New Hadr02 test for Ion-Ion simulation Ivantchenko V., Ivantchenko A.

Outline Introduction New example Hadr02 Results and comparison Discussions 12/7/20152

INTRODUCTION 12/7/20153

Ion/Ion models in G4 9.4 There are many requests to have ion-ion simulation within Geant4 – ESA – Recently NA61 Models existing – BinaryLightIon for all Ions up to 15 GeV/u – LHEP and CHIPS only for light ions – G4QMD for all ions up to 15 GeV/u (very slow) 12/7/20154

DPMJET-II.5 interface High energies (>10GeV/u) Ion/Ion interactions Software is provided by P. Truscott – it is a version prepared for usage in Geant4 during MARS-REM project sponsored by ESA few years ago from the original DPMJET-II.5 FLUKA code Our experience in DPMJET within the GRAS tool – Initially installation at SLC4 32 bit gcc3.4.6 was achieved – Installation completely fails at SLC5 default compiler gcc4.1 – Recently installation at SLC5 64 bit gcc4.3.2 was achieved 12/7/20155

DPMJET INSTALLATION IN HADR02 12/7/20156

Our Method For DPMJET interface: – Different from recommendations of MARS-REM In geant4/examples/extended/hadronic – Extra subdirectory “dpmjet2_5” – Extra subdirectory “GlauberData” – Extended makefiles of the example Our favorite is the FTF model – Is available since 9.4ref02 12/7/20157

Details of implementation – Example is cloned from Hadr01 with some simplification – dpmjet2.5 – separate directory for DPMJET source files – dpmjet2.5/dpm25src – FORTRAN files – dpmjet2.5/include – C++ header files for DPMJET interface – dpmjet2.5/src– source files for DPMJET interface – GlauberData – Glauber cross sections database – $GRAS_USE_DPMJET - new environment variable – install.csh, setup.csh - extra files for installation – Physics Lists details see in Discussions 12/7/20158

RESULTS AND COMPARISON FOR 9.4.REF02 12/7/20159

First try Target 10 cm Al Primary beam 6400 GeV Ion S32 (Z = 16, A = 32) CPU for DPMJET and FTFP are similar Cut 1 km (no delta-electrons) All secondary particles are killed (no shower) ! 12/7/201510

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Energy log10(GeV) of secondary's d, t, Ions 12/7/201514

Z and A of fragments 12/7/201515

Summary FTF and DPMJET are working inside Hadr02 CPU and physics performance are similar FTF has no projectile fragmentation 12/7/201516

DISCUSSION OF PROBLEMS 12/7/201517

Problems of DPMJET Installation is achieved at SLC5 64 bits gcc 4.3 Extra libraries are used: – CERNLIB, gmp, mpfr – At pcgeant05 we have a warning : local gmp version is different from one of LCG GlauberData for DPMJET are limited – He(Z=2) – Ce( Z = 58) FPE_DEBUG is off, because inside DPMJET there is at least one division by zero 12/7/201518

Physics List of Hadr02 Only reference Physics List is used Two additional ion physics builders are created – IonDPMJETPhysics.cc for DPMJET – IonFTFPhysics.cc for FTF – Low energy ion-ion models are not included in these builders These builders are registered additionally to any existing reference Physics List via UI command – This is kind of limitation, because some ion physics is already exist – Results below are obtained with QGSP_BIC 12/7/201519

Problems of Physics Lists We would like to suggest to extended public interface to G4VModularPhysicsList allowing to substitute existing physics builder by a new one provided by users Likely this will require to add enumeration for Physics List builders 12/7/201520