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Entry  Tue Jul 21 18:46:47 2009, steve, Configuration, Computers, computers are down 
    Reply  Wed Jul 22 01:57:19 2009, Alberto, Configuration, Computers, computers are down 
       Reply  Wed Jul 22 09:04:10 2009, Alberto, Configuration, Computers, computers are down 
          Reply  Wed Jul 22 11:14:11 2009, Alberto, Configuration, Computers, computers are down 
             Reply  Wed Jul 22 11:18:49 2009, rob, Configuration, Computers, sticky sliders 
Message ID: 1777     Entry time: Wed Jul 22 11:18:49 2009     In reply to: 1776
Author: rob 
Type: Configuration 
Category: Computers 
Subject: sticky sliders 

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All suspentions are kicked up. Sus dampings and  oplev servos turned off.

c1iscey and c1lsc are down. c1asc and c1iovme are up-down

 The computers and RFM network are up working again. A boot fest was necessary.Then I restored all the parameters with burtgooey.

The mode cleaner alignment is in a bad state. The autolocker can't get it locked. I don't know what caused it to move so far from the good state that it was till this afternoon.  I went tuning the periscope but the cavity alignment is so bad that it's taking more time than expected. I'll continue working on that tomorrow morning.

 I now suspect that after the reboot the MC mirrors didn't really go back to their original place even if the MC sliders were on the same positions as before.

 Alberto, Rob,

we diagnosed the problem. It was related with sticky sliders. After a reboot of C1:IOO the actual output of the DAC does not correspond anymore to the values read on the sliders. In order to update the actual output it is necessary to do a change of the values of the sliders, i.e. jiggling a bit with them.

 I've updated the slider twiddle script to include the MC alignment biases.  We should run this script whenever we reboot all the hardware, and add any new sticky sliders you find to the end of the script.  It's at

 

/cvs/cds/caltech/scripts/Admin/slider_twiddle

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