aLIGO LHO Logbook

LHO VE

kyle.ryan@LIGO.ORG - posted 14:59, Tuesday 06 December 2016 - last comment - 16:42, Tuesday 06 December 2016(32260)

Rotating shaft vacuum pumps running @ BSC8 past maintenance day

(see WP #6377) 

Having not asked for permission, I am now asking for forgiveness!  It was my intention to shut down the temporary pump setup @ BSC8 at the end of maintenance today.  Instead, I have left the setup running. Obviously, we will shut it down if/when directed to do so.  As is, we have just this morning entered in to the "pressure region of interest" for our long-term gauge drift data collection.  The nature of the problem doesn't lend itself to 4 hours per week of data collecting.  

Recall that ON/OFF tests of this setup while in a locked "Low Noise" IFO state produced nothing of interest to the PEM folks just prior to the start of O2.

Comments related to this report

kyle.ryan@LIGO.ORG - 16:42, Tuesday 06 December 2016 (32271)

Link

~1630 - 1635 hrs. local -> Kyle in and out of LVEA 

At the request of others, I shut down the setup at PT180/BSC8.  This included isolating PT180, each of the three vacuum pumps and de-energizing all of the related components.  The ladder which had been left up against BSC8 was also removed.

NOTE: PT180 is left isolated from the site vacuum volume and all pumping sources.  As such, PT180's indicated pressure value does not represent the pressure at BSC8 etc. and will be rising until further notice.