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Message ID: 11210     Entry time: Thu Apr 9 02:58:26 2015
Author: ericq 
Type: Update 
Category: LSC 
Subject: All 1F, all whitened 

blarg. Chrome ate my elog. 

112607010 is the start of five minutes on all whitened 1F PDs. REFL55 has more low frequency noise than REFL165, I think we may need more CARM supression (i.e. we need to think about the required gain). This is also supported by the difference in shape of these two histograms, taken at the same time in 3f full lock. The CARM fluctuations seem to spread REFL55 out much more.  

I made some filters and scripts to do DC coupling of the ITM oplevs. This makes maintaining stable alignment in full lock much easier. 

I had a few 15+ minute locks on 3f, that only broke because I did something to break it.  

Here's one of the few "quick" locklosses I had. I think it really is CARM/AO action, since the IMC sees it right away, but I don't see anything ringing up; just a spontaneous freakout. 

Attachment 1: quickLockLoss.png  482 kB  | Show | Show all
Attachment 2: 55_1.png  242 kB  | Show | Show all
Attachment 3: 55_2.png  108 kB  | Show | Show all
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