Gabriele Cosmo
123 lines
4.5 KiB
Plaintext
123 lines
4.5 KiB
Plaintext
//
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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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// Authors: Lucio Santi, Rodrigo Castro (Univ. Buenos Aires), 2018-2021
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// --------------------------------------------------------------------
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template <class T>
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G4QSSDriver<T>::G4QSSDriver(T* pStepper) : G4InterpolationDriver<T, true>(0, pStepper)
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{
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// TODO: Remove additional stepper instances - should be a separate Driver class
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this->fSteppers.resize(1);
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}
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template <class T>
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void G4QSSDriver<T>::OnStartTracking()
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{
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Base::OnStartTracking();
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if (! initializedOnFirstRun)
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{
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G4double dqRel = G4QSSMessenger::instance()->Get_dQRel();
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G4double dQMin = G4QSSMessenger::instance()->Get_dQMin();
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if (dqRel == 0) { dqRel = 0.001; }
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if (dQMin == 0) { dQMin = 0.0001; }
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this->SetPrecision(dqRel, dQMin);
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initializedOnFirstRun = true;
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}
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}
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template <class T>
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void G4QSSDriver<T>::OnComputeStep(const G4FieldTrack* track)
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{
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Base::OnComputeStep(track);
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}
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template <class T>
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void G4QSSDriver<T>::SetPrecision(G4double dq_rel, G4double dq_min)
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{
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G4cout << "Setting QSS precision parameters: "
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<< "dQRel = " << dq_rel << " - "
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<< "dQMin = " << dq_min << G4endl;
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for (const auto& item : this->fSteppers)
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{
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item.stepper->SetPrecision(dq_rel, dq_min);
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}
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}
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template <class T>
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G4double G4QSSDriver<T>::AdvanceChordLimited(
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G4FieldTrack& track, G4double hstep, G4double epsStep, G4double chordDistance)
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{
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// For now, just extract functionality that we don't use from G4InterpolationDriver
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// We should probably end up making a custom G4QSSDriver separated from it
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++this->fTotalStepsForTrack;
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this->fLastStepper = this->fSteppers.begin();
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const G4double preCurveLength = track.GetCurveLength();
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G4double postCurveLength = preCurveLength;
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auto it = this->fSteppers.begin();
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it->stepper->reset(const_cast<const G4FieldTrack*>(&track));
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field_utils::State yBegin, y;
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track.DumpToArray(yBegin);
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track.DumpToArray(y);
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G4double hdid = OneGoodStep(it, y, this->fdydx, hstep, epsStep, preCurveLength, &track);
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postCurveLength += hdid;
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G4double dChordStep = this->DistChord(yBegin, preCurveLength, y, postCurveLength);
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// update chord step estimate
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hdid = this->FindNextChord(
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yBegin, preCurveLength, y, postCurveLength, dChordStep, chordDistance);
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track.LoadFromArray(y, this->fSteppers[0].stepper->GetNumberOfVariables());
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track.SetCurveLength(preCurveLength + hdid);
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return hdid;
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}
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template <class T>
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G4double G4QSSDriver<T>::OneGoodStep(typename G4InterpolationDriver<T, true>::StepperIterator it,
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field_utils::State& y, field_utils::State& dydx, G4double& hstep, G4double /*epsStep*/,
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G4double curveLength, G4FieldTrack* /*track*/)
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{
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G4double yerr[G4FieldTrack::ncompSVEC], ytemp[G4FieldTrack::ncompSVEC];
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it->stepper->Stepper(y, dydx, hstep, ytemp, yerr);
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G4double h = it->stepper->GetLastStepLength();
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// set interpolation interval
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it->begin = curveLength;
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it->end = curveLength + h;
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it->inverseLength = 1. / h;
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field_utils::copy(y, ytemp);
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return h;
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}
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