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| 40m Log |
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 Mon Oct 21 12:25:46 2019, gautam, Update, ALS, DFD electronics checkout 
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 Tue Oct 22 15:32:15 2019, gautam, Update, ALS, EX uPDH electronics checkout
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Wed Oct 23 10:23:26 2019, rana, Update, ALS, EX uPDH electronics checkout
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Wed Oct 23 11:11:01 2019, gautam, Update, ALS, EX uPDH electronics checkout
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Fri Oct 25 01:04:49 2019, gautam, Update, ALS, ALS electronics chain was saturating
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Mon Oct 28 23:20:11 2019, gautam, Update, ALS, ALS power budget
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Message ID: 14984
Entry time: Tue Oct 22 15:32:15 2019
In reply to: 14981
Reply to this: 14986
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| Author: |
gautam |
| Type: |
Update |
| Category: |
ALS |
| Subject: |
EX uPDH electronics checkout |
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Summary:
The EX PDH setup had what I thought was insufficient phase and gain margins. So I lowered the gain a little - the price paid was that the suppression of laser frequency noise of the end laser was reduced. I actually think an intermediate gain setting (G=7) can give us ~35 degrees of phase margin, ~10dB gain margin, and lower residual unsuppressed AUX laser noise - to be confirmed by measurement later. See here for the last activity I did - how did the gain get increased? I can't find anything in the elog. |
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