L2 CAL Status Vadim Rusu For the magnificent L2CAL team

L2 CAL status 2 The goal Improve the L2 MET resolution so that we can run at lower MET at L2  L1 only uses 8/10 bits  No L2 calculation in the current system Change the jet clustering so that we can control the rates at high luminosity  Current L2 clustering – pacman style MET+2 JETS JET40

L2 CAL status 3 The design L1CAL Dirac Board Calorimeter L2 CPU L2 Decision Crate 10-bits Energy/Tower 8-bits Global L2 Decision L2CAL Cluster Finder Dcas New Hardware Path L2 CPU Muon/XTRP/L1/SVT/XCES  Add new hardware to send the towers straight to the L2 PC  Get new PC for better performance (about time anyway)  Everything to be commissioned parasitically

L2 CAL status 4 The project An international mini-collaboration  Fermilab  Chicago  Madrid  Padova  Penn  Pisa  Purdue  Started – Oct 2006  Completed - ASAP

L2 CAL status 5 The know-how Use PULSARs as receivers for the LVDS data from DIRAC  Need to interface the 40 bit cables with the PULSAR  Build Mezzanine card Serialize the data in Slink format  Receive on PC through Slink-PCI boards TIMING GOAL ~ 20 us Pulsar Crate (6) 40-bit CDF_clk (132 ns) 6 slink outputs 6 slink outputs Slink merger Pulsars (8) PC Data transfer latency on average within ~10 us 40 Mhz Pulsar Crate (6) 80 MhZ 40 MhZ Clustering timing ~ 10 us Pulsar Crate (6) 6 slink outputs 80 MhZ 96 LVDS cables

L2 CAL status 6 The tool FPGA Altera LVDS Connector Pulsar side 40 EM HAD 10bits x4 = cdfclk (132ns) input data per cable JTAG Pulsar front panel 160 CMC Connectors to the pulsar  L2 CAL mezzanine card

L2 CAL status 7 The tool Built at UC in record time  Thanks Henry and e-shop Tested and commissioned revision 1.0 over the holidays  Worked out of the box Ted makes good for the bet he lost.

L2 CAL status 8 The pieces Mezzanine design  Laura Testing/Checkout  Lucas, Miguel Firmware  Marco, Laura FER code  Massimo, Laura Simulation package  Simone D., Gene F. Monitoring  Giorgio + Simone P., Michael – Wojtek/Carla – consulting PC infrastructure and algo  Gene + Kristian Hahn – consultant PC interface  Anadi Preparing the celebrations (parties, happy hours, etc…)  myself

L2 CAL status 9 The status Boards – arrive over the month of February  Mezzanine, Slink, AUX (Henry – UC) Front panels and strain relief (Richard – UC)  Pulsars (Paola – Pisa) Cables – 80% in hand  Cable map (thanks JDL) Software – final testings Firmware – stage 1 ready to go

L2 CAL status 10 The plan Start splitting the cables one DCAS crate at a time starting next week Have half the DCAS system split and parasitically running by the end of February March have all system running parasitically April – new trigger tables May – Project completed  10 bit MET resolution  New Jet algorithm (cone based)

L2 CAL status 11 The future The L2 CAL trigger will be a very versatile system What the new L2CAL will provide:  10 bit MET at L2  Better L2 jet position  L2 jet closer to offline jets What else?  Angular correlations (jets, MET)  Track jet matching  Dijet mass New paradigm: Your offline analysis code can be implemented in the trigger  Use the L2 CAL simulation to do studies that will improve the trigger selection  Already starting on this in the context of HTTF

L2 CAL status 12 THE END