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Question Discrepancies between simulated and real histogram (Silicon Detector) 

Forum: Hits, Digitization and Pileup
Date: 27 Apr, 2009
From: I.Mateos <I.Mateos>

We are simulating a Radiation Monitor (RM) and beam line using GEANT4. The simulation geometry is made up of the copper beam degrader plates, the aluminium box housing the RM, the cooper RM shield containing 2 Printed Circuit Boards (PCBs) and 2 Silicon Detectors mounted on ceramic substrates in a telescopic configuration.

The beam is simulated as a 255.27 MeV, parallel beam with a Gaussian energy profile and a flat radial profile with a diameter of 40 mm (wide enough to irradiate the detector uniformly). The simulation records the energy deposited in the Silicon detector and a Gaussian noise of 20 keV is added to mimic electronic noise.

The problem is that we have discrepancies between real and simulated histogram. Any comments about this discrepancies will be more than welcome.

I attach beam properties and the plot with the simulated and real data.

#beam properties (undegraded):
 /gps/particle proton 
/gps/pos/type Beam 
/gps/pos/rot1 1 0 0
/gps/pos/rot2 0 1 0
/gps/pos/shape Circle
/gps/pos/centre 22.5 -59.0 -490.0 mm
/gps/pos/radius 20.0 mm
/gps/direction 0 0 1
/gps/energy 255.27 MeV
/gps/ene/type Gauss
/gps/ene/sigma 3.556 MeV

Thanks in advanced!!

Cheers

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2009/04/27/03.33-98651-m_2.04e5p_noise_20keV.pdf

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