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 Jun 3 16:46:31 2019, gautam, Update, IOO, IMC not locking
|
Tue Jun 4 10:56:31 2019, gautam, Update, IOO, IMC diagnostics
|
Thu Jun 6 22:11:53 2019, Koji, Update, IOO, IMC diagnostics
|
Thu Jun 13 18:01:18 2019, aaron, Update, IOO, IMC diagnostics
|
Fri Jun 14 13:10:00 2019, aaron, Update, IOO, IMC diagnostics
|
Mon Jun 17 12:37:16 2019, aaron, Update, IOO, IMC diagnostics
|
Tue Jun 18 20:35:07 2019, aaron, Update, IOO, IMC diagnostics
|
Wed Jun 19 19:12:51 2019, aaron, Update, IOO, IMC diagnostics  
|
Mon Jun 24 15:49:05 2019, aaron, Update, IOO, IMC diagnostics
|
Tue Jul 2 19:36:18 2019, aaron, Update, IOO, IMC diagnostics 
|
Fri Jun 21 19:36:26 2019, Koji, Update, IOO, IMC diagnostics
|
Sun Jun 23 08:09:53 2019, gautam, Update, IOO, NPRO diagnostics   
|
Sun Jun 23 09:36:32 2019, gautam, Update, IOO, IMC is locking normally again
|
Sun Jun 23 14:43:14 2019, Koji, Update, IOO, IMC is locking normally again
|
Mon Jun 24 08:12:10 2019, gautam, Update, IOO, IMC is locking normally again
|
Mon Jun 24 11:48:35 2019, gautam, Update, IOO, IMC in-loop error spectra and OLTF  
|
|
Message ID: 14653
Entry time: Tue Jun 4 10:56:31 2019
In reply to: 14647
Reply to this: 14659
|
Author: |
gautam |
Type: |
Update |
Category: |
IOO |
Subject: |
IMC diagnostics |
|
|
I briefly managed to lock the IMC today - it stayed locked for ~10 minutes. Attachment #1 shows spectra of a few error and control signals for today's lock, and from a stretch yesterday before the problems surfaced*. The 60 Hz lines are much bigger, and MC_F signals broadband excess noise above a few Hz. I suspect a problem somewhere in the electronics.
*I confess the comparison isn't entirely valid because I had to tweak the FSS FAST gain from its nominal value of 22 to 25 in order to get the PC drive RMS down to the ~1.5V level. At the nominal gain setting, with the laser frequency locked to the cavity length, the PC Drive RMS was ~4 V. Still, indicative of something being off in the electronics. |
|
|