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DOM Electronic Reliability Progress Report

DOM Electronic Reliability Progress Report. S.Colonges 09/04/2014. Progress Report. Board analyzed:. Octopus small Board. PCA9548  higher FIT  Temperature elevation TBC Failure risk (15 years)  F(t) = 1 – e - l t  6,4% Connectors: Screw lock small connectors

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DOM Electronic Reliability Progress Report

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  1. DOM Electronic Reliability Progress Report S.Colonges 09/04/2014

  2. Progress Report Board analyzed:

  3. Octopus small Board PCA9548  higher FIT  Temperature elevation TBC Failure risk (15 years)  F(t) = 1 – e-lt 6,4% Connectors: • Screw lock small connectors • Mechanical connector reliability • Mechanical weakness point on Molex edge

  4. Octopus large Board • PCA9548  higher FIT  Temperature elevation TBC Failure risk (15 years)  F(t) = 1 – e-lt 6,4% Connectors: • Screw lock small connectors • Mechanical connector reliability • Mechanical weakness point on Molex edge

  5. Base Failure risk (15 years)  F(t) = 1 – e-lt 26% -Capacitors  change rating (case) for higher contributors ? (case 1206 /100 nF higher contributor) -Degraded modes  number of PMT fails allowed / DOM? - ASIC ESS  TBC

  6. Power Board Failure risk (15 years)  F(t) = 1 – e-lt 75,7% -Derating  A lot of capacitors overrated!  Change design  new derating analysis -CEM analysis? (inductors shielding?) -Mechanical weakness for DC/DC converters modules

  7. CLB V2 Failure risk (15 years)  F(t) = 1 – e-lt 26,9% -Derating  capacitors (22µF, 100µF and 4,7µF) • Change design?  new derating analysis • Connectors  mechanical weakness point

  8. Global results • Failure probability (15 years) for the whole DOM  88,4% with PBV2 • 52,7% without PBV2

  9. Results update • Accelerating parameters:  Process, application, ruggedizing • Derating analysis update • FMECA  degraded modes? (failure effects) / FDIR • Reports

  10. Open questions • Stress screening / ESS • Connectors  integration procedure / vibrating qualification? Fixing? • Prototypes tests reports

  11. More slides…

  12. Base

  13. Octopus small Board

  14. Octopus large Board

  15. CLB V2 Board

  16. CLB V2 Board

  17. CLB V2 Board

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