[Clas12_rgb] DVCS MC check with Mauri's new gcard
Silvia Niccolai
silvia at jlab.org
Tue Oct 22 05:08:36 EDT 2019
Hello all,
following our discussion of last week, I have run pDVCS and nDVCS
full simulations, and compared the outputs obtained with the standard RGB
gcard and with the new one that Mauri sent us, containing his new rohacell
scattering chamber.
I generated roughly the same number of events for the two sets of
simulations.
The results are in the attached figures: noshield is the standard gcard,
shield is with the new rohacell piece.
I am plotting rec-gen quantities. In each of the three columns are p,
theta, phi, while the lines are: electron, proton, photon, and neutron.
You can try to play spot the differences, but to me it all looks pretty
equal.
So, I'd conclude that from the DVCS point of view the new scattering
chamber has no negative impact.
I didn't check with interactive gemc to make sure that the new geometry
was correctly implemented, but from the gemc log of my jobs it seems like
it correctly imported the "e" variations for the target.
>From my point of view, therefore:
- if this new scattering chamber reduces the DC occupancies and thus
improves ttracking efficiency, as Maurizio showed last week;
- if its construction and installation won't affect our schedule;
- if the other experiments' spokespeople agree
I'd say we can go ahead and use it.
Best regards,
Silvia
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