STAR silicon tracking detectors SVT and SSD
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Transcript of STAR silicon tracking detectors SVT and SSD
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[email protected] CBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 1
STAR silicon tracking detectorsSVT and SSD
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[email protected] CBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 2
Summary of the talk
• Few words about STAR experiment and SVT
• Design of the SSD and its elements
• Ladder and barrel assembly
• Installation
• Improvement for ALICE ITS
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[email protected] CBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 3
• Few words about STAR experiment and SVT• Design of the SSD and its elements• Ladder and barrel assembly• Installation • Improvement for ALICE ITS
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Collision of two gold beams
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STAR detector
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Average radiation length : 4.5%X0 incl. fee cards
SVT Design
3 Barrels :• Inner at 6 cm
•8 ladders – 4 wafers/ladder• Middle at 10 cm
•12 ladders – 6 wafers/ladder• Outer barrel at 15 cm
•16 ladders – 7 wafers/ladder
Length : 42 cm216 wafers
waferFEE
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SVT installation in summer 2001
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[email protected] CBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 8
• Few words about STAR experiment and SVT
• Design of the SSD and its elements
• Ladder and barrel assembly
• Installation
• Improvement for ALICE ITS
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Silicon Strip Detector
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The purposes of the SSD
• To enhance the STAR tracking performances due to its position resolution and its dE/dx capabilities.
• To facilitate the connection of the TPC tracks and the hits in the SVT, being closer to the TPC.
• To improve the tracking efficiency in the central region especially in the low momentum domain and for secondary particles.
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[email protected] CBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 11
The SSD for STAR
20 ladders16 modules per ladder491520 analogue channels1 square meter of double sided waferRadiation length : 1.1% X0Length : 1mDiameter : 46 cm
z = 740 m
r = 20 m
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SSD Ladder
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Design of the module
Silicon Wafer
TAB
Hybrid Circuit
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Design of the silicon wafer
Double sidedStereoscopic angle : 35 mradThickness : 300 umActive area : 40 mm x 73 mm768 strips per side Pitch : 95 umN strip insulation : P sprayBiasing scheme : punch-throughOperating voltage : < 50VMarks for positionningManufacturer : Eurisys
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Readout chip : ALICE128C60
00µ
m
8700µm
Specifications :
• AMS 1.2 um
•Input range : 13 MIPs
•Gain : 50mV/MIP
•340 uW/channel
•Noise : 290 e- + 8 e-/pF
•JTAG controlled
•Internal pulse generator
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TAB tape
This technique has multiple advantages :• handling of the chips is easy, • test is possible in realistic conditions •Flexibility allowing 3D connection•Pitch adaptor•Industrial standard
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ALICE128C on a TAB tape
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Module production flow
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Detection Module
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Detection Module
464 modules produced with a yield of 82%
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SSD performances
S/N – Pside = 30
S/N – Nside = 20
Digital resolution :
•20 μm in transverse plane
•740 μm in Z axis
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Carbon frame
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Ladder cables and connection
3M Z-Axis Adhesive Films
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30 MHzBLVDS bus
Readout chain
One Readout boardReadout board :•Interface of the barrel to Slow control, Trigger and DAQ•Located on the TPC wheel
Ribbon cable (1m)
shielded cable (2m)
3 MHzon a ladder
10 ADC+C2D2 boards
16 modules (P or N side)
C2D2 board :• Interface modules/ADC board (analogue signal multiplexed)• reference voltage• Temperature measurement• Latch-up control• Bypass module, zero filling instead• Technology : board-Flex-board
ADC boards :• interface Readout boards/ladder• power supply distribution•Analogue to digital conversion
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SSD cooling system : principle
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SSD Cooling system : measurement results
10 W
3 W
3 W
33.1oC
33.7oC
27.6oC
33.2oC
30.7oC 24.5oC
25.1oC
30.9 oC
27.8 oC
19oC
29oC
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Power supply of one ladder
4 amperes fuse
CAEN A525 power supply
+2V 0V
CAEN A525 power supply
+2V 0V
CAEN A515 power supply
0V 35V
CAEN A525 power supply
0V +2V
CAEN A525 power supply
0V +2V
CAEN A516 power supply
+5V 0V
CAEN A516 power supply
0V +5V
Detector
Front end electronics
Front end electronics
ADC Boards Connection Board
+35V 0V
0V +2V -2V +35V +37V +33V
+2V 0V 0V -2V
0V
-2V
+3V
+37V
+35V
+35V +33V
+35V +33V +38V
ADC Boards Connection Board
16
JWS300-12 power supply
+ 7 V 0V
+7V
0V
JWS300-12 power supply
0V 7V
+7V
0V Readout Board
Readout Board 0V
0V +35V
+5V
0V
+5V
One ladder
P side low voltage power supply (floating) N side low voltage power supply (floating)
Biasing voltage
Power supply of the readout board and the non floating part of the ADC board
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[email protected] CBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 28
• Few words about STAR experiment and SVT
• Design of the SSD and its elements
• Ladder and barrel assembly
• Installation
• Improvement for ALICE ITS
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Ladder assembly flow
One ladder /week• 3 persons• First ladder : 3 weeks• 3 last ladders in 1 week (5 persons)
Ladder frames
Module placing on the assembly bench
Visual inspection
Placing and gluing the carbon ladder on top
of the modules
Soldering of the cables to the module
Functional and Noise test
Ladder cables
Visual inspectionElectrical test
Packaging and storage until barrel assembly
Modules
Visual inspectionNoise test
ADC & C2D2 boards
Visual inspectionElectrical test
Ladder pre-assembly
Functional and Noise test
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Ladder assembly
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Ladder views
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Sector assembly
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One sector
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SSD database
You can visit it at :
http://wwwstar-sbg.in2p3.fr/index.php
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[email protected] CBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 35
• Few words about STAR experiment and SVT
• Design of the SSD and its elements
• Ladder and barrel assembly
• Installation
• Improvement for ALICE ITS
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[email protected] CBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 36
SSD installation
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Milestones of the project
• Design started in 1997
• Technical proposal approved in 1998 by STAR
• Five modules prototypes in 2000
• First ladder produced and installed in 2002
• first half installed summer 2003
• Installation completed in summer 2004
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[email protected] CBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 38
• Few words about STAR experiment and SVT
• Design of the SSD and its elements
• Ladder and barrel assembly
• Installation
• Improvement for ALICE ITS
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Semi-automatic assembly bench
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Graphic user interface
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Soldering bench
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ENDThank you