TRestAxionField.h

/*************************************************************************
 * This file is part of the REST software framework.                     *
 *                                                                       *
 * Copyright (C) 2016 GIFNA/TREX (University of Zaragoza)                *
 * For more information see http://gifna.unizar.es/trex                  *
 *                                                                       *
 * REST is free software: you can redistribute it and/or modify          *
 * it under the terms of the GNU General Public License as published by  *
 * the Free Software Foundation, either version 3 of the License, or     *
 * (at your option) any later version.                                   *
 *                                                                       *
 * REST is distributed in the hope that it will be useful,               *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the          *
 * GNU General Public License for more details.                          *
 *                                                                       *
 * You should have a copy of the GNU General Public License along with   *
 * REST in $REST_PATH/LICENSE.                                           *
 * If not, see http://www.gnu.org/licenses/.                             *
 * For the list of contributors see $REST_PATH/CREDITS.                  *
 *************************************************************************/
 
#ifndef _TRestAxionField
#define _TRestAxionField
 
#include "TRestAxionBufferGas.h"
#include "TRestAxionMagneticField.h"
 
class TRestAxionField : public TObject {
   private:
    Bool_t fDebug = false;  
 
    Double_t fBmag = 2.5;
 
    Double_t fLcoh = 10000;
 
    Double_t fEa = 4.2;
 
    void Initialize();
 
    TRestAxionBufferGas* fBufferGas = nullptr;  
 
    TRestAxionMagneticField* fMagneticField = nullptr;  
 
    std::pair<Double_t, Double_t> ComputeOffResonanceIntegral(Double_t q, Double_t Gamma, Double_t accuracy,
                                                              Int_t num_intervals, Int_t qawo_levels);
 
    std::pair<Double_t, Double_t> ComputeResonanceIntegral(Double_t Gamma, Double_t accuracy,
                                                           Int_t num_intervals);
 
   public:
    void SetMagneticField(Double_t b) { fBmag = b; }
    void SetCoherenceLength(Double_t l) { fLcoh = l; }
    void SetAxionEnergy(Double_t e) { fEa = e; }
 
    Double_t GetMagneticField() const { return fBmag; }
    Double_t GetCoherenceLength() const { return fLcoh; }
    Double_t GetAxionEnergy() const { return fEa; }
 
    Double_t BL(Double_t Bmag, Double_t Lcoh);
    Double_t BLHalfSquared(Double_t Bmag, Double_t Lcoh);
 
    void SetDebug(Bool_t v) { fDebug = v; }
 
    void AssignBufferGas(TRestAxionBufferGas* buffGas) { fBufferGas = buffGas; }
 
    void AssignMagneticField(TRestAxionMagneticField* mField) { fMagneticField = mField; }
 
    void SetBufferGas(TRestAxionBufferGas* buffGas) { fBufferGas = buffGas; }
 
    Double_t GammaTransmissionProbability(Double_t Ea, Double_t ma, Double_t mg = 0, Double_t absLength = 0);
 
    Double_t GammaTransmissionProbability(Double_t Bmag, Double_t Lcoh, Double_t Ea, Double_t ma,
                                          Double_t mg = 0, Double_t absLength = 0);
 
    Double_t AxionAbsorptionProbability(Double_t ma, Double_t mg = 0, Double_t absLength = 0);
 
    Double_t AxionAbsorptionProbability(Double_t Bmag, Double_t Lcoh, Double_t Ea, Double_t ma,
                                        Double_t mg = 0, Double_t absLength = 0);
 
    Double_t GammaTransmissionProbability(std::vector<Double_t> Bmag, Double_t deltaL, Double_t Ea,
                                          Double_t ma, Double_t mg = 0, Double_t absLength = 0);
 
    std::pair<Double_t, Double_t> GammaTransmissionFieldMapProbability(Double_t Ea, Double_t ma,
                                                                       Double_t accuracy = 1.e-1,
                                                                       Int_t num_intervals = 100,
                                                                       Int_t qawo_levels = 20);
 
    static double Integrand(double x, void* params) {
        auto* data = reinterpret_cast<std::pair<TRestAxionMagneticField*, double>*>(params);
 
        TRestAxionMagneticField* field = data->first;
        double gamma = data->second;
 
        return exp(0.5 * gamma * x) * field->GetTransversalComponentInParametricTrack(x);
    }
 
    Double_t GammaTransmissionFWHM(Double_t step = 0.00001);
 
    std::vector<std::pair<Double_t, Double_t>> GetMassDensityScanning(std::string gasName = "He",
                                                                      Double_t maMax = 0.15,
                                                                      Double_t rampDown = 5.0);
 
    TRestAxionField();
    ~TRestAxionField();
 
    ClassDef(TRestAxionField, 2);
};
#endif