Straw Detector Simulation with GEANT 4 Vladimir Volnykh

Overview • Straw Geometry (Logic, Versions, Format) • Straw Hits (Variables, Writing Format) •

Straw Geometry Double. Layer 113 tube 10 cm R= 0, 48 cm Z= 226,

Straw Geometry (logics) Detector X 6 Double layer Vacuum R = 0, 48 cm

Straw Geometry (format, view) Full Spectrometer Geometry we got in Geant 3 format from

Straw Geometry (format, view) Octagonal Shape Root ”g. Geo. Manager” visualization GEANT 4 ”Open.

Straw Geometry (view) So, at this moment, we are using Straw Detector with square

Straw Hits (variables) Detector Double layer Charged Track X X HIT ! Det N

Other Outputs from Simulation Event Decay Vertices Primary K+ Detectors Pi+ Decay • Tree

Program Structure in the Framework of GEANT 4 Detector. Construction na 48. root VGM

Some Results Primary K+ Decay Vertexes: Y~X in cm Pi+ Decay Vertexes: Y~X in

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

To Do. . . • Read Out for Straw Detector with octagonal shape •

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Straw Detector Simulation with GEANT 4 Vladimir Volnykh Konstantine Chkhaberidze V. Volnykh K. Chkhaberidze

Overview • Straw Geometry (Logic, Versions, Format) • Straw Hits (Variables, Writing Format) • Other Outputs from Simulation • Program Structure in the Framework of GEANT 4 • Tests Results • To Do. . V. Volnykh K. Chkhaberidze

Straw Geometry Double. Layer 113 tube 10 cm R= 0, 48 cm Z= 226, 96 cm Full: 1808 channel in each detector Two versions of shape: 1. Octagonal Detector: Double. Layer x 4 2. Square NOTE: This is not Final version of detector and geometry could be changed many times V. Volnykh K. Chkhaberidze 3

Straw Geometry (logics) Detector X 6 Double layer Vacuum R = 0, 48 cm Kapton R = 0, 475 cm Gas X Y U V X 452 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

Straw Geometry (format, view) Full Spectrometer Geometry we got in Geant 3 format from Oleg, then we converted it to Root TGEO format. After this operation we have possibility to use it in GEANT 4 program, via the Virtual Geometry Model. So, our geometry describing language is Root TGEO. Square Shape Root ”g. Geo. Manager” visualization Double. Layer Detector V. Volnykh K. Chkhaberidze 5

Straw Geometry (format, view) Octagonal Shape Root ”g. Geo. Manager” visualization GEANT 4 ”Open. GL” visualization Read Out for Straws with octagonal shape is under development V. Volnykh K. Chkhaberidze 6

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

Straw Hits (variables) Detector Double layer Charged Track X X HIT ! Det N DBL N Str N Tr - ID Tr. P - ID Ev - ID W. - X W. - Y W. - Z Px Py Pz G Tme Point ID Saved in Root TTree format V. Volnykh K. Chkhaberidze 8

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

Program Structure in the Framework of GEANT 4 Detector. Construction na 48. root VGM is used Physics. List EM, Hadronic processes are described Run. Action Booking and writing TTree Event. Action Filling TTrees at the end of the each event Tracking. Action Finding primary K+ and Pi+ decays Stepping. Action Straw Hits , No SD and Hit classes Root. Hits. Collection Class is written by us, for writing variables in root V. Volnykh K. Chkhaberidze

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

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

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