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Since last week. Technical Coordination workshop Gave talk on CSC upgrades New 2013 timeline – ME4/2 seems okay, ME1/1 is tight, see next page TMB rates Evaldas measuring rates for restricted TMB patterns. 2013 CSC Major Tasks. 23-Nov-2012 Update CSC Gantt Chart from Martin.

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since last week
Since last week
  • Technical Coordination workshop
    • Gave talk on CSC upgrades
    • New 2013 timeline – ME4/2 seems okay, ME1/1 is tight, see next page
  • TMB rates
    • Evaldas measuring rates for restricted TMB patterns
selected milestones early 2013
Selected Milestones, early 2013
  • A tentative & partial list of what seems “reasonable” to allow the work to proceed smoothly:
    • Dec: Junction Box prototype finished, design verified
    • TBD (Dec-Jan): PRR for DCFEB
    • Feb: Patch panel prototype verified
    • Feb: ESR (Electronics Status) and MPR (Manuf. Progress) reviews
    • Mar: ODMB revised pre-production board w/Cu interface
      • Associated software needs to be written in advance
    • Mar: Software migrated from ME4/2 to ME1/1 FAST testing
    • Apr: SX5 area ready to receive ME1/1 chambers
    • May: production of half of the DCFEB, LVDB7, LVMB7
    • May: pre-production of 12 ODMB, OTMB for test setups
  • Work on a more detailed CSC-specific schedule is ongoing
tmb pattern narrowing test draft talk
TMB Pattern Narrowing Test – draft talk
  • TMB trigger patterns (LCTs) are “broad” for every chamber
    • This gives maximum efficiency at lowest muon momentum (P~5 GeV)
    • Inner chamber patterns could be narrowed with small efficiency loss – P is larger (for given PT), and magnetic bending is less
    • Rates are highest on the inner chambers (ME1/1, 2/1, 3/1, 4/1)
  • Want to request special run(s) to investigate the effect of narrowing TMB patterns
    • During low-luminosity collisions following Machine Development
    • In the shadow of 5 hrs requested by Pixel detector to understand their radiation damage
goals of the pattern narrowing test
Goals of the Pattern Narrowing Test
  • Reduce CSC event size
    • By reducing the number of CFEB and TMB readouts per event (especially out-of-time)
    • Currently marginal, will improve with elimination of DCC bottleneck, but event growth could be non-linear
  • Input to HL-LHC trigger studies
    • Decide if replacement of all CFEBs is necessary ($6-8M)
    • Change L1A latency (3.26, 10, or 20 ms) and L1A rate (1001000 kHz)?
    • Critical issue is the use of the 96 buffers in the Switched Capacitor Array (SCA) ASIC used on CFEBs
      • Storage of analog charge in 50 ns “buckets”
    • Affected by CLCT “pretrigger” rate
csc readout fragment sizes
CSC Readout Fragment Sizes
  • Affected by pile-up (soft muons, neutron hits, etc.)
  • FED753 (ME4/2) anomalous due to ME4/2
    • No shielding wall, so many back-scattered particles
    • So ME4/2 chambers were split between FEDs
  • With and without ALCT zero-suppression
    • FED753 ~2.72.0 kB, more typical FED 2.01.7 kB
    • -15% reduction, typically




Data Bottlenecks in CSC DAQ at SLHC

  • CFEB’s 96 Capacitors/channel is main DAQ rate limiter
  • DCC’s SLINK-64 is second DAQ rate limiter (configurable)

Simple Model CFEB Capacitor Storage

Transfer to

DMB Complete

Beam Crossing






16 Cap Delay

Cap Storage (Poisson)

Cap Digization (Queue)

Caps can be used

for storage when

all others in use

For SLHC this is the

main capacitor usage

Stan Durkin CMS Upgrade Week

cfeb readout inefficiency
CFEB Readout Inefficiency
  • 0.001 may beacceptable, 0.01 is bad
rate plots
Rate Plots
  • Vadim – sim - rates integrated over rings
    • Bug fix factor of 2 applied
    • 19E6 Hz at 8E34 L
    • i.e. 11.9E6 Hz at 5E34 L
    • ME2/1 has 36 chambers, so 330 KHz/chamber at 5E34 L
  • Misha – data – rates per chamber
    • 30E3 Hz at 4.1E33 L
    • i.e. 365 kHz/chamber at 5E34 L
rates for lcts in me2 1 at 5e34
Rates per chamber at 5E34 luminosity

 Data/sim comparisons are “reasonable”

Rates are likely to be a little higher than “data”…

Pretrigger requires 3 layers, not 4 (LCT)

Unknown increase from 8 to 13 TeV

(Rate per CFEB: nominally divide by 5, but there is an edge overlap factor ~1.2-1.4 not included)

Rates for LCTs in ME2/1 at 5E34

*CLCT vs. matched makes little difference. NB this was for an earlier version of TMB patterns that were wider.

**TMB patterns 8-10 only, “skinny ALCT pattern”, factor of 2 for both endcaps applied

tmb pattern test thus far
TMB Pattern Test Thus Far
  • B904 ME2/1 cosmic rays
    • Rate dropped 124 Hz with TMB pattern >=8 (TMB::CLCT_PID_THRESH_PRETRIG=8)
  • P5 cosmic rays
    • ME4/2 see 32 Hz
    • Writing flash (new patterns) on ME2/1, 3/1, 4/1
      • took 21-27s per crate, so whole inner system ~13-14 min estimated
  • Pattern distributions in CSCTF data
    • Show plot from old Anna presentation for low-Pt muons … rather even by pattern #
tmb pattern test plan with collisions
TMB Pattern Test Plan With Collisions
  • Use low-luminosity collisions after MD
  • In shadow of 5-hour pixel radiation damage test
  • Change patterns on inner (ME1/1, 2/1, 3/1, 4/1) chambers and ME4/2
    • Will affect most but not all FEDs, so can see event size difference with/without ME4/2 contribution
    • ME4/2 a bit strange because outer chamber, and might suffer more efficiency loss
  • Tighten + endcap (w ME4/2) to patterns 8-10 only
    • Leave the other endcap alone as a reference
  • Then loosen to patterns 6-10 only