AC-LGAD readout and electronics

Friday 18 Sept 2026, 11:00 → 12:40 US/Eastern

 

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

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.

11:00 → 11:15 Updates from Tonko

Speakers: Tonko Ljubicic (Rice Uni), Tonko Ljubicic (Rice University)

AC-LGAD Readout Status TL 18Sep26.pdf

11:15 → 11:30 Updates on testing from IJCLab

Speakers: Dominique MARCHAND (employee@cnrs.fr), Dominique Marchand (IJCLab Orsay)

11:30 → 11:40 Roman pots stave design updates (if any)

Speaker: Jack Fried (BN:)

11:40 → 11:55 Updates on testing from BNL

Speakers: Alexander Jentsch (Brookhaven National Laboratory), Maya Mancini

BNL_eicroc_testing_Sept_18_2026_v0.pptx

EICROC0A_Update_09_17_26.pdf

11:55 → 12:05 AOB

Speaker: Alexander Jentsch (Brookhaven National Laboratory)