|
40m
QIL
Cryo_Lab
CTN
SUS_Lab
CAML
OMC_Lab
CRIME_Lab
FEA
ENG_Labs
OptContFac
Mariner
WBEEShop
|
| 40m Log |
Not logged in |
 |
|
|
 Thu Nov 17 15:17:16 2016, gautam, Update, IMC, MCL Feedback 
|
 Wed Nov 23 01:13:02 2016, gautam, Update, IMC, MCL Feedback
| |
Wed Nov 23 15:08:56 2016, rana, Update, IMC, MCL Feedback
| |
Fri Feb 3 00:36:52 2017, gautam, Update, IMC, MCL Feedback - framing the problem
| |
Fri Feb 3 11:40:09 2017, rana, Update, IMC, MCL Feedback - framing the problem
| |
Mon Feb 6 17:03:41 2017, gautam, Update, IMC, MCL Feedback - simulink model updated
| |
Mon Feb 6 18:20:08 2017, Koji, Update, IMC, MCL Feedback - simulink model updated
| |
Wed Feb 8 19:13:02 2017, gautam, Update, IMC, MCL Feedback - TF measurements
| |
Thu Feb 9 23:35:34 2017, gautam, Update, IMC, MCL Feedback - TF measurements
|
|
|
Message ID: 12623
Entry time: Thu Nov 17 15:17:16 2016
Reply to this: 12635
|
| Author: |
gautam |
| Type: |
Update |
| Category: |
IMC |
| Subject: |
MCL Feedback |
|
|
As a starting point, I was looking at some of the old elogs and tried turning on the MCL feedback path with the existing control filters today. I tried various combinations of MCL Feedback and FF on and off, and looked at the MCL error signal (which I believe comes from the analog MC servo board?) spectrum for each case. We had used this earlier this year when EricQ and I were debugging the EX laser frequency noise to stabilize the low frequency excursions of the PSL frequency. The low frequency suppression can be seen in Attachment #1, there looks to be some excess MCL noise around 16Hz when the servo is turned on. But the MC transmission (and hence the arm transmission) decays and gets noisier when the MCL feedback path is turned on (see Attached StripTool screenshots).
|
|
|
|
|