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