[Clas12_first_exp] production cut tests

[Maurizio Ungaro]

Hi all,

We need some help in testing the option PRODUCTIONCUTFORVOLUMES for the simulation. Here are some ideas for volunteers:

- semiinclusive (Harut)
- dvcs/dvmp (FX?)
- kLambda (Dan)
- 2 pi (Derek)

The production cut for volume (option PRODUCTIONCUTFORVOLUMES) is introduced to speed up simulations using generators that do not include fiducial cuts.

The following should be studied:

1. reconstruction efficiency and simulation times as a function of production cut, for the values (in mm):
  100, 50, 10, 5, 2, 1

   This study is aimed at verifying that the option does not affect reconstruction efficiency.

2. DC occupancy and simulation times with luminosity beam on target, CLAS12 50% luminosity, for the above values of PRODUCTIONCUTFORVOLUMES

  We know that this cut, at 100mm,  reduces the DC occupancy produced by geant4 background by more than a factor of 2.
  Perhaps there is a sweet spot of the value of this cut where the DC occupancy is not affected but the speed is significantly improved

The execution time can be retrieved from the end log of gemc.

Please contact me if you can help with this.

Mauri
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