Speaker
Description
This spring, the LHCb collaboration installed a new vertex detector, the so-called upgraded VErtex LOcator (VELO). The Velo consists of 52 modules with hybrid silicon pixel detectors. The sensors are kept cold using bi-phase CO2 as a cooling medium. The CO2 flows through micro-channels embedded in a silicon substrate on which pixel sensors and the hybrids are glued. The first active detector elements are located within 5 mm from the interaction point inside a secondary vacuum. Cooling temperature, vacuum level, radiation hardness and radiation length define strict requirements for the design and materials used. The choice of the adhesives is therefore of utmost importance. They must be thermally conductive and retain tackiness after several thermal cycles.
In this presentation the module design and construction will be described. The glue selection and jig design with emphasis on geometrical precision and handling will be discussed in detail.
