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  Mon Jan 6 18:32:17 2014, RANA, Update, IOO, MC1/3 kicked this morning at 8:30 kicked.png
    Reply  Mon Jan 6 20:52:09 2014, Jenne, Update, IOO, MC1/3 kicked this morning at 8:30 
    Reply  Tue Jan 7 10:44:13 2014, Steve, Update, IOO, MC drift 2dTrend.pngdriftNotKick.png
       Reply  Tue Jan 7 11:11:36 2014, rana, Update, IOO, MC drift 
    Reply  Tue Jan 7 16:41:08 2014, manasa, Update, IOO, WFS moving MC suspensions 2dayMCtrend.pngWFSvsMCsuspensions.png
       Reply  Tue Jan 7 17:16:04 2014, manasa, Update, IOO, MC aligned MCspots.png
          Reply  Tue Jan 7 20:57:41 2014, Jenne, Update, IOO, MC aligned 
             Reply  Tue Jan 7 23:09:10 2014, manasa, Update, IOO, MC aligned WFSdrift.png
Message ID: 9526     Entry time: Tue Jan 7 16:41:08 2014     In reply to: 9521     Reply to this: 9527
Author: manasa 
Type: Update 
Category: IOO 
Subject: WFS moving MC suspensions 

Quote:

 The trend shows a big jolt to the MC1/3 pointing this morning at 8:30.

Was anyone working anywhere near there today? There is no elog.

If not, we will have to put a 'no janitor' sign on all of the 40m doors permanently to prevent mops misaligning our interferometer.

The MC trend for the last 2 days shows that the MC suspensions were kicked again earlier today.  Looking back at the suspension channel INMONs along with the MC trans sum shows that the suspensions get kicked everytime MC locks and unlocks. (Attch:1)

So I checked the effect of WFS on the suspensions by disabling and enabling the WFS feedback servo (Attch:2).

Since the IMC is not at it best pointing, whenever the  MC autolocker runs and enables the WFS, the suspensions look like they are getting kicked.  But really, it's just the WFS doing their job. 

Edit, JCD:  What this really means is that our DC MC pointing is bad, and we need to move the MC suspensions to offload the WFS.  (All of the WFS output numbers for MC1 and 3 were around 100, which is pretty big for those numbers).  We should resurrect the WFS offloading scripts so that we can do this more regularly, and not have to do it by hand.

Attachment 1: 2dayMCtrend.png  41 kB  | Hide | Hide all
2dayMCtrend.png
Attachment 2: WFSvsMCsuspensions.png  41 kB  | Hide | Hide all
WFSvsMCsuspensions.png
ELOG V3.1.3-