Speaker
Description
The High Luminosity upgrade of the CERN Large Hadron Collider aims to achieve unprecedented levels of instantaneous and integrated luminosities. 140 to 200 collisions per bunch crossing are anticipated, which will represent a severe challenge for the detectors. The endcap part of the Compact Muon Solenoid calorimeters will be replaced by a new detector. In the barrel, the lead tungstate crystals and avalanche photodiodes (APDs) of the Electromagnetic Calorimeter (ECAL) will be preserved, while the readout and trigger electronics will undergo a complete replacement. Two ASICs were designed for the readout of the APDs. The first, CATIA, is a gain trans-impedance amplifier with two outputs with different gains. The second, LiteDTU, includes two 160 MHz ADCs, one for each CATIA output, the logic to select the gain to read out, compress, format, and serialize the data. The noise increase in the photodetectors, due to radiation-induced dark current, will be mitigated by reducing the ECAL operating temperature from 18°C to 9°C. The trigger primitive formation will be moved off-detector and handled by powerful and flexible FPGA processors. The upgrade of the ECAL electronics will allow maintaining the excellent energy resolution of the current detector and, in addition, greatly enhance the time resolution of electrons and photons. This presentation will review the final design of the full ECAL barrel readout chain together with the status of the individual component R&D.