Gabriele Cosmo
163 lines
6.3 KiB
C++
163 lines
6.3 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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//
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// ----------------------------------------------------------------------------
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//
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// GEANT4 Class header file
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//
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//
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// File name: G4SBBremTable
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//
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// Author: Mihaly Novak
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//
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// Creation date: 15.07.2018
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//
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// Modifications:
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//
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// Class description:
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//
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// Utility class to handle sampling tables for the Seltzer-Berger scalled brems-
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// strahlung differential cross sections. It makes possible fast (significantly
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// faster than the rejection) sampling of the emitted photon energy in case of
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// interactions. An object from this class is supposed to be a member of the
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// Seltzer-Berger model for e-/e+ bremsstrahlung photon emission model. Note,
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// that one object from this class can handle both e- and e+ cases (containes
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// e+ correction in the SampleEnergyTransfer method only).
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//
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// ----------------------------------------------------------------------------
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#ifndef G4SBBremTable_h
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#define G4SBBremTable_h 1
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#include "globals.hh"
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#include "G4String.hh"
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#include <vector>
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// forward declar
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class G4MaterialCutsCouple;
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class G4SBBremTable {
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public:
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// CTR/DTR
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G4SBBremTable();
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~G4SBBremTable();
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// loads and init sampling tables: lowe/highe are the low/high energy usage
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// limits of the corresponding Seltzerberger-model.
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void Initialize(const G4double lowe, const G4double highe);
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// clean away all sampling tables and makes ready for re-initialisation
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void ClearSamplingTables();
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// run-time method to sample energy transferred to the emitted photon
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double SampleEnergyTransfer(const G4double eekin, const G4double leekin,
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const G4double gcut , const G4double dielSupConst,
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const G4int izet , const G4int matCutIndx,
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const bool iselectron);
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// used only for development: print out table related information
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// void Dump();
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private:
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void BuildSamplingTables();
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void InitSamplingTables();
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void LoadSTGrid();
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void LoadSamplingTables(G4int iz);
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void ReadCompressedFile(const G4String &fname, std::istringstream &iss);
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private:
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// Sampling-Table point: describes one [E_i],[kappa_j] point
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struct STPoint {
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G4double fCum; // value of the cumulative function
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G4double fParA; // rational function approximation based interp. parameter
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G4double fParB; // rational function approximation based interp. parameter
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};
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// Sampling-Table: describes one [E_j] e- energy point i.e. one Table
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struct STable {
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// cumulative values for the kappa-cuts: kappa_cut_i=E_gamma_cut_i/E_el_j
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std::vector<G4double> fCumCutValues;
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// as many STPoint-s as kappa values
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std::vector<STPoint> fSTable;
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};
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// Sampling-Tables for a given Z:
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// describes all tables (i.e. for all e- energies) for a given element (Z)
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struct SamplingTablePerZ {
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SamplingTablePerZ() : fNumGammaCuts(0), fMinElEnergyIndx(-1), fMaxElEnergyIndx(-1) {}
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size_t fNumGammaCuts; // number of gamma-cut for this
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G4int fMinElEnergyIndx; // max(i) such E_i <= E for all E
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G4int fMaxElEnergyIndx; // min(i) such E_i >= E for all E
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std::vector<STable*> fTablesPerEnergy; // as many table as e-ekin grid point
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//the different gamma-cut values that are defined for this element(Z) and ln
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std::vector<G4double> fGammaECuts;
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std::vector<G4double> fLogGammaECuts;
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// the couple index element stores the corresponding (sorted) gamma-cut index
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std::vector<size_t> fMatCutIndxToGamCutIndx;
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// temporary vector to store some indecis during initialisation
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std::vector< std::vector<size_t> > fGamCutIndxToMatCutIndx;
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};
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// simple linear search: most of the time faster than anything in our case
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G4int LinSearch(const std::vector<STPoint>& vect,
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const G4int size,
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const G4double val);
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private:
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// pre-prepared sampling tables are available:
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G4int fMaxZet; // max Z number
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G4int fNumElEnergy; // # e- kine (E_k) per Z
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G4int fNumKappa; // # red. photon eners per E_k
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// min/max electron kinetic energy usage limits
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G4double fUsedLowEenergy;
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G4double fUsedHighEenergy;
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G4double fLogMinElEnergy;
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G4double fILDeltaElEnergy;
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// e- kinetic energy and reduced photon energy grids and tehir logarithms
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std::vector<G4double> fElEnergyVect;
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std::vector<G4double> fLElEnergyVect;
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std::vector<G4double> fKappaVect;
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std::vector<G4double> fLKappaVect;
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// container to store samplingtables per Z (size is fMaxZet+1)
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std::vector<SamplingTablePerZ*> fSBSamplingTables;
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};
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#endif
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