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CMS Pixel Detector
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Layer 1 Replacement
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| Layer 1 Replacement Elog |
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Message ID: 48
Entry time: Tue Jan 21 12:19:08 2020
In reply to: 47
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| Author: |
Dinko Ferencek |
| Category: |
Cold box tests |
| Subject: |
Latest tests of PH optimization |
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| Dinko Ferencek wrote: | We did some tests by running the latest version of pXar on modules M1521, M1529, M1534 and M1536, specifically trimming and PH optimization. Of the 4 modules tested, the PH optimization converged only for M1521. We plan to further investigate with Urs' help possible reasons for failed PH optimization.
We also noticed a change in the threshold distribution plot of the latest trim bit test compared to the previous version of the test (see attached plots). |
The problem was traced down to a wrong value of the vcallow parameter in the PH optimization configuration. The value was 10 instead of 50 expected by the test. It turned out that the optimization converged for M1521 because this is a PROC600V3 module for which the configuration files were regenerated for another reason and vcallow was consequently set to the right value of 50. The other 3 modules are PROC600V4 modules and for them old configuration files with a wrong vcallow value were used. |