MaterialEffects.h

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/* Copyright 2008-2014, Technische Universitaet Muenchen,
   Authors: Christian Hoeppner & Sebastian Neubert & Johannes Rauch

   This file is part of GENFIT.

   GENFIT is free software: you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as published
   by the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   GENFIT is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with GENFIT.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef genfit_MaterialEffects_h
#define genfit_MaterialEffects_h

#include "RKTools.h"
#include "AbsMaterialInterface.h"

#include <iostream>
#include <vector>

#include <TObject.h>
#include <TVector3.h>

namespace genfit {

class MaterialEffects : public TObject {

 private:
  MaterialEffects();
  virtual ~MaterialEffects();

  static MaterialEffects *instance_;

 public:
  static MaterialEffects *getInstance();
  static void destruct();

  void init(AbsMaterialInterface *matIfc);
  bool isInitialized() { return materialInterface_ != nullptr; }

  void setNoEffects(bool opt = true) { noEffects_ = opt; }

  void setEnergyLossBetheBloch(bool opt = true)
  {
    energyLossBetheBloch_ = opt;
    noEffects_ = false;
  }
  void setNoiseBetheBloch(bool opt = true)
  {
    noiseBetheBloch_ = opt;
    noEffects_ = false;
  }
  void setNoiseCoulomb(bool opt = true)
  {
    noiseCoulomb_ = opt;
    noEffects_ = false;
  }
  void setEnergyLossBrems(bool opt = true)
  {
    energyLossBrems_ = opt;
    noEffects_ = false;
  }
  void setNoiseBrems(bool opt = true)
  {
    noiseBrems_ = opt;
    noEffects_ = false;
  }
  void ignoreBoundariesBetweenEqualMaterials(bool opt = true) { ignoreBoundariesBetweenEqualMaterials_ = opt; }

  void setMscModel(const std::string &modelName);

  double effects(const std::vector<RKStep> &steps, int materialsFXStart, int materialsFXStop, const double &mom, const int &pdg, M7x7 *noise = nullptr);

  void stepper(const RKTrackRep *rep, M1x7 &state7,
               const double &mom,  // momentum
               double &relMomLoss, // relative momloss for the step will be added
               const int &pdg, MaterialProperties &currentMaterial, StepLimits &limits, bool varField = true);

  void setDebugLvl(unsigned int lvl = 1);

  void drawdEdx(int pdg = 11);

 private:
  void getParticleParameters();

  void getMomGammaBeta(double Energy, double &mom, double &gammaSquare, double &gamma, double &betaSquare) const;


  double momentumLoss(double stepSign, double mom, bool linear);

  double dEdx(double Energy) const;

  double dEdxBetheBloch(double betaSquare, double gamma, double gammasquare) const;


  void noiseBetheBloch(M7x7 &noise, double mom, double betaSquare, double gamma, double gammaSquare) const;


  void noiseCoulomb(M7x7 &noise, const M1x3 &direction, double momSquare, double betaSquare) const;


  double dEdxBrems(double mom) const;


  void noiseBrems(M7x7 &noise, double momSquare, double betaSquare) const;

  bool noEffects_;

  bool energyLossBetheBloch_;
  bool noiseBetheBloch_;
  bool noiseCoulomb_;
  bool energyLossBrems_;
  bool noiseBrems_;

  bool ignoreBoundariesBetweenEqualMaterials_;

  const double me_; // electron mass (GeV)

  double stepSize_; // stepsize

  // cached values for energy loss and noise calculations
  double dEdx_; // Runkge Kutta dEdx
  double E_;    // Runge Kutta Energy
  double matDensity_;
  double matZ_;
  double matA_;
  double radiationLength_;
  double mEE_; // mean excitation energy

  int pdg_;
  int charge_;
  double mass_;

  int mscModelCode_; 

  AbsMaterialInterface *materialInterface_;

  unsigned int debugLvl_;

  // ClassDef(MaterialEffects, 1);
};

} /* End of namespace genfit */
#endif // genfit_MaterialEffects_h