203 lines
7.5 KiB
C++
203 lines
7.5 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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// Class: G4IonDEDXScalingICRU73
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//
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// Base class: G4VIonDEDXScalingAlgorithm
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//
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// Author: Anton Lechner (Anton.Lechner@cern.ch)
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//
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// First implementation: 10. 05. 2009
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//
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// Modifications: 12. 11. 2009 - Moved all decision logic concerning ICRU 73
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// scaling for heavy ions into this class.
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// Adapting ScalingFactorEnergy class according
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// to changes in base class (AL).
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//
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// Class description:
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// dE/dx scaling algorithm applied on top of ICRU 73 data (for ions not
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// covered by the ICRU 73 report)
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//
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// Comments:
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//
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// ===========================================================================
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#ifndef G4IONDEDXSCALINGICRU73_HH
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#define G4IONDEDXSCALINGICRU73_HH
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#include "globals.hh"
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#include "G4VIonDEDXScalingAlgorithm.hh"
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#include "G4Material.hh"
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#include "G4ParticleDefinition.hh"
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#include <vector>
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#include "G4Exp.hh"
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class G4IonDEDXScalingICRU73 : public G4VIonDEDXScalingAlgorithm {
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public:
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explicit G4IonDEDXScalingICRU73(G4int minAtomicNumberIon = 19,
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G4int maxAtomicNumberIon = 102);
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~G4IonDEDXScalingICRU73();
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// Function for scaling the kinetic energy (no scaling by default).
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// Returns scaling factor for a given ion.
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G4double ScalingFactorEnergy(
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const G4ParticleDefinition* particle, // Projectile (ion)
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const G4Material* material) override; // Target material
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// Function for scaling the dE/dx value (no scaling by default).
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// Returns scaling factor for a given ion-material couple and
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// a given kinetic energy.
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G4double ScalingFactorDEDX(
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const G4ParticleDefinition* particle, // Projectile (ion)
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const G4Material*, // Target material
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G4double kineticEnergy) override; // Kinetic energy
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// Function for defining a base particle for dE/dx calculation.
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// (no base particle by default). Returns atomic number of base
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// particle.
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G4int AtomicNumberBaseIon(
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G4int atomicNumberIon, // Atomic number of ion
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const G4Material*) override; // Target material
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private:
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void UpdateCacheParticle(
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const G4ParticleDefinition* particle); // Projectile (ion)
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void UpdateCacheMaterial(
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const G4Material* material); // Target material
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void CreateReferenceParticles();
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G4double EquilibriumCharge(
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G4double mass, // Ion mass
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G4double charge, // Ion charge
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G4double atomicNumberPow, // Power of atomic nmb
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G4double kineticEnergy); // Kinetic energy
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// Scaling is only applied for ions with atomic numbers in the range
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// defined by the following parameters:
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G4int minAtomicNumber;
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G4int maxAtomicNumber;
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G4bool referencePrepared;
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// Some properties of reference particle (Fe) are stored for faster access
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///////////////////////////G4ParticleDefinition* referenceFe;
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G4int atomicNumberRefFe;
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G4int massNumberRefFe;
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G4double atomicNumberRefPow23Fe;
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G4double chargeRefFe;
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G4double massRefFe;
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// Some properties of reference particle (Ar) are stored for faster access
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///////////////////////////G4ParticleDefinition* referenceAr;
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G4int atomicNumberRefAr;
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G4int massNumberRefAr;
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G4double atomicNumberRefPow23Ar;
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G4double chargeRefAr;
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G4double massRefAr;
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// Flag indicating the use of Fe ions as reference particles
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G4bool useFe;
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// Some properties of projectiles are stored for faster access
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const G4ParticleDefinition* cacheParticle;
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G4int cacheMassNumber;
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G4int cacheAtomicNumber;
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G4double cacheAtomicNumberPow23;
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G4double cacheCharge;
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G4double cacheMass;
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// Material pointer
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const G4Material* cacheMaterial;
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};
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// ###########################################################################
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inline void G4IonDEDXScalingICRU73::UpdateCacheParticle (
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const G4ParticleDefinition* particle) { // Projectile (ion)
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if(particle != cacheParticle) {
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cacheParticle = particle;
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cacheAtomicNumber = particle -> GetAtomicNumber();
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cacheMassNumber = particle -> GetAtomicMass();
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cacheCharge = particle -> GetPDGCharge();
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cacheMass = particle -> GetPDGMass();
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cacheAtomicNumberPow23 = std::pow(G4double(cacheAtomicNumber), 2./3.);
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}
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}
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// ###########################################################################
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inline void G4IonDEDXScalingICRU73::UpdateCacheMaterial (
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const G4Material* material) { // Target material
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if(cacheMaterial != material) {
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cacheMaterial = material;
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useFe = true;
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size_t nmbElements = material -> GetNumberOfElements();
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if( nmbElements > 1 ) useFe = false;
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if( material -> GetName() == "G4_WATER" ) useFe = true;
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}
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}
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// ###########################################################################
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inline G4double G4IonDEDXScalingICRU73::EquilibriumCharge(
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G4double mass,
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G4double charge,
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G4double atomicNumberPow,
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G4double kineticEnergy) {
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G4double totalEnergy = kineticEnergy + mass;
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G4double betaSquared = kineticEnergy *
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(totalEnergy + mass) / (totalEnergy * totalEnergy);
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G4double beta = std::sqrt( betaSquared );
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G4double velOverBohrVel = beta / CLHEP::fine_structure_const;
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G4double q1 = 1.0 - G4Exp(-velOverBohrVel / atomicNumberPow);
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return q1 * charge;
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}
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// ###########################################################################
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#endif
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