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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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 Tue Sep 10 15:18:20 2019, Matej Roguljic, Other, Modules 1504, 1505, 1520 irradiation report
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 Fri Sep 13 15:06:51 2019, Andrey Starodumov, Other, Modules 1504, 1505, 1520 irradiation report
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Thu Sep 19 00:52:24 2019, Dinko Ferencek, Other, Modules 1504, 1505, 1520 irradiation report 
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Message ID: 8
Entry time: Tue Sep 10 15:18:20 2019
Reply to this: 10
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| Author: |
Matej Roguljic |
| Category: |
Other |
| Subject: |
Modules 1504, 1505, 1520 irradiation report |
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| Modules 1504, 1505 and 1520 were taken to Zagreb for irradiation on 13.08.19. The goal was to check the v4 behavior after irradiation. They were irradiated to 1.2 MGy and returned to PSI on 9th of September. Upon testing them at PSI, they all had issues. ROCs on M1504 and M1520 were not programmable at all, changing Vana had no effect. Vana could be set on M1505 while targeting Iana = 28 mA/ROC, however, no timing could be found for it and no working pixel could be found. Andrey and Matej took the modules under the microscope and saw a "greenish" deposits on HDI metal pads of unknown origin. There was also a bit of liquid near the HDI ID on M1520, but not on others. The residue could be shorting some pads causing issues on the module. It is still unclear whether the residue comes from the HDI, cap or is it introduced during irradiation by something in Zagreb. |