1 1 rapid recent developments in phase i l1calo weakly 25 jul 2011 norman gee

11

Rapid recent developmentsin Phase I

L1Calo Weakly25 Jul 2011

Norman Gee

25-Jul-2011 N Gee - L1Calo Weekly - Upgrade 22

Background

• Phase-I Task Force set up to recommend contents of Phase-I upgrade

• By July had met 5 times since Dec 2010

• Before last week, draft text from TDAQ – mainly level-1, concentrating on latency and known planned changes in L1Calo, L1Muon and CTP

• Some emphasis low threshold leptons

– Including nMCM, CMX, L1Topo

• Suddenly, meetings 8,12,14,19 July + “pre-meetings”

• Detailed draft from LAr on 19 Jul at 10:30 for 13:00 pre-meeting!!

– Baseline plan is fully replaced TBB. New TBB gives existing Analogue + 4 digitised depth samples; AND could provide lateral granularity

– Tile would change only in 2021

– 4 x 4 area to be instrumented in both calorimeters for tests


Background

• Coincided with Stockholm follow-up meeting (organised by DF+CB, with SH, ML, SS invited but travelling, NK, NG)

• Discussion on L1Calo response… agreed to prepare diagrams & list functions (NG) + thoughts on no of connections (ML)– Several ad-hoc, undemocratic discussions in a frenetic week at CERN,

diagrams become obsolete before drawing was complete, etc

• Meeting organised to discuss evolution in Simulation results post-Stockholm between Alan (using L1Calo granularity) and Denis Damazio & Steve Sekula (using L2 environment)– Conclusion: significant risk that ATLAS may be limited in trig capability,

joint R&D on new TBB L1Calo should continue• This went into Ph-I TF draft recommendations, was reported to USC, seems

to have been accepted (full report being assembled this week)

• Need to do work on architecture. Current diagrams follow:


Possible Phase I Level-1 Trigger Schemeshown to Ph-1 TF on 9 June

CMX

Muon TriggerBarrel Sector Logic

Endcap Sector Logic

Central Trigger

L1Topo CTP

CORE

CMX

Calorimeter Trigger

Preprocessor

Electron/Tau

Jet/Energy

nMCM

MuCTPi

ProposedNew Electronics

New SW

AnalogueSignals

Interconnections - one of several possible schemes

PhaseITrig27May 11


20 July

Central Trigger

L1Topo CTP

CORE

CMXnMCM

CMX

Calorimeter Trigger

Preprocessor

Electron/Tau

Jet/Energy

AnalogueSignals


Endcap Sector Logic

MuCTPi


New SW

PhaseI LarDepth20Jul11

NewDigitalTBB

DIgitalPreprocessor

LAr DepthProcessor

DAQ DAQ


Comments

• Approximate size of system – from ML count of links in a depth-only system – roughly 8 digital Preprocessor modules + 1-2 “Depth Processors”

– Could all fit in 1-2 crates, not a large/expensive/complex system

• Thinking:

– Need to preserve all outputs provided by present L1Calo

– We can’t delay L1Calo signals (needed by L1Topo for muon isolation)

– New TBB signals are probably much later than PPR outputs (? 10 ticks)

– Can’t get new TBB e.m. signals into existing system

– Very hard to get old Tile etc had signals into new system • would have to immediately expand to several crates – 3600 signals on

grey cables: needs duplicate signals or entirely replace L1Calo

– New parallel system is an incremental upgrade, not a replacement

– Could be a prototype for Ph-II, Level-0


More 20 July

Central Trigger

L1Topo CTP

CORE

CMX

nMCM

CMX

Calorimeter Trigger

Preprocessor

Electron/Tau

Jet/Energy

AnalogueSignals


Endcap Sector Logic

MuCTPi


New SW

PhaseI LarFex25Jul11

NewDigitalTBB

DIgitalPreprocessor

FeatureExtractor

DAQ DAQ


Functions of boxes on diagram

• Name change – Depth Processor becomes Feature Extractor• Digital Preprocessor (individual channel-based)

– Receive signals optically from from digital TBB, convert to 40 MHz, handle data reception errors;

– Adjust timing to common phase and common clock;– BCID filtering, energy calibration, + other functions, e.g. rate metering;– Read out to DAQ (Slink or...)– Remap signals and transmit on fibres, providing duplicates as needed

• Depth processor (sliding window based)– Receive signals from digital preprocessor– Perform magic depth/granular algorithms– Either (a) send results to L1Topo, or– (b) send results to CMX, or– (c) get RoIs from CMX, match to depth data, send results to CTP

and/or L1Topo.• Both to provide DAQ/RoI readout as needed


Next Steps

• Algorithms, connectivity, partitioning, modularity, latency, simulation, infrastructure, readout, rack space, fibre routing, …

1 1 rapid recent developments in phase i l1calo weakly 25 jul 2011 norman gee

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