PHOBOS Run 5 Progress

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PHOBOSRun 5 Progress

• Peter SteinbergBrookhaven National Laboratory
• February 9, 2005

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This Week in Chipmunk 2

• A great week, especially after we came back online

lost
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Run Statistics Last Week
4nb-1 deliveredfrom RHIC 1.6B (25
overallefficiency)
Goals 1B events(as for every run!)Expecting4
00-500M events
Polarity flips still once/day
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Si Problems

• After last meeting, 1 hour access
• No effect
• Took very short access Thursday night
• No effect
• 1 hour access noon on Friday
• Removed crate to work in CH
• Problem resolved ? System back running!
• 1 hour access at 10pm Friday
• Full data taking by 1am Saturday

THANKS TO C-AD FOR SUPPORT
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Run Statistics Last Week
4nb-1 deliveredfrom RHIC 1.6B (25
overallefficiency)
Goals 1B events(as for every run!)Expecting4
00-500M events
Polarity flips still once/day
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Run Statistics This Week
End62.4
End200
350-500M
Goal O(1B) events(as for every
run!)Expecting400-500M eventsfor full 9 week
run 350-500M eventsat current ratew/ low
energy runs
30!
Polarity flips now lt once/day
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Requests

• As usual, as many magnet flips as we can have
• We recognize the difficulty, but this has always
  been part of our run plan
• Uptime vs. Development
• Low energy runs 62.4 GeV injection
• 15 days 3 setup 18 ? March 5-6
• High energy pp data
• Schedule?

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Calibrating Luminosity
Even with downtime, still approximately 1nb-1
100M events
(deliveredto PHOBOS)
(recordedby PHOBOS)