R3BNeutronWindowAndSomeAir.h

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/******************************************************************************
 *   Copyright (C) 2020 GSI Helmholtzzentrum für Schwerionenforschung GmbH    *
 *   Copyright (C) 2020-2026 Members of R3B Collaboration                     *
 *                                                                            *
 *             This software is distributed under the terms of the            *
 *                 GNU General Public Licence (GPL) version 3,                *
 *                    copied verbatim in the file "LICENSE".                  *
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 * In applying this license GSI does not waive the privileges and immunities  *
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#pragma once
 
/* Place a neutron window (4mm steel) at xstart and air between start and stop
 * This can be used for NeuLAND simulations as there is currently no vacuum chamber implemented.
 * Instead, invert the problem: Use vacuum in the Cave and place a bunch o' air. Presto!
 * Bonus: No need to adjust the magnetic field for different beam energies.
 * The heavy ion will always fly through vacuum, and the neutrons through the right amount of material
 */
 
#include <FairModule.h>
 
class TGeoMedium;
 
class R3BNeutronWindowAndSomeAir : public FairModule
{
  public:
    explicit R3BNeutronWindowAndSomeAir(double start = 700, double stop = 1300);
 
    void ConstructGeometry() override { ConstructRootGeometry(); }
    void ConstructRootGeometry(TGeoMatrix* _ = nullptr) override;
 
  private:
    TGeoMedium* FindMaterial(const std::string& mat) const;
 
    double fStart;
    double fStop;
 
  public:
    ClassDefOverride(R3BNeutronWindowAndSomeAir, 1); // NOLINT
};