[Halld-tagger] Photon spectrum shape

[Alexander Somov]

Hi,

I started looking on the PS reconstruction/calibration.
Here is a 5 min plot which can be of some interest:

https://halldweb.jlab.org/wiki/index.php/Beam_commissioning:_Fall_2015


blue histo: acceptance corrected photon spectrum reconstructed with
             the PS
red markers: energy spectrum of collimated photons from cobrems
              (Geant)

Both spectra have arbitrary normalization.

I didn't play much with the acceptance correction and energy calibration...
(the trigger and PS efficiencies have to be understood as well).


Cheers,
        Alex