News

1
News

• Collision Hall Access
• A special access list D0 Hazard Awareness
  Gert for now
• Changes to MCH3 Power Distribution pending
• Muon Commissioning Leaders
• Post-Docs and senior graduate students with a big
  role in commissioning. Role is
• to assist in commissioning organization
  especially integration
• to assist in shift training
• Steve Doulas, Rob McCroskey, Dennis Shpakov

2
PDT Commissioning

• Gas System
• At Present
• Ar(80)-CH4(10)-CF4 (10) Gas in 1st 6 PDTs
• Most PDTs are leak-checked.
• Design
• Clean and Dirty Gas systems are finished (JK)
  and approved by HH, TD, KK.
• Design for Gas Recycler/Cryogenic Cleaning has
  started (JK)
• Running at full speed (4 liters per minute per
  pdt) in one pass mode is too expensive
• Late Developing Problem has come up
• 80-10-10 is flammable (barely) in air.
• Considering mixtures of Ar-CO2-CF4 and mixtures
  with less methane e.g. Ar(82)-CH4(8)-CF4(10)
• For now - pdt hv is off until Monday (slow gas)
  at which time we will have 6 PDTs on Argon-C02
  which has a 1.2 microsec max drift time.

3
Gas System Design
4
PDT Infrastructure

• 58/94ths PDTs have finished cables - remaining
  underway (no update) though I know Herman, Tom
  M., Carl Lundberg and Victor Bogyagin have made
  progress
• Electronics (no update)
• 90/94ths LVPSs installed tested
• 84/94ths FEBs installed
• 18/94ths Control Cards installed
• Monitoring, Control, Readout
• Hardware database increased to 94 PDTs.
• Plague of problems suppressed (SH, FB, TD)
• COMICS download of Front-Ends updated

5
Data Taking w/ 6 PDTs

• All files copied to domino directory
  /prj_root/808/mtst_1/group_datafiles
• Module ID problem in data
• Some anecdotal evidence regarding crashes
• Get more events before crash if less PDTs have
  data
• Get fewer events before crash if L1 rate is
  higher
• Lately, PDT 121 seems to be the culprit (I didnt
  always check which had died).
• 104870, 104901, 104903 sent to reco farm.
  Probably a D0 daq milestone!
• Short Term Plan for this week
• study crashes in the first 6 PDTs
• commission L3 filter on events with PDT data
• Reposition the adc and time gates a little later
  Tested positions.
• add A-layer top east PDTs continues

6
Aphi and Cosmic Cap

• First (East side) of two central muon readout
  crates is stable and has been readout many times.
• West Side has all connections and cards (borrowed
  FMUs MFC) including VBD. I believe the PC needs
  a little setup.
• Steve, Dennis, Vladimir working on electronics
  pulsing and LED pulsing in local data-taking
  mode.
• Plan for this week
• Change trigger from or-of-ors to or-of-ands
  for Cosmic Cap cosmic runs. Done.
• Readout west scint crate Close.
• Readout east west scint crates together.
• Continue to develop local data-taking and pulsing.

7
Data Taking w/ 6 PDTs

• 6 PDT Cosmics Runs
• HV nominal, xad pipelines
• 104809 -1467 events, FEB crashed
• 104815 -1367 events, FEB crashed
• CFG.dat confusion
• 6 PDT Cosmics Special Runs
• 104869 -543 events, HV for 111, 211 off FEB
  crashed
• 104870 -4561 events, HV for 111,211,121,221 was
  off, ended normally.
• 104871 -1051 events, HV for B-layer off
• CFG.dat file 211, 111, 221, 121, 231, 131
• 6 PDT Cosmics Runs
• HV nominal, xad pipelines
• 104901 -839 events, FEB crashed
• 104903 - 340 events, FEB crashed