Introduction

• A.Gheata

Room: 40/R-D10 A short introduction of the series of meetings

Using GEANE in CBM track reconstruction algorithms

• Andrey Lebedev

Room: 40/R-D10 I'm working on the track reconstruction in the CBM experiment. And also I have put some efforts to the track propagation development, and compare the results with GEANE which we can use in cbmroot within the C++ interface. So, Denis suggested me to make a presentation about my developments for the track propagation algorithm/software.

General discussion Room: 40/R-D10 1. GEANE issues: "We would like to bring to your attention a problem we think to have detected in the GEANE behaviour at low energies." from Alessandra Filippi/INFN 2. Assemblies: In Geant4 they have no Id but in ROOT they have, this has consequences to the geometry tree, i.e: If one try to relay on the mother-daughter relation the code will differ between the different navigations (ROOT and G4Native) is it possible to have a unified concept? Why do they have an Id in ROOT? Sometimes they are even seen in the simulation, something which should never happened. 3. In TGeant3.cxx there is many particles and decay modes that are hard coded there! If one try to define his own particles and decay modes it could conflict, and I already runs into problems and get very strange results before finding out that some things are hard coded. 4. Cerenkov total reflection: it is not working properly with GeoManager, when comparing with G4Native, it is working as expected (the same geometry is converted to Native G4 via VGM) 5. Geane-VMC: Eustep.F has to be re-written in C++ to have more control on the stepping behavior of Geane 6. "Proposed step is 0" issue in FLUKA VMC - In some condition there are some slow electrons (P ~= 500 KeV) that try to do very short step (~ 1.e-20 cm) so simulation code cannot go on. - reported by Vito in the context of ILCroot 7.The warning from Geant4 VMC when running with G4Root: "No physical volume found at track vertex: (107635,-190901,-638802)"