G4_Target.C

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using namespace std;

void SetupTarget(
  PHG4Reco *g4Reco,
  const bool do_collimator = true,
  const bool do_target = true,
  const double target_coil_pos_z = -130,
        const double target_l = 7.9,
        const double target_z = 0.,
        const int use_g4steps = 1
) {

  const double collimator_pos_z = target_coil_pos_z - 302.36;

  //gSystem->Load("libfun4all.so");
        //gSystem->Load("libg4detectors");
        //gSystem->Load("libg4testbench");

  //Fun4AllServer *se = Fun4AllServer::instance();
  //PHG4Reco *g4Reco = (PHG4Reco *) se->getSubsysReco("PHG4RECO");

  if(do_collimator) {
    PHG4CollimatorSubsystem* collimator = new PHG4CollimatorSubsystem("Collimator",0);
    collimator->SuperDetector("Collimator");
    collimator->set_double_param("place_z", collimator_pos_z);//-302.36 cm
    collimator->set_double_param("size_z",121.92);
    collimator->SetActive(1);
    g4Reco->registerSubsystem(collimator);
  }

  if(do_target) {
    PHG4TargetCoilSubsystem* coil_0 = new PHG4TargetCoilSubsystem("Coil", 0);
    coil_0->SuperDetector("Coil");
    coil_0->set_double_param("rot_x", 90.);
    coil_0->set_double_param("rot_y", 0.);
    coil_0->set_double_param("rot_z", 0.);
    coil_0->set_double_param("place_x", 0.);
    coil_0->set_double_param("place_y", (22.7+4.)/2);
    coil_0->set_double_param("place_z", target_coil_pos_z);
    coil_0->set_int_param("use_g4steps", use_g4steps);
    coil_0->SetActive(1);                                   // it is an active volume - save G4Hits
    g4Reco->registerSubsystem(coil_0);

    PHG4TargetCoilSubsystem* coil_1 = new PHG4TargetCoilSubsystem("Coil", 1);
    coil_1->SuperDetector("Coil");
    coil_1->set_double_param("rot_x", -90.);
    coil_1->set_double_param("rot_y", 0.);
    coil_1->set_double_param("rot_z", 0.);
    coil_1->set_double_param("place_x", 0.);
    coil_1->set_double_param("place_y", -(22.7+4.)/2);
    coil_1->set_double_param("place_z", target_coil_pos_z);
    coil_1->set_int_param("use_g4steps", use_g4steps);
    coil_1->SetActive(1);                                   // it is an active volume - save G4Hits
    g4Reco->registerSubsystem(coil_1);

    PHG4CylinderSubsystem* target = new PHG4CylinderSubsystem("Target", 0);
    target->SuperDetector("Target");
    target->set_double_param("length", target_l);
    target->set_double_param("rot_x", 0.);
    target->set_double_param("rot_y", 0.);
    target->set_double_param("rot_z", 0.);
    target->set_double_param("place_x", 0.);
    target->set_double_param("place_y", 0.);
    target->set_double_param("place_z", target_coil_pos_z + target_z);
    target->set_double_param("radius", 0.);
    target->set_double_param("thickness", (2.)/2);
    target->set_string_param("material", "Target");          // material of target
    target->set_int_param("lengthviarapidity", 0);
    target->set_int_param("use_g4steps", use_g4steps);
    target->SetActive(1);                                   // it is an active volume - save G4Hits
    g4Reco->registerSubsystem(target);
  }

  return;
}