// Function converting pseudorapidity // interval to polar angle interval. It is used to set // the limits in the generator Float_t EtaToTheta(Float_t arg){ return (180./TMath::Pi())*2.*atan(exp(-arg)); } // Set Random Number seed using the current time TDatime dat; static UInt_t sseed = dat.Get(); void Config() { gRandom->SetSeed(sseed); cout<<"Seed for random number generation= "<GetSeed()<Load("libgeant321"); // Instantiation of the particle transport package. gMC is set internaly new TGeant3TGeo("C++ Interface to Geant3"); // Create run loader and set some properties AliRunLoader* rl = AliRunLoader::Open("galice.root", AliConfig::GetDefaultEventFolderName(), "recreate"); if (!rl) Fatal("Config.C","Can not instatiate the Run Loader"); rl->SetCompressionLevel(2); rl->SetNumberOfEventsPerFile(3); // Register the run loader in gAlice gAlice->SetRunLoader(rl); // Set external decayer TVirtualMCDecayer *decayer = new AliDecayerPythia(); decayer->SetForceDecay(kAll); // kAll means no specific decay is forced decayer->Init(); // Register the external decayer in the transport package gMC->SetExternalDecayer(decayer); // STEERING parameters FOR ALICE SIMULATION // Specify event type to be transported through the ALICE setup // All positions are in cm, angles in degrees, and P and E in GeV // For the details see the GEANT 3 manual // Switch on/off the physics processes (global) // Please consult the file data/galice.cuts for detector // specific settings, i.e. DRAY gMC->SetProcess("DCAY",1); // Particle decay gMC->SetProcess("PAIR",1); // Pair production gMC->SetProcess("COMP",1); // Compton scattering gMC->SetProcess("PHOT",1); // Photo effect gMC->SetProcess("PFIS",0); // Photo fission gMC->SetProcess("DRAY",0); // Delta rays gMC->SetProcess("ANNI",1); // Positron annihilation gMC->SetProcess("BREM",1); // Bremstrahlung gMC->SetProcess("MUNU",1); // Muon nuclear interactions gMC->SetProcess("CKOV",1); // Cerenkov production gMC->SetProcess("HADR",1); // Hadronic interactions gMC->SetProcess("LOSS",2); // Energy loss (2=complete fluct.) gMC->SetProcess("MULS",1); // Multiple scattering gMC->SetProcess("RAYL",1); // Rayleigh scattering // Set the transport package cuts Float_t cut = 1.e-3; // 1MeV cut by default Float_t tofmax = 1.e10; gMC->SetCut("CUTGAM", cut); // Cut for gammas gMC->SetCut("CUTELE", cut); // Cut for electrons gMC->SetCut("CUTNEU", cut); // Cut for neutral hadrons gMC->SetCut("CUTHAD", cut); // Cut for charged hadrons gMC->SetCut("CUTMUO", cut); // Cut for muons gMC->SetCut("BCUTE", cut); // Cut for electron brems. gMC->SetCut("BCUTM", cut); // Cut for muon brems. gMC->SetCut("DCUTE", cut); // Cut for electron delta-rays gMC->SetCut("DCUTM", cut); // Cut for muon delta-rays gMC->SetCut("PPCUTM", cut); // Cut for e+e- pairs by muons gMC->SetCut("TOFMAX", tofmax); // Time of flight cut // Set up the particle generation // AliGenCocktail permits to combine several different generators AliGenCocktail *gener = new AliGenCocktail(); // The phi range is always inside 0-360 gener->SetPhiRange(0, 360); // Set pseudorapidity range from -8 to 8. Float_t thmin = EtaToTheta(8); // theta min. <---> eta max Float_t thmax = EtaToTheta(-8); // theta max. <---> eta min gener->SetThetaRange(thmin,thmax); gener->SetOrigin(0, 0, 0); // vertex position gener->SetSigma(0, 0, 5.3); // Sigma in (X,Y,Z) (cm) on IP position gener->SetCutVertexZ(1.); // Truncate at 1 sigma gener->SetVertexSmear(kPerEvent); // First cocktail component: 100 ``background'' particles AliGenHIJINGpara *hijingparam = new AliGenHIJINGpara(100); hijingparam->SetMomentumRange(0.2, 999); gener->AddGenerator(hijingparam,"HIJING PARAM",1); // Second cocktail component: one gamma in PHOS direction AliGenBox *genbox = new AliGenBox(1); genbox->SetMomentumRange(10,11.); genbox->SetPhiRange(270.5,270.7); genbox->SetThetaRange(90.5,90.7); genbox->SetPart(22); gener->AddGenerator(genbox,"GENBOX GAMMA for PHOS",1); gener->Init(); // Initialization of the coctail generator // Field (the last parameter is 1 => L3 0.4 T) AliMagFMaps* field = new AliMagFMaps("Maps","Maps", 2, 1., 10., 1); gAlice->SetField(field); // Make sure the current ROOT directory is in galice.root rl->CdGAFile(); // Build the setup and set some detector parameters // ALICE BODY parameters. BODY is always present AliBODY *BODY = new AliBODY("BODY", "ALICE envelop"); // Start with Magnet since detector layouts may be depending // on the selected Magnet dimensions AliMAG *MAG = new AliMAG("MAG", "Magnet"); AliABSO *ABSO = new AliABSOv0("ABSO", "Muon Absorber"); // Absorber AliDIPO *DIPO = new AliDIPOv2("DIPO", "Dipole version 2"); // Dipole magnet AliHALL *HALL = new AliHALL("HALL", "ALICE Hall"); // Hall AliFRAMEv2 *FRAME = new AliFRAMEv2("FRAME", "Space Frame"); // Space frame AliSHIL *SHIL = new AliSHILv2("SHIL", "Shielding Version 2"); // Shielding AliPIPE *PIPE = new AliPIPEv0("PIPE", "Beam Pipe"); // Beam pipe // ITS parameters AliITSvPPRasymmFMD *ITS = new AliITSvPPRasymmFMD("ITS", "ITS PPR detailed version with asymmetric services"); ITS->SetMinorVersion(2); // don't change it if you're not an ITS developer ITS->SetReadDet(kFALSE); // don't change it if you're not an ITS developer ITS->SetThicknessDet1(200.); // detector thickness on layer 1:[100,300] mkm ITS->SetThicknessDet2(200.); // detector thickness on layer 2:[100,300] mkm ITS->SetThicknessChip1(150.); // chip thickness on layer 1: [150,300] mkm ITS->SetThicknessChip2(150.); // chip thickness on layer 2: [150,300] ITS->SetRails(0); // 1 --> rails in ; 0 --> rails out ITS->SetCoolingFluid(1); // 1 --> water ; 0 --> freon ITS->SetEUCLID(0); // no output for the EUCLID CAD system AliTPC *TPC = new AliTPCv2("TPC", "Default"); // TPC AliTOF *TOF = new AliTOFv5T0("TOF", "normal TOF"); // TOF AliRICH *RICH = new AliRICHv1("RICH", "normal RICH"); // HMPID AliZDC *ZDC = new AliZDCv2("ZDC", "normal ZDC"); // ZDC AliTRD *TRD = new AliTRDv1("TRD", "TRD slow simulator"); // TRD AliFMD *FMD = new AliFMDv1("FMD", "normal FMD"); // FMD AliMUON *MUON = new AliMUONv1("MUON", "default"); // MUON AliPHOS *PHOS = new AliPHOSv1("PHOS", "IHEP"); // PHOS AliPMD *PMD = new AliPMDv1("PMD", "normal PMD"); // PMD AliSTART *START = new AliSTARTv1("START", "START Detector"); // START // EMCAL AliEMCAL *EMCAL = new AliEMCALv2("EMCAL", "SHISH_77_TRD1_2X2_FINAL_110DEG"); AliVZERO *VZERO = new AliVZEROv7("VZERO", "normal VZERO"); // VZERO }