- First interation
- General Scheme
- Skimmed periodic trigger events are used as background overlay on top of simulated data.
- These are stored in digi format, in bins of McIlwain-L. Input files are selected by bin, events then selected "randomly".
- Overlay is done by merging digis for CAL and TKR with a placeholder for ACD as well.
- Status - tagged and is ready to be incorporated into a GR tag on a branch.
- Plan - run as part of the system tests.
- Exercise the code to look for any general issues.
- Directly compare before and after.
- The problem - how to get the correct calibration constants for the input background digis.
- Only *one* event time can be active at a time in Gaudi.
- Periodic triggers can be taken at different times corresponding to different calibrations, and the simulation can be done with calibrations corresponding to yet other times.
- The scheme only works correctly for MC generation where "ideal" calibration constants are used, which is clearly not useful for generating "real data."
- Upgrade in progress
- Get the correct calibration constants to the background digi data
- Rewrite the background files with their calibrations applied, leaving them in a form that doesn't need "calibration".
- Save information in a new set of overlay data classes.
- For CAL and ACD, merge the info a the MC stage, before digis are created.
- In the CAL, trigger info needs to be generated before digitization
- The production of background overlay files will now be a two step process:
- Skim jobs to pull out periodic triggers from the data
- Conversions jobs which run at least part of the reconstruction on these files, convert to these new TDS classes and output them to new background overlay files.
- Tasks
- New TDS classes ???
- Modify the overlay code to access the new classes. ??
- New code to merge the results of ACD and CAL simulation with the overlay info ?
- Create PDS (Root) equivalents (new package overlayRootData)
- Convert periodic-trigger Digi files to the new format
- Incorporate into system tests
- ETA: November 26.
{"serverDuration": 42, "requestCorrelationId": "46671c4e665fcfad"}