1. Towards comparisons between TFluka and TGeant3 ( within CbmRoot Framework) Denis Bertini (IT-GSI) Antonin Maire (IPHC Strasbourg)

2. 16.10.2006Muon Collaboration Meeting 2 Outline 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

3. 16.10.2006Muon Collaboration Meeting 3 Virtual Monte Carlo (VMC) User Code VMC Virtual Geometrical Modeller G3 G3 transport G4 transport G4 FLUKA transport FLUKA Geometrical Modeller Reconstruction Visualisation

4. 16.10.2006Muon Collaboration Meeting 4 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)

5. 16.10.2006Muon Collaboration Meeting 5 Interface to FLUKA: Geometry and Navigation TFluka TVirtualMC TFlukaMCGeometry TFluka TGeoMCGeometry idnrwr g1wr g1rtwr conhwr inihwr jomiwr lkdbwr lkfxwr lkmgwr lkwr nrmlwr rgrpwr isvhwr magfld FLUKA TGeo (1) Geometry Definition (2) Navigation User Application Interface implemented by A. Gheata

6. 16.10.2006Muon Collaboration Meeting 6 Interface to FLUKA: Physics Configuration TFluka TVirtualMC TFluka TFlukaScoringOption TFluka TFlukaConfigOption FLUKA Text Input TFlukaCerenkov User Application Generated from C++ Macros

7. 16.10.2006Muon Collaboration Meeting 7 TGeo -> 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

8. 16.10.2006Muon Collaboration Meeting 8 Physics 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 = 0.001 EMFCUT 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 = 1 EMFCUT 0 0 0 3.0 15.0 1.0PHOT-THR * * --- PFIS --- Photonuclear interaction Flag = 0 PHOTONUC -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 = 1 MUPHOTON 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

9. 16.10.2006Muon Collaboration Meeting 9 G3/FLUKA: Differences in Stepping Behaviour Sensitive Volume 1 2 Geant 3 1: entering (Id1) 1: exiting (Id1) 2: entering (Id2) 2: exiting (Id2) Fluka 1: entering (Id1) 1: disappeared (Id1) 2: entering (Id2) 2: exiting (Id2) 1: entering (Id3) 1: exiting (Id3) 2 Hits: 3 Hits 2 part. in Stack 3 part. in Stack ! G3/Fluka MCStack with different structure ! TrackId1 TrackId3 TrackId2 primary μ redundancy ! Suppressed redundancy

10. 16.10.2006Muon Collaboration Meeting 10 Type of exiting particles for Pion beam (3 GeV) on C (30 cm ) / Iron (10 cm )

11. 16.10.2006Muon Collaboration Meeting 11 Type of exiting particles for Proton beam (5 GeV) on C (30 cm ) & Iron (30 cm )

12. 16.10.2006Muon Collaboration Meeting 12 Pions 3 GeV on Carbon ( 30 cm ) ! x 3

13. 16.10.2006Muon Collaboration Meeting 13 Protons 5 Gev on Carbon (30 cm) ! -20 %! x 2

14. 16.10.2006Muon Collaboration Meeting 14 Protons 5GeV on Iron (10 cm) ! + 20%

15. 16.10.2006Muon Collaboration Meeting 15 Pions 3GeV on Iron (10 cm) ! +10 %

16. 16.10.2006Muon Collaboration Meeting 16 Pions 1 Gev on Iron (10 cm) ! +25 %

17. 16.10.2006Muon Collaboration Meeting 17 Primary Pions 3GeV/c on Iron 10 cm TGeant3

18. 16.10.2006Muon Collaboration Meeting 18 Primary Pions 3GeV/c on Iron 10 cm TFluka ???

19. 16.10.2006Muon Collaboration Meeting 19 Secondary Pions P vs Z vertex ( Pi Beam at 3GeV on 10cm Iron) TFLUKATGEANT3

20. 16.10.2006Muon Collaboration Meeting 20 Summary 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