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// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.

// All rights not expressly granted are reserved.

//

// This software is distributed under the terms of the GNU General Public

// License v3 (GPL Version 3), copied verbatim in the file "COPYING".

//

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/// \file ParameterGas.h

/// \brief Definition of the parameter class for the detector gas

/// \author Andi Mathis, TU München, andreas.mathis@ph.tum.de

#ifndef ALICEO2_TPC_ParameterGas_H_

#define ALICEO2_TPC_ParameterGas_H_

#include <array>

#include "CommonUtils/ConfigurableParam.h"

#include "CommonUtils/ConfigurableParamHelper.h"

namespace o2

{

namespace tpc

{

struct ParameterGas : public o2::conf::ConfigurableParamHelper<ParameterGas> {

float Wion = 37.3e-9f; ///< Effective ionization potential [GeV]

float Ipot = 20.77e-9f; ///< First ionization potential [GeV]

float Eend = 1e-5f; ///< Maximum allowed energy loss [GeV]

float Exp = 2.2f; ///< Exponent of the energy loss

float AttCoeff = 250.f; ///< Attachement coefficient [1/m]

float OxygenCont = 5.e-6f; ///< Oxygen content [1E6 ppm]

float DriftV = 2.58f; ///< Drift velocity [cm/us]

float SigmaOverMu = 0.78f; ///< Sigma over mu, gives deviation from exponential gain fluctuations

float DiffT = 0.0209f; ///< Transverse diffusion [sqrt(cm)]

float DiffL = 0.0221f; ///< Longitudinal diffusion [sqrt(cm)]

float Nprim = 14.f; ///< Number of primary electrons per MIP and cm [1/cm]

float ScaleFactorG4 = 0.85f; ///< Scale factor to tune WION for GEANT4

float FanoFactorG4 = 0.7f; ///< Parameter for smearing the number of ionizations (nel) using GEANT4

float Pressure = 1013.25f; ///< Pressure [mbar]

float Temperature = 20.0f; ///< Temperature [°C]

float BetheBlochParam[5] = {0.820172e-1f, 9.94795f, 8.97292e-05f, 2.05873f, 1.65272f}; ///< Parametrization of Bethe-Bloch

O2ParamDef(ParameterGas, "TPCGasParam");

};

} // namespace tpc

namespace framework

{

template <typename T>

struct is_messageable;

template <>

struct is_messageable<o2::tpc::ParameterGas> : std::true_type {

};

} // namespace framework

} // namespace o2

#endif // ALICEO2_TPC_ParameterGas_H_