Straw Detector Simulation with GEANT4
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Transcript of Straw Detector Simulation with GEANT4
V. Volnykh K. Chkhaberidze 1
Straw Detector Simulation with GEANT4
Vladimir Volnykh Konstantine Chkhaberidze
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• 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 ..
Overview
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Straw Geometry
113 tube 10 cm
Full: 1808 channel in each detector
R= 0,48 cmZ= 226,96 cm
Two versions of shape:
1. Octagonal
2. Square
DoubleLayer
Detector: DoubleLayer x 4
NOTE: This is not Final version of detector and geometry could be changed many times
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R = 0,48 cm Kapton
R = 0,475 cm Gas
R = 0,15 x 10(-2) cm Tunsgsten
X 452
Double layerDetector
In the case of octagonal shape of detector, tubes have different parameters depending on its position in Double Layer
X 6
X
Y U V
Vacuum
Straw Geometry (logics)
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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.
Straw Geometry (format, view)
Square Shape
DoubleLayer Detector
Root ”gGeoManager” visualization
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Straw Geometry (format, view)Octagonal Shape
Root ”gGeoManager” visualization
GEANT4 ”OpenGL” visualization
Read Out for Straws with octagonal shape is under development
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Straw Geometry (view)So, at this moment, we are using Straw Detector with square
shape
The Part of full spectrometer geometry
with inserted Straws
Root ”gGeoManager” visualization
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Straw Hits (variables)
X X
HIT !
Charged Track
Double layer
Detector
Det N DBL N Str N Tr - ID TrP - ID Ev - ID W. - X W. - Y W. - Z P x P y P z G Tme Point ID
Saved in Root TTree format
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Other Outputs from Simulation Event
Primary K+ Pi+
Decay Vertices
Decay
Decay
Hits
file.root
•Tree 2
•Tree 3
•Tree 1
Detectors
Writing: At the End of the each Event
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Program Structure in the Framework of GEANT4
DetectorConstruction na48.root VGM is used
PhysicsList
EventAction
TrackingAction
SteppingAction
RunAction
RootHitsCollection
Booking and writing TTree
Filling TTrees at the end of the each event
Finding primary K+ and Pi+ decaysStraw Hits , No SD and Hit classesClass is written by us, for writing
variables in root
EM, Hadronic processes are described
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Some Results
Primary K+ Decay Vertexes: Y~X in cm
Pi+ Decay Vertexes: Y~X in cm
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Detector Hits
First Straw Det.
Track Hit’s Y~X in DET 1, (first look)
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To Do ...
• Read Out for Straw Detector with octagonal shape
• Digitization Program
• Reconstruction Program