Gabriele Cosmo
339 lines
16 KiB
C++
339 lines
16 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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// Author: Alexei Sytov
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// Co-author: Gianfranco Paternò (modifications & testing)
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// On the base of the CRYSTALRAD realization of scattering model:
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// A. I. Sytov, V. V. Tikhomirov, and L. Bandiera PRAB 22, 064601 (2019)
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#ifndef G4VChannelingFastSimCrystalData_h
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#define G4VChannelingFastSimCrystalData_h 1
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#include "G4ios.hh"
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#include "globals.hh"
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#include "G4ThreeVector.hh"
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#include "Randomize.hh"
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#include "G4LogicalVolume.hh"
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#include "G4Material.hh"
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#include "G4VSolid.hh"
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#include <unordered_map>
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#include "G4ChannelingFastSimInterpolation.hh"
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/** \file G4VChannelingFastSimCrystalData.hh
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* \brief Definition of the G4VChannelingFastSimCrystalData class
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* The class contains the data and properties related to the crystal lattice as well as
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* functions to simulate of important physical processes, i.e. coulomb scattering on
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* screened atomic potential, on single electrons and ionization energy losses;
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* functions of electric fields, nuclear and electron densities and minimum energy
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* of ionization (the corresponding interpolation coefficients are in
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* G4ChannelingFastSimInterpolation).
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* The functions related to the crystal geometry (transformation of coordinates and angles
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* from the reference system of the bounding box of the local volume to
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* the crystal lattice co-rotating reference system and vice versa) and
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* initialization function SetMaterialProperties are created as virtual to make
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* material data input and geometry functions flexible for modification.
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*/
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class G4VChannelingFastSimCrystalData{
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public:
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G4VChannelingFastSimCrystalData();
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virtual ~G4VChannelingFastSimCrystalData();
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///electric fields produced by crystal lattice
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G4double Ex(G4double x,G4double y) {return (fElectricFieldX->GetIF(x,y))*(-fZ2/fPV);}
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G4double Ey(G4double x,G4double y) {return (fElectricFieldY->GetIF(x,y))*(-fZ2/fPV);}
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///electron density function
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G4double ElectronDensity(G4double x,G4double y)
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{
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G4double nel0=fElectronDensity->GetIF(x,y);
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if(nel0<0.) {nel0=0.;}//exception, errors of interpolation functions
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return nel0;
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}
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///minimum energy of ionization function
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G4double MinIonizationEnergy(G4double x,G4double y)
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{return fMinIonizationEnergy->GetIF(x,y);}
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///nuclear density function (normalized to average nuclear density)
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G4double NuclearDensity(G4double x,G4double y, G4int ielement)
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{return std::abs(fNucleiDensity[ielement]->GetIF(x,y));}
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//abs to describe exception, errors of interpolation functions,
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//don't put it =0, otherwise division on 0 in CoulombAtomicScattering
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///Calculate the value of the Lindhard angle (!!! the value for a straight crystal)
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G4double GetLindhardAngle(G4double etotal, G4double mass, G4double charge);
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///Calculate the value of the Lindhard angle (!!! the value for a straight crystal)
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G4double GetLindhardAngle();//return the Lindhard angle value calculated in
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//SetParticleProperties
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///Calculate simulation step (standard value for channeling particles and
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///reduced value for overbarrier particles)
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G4double GetSimulationStep(G4double tx,G4double ty);
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///Calculate maximal simulation step (standard value for channeling particles)
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G4double GetMaxSimulationStep(G4double etotal, G4double mass, G4double charge);
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///get particle velocity/c
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G4double GetBeta(){return fBeta;}
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G4int GetNelements() {return fNelements;}
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G4int GetModel() {return iModel;}//=1 for planes, =2 for axes
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///get bending angle of the crystal planes/axes
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///(default BendingAngle=0 => straight crystal);
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G4double GetBendingAngle(){return fBendingAngle;}
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///fBendingAngle MAY BE NOT THE SAME AS THE BENDING ANGLE OF THE CRYSTAL VOLUME:
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///THE VOLUME OF A BENT CRYSTAL MAY BE G4Box, while the planes/axes inside may be bent
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G4double GetMiscutAngle(){return fMiscutAngle;}
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///get crystal curvature
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///for crystalline undulator the curvature is a function, otherwise it's a constant
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G4double GetCurv(G4double z){return fCU ? -fCUK2*GetCUx(z) : fCurv;}
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///get crystalline undulator wave function
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G4double GetCUx(G4double z){return fCUAmplitude*std::cos(fCUK*z+fCUPhase);}
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///get crystalline undulator wave 1st derivative function
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G4double GetCUtetax(G4double z){
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return fCU ? -fCUAmplitudeK*std::sin(fCUK*z+fCUPhase) : 0;}
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///find and upload crystal lattice input files, calculate all the basic values
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///(to do only once)
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virtual void SetMaterialProperties(const G4Material* crystal,
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const G4String &lattice,
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const G4String &filePath) = 0;
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///set geometry parameters from current logical volume
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void SetGeometryParameters(const G4LogicalVolume *crystallogic);
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///set bending angle of the crystal planes/axes
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///(default fBendingAngle=0 => straight crystal);
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///only non-negative values! crystal is bent in the positive direction of x
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void SetBendingAngle(G4double tetab, const G4LogicalVolume *crystallogic);
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///fBendingAngle MAY BE NOT THE SAME AS THE BENDING ANGLE OF THE CRYSTAL VOLUME
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///THE VOLUME OF A BENT CRYSTAL MAY BE G4Box, while the planes/axes inside may be bent
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///set miscut angle (default fMiscutAngle=0), acceptable range +-1 mrad,
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///otherwise geometry routines may be unstable
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void SetMiscutAngle(G4double tetam, const G4LogicalVolume *crystallogic);
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///set crystalline undulator parameters: amplitude, period and phase
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/// (default: all 3 value = 0)
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/// function to use in Detector Construction
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void SetCrystallineUndulatorParameters(G4double amplitude,
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G4double period,
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G4double phase,
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const G4LogicalVolume *crystallogic);
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///set crystalline undulator parameters (internal function of the model)
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///for convenience we put amplitude, period and phase in a G4ThreeVector
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void SetCUParameters(const G4ThreeVector &litudePeriodPhase,
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const G4LogicalVolume *crystallogic);
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///recalculate all the important values
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///(to do both at the trajectory start and after energy loss)
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void SetParticleProperties(G4double etotal,
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G4double mp,
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G4double charge,
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const G4String& particleName);
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///calculate the coordinates in the co-rotating reference system
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///within a channel (periodic cell)
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///(connected with crystal planes/axes either bent or straight)
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virtual G4ThreeVector CoordinatesFromBoxToLattice(const G4ThreeVector &pos0) = 0;
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///calculate the coordinates in the Box reference system
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///(connected with the bounding box of the volume)
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virtual G4ThreeVector CoordinatesFromLatticeToBox(const G4ThreeVector &pos) = 0;
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///change the channel if necessary, recalculate x o y
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virtual G4ThreeVector ChannelChange(G4double& x, G4double& y, G4double& z) = 0;
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///return correction of the longitudinal coordinate
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/// (along current plane/axis vs "central plane/axis")
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G4double GetCorrectionZ(){return fCorrectionZ;}
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///calculate the horizontal angle in the co-rotating reference system
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///within a channel (periodic cell)
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///(connected with crystal planes/axes either bent or straight)
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virtual G4double AngleXFromBoxToLattice(G4double tx, G4double z)=0;
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///calculate the horizontal angle in the Box reference system
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///(connected with the bounding box of the volume)
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virtual G4double AngleXFromLatticeToBox(G4double tx, G4double z)=0;
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///auxialiary function to transform the horizontal angle
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virtual G4double AngleXShift(G4double z)=0;
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///multiple and single scattering on screened potential
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G4ThreeVector CoulombAtomicScattering(
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G4double effectiveStep,
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G4double step,
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G4int ielement);
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///multiple and single scattering on electrons
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G4ThreeVector CoulombElectronScattering(G4double eMinIonization,
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G4double electronDensity,
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G4double step);
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///ionization losses
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G4double IonizationLosses(G4double dz, G4int ielement);
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void SetVerbosity(G4int ver){fVerbosity = ver;}
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protected:
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///classes containing interpolation coefficients
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//horizontal electric field data
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G4ChannelingFastSimInterpolation* fElectricFieldX{nullptr};
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//vertical electric field data
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G4ChannelingFastSimInterpolation* fElectricFieldY{nullptr};
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//electron density data
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G4ChannelingFastSimInterpolation* fElectronDensity{nullptr};
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//minimal energy of ionization data
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G4ChannelingFastSimInterpolation* fMinIonizationEnergy{nullptr};
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//nuclear density distributions data
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std::vector <G4ChannelingFastSimInterpolation*> fNucleiDensity;
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///values related to the crystal geometry
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G4ThreeVector fHalfDimBoundingBox;//bounding box half dimensions
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G4int fBent=0;//flag of bent crystal,
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//=0 for straight and =1 for bent, by default straight crystal
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G4double fBendingAngle=0.;// angle of bending of the crystal planes/axes
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//inside the crystal volume
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//MAY BE NOT THE SAME AS THE BENDING ANGLE OF THE CRYSTAL VOLUME
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//THE VOLUME OF A BENT CRYSTAL MAY BE G4Box,
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//while the planes/axes inside may be bent
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G4double fBendingR = 0.; // bending radius of the crystal planes/axes
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G4double fBending2R=0.; // =2*fBendingR
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G4double fBendingRsquare=0.; // =fBendingR**2
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G4double fCurv=0.; //=1/fBendingR bending curvature of the crystal planes/axes
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G4double fMiscutAngle = 0.;// miscut angle, can be of either sign or 0;
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//safe values |ThetaMiscut|<0.001
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G4double fCosMiscutAngle=1.;// = std::cos(fMiscutAngle), to economy operations
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G4double fSinMiscutAngle=0.;// = std::sin(fMiscutAngle), to economy operations
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G4double fCorrectionZ = 1.;//correction of the longitudinal coordinate
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//(along current plane/axis vs "central plane/axis"), 1 is default value
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//(for "central plane/axis" or a straight crystal)
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G4bool fCU = false;//flag of crystalline undulator geometry
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//(periodically bent crystal)
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G4double fCUAmplitude=0.; //Amplitude of a crystalline undulator
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G4double fCUK=0.; //2*pi/period of a crystalline undulator
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G4double fCUPhase=0.;//Phase of a crystalline undulator
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G4double fCUAmplitudeK=0.;//fCUAmplitude*fCUK
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G4double fCUK2=0.; //fCUK^2
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///values related to the crystal lattice
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G4int fNelements=1;//number of nuclear elements in a crystal
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G4int iModel=1;// model type (iModel=1 for interplanar potential,
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//iModel=2 for the interaxial one)
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G4double fVmax=0; // the height of the potential well
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G4double fVmax2=0; // =2*fVmax
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G4double fVMinCrystal=0;// non-zero minimal potential inside the crystal,
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// necessary for angle recalculation for entrance/exit
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//through the crystal lateral surface
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G4double fChangeStep=0;// fChannelingStep = fChangeStep/fTetaL
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std::vector <G4double> fI0; //Mean excitation energy
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std::vector <G4double> fRF;//Thomas-Fermi screening radius
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///angles necessary for multiple and single coulomb scattering
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//minimal scattering angle by coulomb scattering on nuclei
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//defined by shielding by electrons
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std::vector <G4double> fTeta10;//(in the Channeling model
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//teta1=fTeta10/fPz*(1.13+fK40/vz**2)
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//maximal scattering angle by coulomb scattering on nuclei defined by nucleus radius
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std::vector <G4double> fTetamax0;//(in the Channeling model tetamax=fTetamax0/fPz)
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std::vector <G4double> fTetamax2;//=tetamax*tetamax
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std::vector <G4double> fTetamax12;//=teta1*teta1+tetamax*tetamax
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std::vector <G4double> fTeta12; //= teta1*teta1
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///coefficients necessary for multiple and single coulomb scattering
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std::vector <G4double> fK20; //a useful coefficient, fK2=fK20/fPV/fPV
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std::vector <G4double> fK2; //a useful coefficient,
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//fK2=(fZ2*alpha*hdc)**2*4.*pi*fN0*(fZ1/fPV)**2
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std::vector <G4double> fK40; //a useful coefficient, fK40=3.76D0*(alpha*fZ1)**2
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G4double fK30=0;//a useful coefficient, fK3=fK30/fPV/fPV
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G4double fK3=0;//a useful coefficient, fK3=2.*pi*alpha*hdc/electron_mass_c2/(fPV)**2
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std::vector <G4double> fKD; //a useful coefficient for dE/dx
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std::vector <G4double> fLogPlasmaEdI0; //item of delta-correction of ionization loss
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///coefficients for multiple scattering suppression
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std::vector <G4double> fPu11;//a useful coefficient for exponent containing u1
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std::vector <G4double> fPzu11;//a useful coefficient for exponent containing u1
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std::vector <G4double> fBB;//a useful coefficient
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std::vector <G4double> fE1XBbb;//a useful coefficient
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std::vector <G4double> fBBDEXP;//a useful coefficient
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//Variable to control printout
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G4int fVerbosity = 1;
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private:
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//exponential integral
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G4double expint(G4double x);
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///private variables
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std::unordered_map<G4int, G4double> fMapBendingAngle;//the map fBendingAngle
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//for different logical volumes
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std::unordered_map<G4int, G4double> fMapMiscutAngle;//the map fMiscutAngle
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//for different logical volumes
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std::unordered_map<G4int, G4ThreeVector> fMapCUAmplitudePeriodPhase;//the map of
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//AmplitudePeriodPhase
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//for different logical volumes
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G4double fChannelingStep=0;// simulation step under the channeling conditions =
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//channeling oscillation length/fNsteps
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// channeling oscillation length: Biryukov book Eq. (1.24)
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///energy depended values
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G4double fPz=0; // particle momentum absolute value
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G4double fPV=0; // pv
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G4double fTetaL=0; //Lindhard angle
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G4double fBeta=0; //particle (velocity/c)
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G4double fV2=0; // particle (velocity/c)^2
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G4double fGamma=0; //Lorentz factor
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G4double fMe2Gamma=0; // me^2*fGamma
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G4double fTmax=0; // max ionization losses
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///particle properties flags
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G4String fParticleName = "";
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G4double fZ2=0; //particle charge
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};
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#endif
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