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STAR simulations

The STAR simulation framework, operational since 1996, features a hierarchical design that separates user code from implementation details, enhancing usability and memory management. It supports an extensive array of elements with no limits enforced on tracks, vertices, or hits, beyond physical memory constraints. The framework seamlessly interfaces with Geant3/PAW, MySQL, and ROOT, offering robust capabilities for geometrical modeling and event simulation. With meticulous attention to detail, it provides a comprehensive set of modules and a user-friendly geometry navigator, enabling developers to access and manipulate complex geometries easily.

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STAR simulations

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  1. STAR simulations GSTAR framework OO geometry model event access

  2. STAR detector at RHIC

  3. GSTAR • STAR simulation framework since 96 • has a hierarchical design to clearly separate user code from implementation details • has improved memory management • elastic ZEBRA (using malloc) • no limits on number of tracks, vertices, hits etc (apart from physical memory limits) • has built-in interfaces to implementation • Geant3/PAW, MySQL, ROOT

  4. Hierarchical design • Open System Interconnection (OSI) model as example: functionality in term of layers • basic (physical) layer - platform dependant code, system libraries,graphics etc • low (logical) layer - ZEBRA, DZDOC,HIGS • upper (transport) - G3, Paw+Kuip, DB, ROOT • system (session) - AGI, ROOT accessors • user (application) - modules in F, AGI, C++

  5. STARgeometry • Modules: 14 • Structures: 34 • Instances: 45 • Parameter values: 841

  6. Database Browser • Versioned geometries

  7. STAR geometry • Formalized description in specification language, including hits and DB access • Many developers, very detail geometry (almost 2,000 different volumes) • Altogether less then 8000 lines including field parameterization , easy to read • No step routine is needed in most of the detectors, no “if statement” problem

  8. GSTAR performance • Fast enough - 30 min/10,000 particles, with a general 1 MeV cuts • Calorimeter cuts tuned with test beam date down to 50 KeV • Interfaced to all event generators • Robust and well debugged production tool

  9. Requirements for rOOt interface • Flexible, expandable access to geometry objects from reconstruction program • Modern visualization and navigation • Access to hits from a C++ code as if they were normal C++ objects • fun, and even more fun

  10. New elements • Initially missing elements • Geometry navigator - trivial • Geometry decoder - not so trivial, but feasible • Volumes and positions separately - TVolume • Volumes as position container - TDataset • Hit navigator - trivial • Hit presenter - StGeantHits

  11. G3 geometry model TDataset TVolumePosition StGeant TVolume TVolumeView ctor ctor TNode TVolumeView TShape TVolumePosition list

  12. View as in G3

  13. Geant Hit Access Class class TPoints3DABC (from ROOT G3D) GZEBRA StGeantHits3D StGeantHits() ... GetNextHit(Int_t indx) aghitset() aghitget()

  14. OpenGL viewer

  15. Star Event Display

  16. Conclusions • Now we have all this done and working • G3 geometry model used in reconstruction • calibrations and parameter organization • Looking for a G4 interface

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