Displaying reports 49741-49760 of 83165.Go to page Start 2484 2485 2486 2487 2488 2489 2490 2491 2492 End
Reports until 12:30, Friday 24 February 2017
LHO VE
chandra.romel@LIGO.ORG - posted 12:30, Friday 24 February 2017 - last comment - 14:02, Friday 24 February 2017(34385)
Y2-8 ion pump down

Kyle noted y-arm pressure rise last night. This morning I found the controller for Y2-8 ion pump faulted with error 02. Rebooted and came back at 350 V. Plugged pump into second channel and read 700 V at 0.5 A.

Marc and Richard tested the HV cable and concluded the cable connector on pump side is faulty. Marc will comment with his results.

FRS 7497

Comments related to this report
marc.pirello@LIGO.ORG - 14:02, Friday 24 February 2017 (34386)
Link

End Y

  • We shut down the power supply and disconnected the HV cable from the power supply.
  • The cable measured 12.9 ohms at the power supply end with the cable still attached to the ion pump at Y2-8.

Y2-8

  • We disconnected the cable from the Ion Pump.
  • The cable measured 0.1 ohms at the Ion Pump.
  • The cable was measured with the Agilent Fieldfox in TDR mode, see plot1.jpg.  The 273m line is there to reference the end of the cable.  We were not able to see the beyond the short when looking from Y2-8.  We should have seen the end of the cable as from previous alog 28818.

End Y

  • We returned to the end Y to measure the cable from the power supply, see plot2.jpg.
  • The splice at 18m can clearly be seen in this plot as well as the cable end, which is what we expect to see from both ends.
  • Richard ran the high pot and was not able to apply any voltage to the line without it going into fault, indicating a short.

Conclusion

It looks as if the ion pump end of the cable is shorted in or near the connector at Y2-8.  The cable near the end of the connector does not have strain relief and is slightly deformed.  Manipulating the cable near the connector did not change the cable VSWR trace, but it did change the measured ohms slightly.  More can be learned from disassembly of the connector housing without damaging the connector.  This should be investigated and the connector repaired / replaced next maintenance window.

 

Images attached to this comment
LHO VE
logbook/robot/script0.cds.ligo-wa.caltech.edu@LIGO.ORG - posted 12:10, Friday 24 February 2017 (34384)
CP3, CP4 Autofill 2017_02_24 
Starting CP3 fill. LLCV enabled. LLCV set to manual control. LLCV set to 50% open. Fill completed in 40 seconds. TC B did not register fill. LLCV set back to 16.0% open.
Starting CP4 fill. LLCV enabled. LLCV set to manual control. LLCV set to 70% open. Fill completed in 100 seconds. TC A did not register fill. LLCV set back to 37.0% open.
Images attached to this report
H1 CDS (DAQ)
david.barker@LIGO.ORG - posted 11:55, Friday 24 February 2017 (34383)
CDS O2 restart report, Tuesday 21st - Thursday 23rd February 2017

model restarts logged for Thu 23/Feb/2017 - Wed 22/Feb/2017 No restarts reported

model restarts logged for Tue 21/Feb/2017
2017_02_21 12:15 h1broadcast0
2017_02_21 12:15 h1dc0
2017_02_21 12:15 h1fw0
2017_02_21 12:15 h1fw1
2017_02_21 12:15 h1fw2
2017_02_21 12:15 h1nds0
2017_02_21 12:15 h1nds1
2017_02_21 12:15 h1tw1

maintenance day, DAQ restart to reintroduce HWS slow channels.

H1 CDS
thomas.shaffer@LIGO.ORG - posted 11:15, Friday 24 February 2017 (34382)
Updated the h1guardian0 autoBurt.req file

In response to alog34290, I updated the script that creates the channel list and the actual channel list in the autoBurt.req

H1 DetChar (DetChar, SUS)
heather.fong@LIGO.ORG - posted 10:52, Friday 24 February 2017 (34379)
Excess noise in SUS bounce/roll modes on 2017 Feb 22

Heather, Vaishali, Evan, Kiwamu, Jeff B.
DQ shifter: Beverly

During her DQ shift, Beverly noticed excess noise in the SUS bounce/roll modes beginning at Feb 22 13:00 UTC onward, and asked if it might be correlated to the ground motion (see Beverly's Wed Feb 22 DQ shift summary and attached Feb 22 plots). There was indeed a large gust of wind that hit LHO at around 13:00 UTC, as well as a degradation in alignment in the YAW degree of freedom, where the YAW signal was about 0.7 above the reference line (this degradation would also add to low frequency noise). The reason for the excess noise was suspected to be a combination of both, so Jeff made adjustments to the A2L, after which we see that the amplitude of bounce/roll modes have dropped off at around Feb 23 01:00 UTC (or Feb 22 17:00 PST), which is when we ran the A2L (see attached Feb 23 plots).

Beverly's alog entry for her DQ shift can be found here: 34364

Images attached to this report
H1 SEI (PEM)
hugh.radkins@LIGO.ORG - posted 10:44, Friday 24 February 2017 - last comment - 10:55, Monday 27 February 2017(34380)
EndY PEM T240 Mass Center checked--Okay, not centered

Checked the mass centering on the T240 Deployed Wednesday, but I did not center them.

Day                U       V       W

Wednesday 0.12  0.09  0.02V

Friday          -.11   -.22   -.32

So the warm up of the springs is evident on the mass positions but it is still within comfortable range.

It will need re-centering when we put the T240 into the BRS enclosure (Tuesday.)

Comments related to this report
hugh.radkins@LIGO.ORG - 11:12, Friday 24 February 2017 (34381)
Link

Here is spectra for the T240 (current ADC_0_ traces) compared to the ISI gnd STS (insulated) and from the PEM STS inside the BRS enclosure (Reference ADC channels.)  I'll attribute the difference at low frequency to the un-insulated state of the T240 and when inside the BRS (maybe it will get some extra insulation then) it will compare better at lower frequencies.

Images attached to this comment
krishna.venkateswara@LIGO.ORG - 16:50, Friday 24 February 2017 (34390)
Link

I'm a bit surprised they don't agree more at the microseism but there may be a scale factor mismatch between the two seismometers. It would be good to look at the coherence between the two.

But the T240 does look better at low frequencies and is more promising. One thing I thought was interesting was the difference at high frequencies between the on-floor seismometers and the BRS-platform seismometer. The BRS-platform has three swivel-feet with ~3 mm rubber shims under them, resulting in increased motion between 10-50 Hz and maybe reduced motion at higher frequencies. Perhaps the feet could be redesigned to reduce this motion.

hugh.radkins@LIGO.ORG - 10:55, Monday 27 February 2017 (34434)
Link

Here is this morning's look at the PEM T240 located on the floor next to the BRS (opposite side of the BRS to the ISI_GND_STS.

The PEM ADC is a bit unknown to me so like before when I made the PEM STS equal to the ISI GND STS by using a gain proportional to the ratio of the ISI STS/PEM STS amplitude at the useism, I now multiplied that scale factor by 5/4 (the ratio of the STS/T240 sensitivity.)  If you compare this ASD with that in aLog 34381, one might argue the traces are more similar at the useism.  Edit--added Coherence.

Tomorrow, this T240 will be moved into the BRSY enclosure replacing the STS that has been giving me troubles for the past few weeks.

Images attached to this comment
H1 SEI
thomas.shaffer@LIGO.ORG - posted 10:04, Friday 24 February 2017 (34378)
Earthquake Report: 6.9 Fiji
H1 General
thomas.shaffer@LIGO.ORG - posted 09:54, Friday 24 February 2017 (34377)
Lockloss @ 17:50UTC

We were already in Commissioning but then a 6.9 from Fiji rolled through.

LHO General
thomas.shaffer@LIGO.ORG - posted 08:06, Friday 24 February 2017 (34374)
Ops Day Shift Transition

TITLE: 02/24 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 69Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    Wind: 3mph Gusts, 2mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.18 μm/s
QUICK SUMMARY: 2.5hours lock at 70Mpc. Hopefully the earthquakes dont continue today.

 

LHO General
corey.gray@LIGO.ORG - posted 08:02, Friday 24 February 2017 (34368)
OWL Operator Summary

TITLE: 02/24 Owl Shift: 08:00-16:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 66Mpc
INCOMING OPERATOR: TJ
SHIFT SUMMARY:

Another nice quiet shift other than a decent-sized quake from the other side of the hill (off north Vancouver island).
LOG:

H1 SEI (SEI)
corey.gray@LIGO.ORG - posted 05:01, Friday 24 February 2017 (34372)
Earthquake Report: 4.9 Canada
H1 SEI (SEI)
corey.gray@LIGO.ORG - posted 04:35, Friday 24 February 2017 - last comment - 06:27, Friday 24 February 2017(34371)
Lockloss Due to 5.0 India EQ

12:31:  tidal signals elevate

12:33:  Lockloss due to 5.0 EQ from India

------

Actually this is another Point Hardy, Canada aftershock.

First attempt at locking up had the ASC control singals ringing up around the ENGAGE_REFL_POP_WFS step.  This is a new feature to me.

 

Comments related to this report
corey.gray@LIGO.ORG - 06:27, Friday 24 February 2017 (34373)
Link

Basically the DHARD pit/yaw were rung up for the first lock attempt.  

Went step by step for the 2nd attempt and made it to NLN with no issues.

H1 SEI (SEI)
corey.gray@LIGO.ORG - posted 03:08, Friday 24 February 2017 (34370)
Earthquake Report: 4.9 Alaska
LHO General
corey.gray@LIGO.ORG - posted 03:05, Friday 24 February 2017 (34369)
Power Outage In Town (Kennewick) ~10:15utc (2:15amPST)

Just got a call in from Mike L. inquiring about whether we had a power outage on the site (we are fine).  Sounds like at around 2:15am local time part(s) of Kennewick had an outage (Mike had reported not being able to see some CDS webpages (I was able to look at them from my laptop via the GC network).  At any rate, luckily no issues to deal with here *knock on wood*.

LHO General
corey.gray@LIGO.ORG - posted 00:22, Friday 24 February 2017 (34367)
Transition To OWL

TITLE: 02/24 Owl Shift: 08:00-16:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 68Mpc
OUTGOING OPERATOR: Cheryl
CURRENT ENVIRONMENT:
    Wind: 3mph Gusts, 2mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.16 μm/s
QUICK SUMMARY:

All is quiet on the H1 front.  Cleared a TIMING error on the h1iopasc0 front end (same as last night).  L1 was down and very quickly came back up 14min ago and we are back to double coincidence.

Now to go through the Ops Checksheet.

H1 General
cheryl.vorvick@LIGO.ORG - posted 00:15, Friday 24 February 2017 (34366)
Ops Eve Summary:

TITLE: 02/24 Eve Shift: 00:00-08:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 66Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY:

 

H1 General (SEI)
cheryl.vorvick@LIGO.ORG - posted 23:30, Thursday 23 February 2017 (34365)
BRS Drift
Images attached to this report
LHO VE
kyle.ryan@LIGO.ORG - posted 18:15, Thursday 23 February 2017 - last comment - 09:18, Friday 24 February 2017(34359)
Pressure rise on Y-arm -> likely Y2-8 BT ion pump 

Monitoring from home.  Likely won't need to be addressed tonight
Comments related to this report
chandra.romel@LIGO.ORG - 09:18, Friday 24 February 2017 (34375)
Link

Y arm pressure trends

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