==== Simulation configuration ====
To set the general behaviour of a simulation, a config file mechanism is used. The singleton class ''PRIMASimulationConfig'' is responsible for reading the config file and providing the other classes with the specified config settings.

=== How to define a new command ===
  - Add the variable(s) containing the settings information to class ''PRIMASimulationConfig'', implementing the corresponding "get" method.
  - Initialise these variables in the constructor using their default values. 
  - Add an ''if'' block in the ''while'' loop inside method ''PRIMASimulationConfig::ReadConfFile'', e.g. <code>
if(key == "macro-file"){
	macroFileName = value;
	macroSpecified = 1;
	cout<<"macro file name set to: "<<macroFileName<<endl;
      }</code>
   - Document the new command in this wiki page.


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=== List of commands ===
  * Specify the root file where the geometry (''TGeoManager'' object) to be used in the simulation is saved.     <code>
geometry-file <filename>
</code>
  
  
  * Specify if the tagger/scintillator is used as sensiteve detector (SD):    <code>
use-tagger <0/1>
</code> If there is no scintillator in the geometry, use-tagger needs to be set 0

  * Specify if the clorimeter is used as sensiteve detector (SD):    <code>
use-clorimeter <0/1>
</code> 

  * Specify if radiation studie should be done:    <code>
do-radiation-studies <0/1>
</code> 

  * Specify the geant4 macro file to be executed. If this command is not used the geant4 interactive shell will be loaded. <code>
macro-file <geant4 macro file>
</code>


  * Specify the root file where the simulation output is written. **Attention!** The specified file will be overwritten.<code>
root-output-file test_bwec.root
</code> 


  * Specify the primary generator to be used <code>
primary-generator <generator>
</code> Until now, the following options are available:
    * ''particleGun'': uses the geant4 particle gun which can be set in the macro file
    * ''p16uniform'': generates electron over the surface of proto16, placed at 1.2 m from the particle source. The electron energy is uniformly distributed between 100 MeV and 1500 MeV
    *  ''primaUniform'': generates electrons over the surface of the PRIMA detector (between Rin and Rmin [mm]), placed at 1200 mm (=dz) from the particle source. The electron energy is uniformly distributed between Emin and Emax [MeV].
    *  ''pi0Gun'': generates a pion with arbitrary directon, origin 1.2 m from detector (z-direction). The particles energy is uniformly distributed between Emin and Emax. If Emin = Emax, the particles have a constant initial energy. The pion instantly decays into two photons with random momentum directions constrained by momentum conservation. Also the angles of the pion can be chosen (theta, phiMin, phiMax [deg]).
    *  ''beam'': shoots electrons in z-direction, is positioned a view mm before the target and has to be used with a geometry which includes the target!
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