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 Fri May 9 01:36:28 2014, rana, Summary, SUS, Optical Lever QPD Sum trends: they're almost all too weak 
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 Mon May 12 22:42:19 2014, rana, Summary, SUS, Optical Lever QPD Sum trends: they're almost all too weak
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Mon May 12 22:52:59 2014, Jenne, Summary, SUS, Optical Lever Filters are all different
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Tue May 13 13:27:58 2014, Steve, Summary, SUS, Optical Lever Servos setting table
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Tue May 13 17:03:05 2014, Steve, Summary, SUS, ETMX oplev laser replaced
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Tue May 13 17:31:32 2014, Jenne, Summary, SUS, ETMX oplev laser replaced: New oplev gains set
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Tue May 13 22:55:57 2014, Jenne, Summary, SUS, ETMX oplev: cleanup
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Wed May 14 10:04:06 2014, Steve, Summary, SUS, oplev laser and temperature
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Tue May 20 09:12:25 2014, Steve, Summary, SUS, ETMX oplev qpd board
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Tue May 20 15:54:39 2014, rana, Summary, SUS, ETMX oplev qpd board
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Message ID: 9942
Entry time: Mon May 12 22:42:19 2014
In reply to: 9934
Reply to this: 9943
9946
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| Author: |
rana |
| Type: |
Summary |
| Category: |
SUS |
| Subject: |
Optical Lever QPD Sum trends: they're almost all too weak |
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For some reason or another, I decided that we should see if the optical lever servos were injecting too much noise into the test masses. The ITMs are much worse than the ETMs and I am afeared that they might be making the main noise for our arms in the 20-40 Hz region. Jenne is checking up on these feedback loops to see what's up.
To estimate the actuator gains of the mirrors, I turned on 1 count drives from LSC/CAL oscillators into the LSC drives of each test mass at the frequencies shown in the plot with the resulting peaks showing up in in POX/Y with the single arm locks in red. I will leave these going permanently, but with 0.1 count ampltiudes; we need to make it so in the scripts. |
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