Taking a screenshot for Hugh.....

TITLE: 03/15 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Cheryl
CURRENT ENVIRONMENT:
    Wind: 31mph Gusts, 25mph 5min avg
    Primary useism: 0.19 μm/s
    Secondary useism: 0.28 μm/s

It's become windy in the last few hours with gusts over 40mph (might be subsiding now).
 

QUICK SUMMARY:

Cheryl handed over an H1 which was in a LOCKING state.  Kiwamu noticed that we had rung up Roll modes & so he addressed them a bit & then we went to for NOMINAL LOW NOISE. 

Locked up but the range was down at a paltry 60Mpc.  Now it was still windy.  And we also have the BRSy in an odd state after Maintenance Day.  (Ultimately lost lock after a pesky PI Mode 27.)  

Jason, PeterK, Kiwamu (WP 6522)

We powered up the diagnostic bread board (DBB) this afternoon during the maintenance period and compared the pointing jitter signals against those from the bullseye sensor.

They show good agreement in their spectral magnitudes and showed high coherence. So pointing jitter noises seen by the bullseye are consistent with what the DBB sees.

* * * * * *

The attached are the plots showing the calibrated jitter noises and their coherence. As we know from the past measurements (e.g. 31631), the QPD2 spectra of the DBB show lower magnitudes than that of QPD1 by a factor of 5 or so across the entire frequency band. The calibrated bullseye jitters are found to be roughly at the identical magnitude to those seen by QPD1 of the DBB. Also, looking at the coherence, we found that the bullseye sensor seems to be almost at the same Gouy phase as QPD1.

After the measurement, we powered off the DBB by following the standard procedure (31717).

I also changed the input matrix for the pitch jitter mode of the bullseye in order to obtain zero offset when the beam is well centered. Now the input matrix is set such that (lower segment, upper right segment, upper left segment) = (-2, +1, +1) which had been (-1, +1, +1) since the week before the last week (34460). The calibration coefficient for it was then changed to reflect this change by a factor of 0.67. I updated the SDFs.

Head flow rates for heads 1-4 for the past 6 hours.  The hiccups for the first 40 or so minutes
are due to starting and restarting the crystal chiller as we checked for leaks.

Also shown are the flow rates for the front end laser and the power meter circuit.  These were
previously disconnected when we were trying to debug what was causing the chiller to trip so often.
Now that all four sensors in the heads have been replaced, they are not likely to be a cause of
a trip unless there are still stray bubbles working their way through the system.

Light maintenance day for CDS.

HWS rsync data to LDAS

Dave

tested the autorun of the daily rsync of HWS data from h1hwsmsr to LDAS.

Corrected WAP unit name in lvea

Jim, Dave:

the LVEA wap was the spare unit (wap-spare), this was renamed wap-lvea. Output of wap_scan is now correct.

DIAG_MAIN guardian node restarted

Dave:

I restarted DIAG_MAIN to recoup on some memory.

Added h1iopasc0 to the periodic DIAG_RESET

Dave:

To get better statistics on the timing error of h1iopasc0, its latched STATE_WORD will now be cleared every minute (added this dcu to the script which clears the end station SUS errors)

WP 6511

In preparation for the installation of the new TCS HWS digital camera, 4 network cables were pulled in this morning. Cables run from the CER FAC-C1 rack to H1:SUS-R3 field rack (HAM4). The cables were landed as follows:

H1:FAC-C1 - GigE patch panel (U36, U35) on ports 53-56
H1:SUS-R3 - GigE patch panel (U42) on ports 5-8

Installed a patch panel with a RJ45 and 3W3 power connector on the east side of the TCS HSW enclosure.

TITLE: 03/14 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Corey
SHIFT SUMMARY:  maintenance most of the day, just relocking now, H1 is on it's way to NLN
LOG:

• alogs 34809  and 34810 and 34819 have the log of activities
• Update: Bubba went to the EY chiller yard to address Instrument Air and the alarms that came in today, he's back 

J. Kissel, B. Weaver

I attach the the usual year's trend of effective bias voltage accumulated from charge, where the last few weeks are new data points. We expect and hope the trend of effective to be hovering between +/- 10 [V], which keeps the relative actuation strength change to under a few percent.

We see that ETMX looks great in all quadrants. This is likely because our nominal low-noise (NLN) duty cycle is so high -- when in NLN, we turn OFF the ETMX ESD, so it does not have a ~400 [V] on to attract stray charge.

Conversely, because the NLN duty cycle is so high, ETMY is starting to accumulate a significant amount of effective bias voltage. Although we've been flipping the sign of the bias voltage every time we're not using the ETMY ESD, that's "unfortunately" only 10-15% of the time these days with our awesome duty cycle. We should consider flipping sign of the bias voltage we use for ETMY in NLN soon. 

Perhaps the calibration group can take this opportunity to create a new calibration epoch, and reduce the reference time coupled cavity pole frequency...

Kyle, Chandra 

1510 -1540 hrs. local -> Unloaded pump from trailer and moved into the Mechanical Room using the smaller of the two roll-up doors (not the Large Equipment Access, LEA, door).  Likely created a measurable seismic signal at 1518 hrs. local and again 10 -15 minutes later as pump rolled over trailer-to-concrete transition and building doorway threshold.

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

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

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.