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| 40m Log |
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 Fri Aug 18 23:59:53 2017, gautam, Update, ALS, X Arm ALS lock
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 Sat Aug 19 01:35:08 2017, ericq, Update, ALS, X Arm ALS lock 
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Mon Aug 21 23:38:55 2017, gautam, Update, ALS, ALS out-of-loop noise
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Tue Aug 22 02:19:11 2017, gautam, Update, ALS, ALS OLTFs
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Tue Aug 22 23:27:14 2017, rana, Update, ALS, ALS OLTFs
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Message ID: 13230
Entry time: Sat Aug 19 01:35:08 2017
In reply to: 13229
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| Author: |
ericq |
| Type: |
Update |
| Category: |
ALS |
| Subject: |
X Arm ALS lock |
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My motivation tonight was to get an up-to-date spectrum of a calibrated measurement of the out-of-loop displacement of an arm locked on ALS (using the PDH signal as the out-of-loop sensor) to compare the performance of ALS control noise with the Izumi et al green locking paper.
I was able to fish out the PSD from the paper from the 40m svn, but the comparison as plotted looks kind of fishy. I don't see why the noise from 10-60Hz should be so different/worse. We updated the POX counts to meters conversion by looking at the Hz-calibrated ALSX signal and a ~800Hz line injected on ETMX. |
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