Cluster Finder Report
Laura Sartori (INFN Pisa)
For the L2Cal TeamChicago, Fermilab, Madrid, Padova, Penn, Pisa,
Purdue
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MotivationCrossSection Level 2 Jet (Et>40 GeV)
1. At high lumi, large Increase of the jet/Met based trigger cross sections. Heavily prescaled search
triggers.2. Decrease of the multi-jets
trigger efficiency.
Reconstructed Jets @Level 3
Merging of the jets @ L2
Cause: L2 cluster algo (Pacman)
merges True/fake jets together:• Low Et jets high Et jets.• Multi-jet event single jet
event.
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L2Cal upgrade1. L1 calorimeter trigger tower infos
are available to the L2 decision CPU with 10-bit resolution.
2. New algorithm in L2 CPU:• Jet clustering (cone-based).• Met calculation using the trigger
tower energy info at the maximum resolution.
3. Possibility to implement different algo in the CPU (angular cuts, SVT matching..).
Install parallel L2CAL hardware path tobe tested in fully parasitic mode.
L2Cal
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New system overview
L1CAL Dirac Board
Calorimeter
L2 Decision Crate
10-bits
8-bits
L2CAL Cluster Finder Dcas
Global L2 Decision
New Hardware path
• Duplicate L1 Trigger Towers Energy Infos to run in parasitic .
• Collect, merge and send Trigger Towers to Global L2 Decision.
• New cluster finder Algo and Met.
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Duplicate the information
DIRAC
DCAS
New PulsarBoards
Goal: running in parasitic mode(current and new systemtogether).
How: A set of new 288 LVDS
cables(L-shape) connect DIRACwith DCAS boards (like in
thecurrent system) and DIRACwith the new Pulsars
Boards.
We are running smoothly from April.
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New Hardware Path
Pulsar Crate
(6)
6 slink outputs
6 slink outputs
Slink mergerPulsar (4)
PCPulsar Crate
(6)
Pulsar Crate
(6)
6 slink outputs
Use PULSARS as receivers for LVDS data from Dirac• Build a new Mezzanine Card to interface the 40
bit cables with PULSAR.
Serialize the data in Slink format• Receive on PC through
Slink-PCI boards
Pulsars receivers with 4 Mezzanine.
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Test the system• Monitoring:
– Full path up to CPU is monitored
• Timing studies for hardware and software path.
• New L2CAL bank (TUPD) in same format as old DCAS bank (TC2D). Comparison between the two banks.
• Compare decision bits between the main and upgrade PC.
Crate0
Crate1
Crate2
Merger
Merger
Merger
Merger
Merger
Global L2
Decision
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TESTSTAND ROOM…et la vie est plus facile!!!Doesn’t matter when, doesn’t matter what…in teststand you’ll find it!!
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Status of the hardware and software: the pieces.
• Hardware:– All in place and tested (Pulsars receivers,
cables, Pulsars mergers).– Included by-default in beam and
monitored since April without any outstanding problems.
• Monitoring:– Online monitoring available (to check
both data and timing).• Interface Software:
– Code for decision interface, finalized; • ready to build trigger tables for
L2Cal.• Clustering Software:
– Finalized.• New L2Cal bank
– Finalized. Included by-default in beam.
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Decision Comparison:– All decision bits (between main and upgrade PC) match in
every events stream D (10k events)
The system worked smoothly!!
Commissioning started: we run in parasitic mode for 2 stores in the last week:
Timing– Faster than main system by
1.5 usDead Time about 4.7%
Commissioning
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ToDo List
Still work left to do before readiness review (middle june)
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Any Questions?? In the L2Cal web page you can found all the answers (tests results, status of
the commissioning, hardware and software details, link, talks, howto, instructions, our pictures..).
http://www-cdfonline.fnal.gov/upgrades/daq_trig/l2cal/l2cal_home.htm
Progress, questions, comments, problems, doubts, documented in L2Upgrade e-loghttp://www-cdfonline.fnal.gov/cgi/elog/det-system-elog.pl?nb=l2upgrade
Day by day the monitoring give feedback about the hardware status:http://www.pd.infn.it/~cortiana/TrigMonOut/TrigMonOut.html
L2Cal Firmware http://www.pi.infn.it/~piendi/L2cal_upgrade