Gabriele Cosmo
160 lines
6.8 KiB
C++
160 lines
6.8 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// $Id: $
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//
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// -----------------------------------------------------------------------------
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//
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// GEANT4 Class header file
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//
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// File name: G4PWATotalXsecTable
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//
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// Author: Mihaly Novak
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//
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// Creation date: 18.05.2015
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//
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// Class description:
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// Class to load and handle elastic, first and second transport cross sections
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// precomputed by using ELSEPA [1] in the 100 eV - 1 GeV kinetic and Z = 1-103
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// energy range for electrons and positrons.G4PWATotalXsecZ is responsible to
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// to handle cross sections by individual Z that are used in the current
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// geometry and G4PWATotalXsecTable is a collection of G4PWATotalXsecZ objects.
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//
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// Modifications:
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//
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// References:
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// [1] Francesc Salvat, Aleksander Jablonski, Cedric J Powell,
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// ELSEPA—Dirac partial-wave calculation of elastic scattering of electrons
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// and positrons by atoms, positive ions and molecules,
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// Computer physics communications; 165, 2, (2005)
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//
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// -----------------------------------------------------------------------------
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#ifndef G4PWATotalXsecTable_h
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#define G4PWATotalXsecTable_h 1
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#include "G4Types.hh"
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////////////////////////////////////////////////////////////////////////////////
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// G4PWATotalXsecZ: sub-class for PWA xsec data that belong to a given Z number
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////////////////////////////////////////////////////////////////////////////////
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class G4PWATotalXsecZ
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{
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friend class G4PWATotalXsecTable;
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public:
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//
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// out of energy grid cases
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G4int GetLowestEnergyBinIndex() const {return 0;}
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G4int GetHighestEnergyBinIndex()const {return fgNumTotalXsecBins-1;}
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G4double GetLowestEnergy() const {return fgPWATotalXsecEnergyGrid[0];}
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G4double GetHighestEnergy()const {return fgPWATotalXsecEnergyGrid[fgNumTotalXsecBins-1];}
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// see below what is input parameter j
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G4double GetLowestXsecValue(G4int j) const {return fPWAXsecs[j*fgNumTotalXsecBins];}
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G4double GetHighestXsecValue(G4int j)const {return fPWAXsecs[(j+1)*fgNumTotalXsecBins-1];}
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//
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// normal cases i.e. energy is within the grid
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// kinetic energy in MeV ; returns with the index of the lower energy bin edge
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G4int GetPWATotalXsecEnergyBinIndex(G4double energy) const;
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//------------------------------------------------------------------------------//
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// The GetPWATotalXsecEnergyBinIndex(energy) will return with the lower energy //
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// bin edge index = elowindx. Then the following formulas can be used to get the//
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// elastic, first and second transport mean free path lower bin edge values: //
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// index of the lower energy bin edge = j*fgNumTotalXsecBins + elowindex //
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// where j is //
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// -elastic cross section lower bin edge index: j = 1.5 + chrage*1.5 //
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// -first transport cross section lower energy bin index: j = 2.5 + chrage*1.5 //
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// -first transport cross section lower energy bin index: j = 3.5 + chrage*1.5 //
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// With this, we can avoid to use an IF over particle types (e-/e+) //
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// Additional note: it's probably a good idea to separate the elowindex comp- //
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// utation because it depends only on the energy of the particle while the //
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// cross sections depends on Z and particle type as well //
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//------------------------------------------------------------------------------//
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G4double GetInterpXsec(G4double energy, G4int elowindex, G4int j) const ;
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G4double GetInterpXsec(G4double energy, G4int j) const ;
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private:
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// ctr and dtr can be called only by the G4PWATotalXsecTable friend
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G4PWATotalXsecZ(G4int Z);
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~G4PWATotalXsecZ(){};
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// hide assignment operator and cpy ctr.
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G4PWATotalXsecZ & operator=(const G4PWATotalXsecZ &right);
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G4PWATotalXsecZ(const G4PWATotalXsecZ&);
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void LoadPWATotalXsecZ(G4int Z);
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private:
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//size of the common energy grid //
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static const G4int fgNumTotalXsecBins = 106;
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// common energy grid in [1.e-4;1.e+3] MeV //
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// size is fgNumTotalXsecBins
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static const G4double fgPWATotalXsecEnergyGrid[fgNumTotalXsecBins];
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// elastic cross sections, first and second transport cross sections for e-/e+
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// over the common energy grid fgPWATotalXsecEnergyGrid in Geant4 internal length^2
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G4double fPWAXsecs[fgNumTotalXsecBins*6];
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// interpolation parameters if log-log linear interpolation is used
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G4double fInterpParamA[fgNumTotalXsecBins*6];
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G4double fInterpParamB[fgNumTotalXsecBins*6];
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};
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////////////////////////////////////////////////////////////////////////////////
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// G4PWATotalXsecTable
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////////////////////////////////////////////////////////////////////////////////
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class G4PWATotalXsecTable
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{
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public:
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G4PWATotalXsecTable() {};
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~G4PWATotalXsecTable();
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void Initialise();
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const G4PWATotalXsecZ* GetPWATotalXsecForZet(G4int Z) const{
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Z = Z>fgNumZet ? fgNumZet : Z;
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return fgPWATotalXsecTable[Z-1];
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}
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private:
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// hide assignment operator and cpy ctr.
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G4PWATotalXsecTable & operator=(const G4PWATotalXsecTable &right);
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G4PWATotalXsecTable(const G4PWATotalXsecTable&);
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private:
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// size of the table: Z=1-103 //
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static const G4int fgNumZet = 103;
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// G4PWATotalXsecZ pointers for Z=1-103 //
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static G4PWATotalXsecZ *fgPWATotalXsecTable[fgNumZet];
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};
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#endif
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