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| 40m Log |
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 Wed Jan 9 20:01:25 2019, Jon, Update, VAC, Second pumpdown completed 
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 Thu Jan 10 10:23:46 2019, gautam, Update, VAC, overnight leak rate
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Sat Feb 2 21:53:24 2019, Koji, Update, VAC, overnight leak rate
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Sun Feb 3 15:15:21 2019, gautam, Update, VAC, overnight leak rate
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Sun Feb 3 20:52:34 2019, Koji, Update, VAC, overnight leak rate
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Mon Feb 4 12:23:24 2019, gautam, Update, VAC, pumpdown 83 - leak tests
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Tue Feb 5 10:11:30 2019, gautam, Update, VAC, leak tests complete, pumpdown 83 resumed
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Tue Feb 5 19:30:14 2019, gautam, Update, VAC, Main volume at 20 uTorr
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Thu Feb 7 13:55:25 2019, gautam, Update, VAC, RGA turned on
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Thu Feb 7 19:28:46 2019, gautam, Update, VAC, IFO recovery
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Message ID: 14429
Entry time: Sat Feb 2 21:53:24 2019
In reply to: 14394
Reply to this: 14430
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| Author: |
Koji |
| Type: |
Update |
| Category: |
VAC |
| Subject: |
overnight leak rate |
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The pressure of the main volume increased from ~1mtorr to 50mtorr for the past 24 hours (86ksec). This rate is about x1000 of the reported number on Jan 10. Do we suspect vacuum leak?
| Quote: |
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Overnight, the pressure increased from 247 uTorr to 264 uTorr over a period of 30000 seconds. Assuming an IFO volume of 33,000 liters, this corresponds to an average leak rate of ~20 uTorr L / s.
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