Phase 1 pixel modules production and High Density Interconnect testing

During the first run of the LHC, luminosity peaked at $1 \times 10^{34} cm^{-2}s^{-1}$ with $ \approx 50 ns$ bunch spacing a pile-up of about 25, or simultaneous inelastic collisions per crossing, occur in the CMS experiment. However after the upgrade of of the LHC during long shut down 1, luminosity, and therefore pile-up. Therefore the CMS pixel tracker has to be upgraded to be able to operate correctly under this news stronger constraints. That is how this CERN Summer Student project, which took place at the CERN Meyrin site, comes within the framework of the pixel detector upgrade in the CMS experiment with a work aimed on the phase 1 of pixel modules production and tests of the HDI. The production and tests of the HDI were held in cleanroom facilities. This included first hand as well as to work on pixel modules building and performing size and flatness tests on them, and on a other hand testing several HDIs. At first, prototypes modules were assembled before real modules building. Another aspect of work was to test the flatness of 24 German handles used to hold the pixel module on top of them. These tests were held outside the cleanroom, with a cold box setup. In the end one real module was built and tested during this project.