The Meaning of the Run Number
From GlueXWiki
Input Run Number:
- External Generator (bggen): encoded in events
- Internal Generator (particle gun): default value
- RUNNO FFREAD card: change the run used for CCDB look-up (pull request to remove issued)
- RUNG FFREAD card: native GEANT (sets non-default internal generator run number?)
Use in HDGeant3/4:
- Look up calibration constants
- Note: also affected by CCDB variation
- Encode in output events
Richard's proposal for HDGeant4:
- For calibration look-up, hierarchy of sources:
- RUNNO
- RUNG
- run number encoded in input events
- run number encoded in output events same as that used for calibration look-up
mcsmear has similar issue if user wants to control number used in calibration