Object of the Exercise:
Upgrade simulations to use as-measured noise and pileup. These can be obtained from periodic triggers, so instead of generating noise from whole cloth we would read in periodic triggers and overlay them on top of the simulated events.
The first step of the above is to employ the following strategy:
- Generate/simulate a Monte Carlo event and run the "standard" digitization stage for each subsystem
- Run an algorithm which will determine the appropriate bin from which to select a random event and then read that in
- input format is standard digi's
- input digi's will go into a "special" section of the TDS to be managed separately
- After this, a series of subsystem specific digi "merge" algorithms run to merge the input overlay digis into the the simulated digis
- If overlay hit is unique, simply add it into the collection
- If overlay hit is shared then attempt to "add" it on top of the simulated hit (subsystem dependent!)
- Mark the overlay hits so they can be identified during reconstruction/analysis, if desired.
- Run a special step which attempts to adjust the trigger information (in particular gem bits)
- OnboardFilter/Reconstruction/Analysis then proceed normally
- One exception is that the Cal Clustering will need to be run in a multiple cluster finding mode
Subsystems
ACD
CAL
TKR