Gabriele Cosmo
313 lines
8.6 KiB
C++
313 lines
8.6 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: G4eBremsstrahlungSpectrum.cc,v 1.15 2006/06/29 19:41:58 gunter Exp $
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// GEANT4 tag $Name: geant4-08-01 $
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//
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// -------------------------------------------------------------------
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//
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// GEANT4 Class file
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//
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//
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// File name: G4eBremsstrahlungSpectrum
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//
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// Author: V.Ivanchenko (Vladimir.Ivanchenko@cern.ch)
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//
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// Creation date: 29 September 2001
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//
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// Modifications:
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// 10.10.01 MGP Revision to improve code quality and consistency with design
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// 15.11.01 VI Update spectrum model Bethe-Haitler spectrum at high energy
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// 30.05.02 VI Update interpolation between 2 last energy points in the
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// parametrisation
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// 21.02.03 V.Ivanchenko Energy bins are defined in the constructor
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// 28.02.03 V.Ivanchenko Filename is defined in the constructor
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//
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// -------------------------------------------------------------------
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#include "G4eBremsstrahlungSpectrum.hh"
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#include "G4BremsstrahlungParameters.hh"
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#include "Randomize.hh"
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G4eBremsstrahlungSpectrum::G4eBremsstrahlungSpectrum(const G4DataVector& bins,
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const G4String& name):G4VEnergySpectrum(),
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lowestE(0.1*eV),
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xp(bins)
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{
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length = xp.size();
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theBRparam = new G4BremsstrahlungParameters(name,length+1);
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verbose = 0;
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}
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G4eBremsstrahlungSpectrum::~G4eBremsstrahlungSpectrum()
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{
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delete theBRparam;
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}
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G4double G4eBremsstrahlungSpectrum::Probability(G4int Z,
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G4double tmin,
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G4double tmax,
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G4double e,
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G4int,
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const G4ParticleDefinition*) const
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{
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G4double tm = std::min(tmax, e);
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G4double t0 = std::max(tmin, lowestE);
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if(t0 >= tm) return 0.0;
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t0 /= e;
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tm /= e;
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G4double z0 = lowestE/e;
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G4DataVector p;
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// Access parameters
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for (size_t i=0; i<=length; i++) {
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p.push_back(theBRparam->Parameter(i, Z, e));
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}
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G4double x = IntSpectrum(t0, tm, p);
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G4double y = IntSpectrum(z0, 1.0, p);
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if(1 < verbose) {
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G4cout << "tcut(MeV)= " << tmin/MeV
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<< "; tMax(MeV)= " << tmax/MeV
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<< "; t0= " << t0
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<< "; tm= " << tm
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<< "; xp[0]= " << xp[0]
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<< "; z= " << z0
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<< "; val= " << x
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<< "; nor= " << y
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<< G4endl;
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}
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p.clear();
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if(y > 0.0) x /= y;
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else x = 0.0;
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// if(x < 0.0) x = 0.0;
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return x;
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}
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G4double G4eBremsstrahlungSpectrum::AverageEnergy(G4int Z,
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G4double tmin,
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G4double tmax,
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G4double e,
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G4int,
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const G4ParticleDefinition*) const
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{
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G4double tm = std::min(tmax, e);
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G4double t0 = std::max(tmin, lowestE);
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if(t0 >= tm) return 0.0;
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t0 /= e;
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tm /= e;
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G4double z0 = lowestE/e;
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G4DataVector p;
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// Access parameters
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for (size_t i=0; i<=length; i++) {
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p.push_back(theBRparam->Parameter(i, Z, e));
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}
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G4double x = AverageValue(t0, tm, p);
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G4double y = IntSpectrum(z0, 1.0, p);
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// Add integrant over lowest energies
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G4double zmin = tmin/e;
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if(zmin < t0) {
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G4double c = std::sqrt(theBRparam->ParameterC(Z));
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x += p[0]*(t0 - zmin - c*(std::atan(t0/c) - std::atan(zmin/c)));
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}
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x *= e;
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if(1 < verbose) {
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G4cout << "tcut(MeV)= " << tmin/MeV
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<< "; tMax(MeV)= " << tmax/MeV
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<< "; e(MeV)= " << e/MeV
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<< "; t0= " << t0
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<< "; tm= " << tm
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<< "; y= " << y
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<< "; x= " << x
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<< G4endl;
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}
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p.clear();
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if(y > 0.0) x /= y;
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else x = 0.0;
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// if(x < 0.0) x = 0.0;
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return x;
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}
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G4double G4eBremsstrahlungSpectrum::SampleEnergy(G4int Z,
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G4double tmin,
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G4double tmax,
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G4double e,
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G4int,
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const G4ParticleDefinition*) const
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{
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G4double tm = std::min(tmax, e);
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G4double t0 = std::max(tmin, lowestE);
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if(t0 >= tm) return 0.0;
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t0 /= e;
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tm /= e;
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G4DataVector p;
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for (size_t i=0; i<=length; i++) {
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p.push_back(theBRparam->Parameter(i, Z, e));
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}
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G4double amaj = std::max(p[length], 1. - (p[1] - p[0])*xp[0]/(xp[1] - xp[0]) );
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G4double amax = std::log(tm);
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G4double amin = std::log(t0);
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G4double tgam, q, fun;
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do {
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G4double x = amin + G4UniformRand()*(amax - amin);
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tgam = std::exp(x);
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fun = Function(tgam, p);
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if(fun > amaj) {
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G4cout << "WARNING in G4eBremsstrahlungSpectrum::SampleEnergy:"
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<< " Majoranta " << amaj
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<< " < " << fun
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<< G4endl;
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}
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q = amaj * G4UniformRand();
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} while (q > fun);
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tgam *= e;
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p.clear();
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return tgam;
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}
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G4double G4eBremsstrahlungSpectrum::IntSpectrum(G4double xMin,
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G4double xMax,
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const G4DataVector& p) const
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{
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G4double x1 = std::min(xMin, xp[0]);
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G4double x2 = std::min(xMax, xp[0]);
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G4double sum = 0.0;
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if(x1 < x2) {
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G4double k = (p[1] - p[0])/(xp[1] - xp[0]);
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sum += (1. - k*xp[0])*std::log(x2/x1) + k*(x2 - x1);
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}
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for (size_t i=0; i<length-1; i++) {
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x1 = std::max(xMin, xp[i]);
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x2 = std::min(xMax, xp[i+1]);
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if(x1 < x2) {
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G4double z1 = p[i];
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G4double z2 = p[i+1];
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sum += z2 - z1 + std::log(x2/x1)*(z1*x2 - z2*x1)/(x2 - x1);
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}
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}
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if(sum < 0.0) sum = 0.0;
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return sum;
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}
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G4double G4eBremsstrahlungSpectrum::AverageValue(G4double xMin,
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G4double xMax,
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const G4DataVector& p) const
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{
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G4double x1 = std::min(xMin, xp[0]);
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G4double x2 = std::min(xMax, xp[0]);
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G4double z1 = x1;
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G4double z2 = x2;
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G4double sum = 0.0;
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if(x1 < x2) {
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G4double k = (p[1] - p[0])/(xp[1] - xp[0]);
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sum += (z2 - z1)*(1. - k*xp[0]);
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z1 *= x1;
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z2 *= x2;
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sum += 0.5*k*(z2 - z1);
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}
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for (size_t i=0; i<length-1; i++) {
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x1 = std::max(xMin, xp[i]);
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x2 = std::min(xMax, xp[i+1]);
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if(x1 < x2) {
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z1 = p[i];
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z2 = p[i+1];
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sum += 0.5*(z2 - z1)*(x2 + x1) + z1*x2 - z2*x1;
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}
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}
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if(sum < 0.0) sum = 0.0;
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return sum;
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}
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G4double G4eBremsstrahlungSpectrum::Function(G4double x,
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const G4DataVector& p) const
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{
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G4double f = 0.0;
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if(x <= xp[0]) {
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f = p[0] + (p[1] - p[0])*(x - xp[0])/(xp[1] - xp[0]);
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} else {
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for (size_t i=0; i<length-1; i++) {
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if(x <= xp[i+1]) {
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f = p[i] + (p[i+1] - p[i])*(x - xp[i])/(xp[i+1] - xp[i]);
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break;
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}
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}
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}
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return f;
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}
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void G4eBremsstrahlungSpectrum::PrintData() const
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{ theBRparam->PrintData(); }
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G4double G4eBremsstrahlungSpectrum::Excitation(G4int , G4double ) const
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{
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return 0.0;
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}
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G4double G4eBremsstrahlungSpectrum::MaxEnergyOfSecondaries(G4double kineticEnergy,
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G4int, // Z,
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const G4ParticleDefinition*) const
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{
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return kineticEnergy;
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}
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