Muon Track-Finder Trigger
Darin Acosta
University of Florida
May, 2003
US CMS DOE/NSF Review, 19-21 May 2003
1
CSC Muon Trigger Scheme
EMU
Trigger
On-Chamber
Trigger Primitives
Trigger
Motherboard
(UCLA)
Strip FE cards
Muon
Port
Card
(Rice)
LCT
3-D Track-Finding
and Measurement
Sector Receiver/ Processor
(U. Florida)
OPTICAL
FE
SR/SP
MPC
SP
LCT
3 / port card
TMB
FE
2 / chamber
Wire LCT card
Wire FE cards
RIM
RPC Interface
Module
Combination of all
3 Muon Systems
US CMS DOE/NSF Review, 19-21 May 2003
3 / sector
In
counting
house
RPC
4
CSC Muon Sorter
(Rice)
DT
4
4
Global  Trigger
Global L1
4
2
Muon Track-Finding
• Link trigger primitives into 3D tracks
• Measure pT, , and  in non-uniform fringe field
• Send highest quality candidates to Global Trigger
• Partitioned into 60° sectors
that align with DT chambers


US CMS DOE/NSF Review, 19-21 May 2003
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Basis of Track-Finding Logic
D
 Road Finder:
•Check if track segment is in allowed trigger
region in .
•Check if D and  bend angle are consistent
with a track originating at the collision vertex.
1
2
IP
Df
2
f Road Finder:
1
•Check if Df is consistent with f bend angle fB
measured at each station.
•Check if Df in allowed range for each 
window.
IP
Quality Assignment Unit:
•Assigns final quality of extrapolation by
looking at output from  and f road
finders and the track segment quality.
US CMS DOE/NSF Review, 19-21 May 2003
Extrapolation Units utilize
3-D information for trackfinding.
4
PT Measurement
Df
Pt LUT
2
PT
4 MB
Can use information
from up to 3 chambers
1
Pt = f(Df12, Df23 ,  )
IP
Residual Plot
Constant Pt Contours for:
3, 5 ,and 10 GeV s.
Res=22%
US CMS DOE/NSF Review, 19-21 May 2003
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L1 Trigger Table (L=2×1033)
Only (endcap) muon triggers have low enough thresholds to allow
a B-physics program at CMS in addition to the high PT physics
US CMS DOE/NSF Review, 19-21 May 2003
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Trigger is Extensible
ME1
Single TeV  Events with
neutron background

Without ME4/1: e = 72%
With AU Corrections: e = 86.3%
De/e = 20%
US CMS DOE/NSF Review, 19-21 May 2003
X
ME2 ME3 ME4
X
X
X
• With re-scope of
ME4/1, trigger logic
can be modified to take
advantage of
redundancy and
remove bad hits
(hardware I/O can
always accept ME4)
• Improvement in
acceptance and PT
assignment yields 20%
increase in efficiency
in forward region
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1st Prototype Track-Finder Tests
Sector Processor
(Florida)
Sector Receiver Clock Control
(UCLA)
Board (Rice)
SBS
VME
Interface
Custom
ChannelLink
Backplane
(Florida)
Results
included in
Trigger TDR
(2000)
US CMS DOE/NSF Review, 19-21 May 2003
Muon Port Card
(Rice)
Very
successful,
but overall
CSC latency
was too high
New 2002
design
improves
latency
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CSC Track-Finder Crate
Muon Sorter
SR SR SR SR SR SR
/ / / / / /
SP SP SP SP SP SP
MS
CCB
Clock and Control
Board
SBS 620 Controller
Second generation prototypes
SR SR SR SR SR SR
/ / / / / /
SP SP SP SP SP SP
Sector Processor
From MPC
(chamber 4)
From MPC
(chamber 3)
From MPC
(chamber 2)
From MPC
(chamber 1B)
From MPC
(chamber 1A)
To DAQ
Single Track-Finder Crate Design with 1.6 Gbit/s optical links
Custom 6U GTLP backplane for interconnections
US CMS DOE/NSF Review, 19-21 May 2003
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Combined SR/SP 2002
• Delays with complex
layout using
in-house tools
• Sent to industry for
completion of layout
using Cadence
Allegro
• Final board takes 16
layers
• 3 boards
manufactured and
stuffed
US CMS DOE/NSF Review, 19-21 May 2003
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SP2002 Main Board (SR Logic)
DC-DC Converter
EEPROM
Phi Global
LUT
VME/
CCB
FPGA
Eta Global
LUT
Phi Local
LUT
TLK2501
Transceiver
To/from
custom
GTLP
backplane
Front
FPGA
Optical
Transceivers
•15 x 1.6
Gbit/s Links
3 SRs
US CMS DOE/NSF Review, 19-21 May 2003
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SP Trigger Logic
From SP2000
to
SP2002 mezzanine card
(5 manufactured)
Xilinx Virtex-2 XC2V4000
~800 user I/O
(Mezzanine card is also used for CSC sorter)
US CMS DOE/NSF Review, 19-21 May 2003
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Tests underway…
US CMS DOE/NSF Review, 19-21 May 2003
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Optical Link Tests
Currently we are testing 3 optical links in a
MPC to SP chain test
• One test uses the pseudo-random number test
built into the TLK2501 chipset
• Another uses software that downloads data into
the MPC buffers and explicitly reads out and
compares the data received by the SP
• The CCB is used for control and clock signals
Software, firmware, and tests are still
ongoing
US CMS DOE/NSF Review, 19-21 May 2003
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Remaining Crate Tests Foreseen
•
•
•
•
•
•
•
SP  SP optical link (all 15) tests
SR LUT memory tests
SP track-finding logic tests (mezzanine card)
Multi-MPC to SP crate tests
SP  Muon Sorter crate tests
SP  EMU DAQ board (DDU) tests
SP  DT Track-Finder interface tests
These tests are expected to take place
during this summer and Fall
US CMS DOE/NSF Review, 19-21 May 2003
15
Beam Test Plans
Plan to test CSC Trigger all the way to
the Track-Finder in beam tests at CERN
during May/June
• Complete chain test from 2 detectors to
peripheral crate electronics to Track-Finder
crate electronics!
Our goal is to validate that trigger
primitives are found efficiently on
correct BX and successfully received
over optical links
• Record as much data as possible under various
detector configurations for future track
identification studies
US CMS DOE/NSF Review, 19-21 May 2003
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Personnel
Professors
• Darin Acosta (Florida), Robert Cousins (UCLA), Jay
Hauser (UCLA), Paul Padley (Rice)
Postdocs
• Sang-Joon Lee (Rice), Holger Stoeck (Florida),
Slava Valouev (UCLA), Martin Von der Mey (UCLA), Song
Ming Wang (Florida)
Students
• Brian Mohr (UCLA), Jason Mumford (UCLA),
Greg Pawloski (Rice), Bobby Scurlock (Florida),
Engineers
• Alex Madorsky (Florida), Mike Matveev (Rice),
Ted Nussbaum (Rice), Alex Tumanov (Rice - Software)
Collaborating engineers (PNPI)
• Victor Golovtsov, Lev Uvarov
US CMS DOE/NSF Review, 19-21 May 2003
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