Only the best please! - Quality control on silicon sensors for the CMS experiment

The tracking detectors of the CMS experiment at the LHC (CERN, Geneva, Switzerland) will be replaced by an improved version in a few years' time. The Japanese manufacturer Hamamatsu Photonics K.K. has been producing silicon strip sensors for this purpose since 2020. The quality of the sensors supplied is checked at six institutes involved in CMS. This includes the detailed electrical measurement of individual sensors with their 2032 channels. One of the participating institutes is the KIT Institute of Experimental Particle Physics (ETP). A total of 5031 sensors in 129 deliveries were checked at the ETP. This corresponds to about a quarter of the total production, and ETP thus completes its contribution to the quality control of the sensors. The sensors are now ready for the next step, module production, in which up to 2000 modules consisting of sensors, readout electronics and cooling structures will be assembled at ETP.