[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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