Import Geant4 4.1.0 source tree

2016-06-08 16:39:52 +02:00
parent 921d3b1cda
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+//
+// ********************************************************************
+// * DISCLAIMER                                                       *
+// *                                                                  *
+// * The following disclaimer summarizes all the specific disclaimers *
+// * of contributors to this software. The specific disclaimers,which *
+// * govern, are listed with their locations in:                      *
+// *   http://cern.ch/geant4/license                                  *
+// *                                                                  *
+// * 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.                                                             *
+// *                                                                  *
+// * This  code  implementation is the  intellectual property  of the *
+// * GEANT4 collaboration.                                            *
+// * By copying,  distributing  or modifying the Program (or any work *
+// * based  on  the Program)  you indicate  your  acceptance of  this *
+// * statement, and all its terms.                                    *
+// ********************************************************************
+//
+//
+// $Id: G4WeightWindowAlgorithm.cc,v 1.2 2002/05/31 09:56:09 dressel Exp $
+// GEANT4 tag $Name: geant4-04-01 $
+//
+// ----------------------------------------------------------------------
+// GEANT 4 class source file
+//
+// G4WeightWindowAlgorithm.cc
+//
+// ----------------------------------------------------------------------
+#include "G4WeightWindowAlgorithm.hh"
+#include "Randomize.hh"
+
+
+G4WeightWindowAlgorithm::G4WeightWindowAlgorithm() :
+  fUpper(1),
+  fLower(1)
+{}
+
+void G4WeightWindowAlgorithm::SetUpperLimit(G4double Upper){
+  fUpper = Upper;
+}
+  
+void G4WeightWindowAlgorithm::SetLowerLimit(G4double Lower){
+  fLower = Lower;
+}
+
+
+G4Nsplit_Weight 
+G4WeightWindowAlgorithm::Calculate(G4double init_w, 
+				   G4double importance) const {
+
+
+  G4Nsplit_Weight nw(1, init_w);
+  G4double iw =  importance * init_w;
+  if (iw>fUpper) {
+    // f is the factor by which the weight is greater 
+    // than allowed by fUpper
+    // it is almost the number of coppies to be produced
+    G4double f = iw / fUpper;
+    // calculate new weight
+    nw.fW/=f; 
+
+    // calculate the number of coppies
+    nw.fN = int(f);
+    // correct the number of coppies in case f is not an integer
+    if (G4double(nw.fN) != f) {
+      // probabillity p for splitting into nw.fN+1 particles
+      G4double p = f - nw.fN;
+      // get a random number out of [0,1)
+      G4double r = G4UniformRand();
+      if (r<p) {
+	nw.fN++;
+      } 
+    }
+
+  }
+  else if (iw < fLower) {
+    // play russian roulett
+    G4double p = iw / fLower; // survival prob.
+    G4double r = G4UniformRand();
+    if (r>=p) {
+      // kill track
+      nw.fN = 0;
+      nw.fW = 0;
+    } 
+    else {
+      nw.fW*=1/p; // to be consistant with the survival prob.
+    }      
+  }
+  return nw;
+}
+