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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: 73
Entry time: Sat Feb 8 20:48:11 2020
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| Author: |
Dinko Ferencek |
| Category: |
Full test |
| Subject: |
FT for 4 modules: 1550, 1551, 1552, 1553 |
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1550: B/B/B (-20/-20/+10). Electrical grade is B due to mean noise >200e for some ROCs. IV: 0.45 uA at +10 C, slope 1.09
1551: C/C/C (-20/-20/+10). Mean noise >200e for some ROCs, dead trimbits in ROC 13, but trimmed Vcal threshold distribution and distribution of trim bits look OK. IV: 0.33 uA at +10 C, slope 1.09
==> Manually regraded to B
1552: B/B/B (-20/-20/+10). Electrical grade is B due to mean noise >200e for some ROCs. IV: 0.23 uA at +10 C, slope 1.10
1553: B/B/B (-20/-20/+10). Electrical grade is B due to mean noise >200e for some ROCs, double-column readout problem in ROC 11 (see attached plot). IV: 0.41 uA at +10 C, slope 1.70
Chiller operational procedures:
Chiller temperature set and kept at 3.5 C throughout the entire test. This was done after observing that during tests at +10 C and with the chiller left at +3.5 C, the Peltiers were mostly inactive and there was no excessive heating occurring. This seems to suggest that the coolant temperature at +3.5 C is a good balance against the ambient temperature and heat produced by working modules to keep the temperature at +10 C. The temperature history plot is attached. |
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