IST group

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IST group
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The IST project
Gerrit van Nieuwenhuizen BNL-DAC review Jan 30,
2007
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Requirements
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Technology choice
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IST in STAR
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Conceptual layout
SSD
HFT
Exoskeleton
IST
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The tracking layers
SSD at r23cm
HFT at r2.5cm and r7cm
Exoskeleton at r8.5cm
Inner IST at r12cm
Outer IST at r17cm
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IST design
R 17 cm 27 ladders 13 units per ladder
R 12 cm 19 ladders 10 units per ladder
Simulations Realistic ladders Realistic
support Realistic cables No utilities yet
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IST sensors
640 strips 60um pitch
Silicon Pad
Silicon Strip
32 x 20 pads 1.2 x 1.92 mm
For the readout the pad sensors are identical to
the strip sensors 640 ch.
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Expected particle densities
Simulations
Hand calculation
Occupancy
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1
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Ambiguous hits
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Fraction of ambiguous hits
Simulations
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4
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Probability of finding right hit
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Pointing to HFT with/without pads
With strips and pads
With strips and no pads
With half-strips and no pads
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Detail IST module
APV25-S1
0.77
100um Kapton Hybrid
0.10
Silicon Sensor
0.32
0.10
Thermal conducting carbon foam
Silicon Sensor
0.32
100um Kapton Hybrid
0.10
0.77
Investigating air cooling
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The APV25-S1 readout chip
- developed for CMS - 75000 in CMS tracker - 128
channels - 40 Mhz sample rate - 4 us analogue
pipeline - lt 2000 e ENC - 111 signal/noise -
0.25 Watt/chip - 0.25 um CMOS - rad hard - SEU
resilient
To be used in IST, FST, FGT -gt 1 readout!
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Material budget IST
3.5 X
0
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IST prototype
PHOBOS Type 1
Kapton Cable/Hybrid
APV25-S1
Test functionality Study heat transfer (1.5
Watt) Start building in February 2007
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IST prototype cable
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IST readout system
Readout design Miro Plesko STAR-DAQ Dave
Underwood
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TUP integrated mechanics
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TUP integrated mechanics
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Material budget SVT
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Cost estimate
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IST budget breakdown
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Resources
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Requirements (version A)
h
Location between HFT and SSD, covering -1lt
lt1 Occupancy lt 10 for central AuAu _at_ 200
GeV Material budget lt 4.5 X (existing SVT),
lt 1.5 X per layer Pointing accuracy to HFT
lt 410 m for RHICII luminosity Tracking
efficiency/purity should meet physics
demands Vertex resolution resolve B decays in
pp _at_ 500 GeV Sampling speed resolve individual
beam bunches Rate capability handle RHICII peak
luminosities for AuAu and pp
o
o
m
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Requirements (version B)
-1 lt ? lt 1
- Fits in between HFT and SSD - Material budget
1.5 X per layer - Resolve individual beam
bunches (213 ns) - Handles RHIC II luminosities
(AA 90 10 cm s, pp 4 10 cm s
) - Handles central 200 GeV AuAu occupancy
(1 particles per cm at first layer) - Minimize
hit ambiguities, i.e. ghosts - Good pointing
accuracy to HFT (? 410 ?m for RHICII AA
luminosity) - Good vertex resolution for 500 GeV
pp
o
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-2
-1
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-2
-1
.
.
2