Mitglied der Helmholtz-Gemeinschaft The STT Geometry Description in PANDAroot Thanachot Nasawasd 05 June 2018
Outline Straw Tube Tracker ● STT in Pandaroot (curent model) ● STT modeling ● I. Tubes II. Straw tube arangment III. Mechanical frame IV. Gas systems • Outlooks 05 June 2018 The STT Geometry Description in PANDAroot 2
Straw Tube Tracker (STT) STT measure the particle momentum from the reconstructed trajectory and the specific energy loss of the particles 05 June 2018 The STT Geometry Description in PANDAroot 3
Straw Tube Tracker (STT) ● Straw Tubes ● Mechanical Frame ● Gas system 05 June 2018 The STT Geometry Description in PANDAroot 4
STT in PANDAroot: curent model ● Gases in cylindrical shape ● Wires Differences from real STT ● Tube wall and end-caps ● Mechanical frame ● Gas system ● Tube arrangement 05 June 2018 The STT Geometry Description in PANDAroot 5
STT Modeling I. Tubes II. Straw tube arangment III. Mechanical Frame IV. Gas system 05 June 2018 The STT Geometry Description in PANDAroot 6
STT Modeling: Tube I. Tube ● Film tube Tube in PANDAroot ● End plug ~ 10 mm ● Electric contact ● Wire The prototype ● Crimp pin ● Fixation ring ● Gases 05 June 2018 The STT Geometry Description in PANDAroot 7
STT Modeling: Tube Wire Film tube The wire is made from a gold-plated tungsten-rhenium - Ignore the coated gold layer Crimp pin The thin Mylar layer (27 um) is coated with AL (0.03 um) The crimp pin is made of copper, holding the wire 05 June 2018 The STT Geometry Description in PANDAroot 8
STT Modeling: Tube End plug ● Fixation ring End plug is made from Acrylonitrile butadiene styrene(ABS). Fixation ring is made from PVC. ● In the simulation we use the sharp edges instead of smooth edges. 9
STT Modeling: Tube Electric contact ● Electric contact is made from a gold-plated copper-beryllium. ● In PANDAroot we use a ring shape instead of spring and ignore the coated gold layer. 05 June 2018 The STT Geometry Description in PANDAroot 10
STT Modeling: Tube ● Gases Mixed gases Ar 90% / CO 2 10% 05 June 2018 05 June 2018 The STT Geometry Description in PANDAroot The STT Geometry Description in PANDAroot 11
STT Modeling: Straw tube arrangement II. Straw tube arangment ~410 ~160 29 layers ● The STT detector consists of 4576 tubes arranged in 29 layers. 05 June 2018 The STT Geometry Description in PANDAroot 12
STT Modeling: Straw tube arrangement Parallel straw Skewed straw ● The straw are skewed relative to ● The straw are parallel with the the aligned straws in the same beam axis, to detect radial sector by a small angle of +2.9 ◦ positions. and −2.9 ◦. 05 June 2018 The STT Geometry Description in PANDAroot 13
STT Modeling: Straw tube arrangement Tubes Length 1400 mm 1185 mm The border region of each skewed layer 985 mm 785 mm 785 mm 585 mm 385 mm 185 mm 05 June 2018 The STT Geometry Description in PANDAroot 14
STT Modeling: Straw tube arrangement Group 1-6 1 6 2 5 3 4 05 June 2018 The STT Geometry Description in PANDAroot 15
STT Modeling: Straw tube arrangement Flip Sector 2 Sector 1 1 6 2 5 3 4 05 June 2018 The STT Geometry Description in PANDAroot 16
STT Modeling: Straw tube arrangement s6 s5 1 s4 s3 s2 s1 s6 s5 s4 s3 s2 s1 2 05 June 2018 The STT Geometry Description in PANDAroot 17
STT Modeling: Mechanical Frame III. Mechanical Frame ● Model ● Prototype ● In PANDAroot 05 June 2018 The STT Geometry Description in PANDAroot 18
STT Modeling: Mechanical Frame ● Stainless Frame III. Mechanical Frame ● Gas pipe holder ● Carbon-fiber tube 05 June 2018 The STT Geometry Description in PANDAroot 19
STT Modeling: Mechanical Frame Stainless Frame Complicated shape Smooth edges ● Model ● In PANDAroot 05 June 2018 The STT Geometry Description in PANDAroot 20
STT Modeling: Mechanical Frame Smooth edge ● Model Gas pipe holder ● In PANDAroot Stainless ABS plastic 05 June 2018 The STT Geometry Description in PANDAroot 21
STT Modeling: Mechanical Frame ● The inner and outer surfaces of STT will be covered by a composite material, consisting of a 1 mm Rohacell layer with a 0.17 mm carbon fiber. 05 June 2018 The STT Geometry Description in PANDAroot 22
STT Modeling: The gas system IV. The gas system ● In PANDAroot Stainless-steel pipe *** Thermoplastic tubes are connected Thermoplastic tubes to the individual straws. (capillaries) 05 June 2018 The STT Geometry Description in PANDAroot 23
STT Modeling: The gas system ● In PANDAroot IV. The gas system ● Model Curved pipe 4 mm ● Stainless-steel pipe 05 June 2018 The STT Geometry Description in PANDAroot 24
STT Modeling: The gas system IV. The gas system ● We use the plate shape instead of the small thermoplastic tubes. Thermoplastic tubes in PANDAroot 05 June 2018 The STT Geometry Description in PANDAroot 25
Outlooks Digitization - Straw number - ADC deposit energy - Time Over Threshold - Waveform Local Reconstruction - Position - Energy - Time 05 June 2018 05 June 2018 The STT Geometry Description in PANDAroot The STT Geometry Description in PANDAroot 26
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