40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
Entry  Tue Jun 25 00:28:52 2013, rana, manasa, Update, LSC, Arm Cavity scan with X-ALS after ALS servo upgrade 6x
    Reply  Tue Jun 25 10:18:34 2013, Mystery Man, Update, LSC, Arm Cavity scan with X-ALS after ALS servo upgrade 
       Reply  Tue Jun 25 11:39:13 2013, Koji, Update, LSC, Arm Cavity scan with X-ALS after ALS servo upgrade 
    Reply  Thu Jun 27 19:17:03 2013, manasa, Update, LSC, Xarm ALS out-of-loop noise ALS_OoL.pdfALS_OoL1.pdf
Message ID: 8744     Entry time: Tue Jun 25 11:39:13 2013     In reply to: 8742
Author: Koji 
Type: Update 
Category: LSC 
Subject: Arm Cavity scan with X-ALS after ALS servo upgrade 

My understanding is that that number is an in-loop evaluation of the loop so far (as the first step of the loop evaluation).
This is not what we can directly compare with the number in the paper.

Basically the entry 8741 is telling us that the new filter suppresses the error signal better than before.
That's clearly shown in the attachment 2.

Quote:

Quote:

RMS is now less than 1 kHz or ~50 pm. (in your face, Kiwamu!)

 Isn't this still a factor of 2 away from the limit in the paper?

 

ELOG V3.1.3-