Gabriele Cosmo
125 lines
4.6 KiB
C++
125 lines
4.6 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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// G4VelocityTable
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//
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// Class description:
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//
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// This class keeps a table of velocity as a function of the ratio
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// kinetic erngy and mass. G4VelocityTable is used by
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// G4Track::CalculateVelocity().
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// Author: Hisaya Kurashige, 17 August 2011
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// --------------------------------------------------------------------
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#ifndef G4VelocityTable_hh
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#define G4VelocityTable_hh 1
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#include <vector>
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#include <iostream>
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#include "globals.hh"
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#include "G4ios.hh"
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#include "G4ThreadLocalSingleton.hh"
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class G4VelocityTable
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{
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friend class G4ThreadLocalSingleton<G4VelocityTable>;
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using G4VTDataVector = std::vector<G4double>;
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public:
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G4double Value(G4double theEnergy);
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// Get the cross-section/energy-loss value corresponding to the
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// given energy. An appropriate interpolation is used to calculate
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// the value
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static G4VelocityTable* GetVelocityTable();
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static void SetVelocityTableProperties(G4double t_max, G4double t_min,
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G4int nbin);
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static G4double GetMaxTOfVelocityTable();
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static G4double GetMinTOfVelocityTable();
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static G4int GetNbinOfVelocityTable();
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private:
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G4VelocityTable();
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~G4VelocityTable();
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void PrepareVelocityTable();
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std::size_t FindBinLocation(G4double theEnergy) const;
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// Find the bin# in which theEnergy belongs - pure virtual function
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inline G4double Interpolation() const;
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// --------------------------------------------------------------------
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G4double edgeMin = 0.0; // Energy of first point
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G4double edgeMax = 0.0; // Energy of the last point
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std::size_t numberOfNodes = 0;
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G4VTDataVector dataVector; // Vector to keep the crossection/energyloss
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G4VTDataVector binVector; // Vector to keep energy
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G4VTDataVector secDerivative; // Vector to keep second derivatives
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G4double dBin = 0.0; // Bin width - useful only for fixed binning
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G4double baseBin = 0.0; // Set this in constructor for performance
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G4double lastEnergy = -DBL_MAX; // Cache the last input value
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G4double lastValue = 0.0; // Cache the last output value
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std::size_t lastBin = 0; // Cache the last bin location
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static G4ThreadLocal G4VelocityTable* theInstance;
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G4double maxT = 1000.0;
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G4double minT = 0.0001;
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G4int NbinT = 500;
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};
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// ----------------------
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// Inline methods
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// ----------------------
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inline G4double G4VelocityTable::Interpolation() const
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{
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// Linear interpolation is used to get the value. If the give energy
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// is in the highest bin, no interpolation will be Done. Because
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// there is an extra bin hidden from a user at locBin=numberOfBin,
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// the following interpolation is valid even the current locBin=
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// numberOfBin-1.
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G4double intplFactor =
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(lastEnergy - binVector[lastBin]) /
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(binVector[lastBin + 1] - binVector[lastBin]); // Interpol. factor
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return dataVector[lastBin] +
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(dataVector[lastBin + 1] - dataVector[lastBin]) * intplFactor;
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}
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#endif
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