AC-LGAD readout and electronics

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Description

 

https://bnl.zoomgov.com/j/1658386942?pwd=jfdBW1OFxwIy2RZtW5c7jcQLg87afY.1

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Meeting topics:

*Updates from Tonko in EICROC1 testing, et al.
*Updates on Roman pot stave design (if any)
*Updates on lab testing from BNL
*Updates on lab testing from IJCLab
*AOB
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Update from Tonko

  • New firmware compatible with both EICROC1 and EICROC0A ready by Monday/Tuesday.
  • Adjustments to power board for compatibility with BTOF.

 

Update from Chiara and Dominique

  • Work on both EICROC0 and EICROC0A --> slides next week.
    • Characterization of EICROC0 + sensor with the laser, similar work with EICROC0A + sensor w/ TCT.
  • Issues seen with EICROC0A, concerns about performance even separate from the metal fix issue.
    • Discussions with Christophe et al. on-going.

 

Update from Jack

  • Schematic is all but finalized, new updates in 1-2 weeks.

 

Update from Alex

  • Test setups all working, progress on EICROC0A and EICROC1 testing.
  • HPK flip-chip pulled apart, no obvious evidence of misaligned bumps -- seems to be oxidation on the pads which inhibited good contact of LGAD with bumps.
  • Large AC-LGAD mounted onto FNAL/UCSC board, but sensor is damaged (extremely high current)
    • G. Giacomini probed the sensor afterwards to confirm it was the sensor, and not the board.
    • Will probe another sensor and try again.
  • Mapped charge vs. DACu (pulser amplitude) on EICROC0A -- range is roughly double what it was for EICROC0 (~ 0.5 fC to ~ 64 fC of charge).

 

Update from Maya

  • Showed first ADC and TDC results with charge injection after various bug fixes.
  • Jitter levels out around 10-20ps for the various pixels and ADC appears linear, up until about 30 DACu (~ 31 fC) where the slope changes slightly.
    • This is after Vref subtraction of 64 DACu (roughly -64mV), so we are not seeing saturation - ADC doesn't seem fully linear as the charge gets very high.
  • Initial S-curves look pretty good - tested with 20fC, 15.5fC, and 6fC if injected charge.
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