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CDF Burn-in Experience

CDF Burn-in Experience. Hybrid Burn-in 4 days with extensive tests at start/end ~9 out of 8000 chips failed (0.1%) DOIM Burn-in ?????? Ladder Burn-in 4 days with periodic readout tests 126 pinholes in 312064 channels (0.04%) Most occurred early in burn-in (<5 hours) Failure of HV lines

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CDF Burn-in Experience

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  1. CDF Burn-in Experience • Hybrid Burn-in • 4 days with extensive tests at start/end • ~9 out of 8000 chips failed (0.1%) • DOIM Burn-in • ?????? • Ladder Burn-in • 4 days with periodic readout tests • 126 pinholes in 312064 channels (0.04%) • Most occurred early in burn-in (<5 hours) • Failure of HV lines • Leaky paths, sparking between HV, gnd Previous Burn-in Experience

  2. CDF Burn-in Experience • After Instillation • 2 failed DOIM packages out of 556 (0.4%) • ???? Single channel DOIM failures • Assuming same rate of failure are CDF • ~2% SS (~5% DS) rods with at least one chip failure • ~71% SS (~91% DS) rods with at least one pinhole • ~2% SS (~5% DS) rods with at least one optical failure Previous Burn-in Experience

  3. Projection to CMS • Assuming same rate of failure are CDF • ~2% SS (~5% DS) rods with at least one chip failure • ~71% SS (~91% DS) rods with at least one pinhole • ~2% SS (~5% DS) rods with at least one optical failure • CMS should have fewer failures • APV simpler than SVX3D • Optical hybrids more standard than DOIM • Single sided sensors vs. double • Different technologies may yield higher rates of failure Previous Burn-in Experience

  4. Experience at CMS • 1 out of 4 thermal cycled modules at Aachen developed opens (4) between PA-sensor • 1 additional module had >300 opens develop after 1 thermal cycle • All previous experience at CMS with non-”final” technology choices Previous Burn-in Experience

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