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| 40m Log |
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 Mon May 18 19:44:52 2009, rana, steve, Configuration, VAC, Cryo Pump turned off and valved off: 1 beer can only
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 Mon May 18 20:16:20 2009, rana, Configuration, VAC, not it 
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Tue May 19 09:34:29 2009, steve, Configuration, VAC, IFO is not pumped & CRYO is being regenerated
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Tue May 19 16:18:45 2009, steve, Configuration, VAC, IFO pressure is 4.2e-7 Torr with CRYO pump
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Message ID: 1602
Entry time: Mon May 18 20:16:20 2009
In reply to: 1601
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| Author: |
rana |
| Type: |
Configuration |
| Category: |
VAC |
| Subject: |
not it |
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There was essentially no change in the ETMY oplev spectrum with the cryo off!
So I went out to the ETMY OL table to see what else was going on. I found there one of
the most horrible opto-mechanical setups I have ever seen (and remember that I have once
seen someone mount an NPRO on a cardboard box). Some bad person had mounted the ETMY OL
lens on a 12" long skinny post and extended it towards the viewport. So there was a post
holder on the table and a lens ~12" away on a rickety lever arm.
I took this lens away and the spectrum is now good. Shame on you.
CYAN - cryo ON
BLACK - cryo OFF
BLUE - no crappy lens + mount
This OL needs to be fixed correctly by putting in a proper lens to get a small spot on the QPD. |
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