Development of the HGCAL Frontend System for the CMS Experiment

At TIFR, we are participating in the development, fabrication, and assembly of intricate stepped and non-stepped hole (NSH) frontend electronics boards, PCB-based baseplates with insulation, and large area Copper-Tungsten (Cu/W, 25:75) composite baseplates, to be used as an absorber in the electromagnetic section of HGCAL. The overall development employs a close interaction with Indian electronics and powder metallurgy industries, translating these efforts into the final product with desired specifications. NSH prototype boards have been recently fabricated, followed by extensive mechanical and electrical quality assurance tests at TIFR and CERN. Similarly, PCB-based baseplates have been fabricated in India and delivered in large numbers to the collaboration as a part of the pre-series production campaign for the prototype HGCAL detector. This talk will cover these R &D efforts carried out at TIFR.