mt01maxtimecuts.cc

利用linux环境下蒙特卡罗计算工具geant4实现伽玛射线与探测器乘积能量的模拟过程

//
// ********************************************************************
// * DISCLAIMER                                                       *
// *                                                                  *
// * The following disclaimer summarizes all the specific disclaimers *
// * of contributors to this software. The specific disclaimers,which *
// * govern, are listed with their locations in:                      *
// *   http://cern.ch/geant4/license                                  *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.                                                             *
// *                                                                  *
// * This  code  implementation is the  intellectual property  of the *
// * GEANT4 collaboration.                                            *
// * By copying,  distributing  or modifying the Program (or any work *
// * based  on  the Program)  you indicate  your  acceptance of  this *
// * statement, and all its terms.                                    *
// ********************************************************************
//
//
// --------------------------------------------------------------
//   GEANT 4 - Underground Dark Matter Detector Advanced Example
//
//      For information related to this code contact: Alex Howard
//      e-mail: [e-mail]
// --------------------------------------------------------------
// Comments
//
//                  Underground Advanced
//               by A. Howard and H. Araujo 
//                    (27th November 2001)
//
// MaxTimeCuts program
// --------------------------------------------------------------

#include "mt01MaxTimeCuts.hh"

#include "G4Step.hh"
#include "G4UserLimits.hh"
#include "G4VParticleChange.hh"
#include "G4EnergyLossTables.hh"


mt01MaxTimeCuts::mt01MaxTimeCuts(const G4String& aName)
  : mt01SpecialCuts(aName)
{
   if (verboseLevel>1) {
     G4cout << GetProcessName() << " is created "<< G4endl;
   }
   SetProcessType(fUserDefined);
}

mt01MaxTimeCuts::~mt01MaxTimeCuts()
{}

mt01MaxTimeCuts::mt01MaxTimeCuts(mt01MaxTimeCuts&)
 : mt01SpecialCuts()
{}

 
G4double mt01MaxTimeCuts::PostStepGetPhysicalInteractionLength(
                             const G4Track& aTrack,
			     G4double ,
			     G4ForceCondition* condition
			    )
{
  // condition is set to "Not Forced"
  *condition = NotForced;

   G4double     proposedStep = DBL_MAX;
   // get the pointer to UserLimits
   G4UserLimits* pUserLimits = aTrack.GetVolume()->GetLogicalVolume()->GetUserLimits();
   const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();

   // can apply cuts for specific particles - use if(particleDef):
   //   G4ParticleDefinition* aParticleDef = aTrack.GetDefinition();

   //   G4cout << " Time: " << pUserLimits->GetUserMaxTime(aTrack) << G4endl;
  
   if (pUserLimits) {
     G4double temp = DBL_MAX;
     //max time limit
     G4double dTime= (pUserLimits->GetUserMaxTime(aTrack) - aTrack.GetGlobalTime());
     if (dTime < 0. ) {
       proposedStep = 0.;
     } else {  
       G4double beta = (aParticle->GetTotalMomentum())/(aParticle->GetTotalEnergy());
       temp = beta*c_light*dTime;
       if (proposedStep > temp) proposedStep = temp;                  
     }

   }
   return proposedStep;
}