Pulled and reseated the boards three times, and then power cycled the Corner Two satellite rack but the bump did not go away.  So I did some corner swapping, fortunately,  corner 2 and 3 are very close to one another and this was easy.  Very clear with this that the probe was the problem, unless it is the 1 meter long chamber to chassis in-air cable.  Thankfully, the CPS aren't contributing too much to the isolation at 80Hz.  Given that it is both CPS sensors on the Stage2 corner 2, maybe another snesor nearby on the platform is the problem.  I propose to power down other sensors on the platform to see if this CPS bump goes away--if that is, I've got nothing better to do.

For now we'll live with it--FRS 7576

The lvea wireless access point was renamed from wap-spare to wap-lvea, and the DNS was changed to associate the correct new name with the IP address. (Spare was installed quite some time ago when the original wap-lvea stopped working).  Note that this required restarting the nscd service on Debian 8 machines as they cache the name server queries.

I increased the laser power for both the ETMy and ETMx oplev lasers in the hopes of lessening the glitching while I prepare new lasers for these oplevs.  The changes to the voltage that monitors the laser diode current are:

• ETMy
  • OLD: 0.895 V
  • NEW: 0.910 V
• ETMx
  • OLD: 0.844 V
  • NEW: 0.850 V

The ETMy oplev laser cannot be pushed any higher, so this laser is my first target for replacement.  This closes LHO WP 6512.

The table to the left of the operator station (at right angles to the adjustable table) should not be pushed back beyond its current position. The cabling to this table is sized to its nominal position, and moving it stretches the cables and moves them into an area where it can be trodden on. Also moving the table away from the operator shrinks the width of the walkway to the back of the room.

Betsy, Nutsinee, Aidan(on the phone)

The outgoing beam appeared to be clipping at the top periscope. After 2 hours of adjusting the periscope mirrors alone we couldn't make progress. Aidan suggested that we unbolt and move the top periscope mirror so we tried that. This gives us more room to point the outgoing beam where it needs to be pointed and recovering wasn't difficult after that.

THe Hartmann plate was put back. The code has been re-initialized. Started writing data at 20:35 UTC.

I had a question today about sharing the contents of a directory with other users, linked to my alog I posted last week about how CDS ensures files under /opt/rtcds/userapps are shared between users of the controls group.

If, for example, you have a directory in your home area which you wish to share with everyone, you need to change the group ownership to controls and set the permission of the directory to 2775

chgrp controls <directory-name>

chmod 2775 <directory-name>

the directory permissions should now be

drwxrwsr-x   2 david.barker controls              2 Mar 14 16:50 directory_name

https://cdswiki.ligo-wa.caltech.edu/wiki/LinuxFilePermissionsExplained

Kyle, Chandra 

These will provide a means to mount 55 l/s ion pumps to the floor and eventually to connect these to the vent/purge valves of these two 80K pumps (once the ECR is approved, that is!)

All four turbine flow sensors for heads 1-4 were replaced with new ones.  The signals from
all four sensors look okay but the one from head 3 is the noisiest.  Some air bubbles were
seen in the flow sensors but seemingly have worked their way out of the sensors by the time
the oscillator lid was put back.

    Going by the froth in the crystal chiller spout, we might still have some air bubbles
in the system.

    A large metal, copper coloured chip came out of the head 1 flow sensor.  The chip was
approximately 2 mm x 2 mm.

    The vortex flow sensors for the power meter and front end laser were re-attached and
released in Beckhoff - they were previously force written.  If problems come up again, we
can force write them again.

    The bypass valve is fully open.



Jason / Peter

Maintenance:

15:15 - Chris and Joe to EY - done
15:15 - Christina and Karen to EX - done
15:20 - Fil and Alfredo to CER to pull cables - done
15:20 - SEI_CONF set to SC_OFF_NOBRSXY which is: sensor correction off, BRSX and BRSY set to be not in use
15:21 - Hugh to EY - done
15:30 - Christina and Karen to MX, then EY - done
15:31 - Travis to EX - done
16:00 - Chris and Joe to EX then MX - done
16:10 - Kiwamu help me diagnose the state of H1, because the Down scritp did not complete - done
16:20 - Hugh leaving EY heading to EX - done
16:21 - Ryan restarted alog - done
16:25 - Bubba to LVEA to check 3IFO - done
16:27 - Jonathan done restarting the DMT login box - done
16:37 - Kyle to LVEA to install bolts - done
16:41 - Richard done working on ITMY oplev, it came back and damped as expected - done
16:42 - Bubba and John at the exit gate which isn't working
16:45 - Karen leaving EY - done
16:50 - Betsy to LVEA for 3IFO - done
16:56 - Richard - back to LVEA - changing to laser hazard
17:00 - LVEA is laser hazard
17:10 - Betsy and Nutsinee to LVEA for TCS clipping check
17:15 - Tour of high school students
17:45 - Travis back from EY
17:46 - Travis filled the crystal chiller while Peter and Jason restarted it after swapping flow sensors
18:06 - PSL chiller back on
18:07 - Kyle and Chandra out of LVEA
18:30 - Kyle to EY
19:06 - Kyle back from EY

AS OF 19:30UTC:

• PSL flow meter work is complete
• IMC is locked
• PSL: Kiwamu heading out to PSL to start work on bullseye sensor
• EY: Hugh heading to EY, the BRS is rung up, and an adc input signal dropped from 8000 to zero at the time it started, so he's going out to investigate
• LVEA: Betsy and Nutsinee are working on TCS in the LVEA, clipping was found, working to correct

This morning Verbal Alarms raised two bogus hardware injection alarms. The code looking at these alarms is monitoring h1calcs channels instead of h1calex. I've opened an FRS ticket 7626

Moved the ITMY Oplev power from the PEM chassis to the OpLev supply at the top of the rack between BSC1 and BSC2.   This is per Filiberto's design. 

I have added notes to the procedure outside the PSL to account for the AC units needing to be off.  We now turn off the breakers while in science and turn them on before entree in to the enclosure.  Please note additional sheet.

Hoping to reduce the lowest frequency noise of the T240, I added 3/4" thick (radial) pipe insulation to the three platform legs.  See the photos for before and after with a shot of the insulation too.  The legs are 2" diameter and 12ish" long.  Don't think much thicker insulation could be used until we do something different with the C-clamps holding the table legs to the base platform.

Lowered CP3 actuator setting to 14% open after Dewar was filled this morning.

TITLE: 03/14 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
OUTGOING OPERATOR: Jim
CURRENT ENVIRONMENT:
    Wind: 9mph Gusts, 7mph 5min avg
    Primary useism: 0.26 μm/s
    Secondary useism: 0.22 μm/s
QUICK SUMMARY:

• maintenance started at 15:00UTC
• PSL laser room entered at 15:18:15, H1 was not in Observe but was locked
• 15:21:52UTC H1 lost lock
• so for about 3.5 minutes H1 stayed locked while Peter was in the laser room waling around the PSL table

TITLE: 03/14 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 67Mpc
INCOMING OPERATOR: Cheryl
SHIFT SUMMARY: Quiet shift.
LOG: Nothing to report. Not even a peep from a PI.