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155 bytes added ,  15:28, 29 March 2017
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== EicRoot simulation ==
 
== EicRoot simulation ==
The next step is to run the GEANT tracking of the events through the magnet setup and the Roman Pots within the EicRoot package.  An example script to handle this is found at /direct/eic+u/rmpetti/workarea/roman_pots/sim/simulation.C.  This script will use the events generated above in step 1, as well as the detector constructs from step 3.  Additionally, the magnetic setup in the IR needs to be defined.  Some general information on the importing of magnetic fields into EicRoot can be found [https://wiki.bnl.gov/eic/index.php/Eicroot#Realistic_IR_Magnet_Setup here] or [https://wiki.bnl.gov/eic/index.php/Eicroot#Alternate_Magnet_Lattice_Import here].
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The next step is to run the GEANT tracking of the events through the magnet setup and the Roman Pots within the EicRoot package.  An example script to handle this is found at /direct/eic+u/rmpetti/workarea/roman_pots/sim/simulation.C.  This script will use the events generated above in step 1, as well as the detector constructs from step 3.  Additionally, the magnet setup in the IR needs to be defined.  Some general information on the importing of magnetic fields into EicRoot can be found [https://wiki.bnl.gov/eic/index.php/Eicroot#Realistic_IR_Magnet_Setup here] or [https://wiki.bnl.gov/eic/index.php/Eicroot#Alternate_Magnet_Lattice_Import here].  The indexed versions of the IR magnets that have been studied can be found in the [http://svn.racf.bnl.gov/svn/eic/eicroot/trunk/input/IR/ SVN repository].
    
If one wants to study the effect of the angular divergence, then this step needs to be performed twice.  The simulation.C macro will be run once on the event record without divergence and run again on the event record with divergence.  The output of simulation.C WITHOUT divergence is simply used to gain access to the original, un-smeared, proton p<sub>T</sub> and to pass this value along the simulation chain.  The actual detector hits that will be analyzed later for acceptance and momentum reconstruction studies will utilize the output of simulation.C WITH divergence applied.
 
If one wants to study the effect of the angular divergence, then this step needs to be performed twice.  The simulation.C macro will be run once on the event record without divergence and run again on the event record with divergence.  The output of simulation.C WITHOUT divergence is simply used to gain access to the original, un-smeared, proton p<sub>T</sub> and to pass this value along the simulation chain.  The actual detector hits that will be analyzed later for acceptance and momentum reconstruction studies will utilize the output of simulation.C WITH divergence applied.
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