1 HEP2005, Lisboa 21-27 July 05 Roberto Campagnolo - CERN HEP2005 International Europhysics Conference on High Energy Physics HEP2005 International Europhysics Conference on High Energy Physics ( Lisboa-Portugal, 21-27 July 2005 ) ( Lisboa-Portugal, 21-27 July 2005 ) Readout Electronics for the ALICE Time Projection Chamber Readout Electronics for the ALICE Time Projection Chamber Roberto Campagnolo – CERN PH-ED Outline: Outline: • The ALICE TPC FEE Design Requirements • Overview of the main Components • Measurements • Conclusions
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HEP2005, Lisboa 21-27 July 05 Roberto Campagnolo - CERN 1 HEP2005 International Europhysics Conference on High Energy Physics ( Lisboa-Portugal, 21-27.
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1HEP2005, Lisboa 21-27 July 05 Roberto Campagnolo - CERN
HEP2005 International Europhysics Conference on High Energy PhysicsHEP2005 International Europhysics Conference on High Energy Physics
( Lisboa-Portugal, 21-27 July 2005 )( Lisboa-Portugal, 21-27 July 2005 )
Readout Electronics for the ALICE Time Projection ChamberReadout Electronics for the ALICE Time Projection Chamber
Roberto Campagnolo – CERN PH-ED
Outline:Outline:
• The ALICE TPC FEE Design Requirements
• Overview of the main Components
• Measurements
• Conclusions
2HEP2005, Lisboa 21-27 July 05 Roberto Campagnolo - CERN
510 cm
EE
88μs
400 V / cm
The ALICE Time Projection Chamber layout
GAS VOLUME: 88 m3
90% Ne - 10%CO2
114556 cm
LARGE DATA VOLUME :
• 570 132 (pads) x 1000 (time bins)
• 712 Mbytes / event
• Pb – Pb (@200 Hz) 142 Gbyte / s
• p-p (@1KHz) 712 GByte / s
READOUT PLANE SEGMENTATION :
18 trapezoidal sectors per side
each covering 20 degrees in azimuth
3HEP2005, Lisboa 21-27 July 05 Roberto Campagnolo - CERN
Tail Cancellation Filter and Moving Average Filter effects
High Multiplicity Event in Field Cage Prototype( 5500 FEE channels )
Typical Pulse shape
11HEP2005, Lisboa 21-27 July 05 Roberto Campagnolo - CERN
The ALICE TPC is readout with an innovative electronics with on-detector digital signal processing.
Test performed on a sizeable fraction of the final electronics show that the system fulfills all requirements, in particular:
- Power consumption : 40mW/ch
- System Noise ~ 730 e-
- Baseline restoration at 1 ‰ of the Dynamic Range within 1 μs
Production and test of components is on schedule for the start installation in Fall 2005 and detector commissioning in Spring 2006
Conclusions
12HEP2005, Lisboa 21-27 July 05 Roberto Campagnolo - CERN
End of presentation
13HEP2005, Lisboa 21-27 July 05 Roberto Campagnolo - CERN
Digital Conditioning of the TPC signal
INPUT SIGNAL AFTER 1st BASELINE CORRECTION
AFTER TAIL CANCELLATION AFTER 2nd BASELINE CORRECTION
14HEP2005, Lisboa 21-27 July 05 Roberto Campagnolo - CERN
Single Event Functional Interrupts with Xilinx Virtex-II Pro FPGA
( Reconfiguration started after 200 seconds, errors are then continuously detected and corrected )
• Test conditions– Flux = 3.7 x 1011 protons/cm2/s– Reconfiguration time = 5 s
• Real life– Flux = 7.9 x 102 hadrons/cm2/s– Reconfiguration time = 10 ms
• Duty cycle: 1011 times better in real life
Readout Control Unit – Xilinx FPGA radiation tests
15HEP2005, Lisboa 21-27 July 05 Roberto Campagnolo - CERN
Integration with the DetectorConfiguration for the Test-Beam (May 2004) and Cosmic Rays (2005)
IROC in Field Cage prototype readout with:
43 FECs ( 5500 channels , ~1 % of Alice TPC ) connected to2 RCUs by4 branches of ALTRO readout backplanes.2 DCS boards interfaced to the RCUs and connected to the TTC, 2 SIUs for the DDL‘Realistic’ Power supply distribution: Wiener500 with 40 m. cables