WBS 3.1.1 Muon Trigger Overviewhep.wisc.edu/wsmith/cms/Lehman99_hauser.pdf · 1999. 3. 1. · US...

US CMS DOE/NSF Review: February 17-19, 1999 1

WBS 3.1.1 Muon TriggerOverview

WBS 3.1.1 WBS 3.1.1 MuonMuon Trigger TriggerOverviewOverview

Jay Hauser, UCLA

DOE/NSF ReviewFebruary 18, 1999


Outline (20’)Outline (20’)Outline (20’)

Overview of Muon Trigger Design• Relation between CSCs and trigger electronics• Front-end electronics (Endcap Muon)• Data collection and Track Finder (TRIDAS)

Overview of Technical Progress since 5/98• Test beam ‘98 results• Design and documentation

Changes Since Last ReviewResponses to 5/98 Committee ConcernsConclusions


Muon Detectors, Trigger LogicMuon Muon Detectors, Trigger LogicDetectors, Trigger Logic

Muon Detectors

Trigger Logic


Trigger Regions in ηTrigger Regions in Trigger Regions in ηη

5.68

m

6.66

m

7.24

m

8.49

5 m

9.75

m

10.6

3 m

10.8

3 m

6.45

m

10.8

6 m

10.9

1 m

14.5

3 m

14.5

6 m

14.9

6 m

4.905 m

1.811 m

HF/1

ME

/1/3

YE/1

ME

/3/2

ME

/4/2

ME

/2/2

ME

/2/1

ME

/3/1

ME

/4/1

ME

/1/1 HE/1

EB/1M

E/1

/2

HB/1

YE

/3

YE

/2

EE

/1

CB/0

SE/1

SB/1

CMS - PARA- 003 - 14/10/97 PP

η = 5.31

4.33

2 m

3.90

m

1.711 m1.9415 mη = 3.0

η = 2.4

η = 1.479

η = 1 η = 0.5η = 1.1

0.440 m

2.864 m2.700 m

3.800 m

7.380 m7.000 m

5.975 m

4.020 m

0.00 m

1.185 m1.290 m

0.00

0 m

2.93

5 m

2.950 m

MB/2/1

MB/2/2

MB/2/3

MB/2/4

YB/2/1

YB/2/2

YB/2/3

MB/1/1

MB/1/2

MB/1/3

MB/1/4

YB/1/1

YB/1/2

YB/1/3

MB/0/1

MB/0/2

MB/0/3

MB/0/4

YB/0/1

YB/0/2

YB/0/3

/pg/hr

CSC

DTOverlap

1.2 > η > 0.9

ME3 ME2 ME1

MB1

MB2

MB3

MB4

Separatetriggerregions


CSC Trigger PrimitivesCSC Trigger PrimitivesCSC Trigger Primitives

• Single BXtiming fromanode wires

P2 (large) chamber

Strips

Wires

Anode Wire Preamps, CF Discriminators

Cathode Preamps/ Precision DAQ

1

Strips

Layer

23456

Anode LCT cards

Hits

LCT (>=4)

Time (Xings)

123456

Early n/γhit

Xing (>=2)

Goal: 92% Bunch ID

efficiency

Cathode LCT cards Goal: ±0.1 strip

resolution

Trigger Comparator Networks

THRESH

L

R

Qn

Goal: 92% half-strip ID

efficiency

Trigger Motherboard

Goal: 99% efficiency for +-1 BX correlation

TRIG

LCT cards and Trigger Motherboard are in counting house (CAMAC)

• Phi (bend)position to1mm fromcathode strips

Focus of ‘98 prototypes:


Muon Track-FindingMuon Track-FindingMuon Track-FindingLink trigger primitives into tracksAssign P T, ϕ, and ηSend highest P T candidates to Global L1 trigger

θ

ϕ


CSC Track-FinderRequirements

CSC Track-FinderCSC Track-FinderRequirementsRequirements

High efficiencyTrigger Rate:

• Single muon rate < few kHz at L = 1034cm-2 s-1

Resolution:

• σPt / Pt ≤ 30% (Requires η information )

Selection:• ≤ 3 muons per 60° sector

Redundancy• Require only 2 stations out of 3 (or 4)

Minimal latency, pipelined, programmable


Trigger Regions in ϕTrigger Regions in Trigger Regions in ϕϕ

ME1/3

MB2/2

MB2/1Illustration ofoverlap region


60o Sector Block Diagram6060oo Sector Block Diagram Sector Block Diagram

Endcap Muon

TRIDAS

Individual CSCChambers

12 Sectors( 2 Endcaps)


CSC Muon Trigger SchemeCSC Muon Trigger SchemeCSC Muon Trigger SchemeStrip FE cards

Wire FE cards

Motherboard

TMB

Port Card

PC

Sector Receiver Sector Processor

OPTICAL

SR SP

CSC Track-Finder

CSC Muon Sorter

Global µ Trigger

DTRPC

FE

FE

Global L1

2µ / chamber 3µ / port card 3µ / sector

4µ

4µ

4µ 4µ

LCT

LCT

Strip LCT card

Wire LCT card

On chamber In chamber crate

In counting house


Physical Layout of CSCTrigger Electronics

Physical Layout of CSCPhysical Layout of CSCTrigger ElectronicsTrigger Electronics

Front-end A/D for Trigger:• Cathode cards have comparator ASICs• Anode cards have discriminators and BX

latch

Muon Stubs:• Raw bits go to 9U crates on iron disk

periphery• 6-layer muon stubs measured by LCT

cards• Anode/cathode matching, RPC

coincidence at Trigger Motherboards• Collection of data & optical links from

Port Cards

Muon Track Measurement:• Stubs go to 9U crates in counting house• Stubs received, formatted, aligned in

Sector Receivers• Tracks found in Sector Processors• Tracks selected by CSC Muon Sorter

End

cap

Muo

n S

yste

mT

riDA

ST

riDA

S S

yste

m S

yste

m

SRCSC

ME 1

SRCSC

ME2,3

DTIM

SPCSC

SPOVL

208

208

204

SRCSC

ME 1

SRCSC

ME2,3

DTIM

SPCSC

SPOVL

208

208

204

CCC

CPU


CSC Trigger PrimitivesCSC Trigger PrimitivesCSC Trigger Primitives

• Single BXtiming fromanode wires

P2 (large) chamber

Strips

Wires

Anode Wire Preamps, CF Discriminators

Cathode Preamps/ Precision DAQ

1

Strips

Layer

23456

Anode LCT cards

Hits

LCT (>=4)

Time (Xings)

123456

Early n/γhit

Xing (>=2)

Goal: 92% Bunch ID

efficiency

Cathode LCT cards Goal: ±0.1 strip

resolution

Trigger Comparator Networks

THRESH

L

R

Qn

Goal: 92% half-strip ID

efficiency

Trigger Motherboard

Goal: 99% efficiency for +-1 BX correlation

TRIG

LCT cards and Trigger Motherboard are in counting house (CAMAC)

• Phi (bend)position to1mm fromcathode strips

Focus of ‘98 prototypes:


98 Prototype Beam Test98 Prototype Beam Test98 Prototype Beam Test

Comparators

Anode/Cathode LCT

CSC Chamber

TriggerMotherboard


CSC Trigger Results fromCERN ‘98 Test Beam

CSC Trigger Results fromCSC Trigger Results fromCERN ‘98 Test BeamCERN ‘98 Test Beam

Cathodes for position:half-strip eff. 90% per layer0.1 strip/chamber position

resolution

Anodes for timing:bunch crossing efficiency 99%works at 7x max LHC rate

Cathode-anode timing:+-1 bunch xing 98% efficient

Prototypes meet the CMS design criteria in all aspects

Prototype electronics worked well(reliable, no pickup noise, etc.)


Endcap Muon SubsystemTrigger Component CountEndcap MuonEndcap Muon Subsystem SubsystemTrigger Component CountTrigger Component Count

Object No. DescriptionAnode Front-End 1476 Custom ASICs, custom size cardsCathode Front-End

1728 Custom ASICs, custom size cards

Anode LCT 360 9U cards: gate arraysCathode LCT 360 9U cards: gate arraysTriggerMotherboards

192 9U cards: gate arrays

SCSI cables to FE 3204 Indiv. Shielded twisted-pairFlat cables to FE 1476 34-conductorCrates 96 9U VIPA standardPower Supplies 96 High-power 5v and 3.3vFlat cablesbetween 9Umodules

34-conductor


TriDAS Component CountTriDASTriDAS Component Count Component Count

Object No. DescriptionMuon Port Card 60 9U cards: clock rcvr., clock

distribution, gate arrays, opticalxmitters

Optical fibers 360 E.g. Glink typeSector Receivers 24 9U cards: optical rcvrs., gate arraysSector Processors 24 9U card: gate arrays, memoriesClock&ControlCards

6 9U card: clock distribution, DAQinterface

Muon Sorter Card 1 9U card: gate arraysCrates 6 9U VIPA standardPower Supplies 6 High-power switchersCopper cables Twisted-flat


New Layout for CSCTrack-Finder Crate

New Layout for CSCNew Layout for CSCTrack-Finder CrateTrack-Finder Crate

SRCSC

ME 1

SRCSC

ME2,3

DTIM

SPCSC

SPOVL

208

208

204

SRCSC

ME 1

SRCSC

ME2,3

DTIM

SPCSC

SPOVL

208

208

204

CCC

CPU

• Two 60° sectors housed in one 9U VME crate withcustom backplane

• Each SR-CSC sends 6 CSC muon stubs × 34 bitsand 4 bits BXN = 208 bits

• Each DT-IM sends 8 DT muon stubs × 25 bitsand 4 bits BXN = 204 bits


Sector Receiver FunctionalitySector Receiver FunctionalitySector Receiver Functionality

• Receives 6 stubs via 12 optical links from 2 Port Cards (3 in ME1)

• Synchronizes the data

• Reformats the data

• LCT bit pattern → η, ϕ, Ψ• Communicates to Sector Processor via custom point-to-point

backplane

• Fans out signals to CSC overlap processors and sends ME1/3signals to DT Sector Processor


Sector Processor FunctionalitySector Processor FunctionalitySector Processor Functionality

Identify and measure muons from ~600 bits every 25ns (3 GB/s)

1. Perform all possible station-to-station extrapolations in parallel

Simultaneously search for roads in ϕϕ and ηη

2. Assemble 2-, 3-, 4-station tracks from 2-station extrapolations

3. Cancel redundant short tracks if track is 3 or 4 stations in length

4. Select the three best candidates

5. Calculate P T, ϕ, η and send to CSC muon sorter


Muon Sorter FunctionalityMuon Sorter FunctionalityMuon Sorter Functionality

• New processor added since lastreview

• The 3 highest rank muons from eachSector Processor are sent to the CSCmuon sorter , which selects the 4highest rank

• Total muon count:• 3 muons × 6 sectors × 2 endcaps × 2

regions = 72 muons for CSC and OVLregions

• Sent to Global L1 Muon Trigger forassociation with RPC and DT triggers


Muon Trigger ChangesSince 5/98

Muon Muon Trigger ChangesTrigger ChangesSince 5/98Since 5/98

• Cathode front-end• 4:1 data compression in cathode comparator

ASIC (submitted to foundry)• Comparator ASICs integrated with cathode

front-end board (board layout)

• Anode front-end• BX latching integrated with anode front-end

board (board layout)

• New CSC/RPC coincidence option• Trigger logic moved off of

chambers• VME 9U crates on iron disk periphery• Advantages: power, cooling, DAQ readout,

access, seamless trigger

• Track Finder refinements• Fully documented design, including

Endcap/Barrel interface


Highlight TRIDAS Changes:Highlight TRIDAS Changes:Highlight TRIDAS Changes:• Agreement on Barrel/Endcap boundary

• Barrel and Endcap Track Finders are fundamentallydifferent (2D versus 3D)

• Information will be sent both ways• The actual boundary (0.9-1.2) will be “hard” but

programmable

• Data distribution in Track Finder crates• CSC and Overlap processors in same crate• Saves 2 crates, 24 Sector Receivers, many cables, etc.

• Addition of ME1/1 split strips• Costs 12 additional Port Cards, more optical links

• Addition of CSC muon sorter• One additional card

• Addition of VME test stands - contingency used


Available ResourcesAvailable ResourcesAvailable Resources

Muon Port Card and Sorter Card (Rice):

• P. Padley – physicists

• M. Matveev, N. Adams – engineers / technicians

Sector Processor (Florida and PNPI):

• D. Acosta, S.M. Wang – physicists

• Florida electronics shop – engineers / technicians

• A.Atamanchuk, V.Golovtsov, B.Razmyslovich – PNPIengineers

• B.Scurlock, M.Watkins – students

Sector Receiver (UCLA)

• J.Hauser, C. Shankar – physicists

• J.K., Y. Shi – engineers


DocumentationDocumentationDocumentation

USCMS TriDAS project management• http://hep.physics.wisc.edu/wsmith/cms/trig_pm.html

Technical info• CMS muon trigger home page

• http://cmsdoc.cern.ch/ftp/afscms/TRIDAS/mutrig/html/• USCMS Endcap muon home page

• http://uscms.fnal.gov/uscms/subsystems/muon/muon.html• CSC muon trigger home page

• http://www-collider.physics.ucla.edu/cms/trigger/• CSC trigger complete bit list

• ftp://hepsun0.physics.ucla.edu/pub/cms/trigger/triggerbits.ps• Motherboard/Port Card home page

• http://bonner-ntserver.rice.edu/motherboard/• Sector Processor home page

• http://www.phys.ufl.edu/~acosta/cms/trigger.html

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WBS 3.1.1 Muon Trigger Overviewhep.wisc.edu/wsmith/cms/Lehman99_hauser.pdf · 1999. 3. 1. · US...

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