Package Alignment/LaserAlignmentSimulation

Source code (CVS tag: @) - Administrative privileges

Description

Simulation of the Laser Alignment System. This package contains a SimWatcher to OscarProducer which takes care of the appropriate actions during the various simulation steps.

Public interface

• LaserBeamsBarrel: position particle gun in the Barrel to simulate the laser beams which connect both TECs with TIB and TOB.
• LaserBeamsTEC1: position particle guns in the TEC+ (both Ring 4 and Ring 6).
• LaserBeamsTEC2: position particle guns in the TEC+ (both Ring 4 and Ring 6).
• LaserOpticalPhysicsList: activate optical processes in GEANT4 (e.g. refraction).
• LaserPrimaryGeneratorAction: uses LaserBeamsBarrel, LaserBeamsTEC1 and LaserBeamsTEC2 to position particle guns in the detector and shoot optical photons into the detector. In this way the laser beams are simulated.
• LaserSteppingAction: check if absorption in a Silicon module has occurred and set the energy deposit.
• LaserSteppingVerbose: verbose output during stepping.
• LaserTrackingAction: user actions during tracking of particles through the detector.
• MaterialProperties: set properties of materials in the detector: refraction index, absorption length, etc.

Modules

• LaserAlignmentSimulation: this is the SimWatcher which supplies the simulation of the Laser Alignment System.

  include "SimG4Core/Configuration/data/SimG4Core.cff"
  replace g4SimHits.Watchers = {
    { string type = "LaserAlignmentSimulation"
      untracked int32 DebugLevel = 0
      untracked int32 MaterialPropertiesDebugLevel = 1
      untracked double SiAbsorptionLengthScalingFactor = 1.0
      untracked double EnergyLossScalingFactor = 1739.130435
      untracked double PhotonEnergy = 1.15
      untracked int32 NumberOfPhotonsInParticleGun = 10
      untracked int32 NumberOfPhotonsInEachBeam = 100
    }
  }
  

• LaserAlignmentProducer: producer to provide an empty MCHepEvent.

  module laserAlignmentProducer  = LaserAlignmentProducer
  {
  }
  

• LaserOpticalPhysics: Custom Physics to activate optical processes.

  include "SimG4Core/Configuration/data/SimG4Core.cff"
  replace g4SimHits.Physics.type = "SimG4Core/Physics/LaserOpticalPhysics"
  

Unit tests and examples

• SimAnalyzer: get some statistics and plots about the simulation of the Laser Alignment System.

  module ana = SimAnalyzer 
  {
    untracked int32 DebugLevel = 3
    untracked string ROOTFileName = "simulation.histos.root"
    untracked int32 ROOTFileCompression = 1
    untracked double SearchWindowPhiTIB = 0.05
    untracked double SearchWindowPhiTOB = 0.05
    untracked double SearchWindowPhiTEC = 0.05
    untracked double SearchWindowZTIB = 1.0
    untracked double SearchWindowZTOB = 1.0
  }
  

• LaserSimulation.cfg: configuration file to run the simulation of the Laser Alignment System.

Status and planned development

Stable

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Last updated: @ Author: Maarten Thomas.