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SSD SEU Candidates Investigation

SSD SEU Candidates Investigation. All Candidates 2010 - 2013. Measured and Integrated Dose. RAMSES Sensors , but dose given in Sv and not in Rad

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SSD SEU Candidates Investigation

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  1. SSD SEU CandidatesInvestigation

  2. AllCandidates 2010 - 2013

  3. Measured and Integrated Dose • RAMSES Sensors, but dose given in Sv and not in Rad • No sensorsexatlynearourracks (seenext slide map). The twonearest (on A side) are one on the miniframe (PMIL2513) and one at the edgeof the ALICE Cavern (PMIL2511). Ourracks are in between. Notsureifthere are sensors on I side • Twovaluesofmeasured and integrated dose, one per sensor

  4. Measured Dose 2010-2013 (Sv/h) – PMIL2513

  5. Measured Dose 2010-2013 (Sv/h) – PMIL2511

  6. Measured Dose 2010-2013 (Sv/h) – PMIL2513(Zoom)

  7. Measured Dose 2010-2013 (Sv/h) – PMIL2511(Zoom)

  8. Integrated Dose 2010-2013 (Sv) – PMIL2513

  9. Integrated Dose 2010-2013 (Sv) – PMIL2511

  10. DDL 513 – Event 1

  11. DDL 513 – Event 2

  12. DDL 513 – Event 3

  13. DDL 514 – Event 1

  14. DDL 514 – Event 2

  15. DDL 514 – Event 3

  16. DDL 516 – Event 1

  17. DDL 519 – Event 1

  18. DDL 521 – Event 1 The Log entry waswritten at 2.52 am (12/07/2010), butaccordingto the logbook the problemsstarted at leastaround 1 am.

  19. DDL 523 – Event 1

  20. Dose absorbedwhen the SEU happened(PMIL2513 – PM2511) • DDL 521: 0.0076 Sv – 0.00055 Sv (this DDL is on I side butthisvalueismeasured on the A side. Notsureifthereis a RAMSES on I side) • DDL 514: • 1 event: 0.474 Sv – 0.0079 Sv (Probablysolved just with a powercycle) • 2 event: 0.606 Sv – 0.0082 Sv (ie 0.132 Sv – 0.0003 Sv wrtevent 1) • 3 event: 1.998 Sv – 0.0115 Sv (ie 1.396 Sv – 0.0033 Sv wrtevent 2) • DDL 513: • 1 event: 1.357 Sv – 0.0108 Sv • 2 event: 2.356 Sv – 0.0117 Sv (ie 1.000 Sv – 0.0009 Sv wrtevent 1) • 3 event: 3.004 Sv – 0.0124 Sv (ie 0.648 Sv – 0.0007 Sv wrtevent 2) • DDL 516: 2,797 Sv – 0.0123 Sv • DDL 519: 2.855 Sv – 0.0123 Sv • DDL 523: 2.982 Sv – 0.0124 Sv (this DDL is on I side butthisvalueismeasured on the A side. Notsureifthereis a RAMSES on I side)

  21. Total InstantaneousLuminosity

  22. Total InstantaneousLuminosity (Zoom)

  23. Total IntegratedLuminosity

  24. Integrated Dose / IntegratedLuminosity

  25. Conclusions • Some casesclearlyassociatedto a peak in the radiationmeasuredappeared just before the event: • DDL 513 event 1, DDL 514 events 2 and 3 • Almostall the othershappenedduring STABLE BEAMS but no evidentpeak in the measured dose wrtimmediatelybefore or after. • Whichactionhastobetaken?

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