Import Geant4 9.5.0 source tree

2016-06-09 16:46:55 +02:00
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+//
+// ********************************************************************
+// * License and Disclaimer                                           *
+// *                                                                  *
+// * The  Geant4 software  is  copyright of the Copyright Holders  of *
+// * the Geant4 Collaboration.  It is provided  under  the terms  and *
+// * conditions of the Geant4 Software License,  included in the file *
+// * LICENSE and available at  http://cern.ch/geant4/license .  These *
+// * include a list of copyright holders.                             *
+// *                                                                  *
+// * Neither the authors of this software system, nor their employing *
+// * institutes,nor the agencies providing financial support for this *
+// * work  make  any representation or  warranty, express or implied, *
+// * regarding  this  software system or assume any liability for its *
+// * use.  Please see the license in the file  LICENSE  and URL above *
+// * for the full disclaimer and the limitation of liability.         *
+// *                                                                  *
+// * This  code  implementation is the result of  the  scientific and *
+// * technical work of the GEANT4 collaboration.                      *
+// * By using,  copying,  modifying or  distributing the software (or *
+// * any work based  on the software)  you  agree  to acknowledge its *
+// * use  in  resulting  scientific  publications,  and indicate your *
+// * acceptance of all terms of the Geant4 Software license.          *
+// ********************************************************************
+//
+// $Id: G4DipBustGenerator.cc,v 1.1 2010-10-14 15:17:48 vnivanch Exp $
+// GEANT4 tag $Name: not supported by cvs2svn $
+//
+// -------------------------------------------------------------------
+//
+// GEANT4 Class file
+//
+//
+// File name:     G4DipBustGenerator
+//
+// Author:  Vladimir Grichine     
+// 
+// Creation date: 17 May 2011
+//
+// Modifications: 
+// 
+//
+// Class Description: 
+//
+// Bremsstrahlung Angular Distribution Generation 
+// suggested  the dipole approximation in the rest frame of electron 
+// busted in the laboratory frame.
+//
+// Class Description: End 
+//
+// -------------------------------------------------------------------
+//
+
+#include "G4DipBustGenerator.hh"
+#include "Randomize.hh"
+
+G4DipBustGenerator::G4DipBustGenerator(const G4String&)
+  : G4VBremAngularDistribution("AngularGenUrban")
+{}    
+
+G4DipBustGenerator::~G4DipBustGenerator() 
+{}
+
+G4double G4DipBustGenerator::PolarAngle(const G4double eTkin,
+				    const G4double, // final_energy
+				    const G4int ) // Z
+{
+  G4double c, cosTheta, delta, cofA, signc = 1., a, power = 1./3.;
+  G4double gamma, beta, theta;
+
+  c = 4. - 8.*G4UniformRand();
+  a = c;
+ 
+  if( c < 0. )
+  {
+    signc = -1.;
+    a     = -c;
+  }
+  delta  = std::sqrt(a*a+4.);
+  delta += a;
+  delta *= 0.5; 
+
+  cofA = -signc*std::pow(delta, power);
+
+  cosTheta = cofA - 1./cofA;
+
+  gamma = 1. + eTkin/electron_mass_c2;
+  beta = std::sqrt(1. - 1./gamma/gamma);
+
+  cosTheta = (cosTheta + beta)/(1 + cosTheta*beta);
+
+  theta = std::acos(cosTheta);
+
+  if( theta < 0. )  theta = 0.;
+  if( theta > pi )  theta = pi;
+  // G4cout <<"theta = "<<theta<<"; ";
+
+  return theta;
+}
+
+void G4DipBustGenerator::PrintGeneratorInformation() const
+{
+  G4cout << "\n" << G4endl;
+  G4cout << "Bremsstrahlung Angular Generator is Modified Tsai" << G4endl;
+  G4cout << "Distribution suggested by L.Urban (Geant3 manual (1993) Phys211)" 
+	 << G4endl;
+  G4cout << "Derived from Tsai distribution (Rev Mod Phys 49,421(1977)) \n" 
+	 << G4endl;
+}