Evgeny Kryshen (PNPI) Mikhail Ryzhinskiy (SPbSPU) Vladimir Nikulin (PNPI) Detailed geometry of MUCH Detailed geometry of MUCH detector detector in cbmroot in cbmroot Outline Motivation Realistic module design Implementation in cbmroot New segmentation algorithm Occupancy study Visual display for MUCH Supported from INTAS project 05- 103-7484
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Evgeny Kryshen (PNPI) Mikhail Ryzhinskiy (SPbSPU) Vladimir Nikulin (PNPI) Detailed geometry of MUCH detector in cbmroot Outline Motivation Realistic module.
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Evgeny Kryshen (PNPI)
Mikhail Ryzhinskiy (SPbSPU)
Vladimir Nikulin (PNPI)
Detailed geometry of MUCH detector Detailed geometry of MUCH detector in cbmrootin cbmroot
Outline
Motivation Realistic module design Implementation in cbmroot New segmentation algorithm Occupancy study Visual display for MUCH
Supported from INTAS project 05-103-7484
Currently used geometryCurrently used geometry
Evgeny Kryshen CBM collaboration meeting, 27 February 2008
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• Stations are simulated as simple shapes – 3mm disks filled with argon gas
• Distances between layers and absorbers are not realistic (too small)
• No support structures, no module design
• Segmentation algorithm is not flexible
• Parameter files are huge, full of irrelevant numbers, hardly readable, not flexible
• Geometry and segmentation parameters are described in different files
Module design in ALICEModule design in ALICE
Evgeny Kryshen CBM collaboration meeting, 27 February 2008
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Schematic layout of GEM moduleSchematic layout of GEM module
Evgeny Kryshen CBM collaboration meeting, 27 February 2008
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Support structure
PadsPads
FastenersFasteners
SpacerSpacer
PCBPCB Readout electronicsReadout electronics
ArgonArgon
GEM foilsGEM foils
Implementation of module designImplementation of module design
Evgeny Kryshen CBM collaboration meeting, 27 February 2008
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Front side Back side
Layers:
Modules are arranged in rows on both sides of each layer
There is an overlap of active volumes to avoid dead zones in y direction
Overlap
Support structures and modulesSupport structures and modules
Evgeny Kryshen CBM collaboration meeting, 27 February 2008
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Support structures:
Each support structure is composed of two parts to assure easy installation around the pipe
Estimated thickness ~ 1.5 cm
Material: carbon plastics (ρ = 0.1 ρC)
Implemented as composite shapes in cbmroot
Y spacersY spacers
Active volumeActive volume
X spacersX spacers Module:
Module size is mostly restricted by the GEM foil production technology (up to 60 x 60 cm with the new machine at CERN)
Active volume: 30 x 30 cm x 0.3 cm, argon
Spacers: 5 cm in y, 0.5 cm in x; material: noryl, implemented as composite shapes
Active volume implemented as TGeoBox for simple modules and as composite shapes for modules with a hole
Detailed geometry: general viewDetailed geometry: general view
Evgeny Kryshen CBM collaboration meeting, 27 February 2008
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• Two layers at each station
• Three layers at the last trigger station
• Modules are automatically located on the surface of support structures
• Cables, gas tubes, PCBs and front-end electronics are neglected at the moment
Evgeny Kryshen CBM collaboration meeting, 27 February 2008
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# General informationMuchCave Zin position [cm] : 105Acceptance tangent min : 0.1Acceptance tangent max : 0.5Number of absorbers : 6Number of stations : 6
# Absorber specificationAbsorber Zin position [cm] : 0 38 76 114 162 215Absorber thickness [cm] : 20 20 20 30 35 100Absorber material : I I I I I I
# Station specificationStation Zcenter [cm] : 29 67 105 151 206 327.5Number of layers : 2 2 2 2 2 3Detector type : 1 1 1 1 1 1Distance between layers [cm]: 7 7 7 7 7 7Support thickness [cm] : 1.5 1.5 1.5 1.5 1.5 1.5Sigma X minimum [cm] : 0.04 0.04 0.04 0.04 0.04 0.04Sigma Y minimum [cm] : 0.04 0.04 0.04 0.04 0.04 0.04Sigma X maximum [cm] : 0.32 0.32 0.32 0.32 0.32 0.32Sigma Y maximum [cm] : 0.32 0.32 0.32 0.32 0.32 0.32Maximum occupancy : 0.05 0.05 0.05 0.05 0.05 0.05