1 L0 Calorimeter Trigger LHCb Bologna CSN1 Assisi, 22/9/04 U. Marconi INFN Sezione di Bologna

2 Outline Introduction Status of the Selection Boards Optical Transmitters Plans Requests

3 L0 Calorimeter Trigger Local Maximum Validation Detect a local high E T cluster in ECAL or HCAL 2x2 cells From 8x8 cm 2 (Inner ECAL) to 52x52 cm 2 (Outer HCAL) ECAL: 5952 cells  5952 possible clusters Validation by PS/SPD (same geometry) to get electron and photon candidates Combination to get π 0 candidates. HCAL : 1484 cells  1484 possible clusters Add the ECAL E T in front if available

4 The Selection Crate Data 40 MHz 28 electron clusters 28 photon clusters 2x28 neutral pion clusters (local, global) 80 hadron clusters 16 SPD hits partial sums Data output to the Highest transverse energy clusters for each cluster type (5 highest) Total transverse hadron energy (global trigger variable) Total SPD hit multiplicity (global trigger variable) Data output to the L1 The entire set of the processed clusters

5 Selection Board (Select 1 st and 2 nd highest) 10-ch 8-ch 10-ch 12 channel optical transducer Deserialization Demu 2:1 Synchronization Processing Unit 1200pins Processing Unit 1200pins Deserialization Demu 2:1 Synchronization Deserialization Demu 2:1 Synchronization TTCrq Glue Card CCPC Fast Control ECS 1-ch Tx Bus adapter: PCI to JTAG and I 2 C Ghosts removal to select the 2nd highest

6 Selection Board (Select 1 st highest) 10-ch 8-ch 10-ch 12 channel optical transducer Deserialization Demu 2:1 Synchronization Processing Unit Processing Unit TTCrq Glue Card Glue Card CCPC Fast Control ECS 1-ch Tx L1 buffer To the L0DU Highest and transverse energy sum L1 Deserialization Demu 2:1 Synchronization Deserialization Demu 2:1 Synchronization 28 clusters of 32 bits to L1 in case of L0 accept L0

7 Selection Board Test Setup Pattern GeneratorSelection Board Prototype Optical Fiber Links Single Channel Optical Transmitter

8 BER measurements Fiber Optical 1.6 Gb/s Transmitter boards  80 meters  DG2040 Tektronix 40MHz Receiver boards SDA 5000 Lecroy BERT Xilinx FPGA VME Control Crystal Oscillator 80MHz clock generator Pattern Generator Reference Pattern BERn(bits) tt · min · h · h Time of Measurements When no error are detected C.L. 90%

9 Eye Diagram Technique Oscilloscopio Lecroy SDA5000 Jitter sul clock

10 Selection Board Input Stage INPUTINPUT Input stage: 1/3 of the final 9U board at the actual component density.

11 Pattern Generator (BERT) Single Channel Optical Tx Prototypes Optical Transducer

12 Test of the ECS (slow control) Credit Card PC Glue Card Test using the Linux OS Genova test board

13 Optical Transmitters Mezzanine Boards Board TypeItemsSparesPlugged to 1-channel164PreShower&SPD 1-channel244Selection Board 5-channels184CROC 8-channels284Validation Card 12-channels264CROC Items: boards

14 Single Channel Optical Transmitter (top side) Laser Diode SMA Connector GOL Control Status LED 40 mm 40MHz Control 32 bits Connectors GOL VCSEL Power Voltage-Optical Transducer Vertical Cavity Surface Emitting Laser, made by ULM Photonics type ULM TN-USMB0P. High speed up to 5 Gbps. SMA fibre connector. Operate on multimode fibre at wavelength of 850nm Gigabit Optical Link, chip made by the CERN microelectronic group. It has been designed to be less sensitive to radiation effects

15 Single Transmitter (bottom side) Dip switch to set the GOL I 2 C address SAMTEC High Speed Connectors 0.635mm Hi-Speed Header QTS and QSS series

16 Multichannel Optical Transmitter Top side Clock distributor I2C addresses Bottom side 250 pin/connector Optical Transducer HFBR772BH 116 GOL

17 Transmitter Test Board TTCrq Filtered Clock QPLL External Clock 12 channels test platform 1 Channel test platform Pattern Generator Single Channel Tx MHz

18 Mechanical Specification Single channel optical link

19 Mechanical Specification Multiple channels optical link

20 Plans December 2004: Test of the Optical Transmitters and test of the final prototype of the Selection Board May-June 2005: Purchasing of the fundamental electronics components (GOLs, Laser Diodes, etc) and of the optical fibers and of the optical patch panel December 2005: Building of the optical transmitters and the selection board

21 Electronics Components ComponentVendorItems GOLCERN800 1ch Laser DiodeULM Photonics/CERN60 12 ch Opt. Transd. TxItaly30 12 ch Opt. Transd. RxItaly40 TTCrqCERN12 Credit Card PCCERN12 Glue CardCERN12

requests for fundings Trasferte interne10.0 KEuro Trasferte estero70.0 KEuro Consumo e metabolismo( ) KEuro Inventariabile5.0 KEuro Costruzione apparati300. KEuro

23 The Selection Board Input Interface Processing Unit Output Interface Slow ControlFast Control