Field Cage Simulation Study for Prototype Cherenkov TPC Michael Phipps, Bob Azmoun, and Craig Woody.

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Presentation transcript:

Field Cage Simulation Study for Prototype Cherenkov TPC Michael Phipps, Bob Azmoun, and Craig Woody

Cherenkov TPC Update Field cage ordered Candidate gas studies completed: 80 Ne/10 CH4/10 CO2 85 Ne/10 CH4/5 CO2 85 Ne/5 CH4/10 CO2 TPC chevron readout board analysis … 4 designs w/ 2 mm pitch Fine/coarse chevrons Fine/coarse floating strip chevrons Field cage simulation studies … both readout modes: TPC Combined Cherenkov TPC Prototype construction begins this fall at BNL

Field Cage Design Dimensions: x x mm Strip insulation: 2 mm thick kapton foil Strips: Mirrored layers of 26 inner/outer strips on either side of kapton Strip details: 25 full strips of 3.9 mm length; 1 half strip of 1.9 mm length; Strip spacing: 0.1 mm strip spacing Removable fourth wall: to allow for two modes of testing (TPC or Cherenkov TPC) Top bottom electrodes: Copper top plate; bottom TPC readout: mesh, triple GEM and readout board Field Cage Simulation Geometry Simulation software: ANSYS Multiphysics Dimensions: Same with no mesh or GEM stack or readout components Strips: Same. 26 mirrored inner/outer strips with kapton insulation Strip spacing: Approximated to mm to limit problem size Material attributes: electrodes: ~infinite permittivity; gas: 1.0 permittivity; kapton: 3.5 permittivity Field Cage Simulation Meshing Finite element method Ansys simulation Element shape: 3d tetrahedral Nodes: 4/element Meshing size: very fine element sides along electrode strips/spacing where there’s a lot of detail; coarse mesh in large homogenous regions (gas/top and bottom electrodes)

Preliminary proof-of-concept results from ANSYS simulations Note: 2 Scenarios initially tested: Parallel Plates (144 mm long) at distance of 110 mm 4 field cage walls of strips (144 mm) with NO parallel plates

Parallel Plate Field Map (No Strips) Distance: ~110 mm; Length: ~144 mm 4 Sides of Strips; No Parallel Plates EF Sum ANSYS Contour Plots of Absolute Field EF Sum ROOT COLZ Plots of Percent Discrepancy Of Field Strength DIFFERENT SCALES! Axes Rotated!

Preliminary results from ANSYS simulations of TPC field cage Note: Cherenkov component not included (All 4 stripped walls symmetric) Strip spacing approximated due to simulation memory requirements Scenario: 3 different strip spacing 0.5 mm spacing 1.0 mm spacing 1.5 mm spacing

0.5 mm Strip Spacing: Scale mm Strip Spacing: Scale 11.0 mm Strip Spacing: Scale mm Strip Spacing: Scale 21.0 mm Strip Spacing: Scale 21.5 mm Strip Spacing: Scale 2

Preliminary results from ANSYS simulations of Cherenkov TPC field cage Note: Geometry: 3 planes of strips w/ 1 wire plane Wire plane: 52 wires of 0.5 mm diameter (wires in real design ~0.2 mm diameter) Wire shape: Approximated using block volumes Strip spacing: Approximated to 1.0 mm Scenario tested: 4 walls of strips vs. 3 walls of strips + 1 wall of wires

TPC Cherenkov Geometry

TPC + Cherenkov: Scale 1 (3 strip planes; 1 wire plane) TPC + Cherenkov: Scale 2 (3 strip planes; 1 wire plane) TPC: Scale 1 (4 strip planes) Wire Plane