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| 40m Log |
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 Wed May 15 00:40:19 2019, gautam, Update, SUS, ETMY diagnosis plan 
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 Wed May 15 10:57:57 2019, gautam, Update, SUS, EY chamber opened
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Wed May 15 17:46:24 2019, gautam, Update, SUS, ETMY inspection
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Wed May 15 19:36:29 2019, Koji, Update, SUS, ETMY instepction
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Thu May 16 13:07:14 2019, gautam, Update, SUS, First contact residue removal
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Thu May 16 23:31:55 2019, gautam, Update, SUS, ETMY suspension characterization 6x
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Fri May 17 17:01:08 2019, gautam, Update, SUS, ETMY suspension characterization
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Mon May 20 11:33:46 2019, gautam, Update, SUS, ITMY inspection
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Mon May 20 17:12:57 2019, gautam, Update, SUS, ETMY LL adjustment
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Mon May 20 22:06:07 2019, gautam, Update, SUS, ITMY also kicked
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Tue May 21 00:15:21 2019, gautam, Update, SUS, Main objectives of vent achieved (?)
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Tue May 21 21:33:27 2019, gautam, Update, SUS, ETMY HR face cleaned
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Wed May 22 11:53:50 2019, gautam, Update, SUS, ETMY EQ stops backed out
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Message ID: 14620
Entry time: Fri May 17 17:01:08 2019
In reply to: 14615
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| Author: |
gautam |
| Type: |
Update |
| Category: |
SUS |
| Subject: |
ETMY suspension characterization |
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To investigate my mapping of the eigenfrequencies to eigenmodes, I checked the Oplev spectra for the last few hours, when the Oplev spot has been on the QPD (but the optic is undamped).
- Based on Attachment #1, I can't figure out which peak corresponds to what motion.
- The most prominent peak (judged by peak height) is at 0.771 Hz for both PITCH and YAW
- Assuming the peak at 0.92 Hz is the other angular mode, the PIT/YAW decoupling is poor in both peaks, only ~factor of 2 in both cases.
- Why are the POS and SIDE resonances sensed so asymmetrically in the PIT and YAW channels? There's a factor of 10 difference there...
So, while I conclude that my first-contact residue removal removed a constraint from the system (hence the pendulum dynamics are accurate and there are 6 eigenmodes), more thought is needed in judging what is the appropriate course of action. |
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