new Vertex Locator (VELO) detector (Figure 1) will replace the silicon micro-strip detector currently operating around the interaction point in the LHCb Experiment. It will use hybrid pixel detectors composed of silicon sensors bump-bonded to new VeloPix CMOS readout chips designed for the new 40MHz readout rate of the LHCb Upgrade