40m
QIL
Cryo_Lab
CTN
SUS_Lab
TCS_Lab
OMC_Lab
CRIME_Lab
FEA
ENG_Labs
OptContFac
Mariner
WBEEShop
|
40m Log |
Not logged in |
 |
|
Mon Oct 21 12:25:46 2019, gautam, Update, ALS, DFD electronics checkout   
|
Tue Oct 22 15:32:15 2019, gautam, Update, ALS, EX uPDH electronics checkout
|
Wed Oct 23 10:23:26 2019, rana, Update, ALS, EX uPDH electronics checkout
|
Wed Oct 23 11:11:01 2019, gautam, Update, ALS, EX uPDH electronics checkout
|
Fri Oct 25 01:04:49 2019, gautam, Update, ALS, ALS electronics chain was saturating
|
Mon Oct 28 23:20:11 2019, gautam, Update, ALS, ALS power budget
|
|
Message ID: 14984
Entry time: Tue Oct 22 15:32:15 2019
In reply to: 14981
Reply to this: 14986
|
Author: |
gautam |
Type: |
Update |
Category: |
ALS |
Subject: |
EX uPDH electronics checkout |
|
|
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. |
|
|