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CMS Pixel Detector
Miscellaneous
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Phase 1
Phase 2
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Layer 1 Replacement
Layers 2-4
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| Layer 1 Replacement Elog |
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Message ID: 212
Entry time: Tue Apr 14 17:29:46 2020
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| Author: |
Andrey Starodumov |
| Category: |
General |
| Subject: |
ROC4 or ROC12 defects |
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Starting from M1650 almost every module has a cluster of dead pixels or broken bump bonds on
ROC4 or (more often) ROC12. The number of defects varied from 20 to 40.
It's almost excluded that such damage is made at PSI, since both of us: Silvan and me, first time connected the cable
to the module.
It would be interesting to check whether these bare modules arrived all together. |