These calibration boards are used to inject current signals of known amplitude to equalize the response of 200,000 calorimeter channels. The desired linearity must be better than 1 per mill and the maximum non-uniformity must be 2 per mill, and this up to doses that can go up to 200 krad. This induces a necessary precision work to eliminate all sources of noise and non-linearity.
This project is carried out in collaboration with the OMEGA group, in charge of the design of the calibration chips and the IJCLab group, responsible for the design of the board. The ATLAS LAPP group is responsible for the tests on the chips and on the calibration cards. It is also responsible for the production, with 150 boards to begin production in fall 2025. A fourth prototype of the chip is being manufactured and will be tested in the fall of 2022. A first prototype card containing 128 channels (32 pairs of DAC-pulser chips) is being designed and will be tested at the beginning of 2023.
Contact : Narei Lorenzo Martinez (lorenzo@lapp.in2p3.fr)