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Straw Detector Simulation with GEANT4

Straw Detector Simulation with GEANT4. Vladimir Volnykh. Konstantine Chkhaberidze. Overview. Straw Geometry (Logic, Versions, Format) Straw Hits (Variables, Writing Format) Other Outputs from Simulation Program Structure in the Framework of GEANT4 Tests Results To Do. Straw Geometry.

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Straw Detector Simulation with GEANT4

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  1. Straw Detector Simulation with GEANT4 Vladimir Volnykh Konstantine Chkhaberidze V. Volnykh K. Chkhaberidze

  2. Overview • Straw Geometry (Logic, Versions, Format) • Straw Hits (Variables, Writing Format) • Other Outputs from Simulation • Program Structure in the Framework of GEANT4 • Tests Results • To Do .. V. Volnykh K. Chkhaberidze

  3. Straw Geometry DoubleLayer 10 cm 113 tube R= 0,48 cm Z= 226,96 cm Full: 1808 channel in each detector • Two versions of shape: • Octagonal • Square Detector: DoubleLayer x 4 NOTE: This is not Final version of detector and geometry could be changed many times V. Volnykh K. Chkhaberidze

  4. Straw Geometry (logics) Detector X 6 Double layer R = 0,48 cm Kapton Vacuum R = 0,475 cm Gas X 452 V Y U X R = 0,15 x 10(-2) cm Tunsgsten In the case of octagonal shape of detector, tubes have different parameters depending on its position in Double Layer V. Volnykh K. Chkhaberidze

  5. Straw Geometry (format, view) Full Spectrometer Geometry we got in Geant3 format from Oleg, then we converted it to Root TGEO format. After this operation we have possibility to use it in GEANT4 program, via the Virtual Geometry Model. So, our geometry describing language is Root TGEO. Square Shape Root ”gGeoManager” visualization DoubleLayer Detector V. Volnykh K. Chkhaberidze

  6. Straw Geometry (format, view) Octagonal Shape Root ”gGeoManager” visualization GEANT4 ”OpenGL” visualization Read Out for Straws with octagonal shape is under development V. Volnykh K. Chkhaberidze

  7. Straw Geometry (view) So, at this moment, we are using Straw Detector with square shape Root ”gGeoManager” visualization The Part of full spectrometer geometry with inserted Straws V. Volnykh K. Chkhaberidze

  8. Straw Hits (variables) Detector Double layer Charged Track X X HIT ! Saved in Root TTree format V. Volnykh K. Chkhaberidze

  9. Other Outputs from Simulation Event Decay Vertices Detectors Pi+ Primary K+ Decay Decay • Tree 2 Writing: At the End of the each Event • Tree 3 Hits • Tree 1 file.root V. Volnykh K. Chkhaberidze

  10. Program Structure in the Framework of GEANT4 na48.root VGM is used DetectorConstruction PhysicsList EM, Hadronic processes are described RunAction Booking and writing TTree Filling TTrees at the end of the each event EventAction TrackingAction Finding primary K+ and Pi+ decays Straw Hits , No SD and Hit classes SteppingAction Class is written by us, for writing variables in root RootHitsCollection V. Volnykh K. Chkhaberidze

  11. Some Results Primary K+ Decay Vertexes: Y~X in cm Pi+ Decay Vertexes: Y~X in cm V. Volnykh K. Chkhaberidze

  12. Detector Hits Track Hit’s Y~X in DET 1, (first look) First Straw Det. V. Volnykh K. Chkhaberidze

  13. To Do ... • Read Out for Straw Detector with octagonal shape • Digitization Program • Reconstruction Program V. Volnykh K. Chkhaberidze

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