EXPERT ROOT

void run(Int_t nEvents = 100, Float_t ekin = 0.01){

  //---------------------Files-----------------------------------------------

  TString outFile;

  outFile.Form("run%.4f.root", ekin);

  TString parFile;

  parFile.Form("par%.4f.root", ekin);

  // ------------------------------------------------------------------------

  // -----   Timer   --------------------------------------------------------

  TStopwatch timer;

  timer.Start();

  // ------------------------------------------------------------------------

  // -----   Create simulation run   ----------------------------------------

  FairRunSim* run = new FairRunSim();

  /** Select transport engine

  * TGeant3

  * TGeant4

  **/

  run->SetName("TGeant4");              // Transport engine

  run->SetOutputFile(outFile.Data());          // Output file

  // ------------------------------------------------------------------------

  // -----   Runtime database   ---------------------------------------------

  FairRuntimeDb* rtdb = run->GetRuntimeDb();

  // ------------------------------------------------------------------------

  // -----   Create media   -------------------------------------------------

  run->SetMaterials("media.geo");       // Materials

  // ------------------------------------------------------------------------

  // -----   Create detectors  ----------------------------------------------        

  FairModule* cave= new ERCave("CAVE");

  cave->SetGeometryFileName("cave.geo");

  run->AddModule(cave);

  // ER NeuRad definition

  /* Select verbosity level

   * 1 - only standard logs

   * 2 - Print points after each event

   * 3 - - GEANT Step information

  */

  Int_t verbose = 1;

  ERND* nd= new ERND("ERND", kTRUE,verbose);

  nd->SetGeometryFileName("ND1ch.geo.root");

  run->AddModule(nd);

  // ------------------------------------------------------------------------

  // -----   Create PrimaryGenerator   --------------------------------------

  FairPrimaryGenerator* primGen = new FairPrimaryGenerator();

//  Int_t pdgId = 2112; // neutron  beam

  Int_t pdgId = 11; // proton  beam

  Double32_t theta1 = 0.;  // polar angle distribution

  Double32_t theta2 = 0.;

  Double32_t kin_energy = ekin; //GeV

  Double_t mass = TDatabasePDG::Instance()->GetParticle(pdgId)->Mass();

  Double32_t momentum = TMath::Sqrt(kin_energy*kin_energy + 2.*kin_energy*mass); //GeV

  FairBoxGenerator* boxGen = new FairBoxGenerator(pdgId, 1);

  boxGen->SetThetaRange(theta1, theta2);

  boxGen->SetPRange(momentum, momentum);

  boxGen->SetPhiRange(0., 180.);

  boxGen->SetBoxXYZ(0.,0,0.0,0.0,-10.);

  boxGen->SetCosTheta();

  primGen->AddGenerator(boxGen);

  run->SetGenerator(primGen);

  // ------------------------------------------------------------------------

  // ------------------------ND digitizer -----------------------------------

  ERNDDigitizer* digitizer = new ERNDDigitizer(1);

  digitizer->SetEdepError(0.0,0.0,0.0);

  digitizer->SetLYError(0.0,0.0,0.0);

  digitizer->SetTimeError(0.0);

  digitizer->SetQuenchThreshold(0.005);

  digitizer->SetLYThreshold(0.004);

  digitizer->SetProbabilityB(0.1);

  digitizer->SetProbabilityC(0.3);

  run->AddTask(digitizer);

  // ------------------------------------------------------------------------

  //-------Set visualisation flag to true------------------------------------

  run->SetStoreTraj(kTRUE);

  //-------Set LOG verbosity  ----------------------------------------------- 

  FairLogger::GetLogger()->SetLogScreenLevel("DEBUG");

  // -----   Initialize simulation run   ------------------------------------

  run->Init();

  Int_t nSteps = -15000;

  //gMC->SetMaxNStep(nSteps);

  // -----   Runtime database   ---------------------------------------------

  Bool_t kParameterMerged = kTRUE;

  FairParRootFileIo* parOut = new FairParRootFileIo(kParameterMerged);

  parOut->open(parFile.Data());

  rtdb->setOutput(parOut);

  rtdb->saveOutput();

  rtdb->print();

  // ---------------------------------------------------------

  // -----   Run simulation  ------------------------------------------------

  run->Run(nEvents);

  // -----   Finish   -------------------------------------------------------

  //neuRad->WriteHistos();

  timer.Stop();

  Double_t rtime = timer.RealTime();

  Double_t ctime = timer.CpuTime();

  cout << endl << endl;

  cout << "Macro finished succesfully." << endl;

  cout << "Output file is sim.root" << endl;

  cout << "Parameter file is par.root" << endl;

  cout << "Real time " << rtime << " s, CPU time " << ctime

                  << "s" << endl << endl;

}