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Add bunch structures/pileup for MC21 testing

Peter Onyisi requested to merge ponyisi/athena:master-a-few-commits-about-bunch-structures-and-pileup into master

Adds

  • BunchStructure_Fill7314_BCMSPattern_Flat.py : uniform bunch luminosity (0 or 1 intensity for all bunches)
  • BunchStructure_Fill7314_BCMSPattern_Early.py : bunch-by-bunch pattern for LB 200 in fill 7314 (early, less dispersion)
  • PileUpProfile_run410000_MC21a_MultiBeamspot.py : PU distribution intended to be used with uniform bunch intensity structure (so it is the convolution of the bunch-to-bunch structure with the average pileup distribution). Uses "step" mechanism to separate the four LB ranges for different beamspot sizes/pileup. Steps 1, 2, 3 are convolution of BunchStructure_Fill7314_BCMSPattern_Early.py with average pileup 52, step 4 is convolution of BunchStructure_Fill7314_BCMSPattern.py (high dispersion) with flat 25-52 average pileup profile.

Attn @jchapman @tlari @tadej ej @demers @jferrand

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