10.05.2004 CBM Software Meeting 1

CBM Simulation & Analysis FrameworkCBM Simulation & Analysis FrameworkGeant3 / Gean4 configurationGeant3 / Gean4 configuration

M. Al-Turany, D. Bertini

10.05.2004 CBM Software Meeting 2

Simulation Run configuration Simulation Run configuration

• MC configuration is user defined and done via ROOT macro

• Geant3 Config Macro:– <CBM_VMC>/macro/run/g3Config.C– Control of the physical process

• Full Access to Geant 3 common blocks:– /GCPHYS/– /GCUTS/– /GCKING/

• Geant4 Config Macro– <CBM_VMC>/macro/run/g4Config.C– Definition of physic list ( + intrinsic cuts )– Definition of user defined Geant4 “actions”

10.05.2004 CBM Software Meeting 3

g3Config.Cg3Config.C

void Config() {

TGeant3* geant3 = new TGeant3("C++ Interface to Geant3");

cout << "Geant3 has been created." << endl;

// ******* GEANT3 configuration for simulated Runs *******

geant3->SetTRIG(1); //Number of events to be processed

geant3->SetSWIT(4, 10);

geant3->SetDEBU(0, 0, 1);

geant3->SetAUTO(1); //Select automatic STMIN etc... calc. (AUTO 1) or manual (AUTO 0)

geant3->SetABAN(0); //Restore behaviour for abandoned tracks

…

10.05.2004 CBM Software Meeting 4

Physical processesPhysical processes

• Direct pair production, Bremsstrahlung and muon nuclear interaction geant3->SetPAIR(1);

geant3->SetBREM(1); geant3->SetMUNU(1);

• Multiple scattering is switched on with the following line: geant3->SetMULS(1); and can be switched of for test purposes: geant3->SetMULS(0);

• With the following line we chose energy loss with restricted fluctuations and delta-electron production above a threshold. geant3->SetLOSS(1); geant3->SetDRAY(1);

• For test runs you might want to use full Landau fluctuations without delta-ray production: geant3->SetLOSS(2);

• Or no fluctuations at all: geant3->SetLOSS(4);

10.05.2004 CBM Software Meeting 5

Physical processesPhysical processes

• For background simulations it is important to simulate all photon interactions: geant3->SetCOMP(1); geant3->SetPHOT(1); geant3->SetPAIR(1);

• and processes producing photons: geant3->SetANNI(1);

• If Decays of the vector mesons are performed at the generator level through an interface (PYTHIA/JETSET) it is then important to switch on particle decays by GEANT: geant3->SetDCAY(1);

• For the simulation of hadronic showers you can chose between: geant3->SetHADR(1);  //Select pure GEANH geant3->SetHADR(3);  // GEANH/NUCRIN geant3->SetHADR(4);  // FLUKA interface

10.05.2004 CBM Software Meeting 6

Kinetic CutsKinetic Cuts

The kinetic energy cuts for the various particle types are specified in the following line:

Float_t cut    = 1.e-3; // 1 MeV cut by default

Float_t tofmax = 1.e10;

// GAM  ELEC NHAD  CHAD MUON EBREM  MUHAB EDEL  MUDE MUPA  TOFMAX geant3->SetCUTS(cut, cut, cut, cut, cut, cut,   cut,  cut,  cut,  2.1e-3, tofmax);

10.05.2004 CBM Software Meeting 7

g4Config.Cg4Config.C

void Config() {

// RunConfiguration for Geant4 (std VMC)

// TG4RunConfiguration* runConfiguration

// = new TG4RunConfiguration();

CBMRunConfiguration* runConfiguration = new CBMRunConfiguration();

cout << "Geant4 has been created. 1 " << endl;

// TGeant4 instance

TGeant4* geant4 = new TGeant4("TGeant4", "The Geant4 Monte Carlo", runConfiguration);

// Customise Geant4 setting // (verbose level, global range cut, ..)

geant4->ProcessGeantMacro("g4config.in"); }

10.05.2004 CBM Software Meeting 8

g4Config.ing4Config.in

# Geant4 configuration macro for g4

# (called from Root macro Config.C)

#/process/eLoss/subsec false

#/process/eLoss/minsubsec 2 cm

# switch on/off B field

/mcDet/fieldType None

# Store or don't store secondaries

/mcTracking/saveSecondaries true

# use debug/verbosity mode

/mcVerbose/all 1

/mcVerbose/physicsList 2

/tracking/verbose 2

10.05.2004 CBM Software Meeting 9

Physical ProcessesPhysical Processes

# Special setting for the different physic list

#Special cuts “a la Geant3”

/mcPhysics/setSpecialCuts false

mcPhysics/printGeneralCuts true

#Switch on off physic list

/mcPhysics/setEM true

/mcPhysics/setMuon true

/mcPhysics/setHadron false

/mcPhysics/setOptical false

# cut in range ( 1 mm)

/mcPhysics/rangeCut 1.

/run/particle/dumpCutValues

10.05.2004 CBM Software Meeting 10

G4 Config via compiled codeG4 Config via compiled code

• CBMRunConfiguration class– Creates the mandatory Geant4 physic classes and the other

user action classes. – void CBMRunConfiguration::CreateUserConfiguration() – Gives user access to Stacking mechanism

• Can use the new Geant4 Packaging Physic Lists– Recommended compare to using physic list from Example

N04/N06 – Provide different models for hadronic interaction

• User can choose in the Educated Guess Physics Lists for Geant4 HADronic Physics :

• http://cmsdoc.cern.ch/~hpw/GHAD/HomePage/

10.05.2004 CBM Software Meeting 11

G4 Config via CBMRunConfigurationG4 Config via CBMRunConfiguration

void CBMRunConfiguration::CreateUserConfiguration() {// create mandatory Geant4 classes fDetectorConstruction = new TG4DetConstruction(); fSDConstruction = new TG4SDConstruction(); fPhysicsList = new TG4ModularPhysicsList(); fPrimaryGenerator = new TG4PrimaryGeneratorAction();

// create the other user action classes fRunAction = new TG4RunAction(); fEventAction = new TG4EventAction(); fTrackingAction = new TG4TrackingAction(); fSteppingAction = new TG4SteppingAction(); fStackingAction = new CBMSpecialStackingAction();

…. }

10.05.2004 CBM Software Meeting 12

G4 Config via CBMRunConfigurationG4 Config via CBMRunConfiguration

void CBMRunConfiguration::CreateUserConfiguration() {

… TG4ModularPhysicsList* tg4fPhysicsList = dynamic_cast<TG4ModularPhysicsList*>(fPhysicsList);

// take User physic definition

tg4fPhysicsList->SetDefaultCutValue(0.1*mm);

G4double mycut = 0.1*mm;

tg4fPhysicsList->SetRangeCut(mycut);

tg4fPhysicsList->SetVerboseLevel(6);

// Register user defined physics constructor

tg4fPhysicsList->RegisterPhysics( new GeneralPhysics("general")); // General Physics

tg4fPhysicsList->RegisterPhysics( new EMPhysics("standard EM")); // EM Physics

tg4fPhysicsList->RegisterPhysics( new MuonPhysics("muon")); // Muon Physics

tg4fPhysicsList->RegisterPhysics( new HadronPhysicsQGSP("hadron")); // Hadron Physics

tg4fPhysicsList->RegisterPhysics( new IonPhysics("ion")); // Ion Physics

10.05.2004 CBM Software Meeting 13

CBMStackingActionCBMStackingActionG4ClassificationOfNewTrack CBMSpecialStackingAction::ClassifyNewTrack ( const

G4Track *   track ) {// Classifies the new track. // --- G4ClassificationOfNewTrack classification; G4int parentID = track->GetParentID();if (parentID ==0) return fUrgent; else{ // exclude secondary neutrinos G4ParticleDefinition* particle = track->GetDefinition(); if( particle == G4NeutrinoE::NeutrinoEDefinition() || particle == G4NeutrinoMu::NeutrinoMuDefinition() || particle == G4NeutrinoTau::NeutrinoTauDefinition() || particle == G4AntiNeutrinoE::AntiNeutrinoEDefinition() || particle == G4AntiNeutrinoMu::AntiNeutrinoMuDefinition() || particle == G4AntiNeutrinoTau::AntiNeutrinoTauDefinition()) { return fKill; } return fWaiting; } …return classification;}

10.05.2004 CBM Software Meeting 14

CBM Simulation & Analysis FrameworkCBM Simulation & Analysis FrameworkMerging Transported EventMerging Transported Event

M. Al-Turany, D. Bertini

10.05.2004 CBM Software Meeting 15

Creating bkg+signal Creating bkg+signal

Run_all.CSTS

UrQmD Gen

UrQmDInput File

STSPoints

Bkg.root

TParticle

TTree

Run_all.CSTS

AscII Gen

ASCIIInput FileD0 signal

STSPoints

SigD0.root

TParticle

TTree

10.05.2004 CBM Software Meeting 16

Merging at MCPoint levelMerging at MCPoint level

STSPoints

Bkg.root

TParticle

TTree

STSPoints

SigD0.root

TParticle

TTreeSTSPoints

Bkg+SigD0.root

TParticle

TTree

Merging

Reindexing/evts of arrays needed CBMStack CBMSTSPoints

10.05.2004 CBM Software Meeting 17

CBMROOTManagerCBMROOTManager

Method to store TObjectRegister(name,folder,TObject* obj)Register(name,folder,TCollection* obj)

Input Data ManipulationAddFriend( )

AddAndMerge()

CBMRootManager

• Provide service for merging:– AddAndMerge(TFile *f); – isMerging => kTRUE

• Modify Event loop– Reading an Event calls

• Reindexation and merging of Particle Stack information from different CBMApplication

• Reindexation and merging of all TClonesArray at the MCPoint level for all Detectors stored in the CBMApplication

• Dispatch calls to the different CBMDetector::CopyClones(…) implementation

Method to access DataFrom file: ActivateBranch( brname)

From Memory: GetMergedObject( brname)

10.05.2004 CBM Software Meeting 18

Virtual CBMDetector::CopyClonesVirtual CBMDetector::CopyClones

void CBMTracker::CopyClones ( TClonesArray *cl_orig, TClonesArray* cl_merged, Int_t offset ){ Int_t entries = cl_orig->GetEntriesFast(); TClonesArray &clRef = *cl_merged; CBMSTSPoint *pts = NULL; // Reindex and add pointer to merged TClonesArray for (Int_t i=0;i< entries ; i++ ) { pts = (CBMSTSPoint *) cl_orig->At(i); Int_t index = pts->GetTrackID() + offset; pts->SetTrackID( index ); CBMSTSPoint* pt = new (clRef[pos] ) CBMSTSPoint( *pts ); pos++; }}

10.05.2004 CBM Software Meeting 19

Macro for merging Macro for merging

// Load Libraries gROOT->LoadMacro("../basiclibs.C"); basiclibs(); gSystem->Load("libCbm"); gSystem->Load("libITrack");

CBMRun *fRun= new CBMRun(); fRun->SetInputFile("background_g3.root"); // merge now inputs at the MC Points fRun->AddAndMerge("signal_g3.root"); fRun->AddAndMerge("background_g3.root");

fRun->SetOutputFile("cbmout.root"); CBMITrack *it= new CBMITrack ("ITrack"); fRun->AddTask(it); fRun->LoadGeometry(); fRun->Init(); fRun->Run(3);