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  Fri Mar 28 22:10:00 2014, rana, koji, Update, SUS, recovery from  Screenshot.png
    Reply  Mon Mar 31 08:11:00 2014, Steve, Update, SUS, recovery from earthquakes local5.1eq.pngEQ4.4-5.1-3.3-16days.png
Message ID: 9760     Entry time: Fri Mar 28 22:10:00 2014     Reply to this: 9763
Author: rana, koji 
Type: Update 
Category: SUS 
Subject: recovery from  

* EQ Southeast of LA around 45 minutes ago. Callum and I felt it.

* Koji and I came in to recover. MC suspensions had been mis-aligned. ETMs both tripped their watchdogs.

* As before, the ETMX was stuck in its cage and the UR & LR OSEMs were reading zero V.

* We moved the MC sus back to their OSEM values from 2 hours ago. Koji aligned everything else by just using his chee.

* To shake the ETMX loose, I tried a different tactic than the "Great Balls of Fire". I started giving it 20k steps through the ASCYAW filterbank (with ramping OFF). I used the green light in the X arm video to look at the swinging. Using this as a readback I pumped the OFFSET button on ASCYAW to resonantly swing up the yaw motion. I had to turn the watchdog thresh up to 2000 temporarily. After a couple minutes the ETMX was free.

* We then used the bias sliders to steer it back onto the OL center (which Q nicely lined up for us recently) and then X arm locked in green right away.

Fri Mar 28 22:38:04 2014:  We've just ridden through the 5th aftershock. None of the aftershocks have tripped the watchdogs  but they break the IMC lock.

Attachment 1: Screenshot.png  691 kB  | Hide | Hide all
Screenshot.png
ELOG V3.1.3-