Possible strategies to complete D in next few months

1
Possible strategies to complete DØ in next few
months
Part 1
Some observations and facts

• No scheduled accesses in first 6 weeks of run

• DØ access requests driven by different needs

• SMT cabling requires access for about 6-8 weeks
• AFE installation driven by sign
  off/delivery/testing schedule, likely no access
  needs until end of April
• Trigger implementation independent of access
  needs
• Other detector completion hide behind SMT needs

(more details on JK transp.)

• Planning beyond middle of April is not easy

• Lab schedule unclear
• AFE schedule uncertain, no hardware in hand yet

2
Possible strategies to complete DØ in next few
months
Part 2
Major and dramatic choices (2)
1)Detector stays in collision hall
Options
1A) follow Option I no planned access until mid
April, but some failures of BD before that ? some
access. Accesses after that unclear, ask for 50
1B) request delay of machine startup until March
15, attempt 50 hook up of SMT by then. Then no
access until end of April.
1C) follow Option I no planned access until mid
April, but some failures of BD before that.
Request early start of shutdown ( 1mo) coupled to
AFE delivery
2)Detector rolls out of collision hall in next
week or so
( either roll out now or never)

• Roll in when the AFE situation is very clear and
  within 4 weeks of completing.
• DØ controls when work is done no interference
  from BD.
• Politically very bad given advertised March 1
  start up.
• Need 4 weeks (beam down) to roll in.
• Rolling in/out not without risks ( cable plant)
• No exposure to beam for working systems no
  learning experience until later
• Earliest roll in end of April

3
AFE status
AFE Installation Schedule 9-Apr Start testing
RHB 16-Apr Start installing RHB 7-May
Finish testing RHB 14-May Finish
installing RHB 14-May Start testing
LHB 21-May Start installing LHB 11-Jun
Finish testing LHB 18-Jun Finish
installing LHB First 90 of boards
4 weeks to test all RHB 20 boards per
week installation lags testing by 1 week crew of
6 to test crew of 2 to fix for retest 2 support
engineers