Abstract
The upgrade of the LHCb experiment is planned for beginning of 2019 unitl the end of 2020. It will transform the experiment to a trigger-less system reading out the full detector at 40 MHz rate. The Vertex Locator (VELO) surrounding the interaction region is used to construct primary and secondary vertices, and the flight distance of long-lived particles. The upgraded VELO will be a hybrid pixel detector read out using the VeloPix ASIC. The vacuum of the detector modules is separated from the beam vacuum by a thin custom made foil. The detector halves are retracted when the beam is injected and closed during stable beams. When closed the first sensitive pixel is 5.1 mm away from the beam. The use of evaporative CO2 coolant in micro-channels decreases the material budget. Micro-channel cooling brings advantages: very efficient heat transfer with almost small temperature gradients across the module, no CTE mismatch with silicon components, and low material contribution. The current status of the VELO will be described together with a presentation of recent test beam results.
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