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In general, there are more digis and less 0's for all the subsystems. This evolves a bit with the later GR versions. Energy features are shifted a bit higher in some distributions. There are more triggers and more vetoes. These are not surprises. Examples below.
Noisy Strips
comparison of two overlay versions |
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no overlay version |
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There are very noticeable outliers in the TkrDigiLayer and TkrDigiTower plots. I'm not sure what should be special in the overlays for Layers 7 and 17 or Towers 0 and 8? Calibration mismatch? The overlays are derived from data, but the system tests use ideal calibrations. (Nope. From Leon: the overlay events are type 0, where the specific calibration info is removed.) Seems like a big difference for that. Something else funny with the systests? Note that the system tests pass all events, and there is no filtering or trigger criteria applied to the digi distributions.
You may have already guessed... these are hot tracker strips in the PT (periodic trigger) events. The selected periodic trigger events must be taken from before some of the hot strip mask updates were made. See this presentation on Tracker Status at the September 2008 collaboration meeting. The two layers outside specification at that time were Tower 0 X7 (32 strips) and Tower 8 X17.
comparison of two overlay versions |
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comparison with no overlay |
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This level of noise, although very noticeable in the digi plots, does not have much effect on the track reconstruction.
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Selected plots from the initial comparison of GR v17r7 with and without overlays turned on.
Note that the system tests pass all events, and there is no filtering or trigger criteria applied to the digi distributions.
v17r7 overlay vs no overlay | v17r15 vs no overlay |
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The overall level of digis is reduced for all of these the later GR versions compared to v17r7. I think most some of this for the ACD should be because of the updates to exclude sub-threshold ACD tiles for PT events.
The layer and tower outliers are there throughout, but are expected - explained above.
. The ACD hit status bits were added to ACDOverlay in v17r10.
A change in v17r13 is the handling of merging overlays into empty events, pure overlays. This should reduce the general level of digis.
Additional Overlay tests?
A secondary item is if the AllGammaOverlay test is sufficient at the system test level. Do we want additional tests for specific energies or maybe magnetic latitudes?
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The system tests do not pick up calibrations from the database and . They default to ideal calibrations, i.e. calibration flavor = "ideal".
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