Import Geant4 11.4.0.beta source tree

2025-06-26 09:17:29 +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.          *
+// ********************************************************************
+//
+// G4VSIntegration
+//
+// Class description:
+//
+// Numerical algorithm for integration of probability density function
+// and sampling of the energy. Parameters of the algorithm should
+// be defined by consumer class via the InitialiseIntegrator(..) method.
+// The method is effective for the case of functions with a peak and long
+// tail. Tunning of parameters may increase efficiency of the algorithm.
+// The default set of parameters is optimized for the pre-compound model.
+//
+// Created 03.03.2025 V.Ivanchenko
+//
+// --------------------------------------------------------------------
+
+#ifndef G4VSIntegration_HH
+#define G4VSIntegration_HH 1
+
+#include "globals.hh"
+
+class G4VSIntegration
+{
+ public:
+  G4VSIntegration() = default;
+
+  virtual ~G4VSIntegration() = default;
+
+  // this method should be implemented in a consumer class
+  virtual G4double ProbabilityDensityFunction(G4double) = 0;
+
+  virtual const G4String& ModelName() const;
+
+  // initialisation before run called once
+  // accuracy - accuracy of integration
+  // fact1 - value < 1 to define energy E1: Pmax*fact = P(E1)
+  //         and E2: P(E1)*fact = P(E2)
+  // fact2 - value > 1 provides tolerance for max cross section
+  // deltaE - the default step in energy
+  // dmin, dmax - min and max values of step
+  void InitialiseIntegrator(G4double accuracy, G4double fact1, G4double fact2,
+			    G4double de, G4double dmin, G4double dmax);
+
+  // compute integral of probability density function
+  G4double ComputeIntegral(const G4double emin, const G4double  emax);
+
+  // sample value according to probability density function
+  // it is assumed that ComputeIntegral(emin, emax) was executed 
+  G4double SampleValue();
+
+  G4VSIntegration(const G4VSIntegration&) = delete;
+  G4VSIntegration& operator=(const G4VSIntegration&) = delete;
+  G4bool operator==(const G4VSIntegration &right) const = delete;
+  G4bool operator!=(const G4VSIntegration &right) const = delete;
+
+  void SetVerbose(G4int verb) { fVerbose = verb; }
+
+private:
+
+  G4double fAcc{0.001};    // accuracy of integration
+  G4double fMinDelta{0.1}; // minimal step integration
+  G4double fMaxDelta{2.0}; // maximal step integration
+  G4double fDelta{1.0};    // the default step
+  G4double fFactor1{0.25};
+  G4double fFactor2{1.05};
+
+  // parameters describing function
+  G4double fEmin{0.0};
+  G4double fEmax{0.0};
+  G4double fE1{0.0};
+  G4double fP1{0.0};
+  G4double fE2{0.0}; 
+  G4double fP2{0.0};
+  G4double fPmax{0.0};
+
+  G4int fVerbose{0};
+  G4int fWarnLimit{4};
+  G4int fnWarn{0};
+
+  G4String dummy{""};
+};
+
+#endif