VELO module characterisation : Results from the Glasgow LHCb VELO module burn-in

The LHCb VErtex LOcator (VELO) modules were constructed at Liverpool University and assembled into the VELO detector halves at CERN. Between these two stages each module was rigorously inspected, tested and thermally cycled in the Glasgow module burn-in setup. The results of the extensive tests are summarised in this note for each one of the tested VELO modules. Major results presented in this note are the full characterisation of the leakage currents, bad channels, signal to noise measurements and metrology correlations. There were multiple small problems that were identified through visual inspections of the modules and the feed back into the production process proved critical. As a result of the electrical and thermal tests one module was withheld from production and reserved as a spare module. In addition further studies are reported which were based on individual modules such as characterisation of the timing of the front end pulse shapes.