Run Meeting

1
Run Meeting Endcap Muon

• November 10, 2006

2
CSCs This Week

• Dedicated integration session of full trigger
  chain CSC/CSC(DT)-TF/GMT/GT 3days
• quickly re-established the CSC-muon path
• readjust the CSC FED Latency accordingly
• followed by successful integration of the two
  muon triggers (CSCDT) using the full trigger
  path (run 4593).
• for event displays and more details , see e-log
  entries in CSC and Shift sections
• Dedicated integration of the CSC and DT
  TrackFinders
• for the overlap region triggers
• DT stubs could already be seen at the CSC-TF
  throughout most of Phase 2
• DT implemented the appropriate delays at the
  DT-TF allowing it to observe the CSC-TF stubs too

3
CSCs This Week

• High Rate Tests
• option 1 reconfigure the trigger primitives to
  allow very high rates.
• Cathode-only trigger, 1-out-6 layers and lower
  the comparator thresholds 65kHz (36 CSCs)
• non-standard trigger resulted in some timing
  issues which repeatedly raised sTTS osy/errors at
  the FED electronics (which is what they are
  supposed to do!)
• option 2 use external 100kHz (random) trigger
• DAQ throttling reduced the rate to 48kHz and
  collected 40M events
• mostly empty events as these are not triggered by
  the CSCs
• but DDU headers and trailers are payload too!
• Endcap RPC and CSC integration
• unfortunately, endcap RPCs were already
  disconnected from the HV.

4
MTCC 2 Lessons

• time needed to digest these are only the first
  bullets
• Synchronization, Synchronization, Synchronization
  
• dedicated CSC Taskforce charged to come up with
  procedures to scale up the synchronization from
  36 to 468 chambers.
• From 4 to 60 peripheral crates
• From 1 trigger sector to 6 per endcap
• From 1 endcap to 2 endcaps
• A live system is very useful.
• The EMu community is planning to continue a
  minimal slice test on the minus endcap.
• Non-expert exposure is very useful
• This was the first time that the CSC operation
  was handed over to a 24/7 shift crew. Important
  feedback and a good stimulus for writing
  documentation!