Gabriele Cosmo
100 lines
3.4 KiB
C++
100 lines
3.4 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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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. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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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 file
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//
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//
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// File name: G4ModifiedTsai
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//
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// Author: Andreia Trindade (andreia@lip.pt)
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// Pedro Rodrigues (psilva@lip.pt)
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// Luis Peralta (luis@lip.pt)
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//
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// Creation date: 21 March 2003
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//
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// Modifications:
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// 21 Mar 2003 A. Trindade First implementation acording with new design
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// 24 Mar 2003 & Fix in Tsai generator in order to prevent theta generation above pi
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//
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// Class Description:
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//
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// Concrete base class for Bremsstrahlung Angular Distribution Generation - Tsai Model
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//
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// Class Description: End
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//
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// -------------------------------------------------------------------
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//
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//
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#include "G4ModifiedTsai.hh"
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#include "Randomize.hh"
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//
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G4ModifiedTsai::G4ModifiedTsai(const G4String& name):G4VBremAngularDistribution(name)
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{;}
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//
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G4ModifiedTsai::~G4ModifiedTsai()
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{;}
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//
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G4double G4ModifiedTsai::PolarAngle(const G4double initial_energy,
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const G4double, // final_energy
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const G4int ) // Z
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{
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// Sample gamma angle (Z - axis along the parent particle).
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// Universal distribution suggested by L. Urban (Geant3 manual (1993)
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// Phys211) derived from Tsai distribution (Rev Mod Phys 49,421(1977))
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G4double totalEnergy = initial_energy + electron_mass_c2;
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const G4double a1 = 0.625, a2 = 3.*a1, d = 27.;
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G4double u, theta = 0;
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do{
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u = - std::log(G4UniformRand()*G4UniformRand());
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if (9./(9.+d) > G4UniformRand()) u /= a1;
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else u /= a2;
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theta = u*electron_mass_c2/totalEnergy;
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}while(u > (totalEnergy*pi/electron_mass_c2));
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return theta;
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}
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//
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void G4ModifiedTsai::PrintGeneratorInformation() const
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{
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G4cout << "\n" << G4endl;
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G4cout << "Bremsstrahlung Angular Generator is Modified Tsai" << G4endl;
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G4cout << "Universal distribution suggested by L. Urban (Geant3 manual (1993) Phys211)" << G4endl;
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G4cout << "Derived from Tsai distribution (Rev Mod Phys 49,421(1977)) \n" << G4endl;
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}
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