1. Simulation Project Setup Status Torre Wenaus, BNL/CERN LCG Applications Area Manager http://cern.ch/lcg/peb/applications PEB Meeting January 28, 2003

2. Torre Wenaus, BNL/CERN PEB meeting, January 28, 2003 Slide 2 Simulation Project  Mandated by SC2 in Dec to initiate simulation project, following the RTAG recommendations  Discussions with experiments, G4, FLUKA, ROOT, … on organization and roles in progress  Approach to organization is a single, large, broadly scoped project with several subprojects  Keep the overall project leader job relatively thin  Overall vision, organization, planning, communication, coherence, ‘politics’  Strong subproject leaders  Direct technical leadership of activities  Simulation subprojects larger in some cases than typical work packages in other projects, and with less horizontal coupling  Some subprojects likely to be divided into work packages  Scope and tentative subproject breakdown based on RTAG recommendations

3. Torre Wenaus, BNL/CERN PEB meeting, January 28, 2003 Slide 3 Tentative Subproject Breakdown (1)  Generic simulation framework  Multiple simulation engine support, geometry model, generator interface, MC truth, user actions, user interfaces, average ‘GEANE’ tracking, utilities  ALICE virtual MC as starting point if it meets requirements  With G4, the largest in terms of apps area development effort  Geant4 development, integration, support, maintenance  The CERN/LCG participation in G4  IT/API team moving to EP/SFT, plus participants from experiments Based directly on RTAG recommendations

4. Torre Wenaus, BNL/CERN PEB meeting, January 28, 2003 Slide 4 Tentative Subproject Breakdown (2)  FLUKA integration  CERN participation in FLUKA development proper not via the applications area  This activity involves FLUKA integration with the generic simulation framework  Anticipate using ALICE’s good connections to the FLUKA team to aid in this activity  Physics validation  The G4 validation program that originated in ATLAS and has since broadened, moves to this project  Largely coordination and communication with efforts taking place within the experiments; not a large effort directly in this LCG project  A team with active participants in each experiment  Scope broader than G4, to simulation physics validation in general  Including also simulation test and benchmark suite development

5. Torre Wenaus, BNL/CERN PEB meeting, January 28, 2003 Slide 5 Tentative Subproject Breakdown (3)  Fast shower parameterisation  Examine integration of GFLASH-like functionality into the simulation framework  Model lateral and longitudinal shower profiles and deposit E spots based on profile and sampling fluctuations  Allow fast parameterisation in calorimetry to coexist with detailed simulation elsewhere  Generator services  Follow recommendations of MC generator RTAG  Generator librarian; common event files, validation/test suite; sw support, and development if needed (HEPMC, HepPDT)  A simulation subproject, rather than a small project  Oversight and direction from MC4LHC

6. Torre Wenaus, BNL/CERN PEB meeting, January 28, 2003 Slide 6 Personnel  Very good candidates acceptable to the experiments and agreeable themselves identified for some subprojects  Others require more discussion  Probable that I will lead the overall project during a startup period, working with a slate of strong subproject leaders  Possibly to be followed by adding overall leadership to a subproject leader’s job  Or attracting to the job a good candidate unable to commit all of their time  Hence the interest in keeping the top job relatively thin  Two LCG participants currently active in simu will continue  LCG-Russia interest in the generator services subproject  CERN Geant4 team  Most of the rest must come from experiments  Work is obviously well suited to that

7. Torre Wenaus, BNL/CERN PEB meeting, January 28, 2003 Slide 7 Plan  Discussions ongoing to  complete definition of and agreement on the project organization  identify candidate leaders and participants  Initial ideas for generic simulation framework project being developed  Expect to have the subproject breakdown settled and many subproject leaders in place circa mid-Feb  Simulation project workplan due at SC2 Mar 14  I expect to make it