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 <TVector3.h>


namespace genfit {

class MaterialEffects {

 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 setMagCharge(double magCharge) {mag_charge_ = magCharge;} 

  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,
               Material& 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);


  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_;
  double charge_;
  double mag_charge_; // in units of e+
  double mass_;

  int mscModelCode_; 

  AbsMaterialInterface* materialInterface_;

  unsigned int debugLvl_;

  // ClassDef(MaterialEffects, 1);

};

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