The STT Geometry Description in PANDAroot Thanachot Nasawasd 05 - - PowerPoint PPT Presentation

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The STT Geometry Description in PANDAroot Thanachot Nasawasd 05 - - PowerPoint PPT Presentation

May 22, 2023 433 likes •710 views

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.

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Mitglied der Helmholtz-Gemeinschaft

Thanachot Nasawasd

The STT Geometry Description in PANDAroot

05 June 2018

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  • Straw Tube Tracker
  • STT in Pandaroot (curent model)
  • STT modeling
  • I. Tubes
  • II. Straw tube arangment
  • III. Mechanical frame
  • IV. Gas systems
  • Outlooks

Outline

05 June 2018 The STT Geometry Description in PANDAroot

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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

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Straw Tube Tracker (STT)

  • Straw Tubes
  • Mechanical Frame
  • Gas system

05 June 2018 The STT Geometry Description in PANDAroot

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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

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  • I. Tubes
  • II. Straw tube arangment
  • III. Mechanical Frame
  • IV. Gas system

STT Modeling

05 June 2018 The STT Geometry Description in PANDAroot

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  • I. Tube

STT Modeling: Tube

  • Film tube
  • End plug
  • Electric contact
  • Wire
  • Crimp pin
  • Fixation ring
  • Gases

~ 10 mm

Tube in PANDAroot The prototype

05 June 2018 The STT Geometry Description in PANDAroot

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Film tube The thin Mylar layer (27 um) is coated with AL (0.03 um) Wire Crimp pin The wire is made from a gold-plated tungsten-rhenium

  • Ignore the coated gold layer

The crimp pin is made of copper, holding the wire

STT Modeling: Tube

05 June 2018 The STT Geometry Description in PANDAroot

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  • Fixation ring

End plug End plug is made from Acrylonitrile butadiene styrene(ABS).

  • In the simulation we use the sharp edges instead of smooth edges.

Fixation ring is made from PVC.

STT Modeling: Tube

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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.

STT Modeling: Tube

05 June 2018 The STT Geometry Description in PANDAroot

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  • Gases

Mixed gases Ar 90% / CO2 10%

STT Modeling: Tube

05 June 2018 The STT Geometry Description in PANDAroot 05 June 2018 The STT Geometry Description in PANDAroot

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  • II. Straw tube arangment

STT Modeling: Straw tube arrangement

~410

  • The STT detector consists of 4576 tubes arranged in 29 layers.

29 layers ~160

05 June 2018 The STT Geometry Description in PANDAroot

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Parallel straw

STT Modeling: Straw tube arrangement

  • The straw are skewed relative to

the aligned straws in the same sector by a small angle of +2.9 ◦ and −2.9 ◦.

  • The straw are parallel with the

beam axis, to detect radial positions. Skewed straw

05 June 2018 The STT Geometry Description in PANDAroot

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Tubes Length

1400 mm

1185 mm 985 mm 785 mm 385 mm 785 mm 585 mm 185 mm

The border region of each skewed layer

STT Modeling: Straw tube arrangement

05 June 2018 The STT Geometry Description in PANDAroot

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STT Modeling: Straw tube arrangement

1 2 3 4 5 6 Group 1-6

05 June 2018 The STT Geometry Description in PANDAroot

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STT Modeling: Straw tube arrangement

1 2 3 4 5 6 Sector 1 Sector 2 Flip

05 June 2018 The STT Geometry Description in PANDAroot

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STT Modeling: Straw tube arrangement

s1 s2 s3 s4 s5 s6 s1 s2 s3 s4 s5 s6 1 2

05 June 2018 The STT Geometry Description in PANDAroot

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  • III. Mechanical Frame
  • In PANDAroot
  • Model
  • Prototype

05 June 2018 The STT Geometry Description in PANDAroot

STT Modeling: Mechanical Frame

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  • III. Mechanical Frame
  • Stainless Frame
  • Gas pipe holder
  • Carbon-fiber tube

05 June 2018 The STT Geometry Description in PANDAroot

STT Modeling: Mechanical Frame

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Stainless Frame

  • In PANDAroot
  • Model

Complicated shape Smooth edges

05 June 2018 The STT Geometry Description in PANDAroot

STT Modeling: Mechanical Frame

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Gas pipe holder

Stainless ABS plastic

Smooth edge

  • In PANDAroot
  • Model

05 June 2018 The STT Geometry Description in PANDAroot

STT Modeling: Mechanical Frame

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  • 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

STT Modeling: Mechanical Frame

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  • IV. The gas system

Stainless-steel pipe Thermoplastic tubes (capillaries) *** Thermoplastic tubes are connected to the individual straws.

  • In PANDAroot

05 June 2018 The STT Geometry Description in PANDAroot

STT Modeling: The gas system

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  • IV. The gas system

4 mm

  • Stainless-steel pipe

Curved pipe

  • Model
  • In PANDAroot

05 June 2018 The STT Geometry Description in PANDAroot

STT Modeling: The gas system

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  • 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

STT Modeling: The gas system

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Outlooks

Digitization

  • Straw number
  • ADC deposit energy
  • Time Over Threshold
  • Waveform

Local Reconstruction

  • Position
  • Energy
  • Time

05 June 2018 The STT Geometry Description in PANDAroot 05 June 2018 The STT Geometry Description in PANDAroot