Speaker
Description
The CMS Collaboration is preparing to upgrade its current endcap calorimeters for the HL-LHC era by implementing a high-granularity calorimeter (HGCAL). This new design will feature unprecedented transverse and longitudinal segmentation in both the electromagnetic and hadronic compartments, enabling 5D information (space, time, energy) readout. Silicon sensors are utilized for the electromagnetic section and high-irradiation regions within the hadronic section, while plastic scintillator tiles with on-tile silicon photomultipliers (SiPMs) are used in the low-irradiation regions of the hadronic section. The full HGCAL will consist of approximately 6 million silicon sensor channels organized across 30,000 detector modules. Each module is read out by a front-end board, known as the hexaboard, which incorporates dedicated readout chips called HGCROCs.
To ensure proper assembly, each of the 78 channels of the HGCROCs must be correctly soldered onto the hexaboard. To facilitate quality control, a custom charge injection board was designed. This board can inject a desired amount of charge capacitively into each channel via the wire-bonding pads on the hexaboard. In this presentation, we will discuss the results from testing the charge injection board, which was developed as a quality control measure for assembled hexaboards in the HGCAL project.
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