PHOS Fast Simulation

Figure 1.: Use Case for fast simulation. Only PHOS is implemented. Other detectors are ignored. Click on image for full scale

This has been implemented in a new class AliPHOSvFast ( inheritance tree ). The synopsis goes as follow :

      
      AliPHOSvFast::AliDetector
      
      CreateGeometry()  {

       describes the coarse outline of PHOS as 5 boxes }

      StepManager() {

       when particle reaches PHOS {
         stop the tracking
         modifiy the attributes (energy, momentum, type) of the primary particle according to the PHOS response
         construct a "virtual" reconstructed particle }
       save the reconstructed particle in a list }

      FinishEvent() {

        write the list in TreeR
        write the TreeR to file }