void runMCFOPI_GiBUU(TString outdir, 
                     int nEvents=5000, 
                     Int_t run = 0, unsigned int seed=0,bool target=true, int jobset=0) {

  // ------------------------------------------------------------------------
  gRandom->SetSeed(seed);
  gROOT->ProcessLine(".x $VMCWORKDIR/gconfig/rootlogon.C");
  // ========================================================================
  // Verbosity level (0=quiet, 1=event level, 2=track level, 3=debug)
  Int_t iVerbose = 1;
  FairRunSim *fRun = new FairRunSim();
  
  // set the MC version used
  // --------------------------------------------------
  TString mcMode = "TGeant3";
  fRun->SetName(mcMode);

  TString jobdir=outdir;
  int length = jobdir.Length();
  if(jobdir[length-1] != "/")
    jobdir.Append("/");
  TString jobname;
  if(jobset!=0){
    jobname=Form("GiBUU_FopiMC_set%i_run%i.mc.root",jobset,run);
  }else{
    jobname=Form("GiBUU_FopiMC_%i.mc.root",jobset,run);
  }

  
  TString outfile = jobdir+jobname;
  std::cout<<outfile<<std::endl;
  fRun->SetOutputFile(outfile);
  std::cout<<"Set output file to "<<outfile<<std::endl;

  TString copy = outfile;
  TString parfile = copy.ReplaceAll("mc.root","param.root");
  TString digifile = gSystem->Getenv("VMCWORKDIR");
  if(jobset!=0){
    digifile += Form("/tpc/FOPI/par/tpc.gibuu_sverre_al%i.par",jobset);
  }else{
    digifile += Form("/tpc/FOPI/par/tpc.gibuu_sverre.par",jobset);
  }
  cout<<digifile<<endl;
  //  char bufferGas[2];
  //  sprintf(bufferGas,"%s",gas);
  //  digifile += bufferGas;
  //  dififile += "_";
  //  char bufferField[
  FairLogger::GetLogger()->SetLogScreenLevel("WARNING");
  FairRuntimeDb *rtdb=fRun->GetRuntimeDb();
  FairParAsciiFileIo* parIo1 = new FairParAsciiFileIo();
  parIo1->open(digifile.Data(),"in");
  rtdb->setFirstInput(parIo1);
  Bool_t kParameterMerged=kTRUE;

  FairParRootFileIo* parOut=new FairParRootFileIo(kParameterMerged);
  parOut->open(parfile.Data());
  rtdb->setOutput(parOut);
  
  TpcDigiPar* par = (TpcDigiPar*) rtdb->getContainer("TpcDigiPar");
  par->setInputVersion(fRun->GetRunId(),1);
  par->setChanged(kTRUE);
  par->init();
  //================================================================================
  // build a run specific geometry
  // run the FopiGeom.C in a separate root session
  //
  // taroff: distance between target and center of magnet
  // targetpos: distance between real target position and nominal FOPI target
  // position
  // In experiment S339 the distance between the nominal FOPI target position
  // and the center of the magnet is 41 cm.
  Double_t taroff = -65;
  Double_t targetpos = taroff+41.;
  // possible materials: copper (default), lead, carbon
  TString targetmat = TString("copper");
  TString alignmentFileName = par->getAlignmentFile();
  TString geoFile;
  TString  command;
  command.Form(".! root -b -q  '$VMCWORKDIR/macro/tpc/FOPI/make_TPC_geo.C(kTRUE,\"%s\")'",alignmentFileName.Data());
  cout<<command<<endl;
  gROOT->ProcessLine(command);
  TString command2;
  //  command2.Form(".! root -b -q '$VMCWORKDIR/macro/tpc/FOPI/make_FOPI_target.C(\"%s\")'",targetmat.Data());
  gROOT->ProcessLine(command2);


  // In general, the following parts need not be touched
  // ========================================================================
  


  // -----   Timer   --------------------------------------------------------
  TStopwatch timer;
  timer.Start();
  // ------------------------------------------------------------------------


  // Set Material file Name
  //-----------------------
  fRun->SetMaterials("media_pnd.geo");
  
  // Create and add detectors
  //-------------------------
  // FairModule *Cave= new FopiDetector("FOPI");
  // Cave->SetGeometryFileName(geoFile);
  // fRun->AddModule(Cave);

  FairModule *Cave= new PndCave("CAVE");
  Cave->SetGeometryFileName("pndcave.geo");
  fRun->AddModule(Cave);

  //FairModule* fopitarget= (FairModule*) new FopiTarget("fopitarget","fopi target");
  //fopitarget->SetGeometryFileName("FOPI_TARGET.root");
  // fRun->AddModule(fopitarget);

  TpcDetector *Tpc = new TpcDetector("TPC", kTRUE);
  //Tpc->SetGeometryFileName(geoFileName);
  Tpc->SetGeometryFileName("FOPI_TPC.root");
  Tpc->SetMixture("TPCmixture"); // TPCmixture: Neon CO2 (90/10) //NEEDS TO BE IMPLEMENTED!!
  if(mcMode=="TGeant3") Tpc->SetAliMC();
  fRun->AddModule(Tpc);

  // TpcShield* TpcShield = new TpcShield("SHIELD", kTRUE);
  // TpcShield->SetGeometryFileName("FOPI_TPC_SHIELD.root");
  // fRun->AddModule(TpcShield);
   
  
  FairPrimaryGenerator* primGen = new FairPrimaryGenerator();
  fRun->SetGenerator(primGen);
  TpcAsciiGiBUUGenerator* gibuuGen = new TpcAsciiGiBUUGenerator("/nfs/hicran/data/tpc/fopi/2011/GiBUU/piCarbon11.dat");
  //  gibuuGen->SetStartEvent(220063);
  //Ordering of next two calls important!
  //  gibuuGen->ParticleFilter(3122);
  gibuuGen->SetStartEvent(nEvents*run);
  gibuuGen->SetTargetThickness(0);
  gibuuGen->SetVetoRadius(0);
  primGen->AddGenerator(gibuuGen);

  
  // Create and Set Magnetic Field
  // --------------------
  // Constant Field
  // PndConstField *fMagField=new PndConstField();
  // fMagField->SetField(0., 0. , 6. ); // values are in kG
  // fMagField->SetFieldRegion(-50, 50,-50, 50, -2000, 2000); // values are in cm
  // fRun->SetField(fMagField);

  FOPIField *fMagField = new FOPIField(0.616); 
  fMagField->SetTargetOffset(taroff);
  fRun->SetField(fMagField);
  /**Initialize the session*/
  fRun->Init();
//  PndStack* stack = (PndStack*) gMC->GetStack();
//  stack->StoreSecondaries(kTRUE)
//  stack->SetMinPoints(0)
//  stack->SetEnergyCut(0)
//  stack->StoreMothers(kTRUE)
  // Initialize the Digimapper:
  // TpcDigiPar* tpcpar = FairRun::Instance()->GetRuntimeDb()->getContainer("TpcDigiPar");
  // TpcDigiMapper::getInstance()->init(tpcpar);
  // //TpcDigiMapper::getInstance()->forceManualDriftVel(forceDriftVel);
  // TpcAlignmentManager::init(tpcpar->getAlignmentFile());
  rtdb->saveOutput();
  rtdb->print();

  // Transport nEvents
  // -----------------
  fRun->Run(nEvents);


  timer.Stop();
  Double_t rtime = timer.RealTime();
  Double_t ctime = timer.CpuTime();
  cout << endl << endl;
  cout << "Macro finished succesfully." << endl;
  cout << "Output file is "    << outfile << endl;
  cout << "Parameter file is " << parfile << endl;
  cout << "Real time " << rtime << " s, CPU time " << ctime << " s" << endl;
  cout << endl;
  // ------------------------------------------------------------------------


}