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Thermal Cycling Tests of Dummy Modules Setup Pre-cycling resistance measurements IZM module results Alenia module underway Setup Modules built with CERN Flex V.2 and bare dummy module. Used Ecobond glue under MCC, pigtail bonding field, and 4 corners.

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thermal cycling tests of dummy modules
Thermal Cycling Tests of Dummy Modules
  • Setup
  • Pre-cycling resistance measurements
  • IZM module results
  • Alenia module underway
setup
Setup
  • Modules built with CERN Flex V.2 and bare dummy module.
  • Used Ecobond glue under MCC, pigtail bonding field, and 4 corners.
  • Modules used for FE wirebonding tests prior to thermal cycling
  • First cycled modules unconstrained, then attached to sector using CGL and UV-cure tacks on 4 corners.
  • Cycled 21oC to –35oC in environmental chamber.
  • Monitored module temperature and chain resistance in real time
setup cont
Setup (cont.)

Only 4 columns monitored in real time during cycling

W

W

All columns measured on probe station before and after

izm module results
IZM Module results
  • No change after 2 cycles of unconstrained module
  • No change DURING 19 cycles of module on sector
  • Open columns detected AFTER overnight storage at 21oC

On bad chip, all columns were open prior to tests & chip fell off after removing module from sector. Solder bumps left ½ on chip ½ on sensor.

RED = location of open column

32/270 columns failed

possible explanation
Possible Explanation

UV Tack

UV Tack

  • Results are consistent with differential movement of dummy chips and dummy sensor.
  • For example, assume sensor doesn’t move under cooldown(probably not correct, just example), then contraction of each chip is about (2.5x10-6) x(either 3.7 or 5.5x103 microns)x56=0.5-0.8 microns.
  • Worst case is corners of chip, but we only measure columns.
  • Approximate strain is (0.5-0.8)/(20) or 2.5-3.8%.. Solder stress vs strain becomes non-linear for strains above about 1%.
  • Creep rupture is possible explanation for failure after sitting.

Carbon-carbon on sector

CGL

alenia module tests underway
Alenia Module Tests Underway
  • 3 Cycles to –35o unconstrained
  • 3 Cycles to –35o mounted on sector
  • Time at –35o 30-40 minutes/cycle
  • Let sit for a day
  • No failures yet
  • Tests continuing