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SUMMARY:Chips for calibration of the ATLAS LAr calorimeter
DTSTART;VALUE=DATE-TIME:20230905T150000Z
DTEND;VALUE=DATE-TIME:20230905T152000Z
DTSTAMP;VALUE=DATE-TIME:20260719T123001Z
UID:indico-contribution-3189@indico.tlabs.ac.za
DESCRIPTION:Speakers: Gisele Martin-Chassard   (IN2P3)\nThe LHC upgrade at
  CERN implies an increase in the dynamic range for the electromagnetic liq
 uid argon (Lar) calorimeter of the ATLAS detector\, a change in the power 
 supply system and an increase of the luminosity and thus of radiation effe
 cts on detectors. This requires completely redoing the Lar calibration sys
 tem. The new system should provide a 16-bit range current (from 625 nA to 
 320 mA) with 1‰ accuracy while being radiation tolerant. The former oper
 ating principle is used: a very precise DC current is stored in an inducto
 r when this current is switched off it generates a precise pulse injected 
 in the readout electronics. This is achieved by two different chips: the f
 irst one\, in TSMC 130nm technology\, provides the 16-bit current DAC as w
 ell as the calibration management system (I2C slow control and commands to
  obtain pulses)\; the second chip\, in XFAB 180nm technology\, embeds four
  high-frequency switches (1GHz) to generate the fast pulses for calibratio
 n. This talk will present these two chips in details and give measurement 
 results as well as irradiation test results for both technologies.\n\nhttp
 s://indico.tlabs.ac.za/event/112/contributions/3189/
LOCATION: Meeting Room 2.44 - 2.46
URL:https://indico.tlabs.ac.za/event/112/contributions/3189/
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