underground_physics/src/DMXMaxTimeCuts.cc

0001 //
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0025 //
0026 //
0027 // --------------------------------------------------------------
0028 //   GEANT 4 - Underground Dark Matter Detector Advanced Example
0029 //
0030 //      For information related to this code contact: Alex Howard
0031 //      e-mail: alexander.howard@cern.ch
0032 // --------------------------------------------------------------
0033 // Comments
0034 //
0035 //                  Underground Advanced
0036 //               by A. Howard and H. Araujo
0037 //                    (27th November 2001)
0038 //
0039 // MaxTimeCuts program
0040 // --------------------------------------------------------------
0041
0042 #include "DMXMaxTimeCuts.hh"
0043
0044 #include "G4PhysicalConstants.hh"
0045 #include "G4Step.hh"
0046 #include "G4UserLimits.hh"
0047 #include "G4VParticleChange.hh"
0048
0049 DMXMaxTimeCuts::DMXMaxTimeCuts(const G4String& aName)
0050   : DMXSpecialCuts(aName)
0051 {
0052    if (verboseLevel>1) {
0053      G4cout << GetProcessName() << " is created "<< G4endl;
0054    }
0055    SetProcessType(fUserDefined);
0056 }
0057
0058 DMXMaxTimeCuts::~DMXMaxTimeCuts()
0059 {}
0060
0061 DMXMaxTimeCuts::DMXMaxTimeCuts(DMXMaxTimeCuts&)
0062  : DMXSpecialCuts()
0063 {}
0064
0065
0066 G4double DMXMaxTimeCuts::PostStepGetPhysicalInteractionLength(
0067                              const G4Track& aTrack,
0068                  G4double ,
0069                  G4ForceCondition* condition
0070                 )
0071 {
0072   // condition is set to "Not Forced"
0073   *condition = NotForced;
0074
0075    G4double     proposedStep = DBL_MAX;
0076    // get the pointer to UserLimits
0077    G4UserLimits* pUserLimits = aTrack.GetVolume()->GetLogicalVolume()->GetUserLimits();
0078    const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
0079
0080    // can apply cuts for specific particles - use if(particleDef):
0081    //   G4ParticleDefinition* aParticleDef = aTrack.GetDefinition();
0082
0083    //   G4cout << " Time: " << pUserLimits->GetUserMaxTime(aTrack) << G4endl;
0084
0085    if (pUserLimits) {
0086      G4double temp = DBL_MAX;
0087      //max time limit
0088      G4double dTime= (pUserLimits->GetUserMaxTime(aTrack) - aTrack.GetGlobalTime());
0089      if (dTime < 0. ) {
0090        proposedStep = 0.;
0091      } else {
0092        G4double beta = (aParticle->GetTotalMomentum())/(aParticle->GetTotalEnergy());
0093        temp = beta*c_light*dTime;
0094        if (proposedStep > temp) proposedStep = temp;
0095      }
0096
0097    }
0098    return proposedStep;
0099 }