/*
* (c) Copyright 2020 CORSIKA Project, corsika-project@lists.kit.edu
*
* This software is distributed under the terms of the GNU General Public
* Licence version 3 (GPL Version 3). See file LICENSE for a full version of
* the license.
*/
#include <corsika/cascade/Cascade.h>
#include <corsika/environment/Environment.h>
#include <corsika/environment/LayeredSphericalAtmosphereBuilder.h>
#include <corsika/environment/NuclearComposition.h>
#include <corsika/environment/ShowerAxis.h>
#include <corsika/geometry/Plane.h>
#include <corsika/geometry/Sphere.h>
#include <corsika/process/ProcessSequence.h>
#include <corsika/process/StackProcess.h>
#include <corsika/process/longitudinal_profile/LongitudinalProfile.h>
#include <corsika/process/observation_plane/ObservationPlane.h>
#include <corsika/process/particle_cut/ParticleCut.h>
#include <corsika/process/proposal/ContinuousProcess.h>
#include <corsika/process/proposal/Interaction.h>
#include <corsika/process/track_writer/TrackWriter.h>
#include <corsika/process/tracking_line/TrackingLine.h>
#include <corsika/random/RNGManager.h>
#include <corsika/setup/SetupStack.h>
#include <corsika/setup/SetupTrajectory.h>
#include <corsika/units/PhysicalUnits.h>
#include <corsika/utl/CorsikaFenv.h>
#include <corsika/process/interaction_counter/InteractionCounter.hpp>
#include <corsika/logging/Logging.h>
#include <iomanip>
#include <iostream>
#include <limits>
#include <string>
#include <typeinfo>
using namespace corsika;
using namespace corsika::process;
using namespace corsika::units;
using namespace corsika::particles;
using namespace corsika::random;
using namespace corsika::geometry;
using namespace corsika::environment;
using namespace std;
using namespace corsika::units::si;
void registerRandomStreams() {
random::RNGManager::GetInstance().RegisterRandomStream("cascade");
random::RNGManager::GetInstance().RegisterRandomStream("proposal");
random::RNGManager::GetInstance().SeedAll();
}
template <typename T>
using MyExtraEnv = environment::MediumPropertyModel<environment::UniformMagneticField<T>>;
int main(int argc, char** argv) {
logging::SetLevel(logging::level::info);
if (argc != 2) {
std::cerr << "usage: em_shower <energy/GeV>" << std::endl;
return 1;
}
feenableexcept(FE_INVALID);
// initialize random number sequence(s)
registerRandomStreams();
// setup environment, geometry
using EnvType = setup::Environment;
EnvType env;
const CoordinateSystem& rootCS = env.GetCoordinateSystem();
Point const center{rootCS, 0_m, 0_m, 0_m};
auto builder = environment::make_layered_spherical_atmosphere_builder<
setup::EnvironmentInterface,
MyExtraEnv>::create(center, units::constants::EarthRadius::Mean,
environment::Medium::AirDry1Atm,
geometry::Vector{rootCS, 0_T, 0_T, 1_T});
builder.setNuclearComposition(
{{particles::Code::Nitrogen, particles::Code::Oxygen},
{0.7847f, 1.f - 0.7847f}}); // values taken from AIRES manual, Ar removed for now
builder.addExponentialLayer(1222.6562_g / (1_cm * 1_cm), 994186.38_cm, 4_km);
builder.addExponentialLayer(1144.9069_g / (1_cm * 1_cm), 878153.55_cm, 10_km);
builder.addExponentialLayer(1305.5948_g / (1_cm * 1_cm), 636143.04_cm, 40_km);
builder.addExponentialLayer(540.1778_g / (1_cm * 1_cm), 772170.16_cm, 100_km);
builder.addLinearLayer(1e9_cm, 112.8_km);
builder.assemble(env);
// setup particle stack, and add primary particle
setup::Stack stack;
stack.Clear();
const Code beamCode = Code::Electron;
auto const mass = particles::GetMass(beamCode);
const HEPEnergyType E0 = 1_GeV * std::stof(std::string(argv[1]));
double theta = 0.;
auto const thetaRad = theta / 180. * M_PI;
auto elab2plab = [](HEPEnergyType Elab, HEPMassType m) {
return sqrt((Elab - m) * (Elab + m));
};
HEPMomentumType P0 = elab2plab(E0, mass);
auto momentumComponents = [](double thetaRad, HEPMomentumType ptot) {
return std::make_tuple(ptot * sin(thetaRad), 0_eV, -ptot * cos(thetaRad));
};
auto const [px, py, pz] = momentumComponents(thetaRad, P0);
auto plab = corsika::stack::MomentumVector(rootCS, {px, py, pz});
cout << "input particle: " << beamCode << endl;
cout << "input angles: theta=" << theta << endl;
cout << "input momentum: " << plab.GetComponents() / 1_GeV << ", norm = " << plab.norm()
<< endl;
auto const observationHeight = 1.4_km + builder.getEarthRadius();
auto const injectionHeight = 112.75_km + builder.getEarthRadius();
auto const t = -observationHeight * cos(thetaRad) +
sqrt(-static_pow<2>(sin(thetaRad) * observationHeight) +
static_pow<2>(injectionHeight));
Point const showerCore{rootCS, 0_m, 0_m, observationHeight};
Point const injectionPos =
showerCore +
Vector<dimensionless_d>{rootCS, {-sin(thetaRad), 0, cos(thetaRad)}} * t;
std::cout << "point of injection: " << injectionPos.GetCoordinates() << std::endl;
stack.AddParticle(
std::tuple<particles::Code, units::si::HEPEnergyType,
corsika::stack::MomentumVector, geometry::Point, units::si::TimeType>{
beamCode, E0, plab, injectionPos, 0_ns});
std::cout << "shower axis length: " << (showerCore - injectionPos).norm() * 1.02
<< std::endl;
environment::ShowerAxis const showerAxis{injectionPos,
(showerCore - injectionPos) * 1.02, env};
// setup processes, decays and interactions
// PROPOSAL processs proposal{...};
process::particle_cut::ParticleCut cut(10_GeV, false, true);
process::proposal::Interaction proposal(env, cut.GetECut());
process::proposal::ContinuousProcess em_continuous(env, cut.GetECut());
process::interaction_counter::InteractionCounter proposalCounted(proposal);
process::track_writer::TrackWriter trackWriter("tracks.dat");
// long. profile; columns for gamma, e+, e- still need to be added
process::longitudinal_profile::LongitudinalProfile longprof{showerAxis};
Plane const obsPlane(showerCore, Vector<dimensionless_d>(rootCS, {0., 0., 1.}));
process::observation_plane::ObservationPlane observationLevel(obsPlane,
"particles.dat");
auto sequence = process::sequence(proposalCounted, em_continuous, longprof, cut,
observationLevel, trackWriter);
// define air shower object, run simulation
tracking_line::TrackingLine tracking;
cascade::Cascade EAS(env, tracking, sequence, stack);
// to fix the point of first interaction, uncomment the following two lines:
// EAS.SetNodes();
// EAS.forceInteraction();
EAS.Run();
cut.ShowResults();
em_continuous.showResults();
observationLevel.ShowResults();
const HEPEnergyType Efinal = cut.GetCutEnergy() + cut.GetInvEnergy() +
cut.GetEmEnergy() + em_continuous.energyLost() +
observationLevel.GetEnergyGround();
cout << "total cut energy (GeV): " << Efinal / 1_GeV << endl
<< "relative difference (%): " << (Efinal / E0 - 1) * 100 << endl;
observationLevel.Reset();
cut.Reset();
em_continuous.reset();
auto const hists = proposalCounted.GetHistogram();
hists.saveLab("inthist_lab_emShower.npz");
hists.saveCMS("inthist_cms_emShower.npz");
longprof.save("longprof_emShower.txt");
}