CSC Muon Trigger Overview by mudoc123

VIEWS: 8 PAGES: 19

									                                        CSC Muon Trigger
                                     On Detector Components

                                      B. Paul Padley
                                      Rice University
                                        June, 2002


US CMS DOE/NSF Review: June 2002, B.Paul Padley, Rice University   1
                          CMS Endcap Muon System

• 3 or 4 stations
• Each CSC chamber has
  six planes:
    1. Radial cathode strips for
       precision muon position
       and bend direction
       measurement
    2. Anode wires for timing
       (bunch ID) and non-bend
       position measurement
• There is also a RPC
  system overlapping the
  CSC‟s to provide a
  redundant trigger

  US CMS DOE/NSF Review: June 2002, B.Paul Padley, Rice University   2
                           CSC Muon Triggering
      • Trigger primitives are wire and strip segments
          • Wires give 25ns bunch crossing
          • Strips give precision  information
      • Link trigger primitives into tracks
      • Assign pT , , and 
      • Send highest quality tracks to Global L1




                                                                   
                                           
US CMS DOE/NSF Review: June 2002, B.Paul Padley, Rice University       3
                                Trigger requirements
  Cathode LCT
         • Identify cathode track segment.
           Pt trigger based on angle of LCT
         • For Pt threshold of 20-40 GeV requires
           Dp/p < 30% (in order to limit single
           muon trigger rate in Level-1 to a few
           KHz)
         • Track hits must be located to within ½
           strip width in each chamber layer
  Anode LCT
         • Form anode track segment.
         • Tag bunch crossing of track segment
           with > 92 % efficiency per chamber



US CMS DOE/NSF Review: June 2002, B.Paul Padley, Rice University   4
                               EMU “Trigger” Cards
Anode LCT Card (ALCT)
       •   Sits on Chamber
       •   Receives Anode Front End Board discriminator signals
       •   Finds eta coordinate of two best track stubs and quality
       •   Sends to Trigger Motherboard
Trigger Motherboard (TMB)
       • Receives ALCT info
       • Receives Cathode Front End Board discriminator
         Signals
       • Finds location, bend angle and quality of two best
         cathode track stubs
       • Correlates Anode and Cathode LCT‟s
       • Sends to Port Card (MPC)


US CMS DOE/NSF Review: June 2002, B.Paul Padley, Rice University   5
                   EMU “Trigger” Cards Cont‟d
EMU Clock and Control Board (CCB)
       • Receives Clock and Control signals (such as
         L1accept, reset…) from Trigger Timing and
         Control system
       • Redistributes these signals on the custom
         backplane.
RPC Interface Module (RIM)
       • Transition module that receives RPC trigger
         information
       • Could be used in TMB to eliminate ghosts (if
         they are a problem).


US CMS DOE/NSF Review: June 2002, B.Paul Padley, Rice University   6
                          Endcap Muon Trigger Primitive
                                  Generation
                                         Clock Control Board                                Trig Motherboard
                                                                                                      DAQ Motherboard
                                                               D TD T D TD TDT CMTD T D TD TD
                                                               M M M MM M M M M M C P M MM M M MM M
                                                             CBB B BB BBB BB BCB BB BB BB B
                                                             O
                                                             N
                                                             T
                                                             R
                                                                                                        Trigger-Timing-Control
                                                             O
                                            Optical          L
                                                             L

                                            link             E
                                                             R


                                                                                                      Peripheral Crate
                                                                                                        on iron disk

Muon Sector Receiver
   Lev-1 Trigger                                                                                           Cathode Front-end Board
                                                                  CFEB CFEB CFEB CFEB CFEB




                                                                          LVDB    ALCT
                                                                                                          Anode LCT Board

                 In underground           On detector
                 counting room
                                                                                                          Anode Front-end Board
                                                                         CSC

     US CMS DOE/NSF Review: June 2002, B.Paul Padley, Rice University                                                     7
                                           Peripheral Crate
Board              # per        Responsibility
                   crate
VME Cont.             1         OSU
                                                                                                 There are
TMB/                  9         UCLA
                                                           DT D T D T D T D T CMT DT D T DT D    48
CLCT                                                       MM M MM M M M M M C P M MM M M MM M
                                                         C BB B BB BB B BB B CB BB B B BB B      peripheral
                                                         O
DMB                   9         OSU                      N                                       crates in the
Clock and             1         Rice
                                                         T
                                                         R                                       Endcap
Control                                                  O
                                                         L
                                                                                                 Muon
Board                                                    L                                       system
                                                         E
Muon                  1         Rice                     R

Port Card



                                      Only “on detector” “Trigger” board is the Muon
                                      Port Card (MPC)
                                      It accepts ALCT/CLCT pairs from each TMB
                                      Selects the best 3 and sends to counting room.
   US CMS DOE/NSF Review: June 2002, B.Paul Padley, Rice University                                  8
                          CSC Sectors Data Mapping




US CMS DOE/NSF Review: June 2002, B.Paul Padley, Rice University   9
                          CSC Muon Trigger Scheme
   On-Chamber                                                                        3-D Track-Finding
                                             Trigger              Muon               and Measurement
   Trigger Primitives                                              Port
                                           Motherboard                                    Sector
Strip FE cards                               (UCLA)                Card
                                                                                          Receiver/ Processor
                                                                  (Rice)
                                                                                          (U. Florida)
                                                   LCT                         OPTICAL

        FE
                                                                   MPC                         SR/SP            SP
                        LCT
                                                  TMB                           3 / port card
        FE
                                                            2 / chamber                          3 / sector
            Wire LCT card
Wire FE cards                                                             In
                                                                       counting
                                RIM                                     house             CSC Muon Sorter
                         RPC Interface                                  RPC     DT            (Rice)
                           Module                                         4         4      4

                                    Combination of all                   Global  Trigger              Global L1
                                    3 Muon Systems                                                4
    US CMS DOE/NSF Review: June 2002, B.Paul Padley, Rice University                                             10
                                             Responsibilities
     USCMS Endcap Muon                                                USCMS Trigger/DAQ 3.1.1
               OSU                Cathode LCT/
                                  Motherboard/        Port                   Sector Receiver          Sector Processor
Cathode Front-End                 RPC
                                                      Card
                                                                      OPTICAL

                                     LCT                                                      SR/SP
                                                                                                                      Florida
            CFE                                                                                                       3.1.1.17
                                                       MPC


       AFE
                                     TMB
Anode               Anode
                                                                                              CSC
Front-End            LCT                                                                                      Rice
                                     RPC                                                     Muon
                                                       Rice                                                3.1.1.15
                                     in.                                                     Sorter
     CMU                                             3.1.1.1
                                                                                  RPC DT
                                          Rice
                     UCLA               /UCLA

                                                                                     Global               Global L1
                                                                                     Trigger                 Vienna
                                                                        3.1.1.5



                                  Clock &                Clock &                           Also: 3.1.1.7 Backplanes - Florida
                                  Control1 Rice          Control2                          3.1.1.8-11 controllers, crates, power
                                                                                           supplies, cables

   US CMS DOE/NSF Review: June 2002, B.Paul Padley, Rice University                                                     11
                                 Current Project Status
• Trigger primitives are formally part of Endcap Muon project
   • ALCT
      • 384 channel version, in production
      • 672 and 288 channel versions – pre-production prototypes being
        evaluated
   • CLCT/TMB – 17 prototypes made – 3 debugged and being evaluated

• First Track Finder system (TRIDAS) prototyped successfully
  in „00
   • Also, trigger part of CMS OO simulation package was developed
   • Some hardware modifications were desired:
       • Decrease latency
       • Implement DAQ diagnostic readout

• Currently Building 2nd prototypes of system



   US CMS DOE/NSF Review: June 2002, B.Paul Padley, Rice University   12
                           Technical Issues Addressed
                             with Second Prototypes
• Level 1 trigger latency
    • Front-end buffer size is limited (tracking, pre-radiators)
    • Track Finder must deliver muons to GMT by 79 crossings (1975 ns) after
        muon collision
    • Prototype 1 (including trigger primitive electronics) was too slow – some
        surprises were encountered, e.g. Channel-Link latency about 100 ns ( x5
        places used)

• How to reach requirement is being incorporated in new design:
            Optimize data transfer protocols between boards
            Decrease some bit counts
            Faster FPGA chips (often 80 MHz versus 40 MHz)
            Improved FPGA algorithms




  US CMS DOE/NSF Review: June 2002, B.Paul Padley, Rice University                13
                      Optical Link Radiation Tests
Three serializers: up to 270 kRad TID.
No permanent damage or SEU
Two Finisar optical modules: No errors up to 70 kRad.
Failed at
 ~70kRad
(well above
~10 kRad TID
inner CSC
dose for
10 years)

-- Rice


   US CMS DOE/NSF Review: June 2002, B.Paul Padley, Rice University   14
                         Muon Port Card Prototype 1

                                                                          VME
                                                                          Interface



Optical
links




                                                                        Main FPGA
                                                                        on Daughter
                                                                        Card




     US CMS DOE/NSF Review: June 2002, B.Paul Padley, Rice University          15
                          New MPC Design (Rice)
                             9U x 400 MM BOARD                                            VME J1
                                                                                         CONNECTOR
                                                                       VME
                                                                    INTERFACE


  UCLA MEZZANINE                                                                CCB
  CARD (XCV600E)
                                                                                CCB


                                                                                TMB_1
                            OPTO           SER             CCB
                                                        INTERFACE               TMB_2
                                                                                           CUSTOM
   3 OPTICAL                                              SORTING               TMB_3    PERIPHERAL
                                                           LOGIC
   CABLES TO                                                                             BACKPLANE
                            OPTO           SER                                  TMB_4
   SECTOR                                                  INPUT
   PROCESSOR                                                AND                 TMB_5
                                                          OUTPUT
                                                            FIFO                TMB_6
                            OPTO           SER
                                                                                TMB_7
FINISAR FTRJ-8519-1-2.5
OPTICAL TRANSCEIVERS
                                                                                TMB_8
 TLK2501 SERIALIZERS                                        FPGA
                                                                                TMB_9



                                                                          SN74GTLP18612 GTLP TRANSCEIVERS


US CMS DOE/NSF Review: June 2002, B.Paul Padley, Rice University                                  16
                          New Peripheral Backplane

Bit 3
VME/PCI
interface                                                              3U
                                                                       VME
                                                                       A24D16
VME
Display

                                                                      Custom
                                                                      Backplane




   US CMS DOE/NSF Review: June 2002, B.Paul Padley, Rice University      17
                                               New Port Card
Board is partially stuffed                  TLK2501 (1 of 3)           Breadboard area
We are adding                                                          (always prudent)
components and then
testing, iteratively
VME
JTAG
Input/output FIFO’s                                                                      VME
Sorting Logic                                                                            connector


         Finisar optical
         transceiver                                                                  Custom
         (1 of 3)                                                                     backplane
                                                                                      connector


                                                                       Mezzanine card with PLD
                                                                       (PLD is on other side)
    US CMS DOE/NSF Review: June 2002, B.Paul Padley, Rice University                        18
                                                  Personnel
• Professors
     • Jay Hauser (UCLA), Paul Padley (Rice)

• Postdocs
     • Martin Von der Mey (UCLA), TBA (Rice)

• Students
     • Greg Pawloski (Rice)

• Engineers
     • JK (UCLA), Mike Matveev (Rice), Ted Nussbaum (Rice)




US CMS DOE/NSF Review: June 2002, B.Paul Padley, Rice University   19

								
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