September 2003 Shutdown - Results

1
September 2003 Shutdown - Results

• Luminosity system
• Spare cables installations - finished
• Commissioning of new electronics finished
• No changes to the D0 luminosity numbers reported
  to ACNET yet
• Silicon
• Repairs of failed HDIs and relevant electronics
  finished
• Up to 90 of working channels
• Coherent noise and grass noise studies
  finished
• Installation of coolant lines resistivity
  monitors - finished
• Replacement of TLDs for radiation dose monitoring
  finished
• Expecting results soon
• Separation of power supplies with fiber tracker
  system - finished
• Fiber tracker and preshowers
• Maintenance of LVPSs and installation of upgraded
  LVPS - finished
• Modifications of AFE boards to remove un-used SVX
  inputs from the readout and increase readout
  speed - finished
• Having some issues running all AFE boards at
  53MHz data transfer rate vs 40MHz we were running
  before the shutdown
• Maintenance of the VLPC cooling system
• finished

2
September 2003 Shutdown - Results

• Calorimeter
• Replacement of all large cooling fans for
  preamplifiers cooling - finished
• Modifications and tests of all Rack Monitor
  Interfaces - finished
• Study (and hopefully fix) noises finished for
  now
• 3 sources of noise have been identified and ways
  to reduce noises are under investigation
• Muon A-layer electronics
• Silicon electronics
• LAr monitoring connections welder noise
  resolved
• Detector grounding has been substantially
  improved
• Muon
• Access to A layer forward muon tracker
  replacement of preamplifiers, gas leaks, gas
  monitors - finished
• Installation of extra trigger counters - finished
• Installation of 144 remote power cycle relays for
  front-end electronics and all relevant cabling -
  finished
• Forward proton detector
• Maintenance and installation of
  electronics/detectors for full system operation
• finished
• General detector maintenance
• Air handlers, hydraulic systems, vacuum jackets,
  cooling water systems, ODH heads, etc.- finished

3
D0 Summary

• Shutdown is in its final stage
• Progressed safely and on schedule
• Good support from the D0 mechanical and
  electrical groups as well as many Collaborators
  involved
• All critical jobs planned for this shutdown have
  been accomplished
• We expect data taking with fewer interruptions
  (higher reliability) and better detectors (data
  quality) after the shutdown
• Our short term plan
• Tuesday (tomorrow) closing detector
• Wednesday magnets tests
• Thursday and Friday final commissioning of full
  detector with cosmic (day time access only)
• Friday final survey of the closed detector
• We are ready for beam circulation in the Tevatron
• Silicon protection is up and running
• Tunnel shielding is re-installed
• We have 24/7 shifts for all sub-systems starting
  this Thursday with initial goal of detector
  commissioning and then physics data taking
• Looking forward for great Tevatron performance
  after extended shutdown
• Will be ready for collisions early next week