Quality Control of the Tileboards for the High Granularity Calorimeter upgrade of the CMSexperiment

The CMS experiment will be upgrading its detectors in lieu of higher luminosities and collision rates during the High-Luminosity era of the LHC (HL-LHC). One key upgrade of the CMS detector will be its end-cap calorimeters, which will be fitted with the new High Granularity Calorimeter (HGCAL). Since the HL-LHC will have 10 times more luminosity, the HGCAL will have improved radiation hardness and better background rejection that is caused due to much higher pile-up. It will consist of both the Electromagnetic and Hadronic calorimeters. Furthermore, the Hadronic calorimeter is split into two different technologies owing to the amount of radiation damage. The SiPM-on-Tile technology consists of small scintillator tiles that are linked to SiPMs (Silicon Photo-multiplier) on the PCB. The PCB without any scintillators on it is known as a tileboard. A tileboard will house 1 or 2 readout ASICs (called HGCROCs), and each HGCROC can read out 72 channels. The production tileboards have already started to be made. To test and certify the boards and the functionality of the HGCROCs, a robust quality control procedure is needed. The QC procedure, as well as some of the results, will be discussed in this presentation.