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DOM Electronic Reliability Progress Report

This progress report analyzes the reliability of electronic components on Octopus small and large boards, highlighting failure risks, mechanical weaknesses, and derating strategies. Key focus areas include connectors, capacitor ratings, and failure probabilities over 15 years.

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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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