40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
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Entry  Fri Aug 1 22:56:27 2014, Koji, Update, General, Beam lost in the chamber??? 
    Reply  Sun Aug 3 17:19:32 2014, ericq, Update, General, Recovery efforts 
       Reply  Sun Aug 3 23:47:56 2014, Koji, Update, General, Recovery efforts 
          Reply  Mon Aug 4 17:30:00 2014, ericq, Update, General, Chronic Suspension Problems 
             Reply  Mon Aug 4 18:25:46 2014, Jenne, Update, General, Chronic Suspension Problems 
    Reply  Mon Aug 4 09:17:42 2014, Steve, Update, SUS, ITMX is still kicked ITMXkicked.pngITMXkickedStart.png
Message ID: 10329     Entry time: Mon Aug 4 17:30:00 2014     In reply to: 10327     Reply to this: 10330
Author: ericq 
Type: Update 
Category: General 
Subject: Chronic Suspension Problems 

TRX and TRY communication were recovered by doing a simultaneous reboot of all of the frontends.

Working with the interferometer has been extremely frustrating today. Having transmission values let us lock and ASS, but that has been less helpful than you would hope.

Saving the ASS offsets has repeatedly resulted in an overall bad change in alignment, moving the TTs and other things off randomly.

ITMX continues to be kicked. ITMY intermittently wanders away. It has not been possible to maintain IFO alignment for a reasonable length of time.

Also, the wall IOO striptool shows the MC2 Trans QPD Yaw having large step-function features. The MC is having an ok duty cycle, but this just may mean that the WFS are able to absorb what is happening to the MC suspensions.

The suspensions are really misbehaving. We need to get to the bottom of this, or else we are going to keep losing time to alignment.

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