Towards comparisons between TFluka and TGeant3 ( within CbmRoot Framework) Denis Bertini (IT-GSI)...

Towards comparisons betweenTowards comparisons betweenTFluka and TGeant3TFluka and TGeant3

( within CbmRoot Framework)( within CbmRoot Framework)

Denis Bertini (IT-GSI)

Antonin Maire (IPHC Strasbourg)

16.10.2006 Muon Collaboration Meeting 2

OutlineOutline• CbmRoot ( Simulation and Analysis framework)

– Virtual Monte Carlo ( ROOT release 5.12 )– TGeant3 ( version 2005 )– TFluka (v4-04-Rev05 , using Fluka version 2005.6 )

• Fluka/G3 MCStack structure• Comparisons

– mediums • Fe @ (10) cm ( Xo = 1.76 cm , λi = 16.7 cm)

• C @ ( 30) cm ( Xo = 18.8 cm , λi = 38.1 cm )

– π @ (1-3 GeV) – p @ ( 5 GeV)– Beam particles: 5000– Secondaries : Ethres.= 50 KeV

• Summary


Virtual Monte Carlo (VMC)Virtual Monte Carlo (VMC)

User Code

VMC

Virtual Geometrical

Modeller

G3 G3 transport

G4 transportG4

FLUKA transportFLUKA

Geometrical Modeller

Reconstruction

Visualisation


What is Fluka?What is Fluka?

• FLUKA Particle Transport Monte Carlo Code

– Has evolved since long into a mature system.

– Evolution based on thorough physics validation.

– Almost unique capabilities for simulating hadronic interactions including low-energy neutron transport

• Its state of the art physics capabilities comprise

– Hadron-hadron, hadron-nucleus, and gamma-nucleus interactions 0-10^4 TeV

– Nucleus-nucleus interactions 0-10^4 TeV/n (RQMD, DPMJETIII)

– Electromagnetic and µ interactions 1 keV-10^4 TeV

– Neutrino interactions and nucleon decays

• FLUKA has proven capabilities in:

– Accelerator design and shielding (standard tool at CERN for beam-machine and Radioprotection studies

– Dosimetry and hadro-therapy

– Space radiation and cosmic ray showers in the atmosphere (Support by NASA, “de facto” standard tool for all aircraft dosimetry studies in Europe)


Interface to FLUKA:Interface to FLUKA:Geometry and NavigationGeometry and Navigation

TFluka

TVirtualMC TFlukaMCGeometry

TFluka TFlukaTGeoMCGeometry

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FLUKA

TGeo(1) Geometry Definition

(2) Navigation

User Application

Interface implemented by A. Gheata


Interface to FLUKA: Interface to FLUKA: Physics ConfigurationPhysics Configuration

TFluka

TVirtualMC

TFluka

TFlukaTFlukaScoringOption

TFlukaTFlukaConfigOption

FLUKA

Text Input

TFlukaCerenkov

User Application

Generated fromC++ Macros


TGeo -> Fluka input fileTGeo -> Fluka input file ************* MATERIALS **********************

*...+....1....+....2....+....3....+....4....+....5....+....6....+....7...

MATERIAL 1.0 1.008 9.990e-01 3.0 HYDROGEN

MATERIAL 6.0 12.011 9.990e-01 4.0 CARBON

MATERIAL 9.0 18.998 9.990e-01 5.0 FLUORINE

MATERIAL 13.0 26.982 9.990e-01 6.0 ALUMINUM

MATERIAL 14.0 28.085 9.990e-01 7.0 SILICON

MATERIAL 26.0 55.845 9.990e-01 8.0 IRON

MATERIAL 79.0 196.967 9.990e-01 9.0 GOLD

MATERIAL 3.750e-03 10.0 AIR

COMPOUND -0.235407 4.0 -0.019758 3.0 -0.744835 5.0AIR

********************* TGEO MATERIAL ASSIGNMENTS *********************

*

*...+....1....+....2....+....3....+....4....+....5....+....6....+....7...

* Assigning material: air to Volume: cave

ASSIGNMAT 10.0 1.0 0.0 0.0 0.0 0.0

* Assigning material: carbon to Volume: pipe1

ASSIGNMAT 11.0 2.0 0.0 0.0 1.0 0.0

* Assigning material: vacuum to Volume: pipevac1

ASSIGNMAT 2.0 3.0 0.0 0.0 1.0 0.0

//--- define some materials

TGeoMaterial *matVacuum = new TGeoMaterial("Vacuum", 0,0,0)

TGeoMaterial *matAl = new TGeoMaterial("Al", 26.98,13,2.7);

//--- define some media

TGeoMedium *Vacuum = new TGeoMedium("Vacuum",1, matVacuum)

TGeoMedium *Al = new TGeoMedium("Root Material",2, matAl);

// Define the geometry using TGeo Class

TGeoVolume *cave = geom->MakeBox("cave", Vacuum, 25., 25., 5.);

cave->SetVisibility(kFALSE);

TGeoVolume *pipe = geom->MakeBox("pipe", Al, 5., 20., 5.)

pipe->SetLineColor(kBlue);

Top->AddNode(pipe, 1, cave);

TGeoVolume *pipe_vac = geom->MakeBox("pipe_vac", Al, 17.5, 5., 5.);

pipe_vac->SetLineColor(kBlue);

Top->AddNode(pipe_vac, 1, pipe);

ROOT Macro to Define Materials and Geometry


Physics config. input filePhysics config. input file

void Config(){ // Set Random Number seed gRandom->SetSeed(12345);TFluka * gMC = new TFluka("C++ Interface to Fluka", 0); // Physics process control

gMC->SetProcess("DCAY",1); gMC->SetProcess("PAIR",1); gMC->SetProcess("COMP",1); gMC->SetProcess("PHOT",1); gMC->SetProcess("PFIS",0); gMC->SetProcess("DRAY",1); gMC->SetProcess("ANNI",1); gMC->SetProcess("BREM",1); gMC->SetProcess("MUNU",1); gMC->SetProcess("CKOV",1); gMC->SetProcess("HADR",1); gMC->SetProcess("LOSS",2); gMC->SetProcess("MULS",1); gMC->SetProcess("RAYL",1); Float_t cut = 1.e-3; // 1MeV cut by default Float_t tofmax = 1.e10; gMC->SetCut("CUTGAM", cut); gMC->SetCut("CUTELE", cut); gMC->SetCut("CUTNEU", cut); gMC->SetCut("CUTHAD", cut); gMC->SetCut("CUTMUO", cut); gMC->SetCut("BCUTE", cut); gMC->SetCut("BCUTM", cut); gMC->SetCut("DCUTE", cut); gMC->SetCut("DCUTM", cut); gMC->SetCut("PPCUTM", cut); gMC->SetCut("TOFMAX", tofmax);

ROOT Macro for Fluka Physics process control

*Global process and cut settings ** --- DCAY --- Decays. Flag = 1* Decays are on by default** --- PAIR --- Pair production by gammas, muons and hadrons. Flag = 1, PPCUTM = 0.001, PPCUTE = 0.001EMFCUT 0.0 0.0 0 3.0 15.0 1.0PHOT-THR** +++ BREM --- Bremsstrahlung by muons/hadrons. Flag = -1, BCUTM = 0.001 PAIRBREM 3.0 0 0.001 3.0 15.0** --- COMP --- Compton scattering Flag = 1 EMFCUT 0.0 0.0 0.0 3.0 15.0 1.0PHOT-THR** --- PHOT --- Photoelectric effect. Flag = 1EMFCUT 0 0 0 3.0 15.0 1.0PHOT-THR** --- PFIS --- Photonuclear interaction Flag = 0PHOTONUC -1.0 0.0 0.0 3.0 15.0 1.0** --- ANNI --- Positron annihilation. Flag = 1 EMFCUT 0.0 0.0 0.0 3.0 15.0 1.0ANNH-THR** --- MUNU --- Muon nuclear interaction. Flag = 1MUPHOTON 1.0 0.250 0.750 3.0 15.0 1.0** --- HADR --- Hadronic interactions. Flag = 1**Hadronic interaction is ON by default in FLUKA** --- MULS --- Muliple Scattering. Flag = 1**Multiple scattering is ON by default in FLUKA** --- RAYL --- Rayleigh Scattering. Flag = 1*

Fluka input file


G3/FLUKA:G3/FLUKA: Differences in Stepping Behaviour Differences in Stepping Behaviour

Sensitive Volume

1 2

Geant 31: entering (Id1)1: exiting (Id1)2: entering (Id2)2: exiting (Id2)

Fluka1: entering (Id1)1: disappeared (Id1)2: entering (Id2)2: exiting (Id2)1: entering (Id3)1: exiting (Id3)

2 Hits: 3 Hits2 part. in Stack 3 part. in Stack !

G3/Fluka MCStack with different structure !

TrackId1

TrackId3

TrackId2

primary μ redundancy !

Suppressed redundancy


Type of exiting particles for Pion beam Type of exiting particles for Pion beam (3 GeV) on C (30 cm ) / Iron (10 cm ) (3 GeV) on C (30 cm ) / Iron (10 cm )


Type of exiting particles for Proton beam Type of exiting particles for Proton beam (5 GeV) on C (30 cm ) & Iron (30 cm ) (5 GeV) on C (30 cm ) & Iron (30 cm )


Pions 3 GeV on Carbon ( 30 cm )Pions 3 GeV on Carbon ( 30 cm )

!x 3


Protons 5 Gev on Carbon (30 cm)Protons 5 Gev on Carbon (30 cm)

!

-20 %!

x 2


Protons 5GeV on Iron (10 cm)Protons 5GeV on Iron (10 cm)

!+20%


Pions 3GeV on Iron (10 cm)Pions 3GeV on Iron (10 cm)

!+10 %


Pions 1 Gev on Iron (10 cm)Pions 1 Gev on Iron (10 cm)

!+25 %


Primary Pions 3GeV/c on Iron 10 cmPrimary Pions 3GeV/c on Iron 10 cm TGeant3TGeant3


Primary Pions 3GeV/c on Iron 10 cmPrimary Pions 3GeV/c on Iron 10 cm TFlukaTFluka

???


Secondary Pions P vs Z vertexSecondary Pions P vs Z vertex ( Pi Beam at 3GeV on 10cm Iron)( Pi Beam at 3GeV on 10cm Iron)

TFLUKA TGEANT3


SummarySummary

• Use of VMC to compare Fluka& Geant– needs closer collaboration with

• Fluka team

• VMC TFluka team

• To be done – crosscheck with native Fluka– Physics validation with dedicated experimental

data sets

Towards comparisons between TFluka and TGeant3 ( within CbmRoot Framework) Denis Bertini (IT-GSI)...

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