FCAL Response

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What follows is a rough outline of the features of the FCAL simulation and response.

Simulation Parameters

  • attenuation length: 100 cm
  • speed of light in bar: 15 cm / ns
  • width of block: 4 cm
  • length of block: 45 cm
  • two hit resolution: 75 ns
  • max hits per channel: 100

hitFCal.c / HDGeant

The following actions are performed in hitForwardEMcal. This routine is called by GEANT to process steps taken by charged particles inside of FCAL blocks. Note that GEANT does not simulate Cherenkov photon production inside of the lead glass bars. It simulates the full electromagnetic shower and tracks energy deposition of charged particles through ionization.

  • energy deposited in each step in the block is attenuated using a 100 cm attenuation length
  • hits within 75 ns of each other are merged
  • a 30 MeV threshold per cell is applied
  • a square geometry is simulated


The reconstruction algorithm extracts hits from the DFCALMCResponse factory which does the following:

  • prunes of "corners" of the square geometry to create circular detector
  • applies parametric simulation of Cherenkov photon effects (not yet implemented)
  • simulates appropriate electronics threshold and dead channels (not yet implemented)