high-resolution, fast and radiation-hard silicon tracking station
DESCRIPTION
High-resolution, fast and radiation-hard silicon tracking station. STS working group. CBM collaboration meeting March 2005. To do. Status STS. Conceptual design (CDR) First round of simulations (TSR) ITS with 3 pixel planes SIT with 4 equidistant planes, strip technology through out - PowerPoint PPT PresentationTRANSCRIPT
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High-resolution, fast and radiation-hard silicon tracking station
CBM collaboration meeting March 2005
STS working groupSTS working group
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Status STS
Conceptual design (CDR) First round of simulations (TSR)
ITS with 3 pixel planes SIT with 4 equidistant planes,
strip technology through out Design iteration (partly in TSR)
Optimize configuration Include HitProducers in
simulation Physics performance studies for
different physics cases Final design (TDP 2006?!)
Senors/FE chip, module, support+cooling, readout
Technological feasibility (R&D) Full performance simulation
To
do
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Facts after 2nd round of simulations
Beam pipe of 1 cm Ø
Fluence above 1016
Pixel
Strip
Depends strongly on the physics case.
Alternative configurations for
different observables possible.
Only strip sensors for stations 4 to 7 (SIT) if micro2 strips are used close to the
beam!
First 3 stations (ITS) inside the vacuum! Possibly shielded
against good beam vacuum by a foil.
Is this the last word
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Challenging tasks of the tracking station (I)
Micro vertex reconstruction (main task of the ITS) Secondary vertex reconstruction better 50m (z-
coordinate) Extremely high track density
GeV1%09.0
GeV3%8.0
μm10
MeV102
0
0
021
pX
x
pX
xx
X
x
pd
x
Both high resolution Both high resolution andand a respectively a respectively low material budget low material budget are needed.are needed.
D0→K
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D0→K-+
Material budget / plane
I. Vassiliev
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Challenging tasks of the tracking station (II)
Background rejection in low mass dielectron spectroscopy Reconstruction of "incomplete" tracks Needs probably much more redundancy
ee 0 ee
If these are not reconstructed ..
.. those will form a fake open pair
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-electrons are a huge concern
Yield in 1st station: 5/gold ion passing the (1%) target 5000 at frame rates of 10 s and 109 ions/s !?
P. Koczon
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Possible configuration (B-TeV inspired)
Outer section of plane 3 outside the vacuum!
Highest granularity not needed there
Allows using thin vacuum window
Detectors can be moved in two halfs.
Remove sensors from beam area during focusing
Only two different module geometries
Optional for MAPS or Hybrids
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Generic designs for simulation
Hybrid-like Material budget Resolution
MAPS-like Radiation hardness Read-out speed
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MAPS material budget a first assessment by Michael Deveaux
Stacking of sensors due to inactive read-out area
Design VELO (LHCb) inspired
0.29 %
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MAPS R&D
Dense program of chip submission in 2005 MIMOSA 9 → factor 2 lower signal than expected MIMOSA 10 → MIMOSTAR1 first prototype for STAR IT MIMOSA 11 → Various sensor geometries for studying
aspects of radiation tolerance MIMOSA 12 → Multiple charge storage on-pixel,
aspects of capacitor performance MIMOSA 13 → Current readout
faster, better noise immunity
Transfer of one test station to Frankfurt Support R&D efforts starting with MIMOSA11 Aspects of cryogenic operation
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Assessment for GIGATRACKER
NA48: CERN-SPSC-2004-029 (K+→) Concept (only small area needs to be covered)
High rate: 40 MHz / cm2 100 ps time resolution Fluence 4.5 1014 cm2 (12 Mrad) 0.13 m envisaged
http://na48.web.cern.ch/NA48/NA48-3/groups/gigatracker/
x/X0 < 0.6%
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STS working packages
STS
ITS SIT
MAPS Hybrid
Overall configuration
R&D
Module design
R&D
Module design
Sensor design
FEE R&D
Module design
Readout interface
Integration & Infrastructure
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Design optimization
Design Optimization
Mainframe
Algorithms Digitizers
Final configuration
Tracking groups
STS group
MAPSHitProducer
(Michael)
Strip HitProducer
(Valeri)
Physics benchmarks:
Open charm
• i.e. 10.000 D0/run
Low-mass dielectrons
• S/B < 1/5
• ?
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Towards a Design Proposal
Vertex tracker (ITS) Main tracker (SIT)
MAPS fall back Strip
Design optimization Granularity Resolution Configuration
GSI, IReS GSI, IKF Obninsk
Choice of technology Sensor Readout Module/plane design
IReS MSU/MEPHI
R&D IReS, IKF MSU/MEPHI
Infrastructure/Environment
Management