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SUMMARY:The CMS ECAL upgrade for precision timing measurements at the High
 -Luminosity LHC
DTSTART;VALUE=DATE-TIME:20230907T142000Z
DTEND;VALUE=DATE-TIME:20230907T144000Z
DTSTAMP;VALUE=DATE-TIME:20260520T171311Z
UID:indico-contribution-3218@indico.tlabs.ac.za
DESCRIPTION:Speakers: Riccardo  Paramatti (CERN)\nThe High Luminosity upgr
 ade of the LHC (HL-LHC) at CERN will provide unprecedented instantaneous a
 nd integrated luminosities of around 5 x 10^34 cm-2 s-1 and 3000/fb\, resp
 ectively. An average of 140 to 200 collisions per bunch-crossing (pileup) 
 is expected. In the barrel region of the Compact Muon Solenoid (CMS) elect
 romagnetic calorimeter (ECAL)\, the lead tungstate crystals and avalanche 
 photodiodes (APDs) will continue to perform well\, while the entire readou
 t and trigger electronics will be replaced.\n\nA dual gain trans-impedance
  amplifier and an ASIC providing two 160 MHz ADC channels\, gain selection
 \, and data compression will be installed. The noise increase in the APDs\
 , due to radiation-induced dark current\, will be mitigated by reducing th
 e ECAL operating temperature. The trigger primitive formation will be move
 d off-detector and performed by powerful and flexible FPGA processors.\n\n
 The upgraded ECAL will greatly improve on the time resolution for photons 
 and electrons with energies above 10 GeV. Together with the introduction o
 f a new timing detector designed to perform measurements with a resolution
  of a few tens of picoseconds for minimum ionizing particles\, the CMS det
 ector will be able to precisely reconstruct the primary interaction vertex
  even with 140-200 pileup interactions per event.\n\nThe design of the ful
 l ECAL barrel readout chain and the status of the individual component R&D
  will be presented and results from recent test beam campaigns at the CERN
  SPS\, using electron beams with energies of up to 250 GeV\, will be summa
 rised. In particular\, we will present measurements of the energy and timi
 ng resolution performance of the latest HL-LHC ECAL readout electronics pr
 ototypes.\n\nhttps://indico.tlabs.ac.za/event/112/contributions/3218/
LOCATION: Meeting Room 2.44 - 2.46
URL:https://indico.tlabs.ac.za/event/112/contributions/3218/
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