Speaker
Description
The ITk strip detector is part of the ATLAS inner tracker upgrade for the High Luminosity (HL) -LHC era. Its production is a globally coordinated effort currently underway. 13 sites in the UK, US, and China are involved in building and testing 11k barrel modules, while 20 sites in Canada, Europe, and Australia are producing 7k end-cap modules with different designs.
The modules consist of large 300 um thick planar silicon sensors of ~100 cm^2 in size. Several flexible circuit boards housing the custom powering and readout electronics are glued directly onto the sensor and wirebonded to the capacitively coupled sensor strips. All modules have to fulfill tight assembly and performance specifications. Their conformity and consistency is checked by Quality Control (QC) tests at every step of the production process and results are collected in a global database. As part of the electrical QC the finished modules undergo thermal cycling between +20 C to -35 C in dedicated test stands exposing them to stresses comparable to their operation environment. At each cycle their performance is closely monitored and analyzed.
The testing methodology for the final modules will be presented including a number of setup and detector specific challenges encountered during production testing and lessons learned. An overview will be shown of QC results and variations from building and testing of the first ~2000 production grade barrel detector modules.