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Entry  Wed Nov 16 09:21:56 2011, Suresh, Update, IOO, MC2 Shifted in Pitch, corrected by adjusting the pitch bias 
    Reply  Wed Nov 16 10:53:35 2011, Suresh, Update, IOO, MC2 Shifted in Pitch, corrected by adjusting the pitch bias C1IOO_MC_ALIGN.png
       Reply  Wed Nov 16 17:03:19 2011, Koji, Update, IOO, MC2 Shifted in Pitch, corrected by adjusting the pitch bias 
Message ID: 5910     Entry time: Wed Nov 16 10:53:35 2011     In reply to: 5905     Reply to this: 5913
Author: Suresh 
Type: Update 
Category: IOO 
Subject: MC2 Shifted in Pitch, corrected by adjusting the pitch bias 

Quote:

[Steve, Suresh]

    Steve went over to the MC2 walkway and stepped over the barrier to pick up some stuff there.  MC2 stack shifted and MC2 pitch as off.  MC unlocked and could not relock till the MC2 pitch bias was readjusted

previous MC2PIT reading: 3.6235           current MC2PIT reading:  3.9565

Without the WFS the MC to PSL alignment is poor, but it is largely due to a shift in the MC and not a shift in the PSL beam.  We know this 'coz the shift in the DC spot positions on WFS (when the MC is unlocked) is not significant nor is the shift on the C1:IOO-QPD.  When WFS loops are engaged the MC optics are turned to optimise the PSL to MC alignment, but the shift is large at the moment.

(Sorry Mirko your measurement could not be completed.  The MC unlocked in the middle)

Please Note:  If you need to access the blocked off area near MC2 stack, do not step over the barrier.  The disturbance is too great and the MC2 stack will shift.  Instead please move the barrier aside and walk as gently as possible near it, taking care not to touch the MC2 Chamber.

 

Apparently the MC2 stack had not finished shifting.   The MC unlocked while Steve was working on the PSL table installing the mirror for IOO_QPD and then it could not relock.  So I moved the MC2 once again in Pitch.  The current status of the sliders is here

C1IOO_MC_ALIGN.png

 

Yesterday I fixed the yellow buttons on the MC_ALIGN and MCLOCK screens.  They use the new updatesnap script  .  Could we also add a couple of lines to this script so that eveytime we save a snap shot the various values are written(appended) to a text file?  That way we do not need to depend solely on the conlog, which is quite slow.

 

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