Displaying reports 57381-57400 of 83394.Go to page Start 2866 2867 2868 2869 2870 2871 2872 2873 2874 End
Reports until 11:45, Friday 22 April 2016
LHO VE
kyle.ryan@LIGO.ORG - posted 11:45, Friday 22 April 2016 - last comment - 13:22, Friday 22 April 2016(26730)
HAM11/HAM12 leak hunting
Kyle, Gerardo 

0900 - 1100 hrs. local -> In and out of LVEA, used Main Crane to "fly" leak detector over YBM.  

Dissatisfied with the slow recovery of the HAM11/HAM12 annulus system, we decided to do some unscheduled (no work permit) helium leak testing -> We found a minor leak on a conflat which was mitigated by torquing the flange fasteners but were surprised to discover several very loose chamber flange bolts, i.e. we could visually see the bolt shanks between the flanges!  In total we found (4) adjacent bolts on the flange connecting HAM11 to the OMC adapter spool to be very loose and (9) adjacent flange bolts that we could spin easily with our fingers on the flange connecting HAM12/septum/HAM11 -> these were torqued using twentieth century "old school" wrenches after we were unable to find a cell phone app.  

There are (3) pump carts running in the LVEA over the weekend, (2) at HAM11/HAM12 and (1) on the SW corner of BSC4.
Comments related to this report
chandra.romel@LIGO.ORG - 13:22, Friday 22 April 2016 (26733)
Good catch! We visually inspected the CFFs on diagonal before pumping it down but did not physically touch each bolt. 
H1 CDS (VE)
james.batch@LIGO.ORG - posted 11:00, Friday 22 April 2016 - last comment - 11:48, Friday 22 April 2016(26729)
Vacuum web medm screen shots revised
The web page displaying detailed vacuum medm screens has been modified to show old and new medm screens for the site overview and LVEA.  

During the installation of new vacuum controls, some information is available on the old screens, some on the new.  For the site overview and LVEA, the new system screens are shown to the right of the original screens.  This is a temporary display change, once the new controls are installed the medm screens will be updated and the web page will be rearranged again.
Comments related to this report
kyle.ryan@LIGO.ORG - 11:48, Friday 22 April 2016 (26731)
Very nice!  Thanks Jim, this is quite useful.  
H1 General
travis.sadecki@LIGO.ORG - posted 20:45, Thursday 21 April 2016 (26726)
Ops Eve Shift Summary

TITLE: 04/22 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: Got through initial alignment, then was immediately halted by ISC_LOCK trying to get the ETMX ESD to function.  After finding the last remaining person on site (Kiwamu!), he agreed to drive to EX to try and reset the ESD driver.  He discovered that it was not a problem with the ESD driver, but an issue with ISC_LOCK not checking all the channels it needed to to get the ESD up and running.  Kiwamu edited the ISC_LOCK guardian to check that the requested DC bias was not zero.  Then, just as I was starting to continue with locking, there was another 6.0 EQ in Ecuador (haven't they been through enough already?).  Kiwamu suggested that with no one else here and the EQ ringing us up over 1 um/s, we should call it a night.
LOG:

23:51 Dave and Jim restarting SUS ETMX PI model

2:45 Kiwamu to EX looking at ESD driver (He noted that he was unable to open sitemap on one of the workstations at EX)

3:10 Kiwamu back

3:45 Calling it a night with the seismic plot going through the roof
 

H1 ISC
sheila.dwyer@LIGO.ORG - posted 18:53, Thursday 21 April 2016 (26725)
COMM beatnote power reduced, realigned.

Sheila, Matt, Jenne, Travis, Kiwamu

We went to ISCT1 because we were not finding the beatnote even when we moved PR3 back to its old alignment and we had aligned the X arm using WFS and the camera.  It turned out that the COMM beatnote diode was saturated, so we reduced the power using the half waveplate and PBS in the SHG path.  We realinged the beams, and ended up with a beatnote power of about 4dBm.  

We might need to readjust this once we have a good alignment of the full IFO to get a good reference.

Also, it seems like we have less DC light on AS AIR, so we might need to adjust its alignment again.  To get through the SRY alignment, I lowered the threshold for SRY triggering from 30 to 20.  

H1 PSL
keita.kawabe@LIGO.ORG - posted 18:10, Thursday 21 April 2016 - last comment - 10:25, Friday 22 April 2016(26723)
Free running RIN measured by first loop diodes: Now and O1

Just FYI.

Even without ISS, during O1 the 1st loop diodes didn't rail, but they do now. The power on these diodes seems to be the same as before (I assume Peter and Jason adjusted them).

Attached left is the trend of the past 26 hours. ISS first loop was on at first, but is off right now. You can see that the first loop diodes seem to be railing without ISS.

Attached right show the same channels, but from O1 when ISS first loop was off (seems to be related to ISS investigation in alog 24171).

If you compare the DC level of PDA and PDB from O1 against the recent trend when ISS was on, it seems like the DC power on the diodes are the same as before. This is not a digital filter issue, there's no digital filter on these channels except a calibration factor, and the calibration factor didn't change in the filter file. Dewhite is applied after PDA and PDB output in PDA_REL and PDB_REL channels.

Images attached to this report
Comments related to this report
jason.oberling@LIGO.ORG - 18:25, Thursday 21 April 2016 (26724)

It should be noted, and it is my understanding, that the DC value as shown on the MEDM screen is not the actual DC value output by the PD; it is calculated based on the AC value.  There are connections for the DC, but to my knowledge the actual measured DC values of the ISS PDA and PDB are not read into EPICS at all (I could be wrong on this, but this is how it was explained to me).  When we set the DC value while in the enclosure we use a multimeter and measure the DC value directly off of the PD, and adjust it to ~10V using a HWP at the input to the ISS box.  The last time we set the DC value it was set to ~9.7V on PDA.

keita.kawabe@LIGO.ORG - 09:50, Friday 22 April 2016 (26727)

To clear some confusion. Whitened output of PDA and PDB ("filt" output from ISS BOX) are whitened but DC-coupled.

PDA and PDB whitened output are measured by ADC and become H1:PSL-ISS_PDA and H1:PSL-ISS_PDB, which are plotted and reported in my entry. DC values of these are really DC values, though there is a factor of about 0.45 0.2 whitening "gain" in the ISS box.

The only channels I know of on the PSL_ISS MEDM screen that are supposed to have finite DC values despite being calculated from AC-coupled channels are band-limited linear spectral density (LSD) channels H1:PSL-ISS_PDA_LSD and H1:PSL-ISS_PDB_LSD.

Unfortunately PSL_ISS MEDM screen seems to have some mislabeling and this might have made people confused. RIN outputs (H1:PSL-ISS_PDA_REL_OUTPUT and PDB) are labeled "lsd" while band limited LSD (H1:PSL-ISS_PDA_LSD and PDB) are labeled "relative".

keita.kawabe@LIGO.ORG - 10:25, Friday 22 April 2016 (26728)

Fixed the MEDM.

"lsd" labels are now "ASD" for both PDA and PDB. Two numbers in each red circle were swapped so now "ASD" is LSD channel and "Relative" is REL channel.

DC is DC, AC is AC, "Relative" is AC.

Images attached to this comment
H1 AOS
david.barker@LIGO.ORG - posted 17:35, Thursday 21 April 2016 (26722)
CDS model and DAQ restart report: Monday 18th April - Wednesday 20th April 2016

model restarts logged for Wed 20/Apr/2016 DAQ restart of VE-MR work. New susetmxpi model, unstable fw's
2016_04_20 08:33 h1fw1
2016_04_20 13:04 h1fw0

2016_04_20 13:54 h1broadcast0
2016_04_20 13:54 h1dc0
2016_04_20 13:54 h1fw0
2016_04_20 13:54 h1nds0
2016_04_20 13:54 h1nds1
2016_04_20 13:54 h1tw1

2016_04_20 13:56 h1fw1
2016_04_20 14:09 h1susetmxpi
2016_04_20 21:03 h1fw0

model restarts logged for Tue 19/Apr/2016 Maintenance day, upgrade of VE-MX, very late start of fw1. unstable fws.
2016_04_19 09:06 h1fw0
2016_04_19 12:01 h1broadcast0
2016_04_19 12:01 h1dc0
2016_04_19 12:01 h1fw0
2016_04_19 12:01 h1fw1
2016_04_19 12:01 h1nds0
2016_04_19 12:01 h1nds1
2016_04_19 12:01 h1tw1
2016_04_19 20:40 h1fw1

2016_04_19 21:02 h1fw1
2016_04_19 21:14 h1fw1
2016_04_19 21:25 h1fw1
2016_04_19 21:54 h1fw1

model restarts logged for Mon 18/Apr/2016 ETMXPI model change, unstable fw0
2016_04_18 07:06 h1fw0
2016_04_18 11:01 h1susetmxpi

H1 CDS (DAQ)
david.barker@LIGO.ORG - posted 17:22, Thursday 21 April 2016 (26721)
CDS NDS lookback times

Some questions about look-back times for framed data served by our internal NDS servers have been asked recently, so for the record here are the current look-back times for each type of frame

nds science frames commisioning frames second trends
nds0 02 days 04 hours 10 days 12 hours 25 days 12 hours
nds1 02 days 11 hours 10 days 21 hours 24 days 11 hours

data was obtained by the script /opt/rtcds/userapps/release/cds/h1/scripts/report_daq_framewriter_lookback_times.bsh

H1 General
jim.warner@LIGO.ORG - posted 15:54, Thursday 21 April 2016 (26719)
Shift Summary

TITLE: 04/21 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Recovering
INCOMING OPERATOR: Travis
SHIFT SUMMARY: PSL work looks to be done, now trying to recover the IFO
LOG:

15:00 JeffB to LVEA to lock 3IFO cabinet, back 15:15
15:00 PeterK to PSL Jason at 15:45, out 17:30
15:30 JeffB and Fil to Diode room
15:45 Ed to LVEA to take a picture
16:00 JeffB to CER/Diode Room
18:30 Peter Jason to PSL, out at 20:00
22:00 Sheila to IOT1

H1 DCS (CDS, DCS)
gregory.mendell@LIGO.ORG - posted 15:19, Thursday 21 April 2016 (26717)
DCS Disk2Disk scripts have been restarted using their standard configuration, with CDS fw0's filesystem as the primary source of frame data
I have restarted the DCS Disk2Disk scripts using their standard configuration, with CDS fw0's filesystem as the primary source of frame data and CDS fw1's filesystem as the backup source of frame data, for DCS archiving of raw (science), second-trend, and minute-trend data. (The primary and backup source of data had been switched temporarily earlier this week due to DCS maintenance.)



H1 SEI
hugh.radkins@LIGO.ORG - posted 14:12, Thursday 21 April 2016 - last comment - 17:13, Thursday 21 April 2016(26715)
Temperature Excusion at EndY and BRSY Holds on

The Temperature spike at the ENDY did give the BRS a jostle but it seems to have recovered as has the temperature.

The attached trends are 2 days of the BRSY position, velocity,  VEA temp, ground seismo Y, wind and the BRS DRIFTMON.  To me, the most interesting thing is the ring up in the BRS signals near the beginning of the traces likely related to the seismic spike seen.  I suspect this is a VEA entrance that got pretty close to the BRS (stick to the sides if you can rather than the ends of the enclosure.)  This ring up was still not quite enough to trigger the damping so no too bad and you can see how long it takes to ring down without the capacitive damping.

Also, late in the trends, one can see the winds start to pick up and it kicked the BRS enough to trigger the damping--the velocity hit 3000.  Maybe we'll need to bump up the damping threshold??

Images attached to this report
Comments related to this report
krishna.venkateswara@LIGO.ORG - 17:13, Thursday 21 April 2016 (26720)

Hugh, you are likely right on both counts. The ring-up was very likely a person going close to the BRS box and yes, the high threshold could be set a bit higher at 4000, to prevent trigerring the capacitive damping during wind-speeds below~35-40 mph.

The ideal solution to this problem would be if we could figure out a way to keep the damping at Q~50 without adding noise. We failed to do this during our trip (see 26596, 26465), most likely because one of the capacitors was shorted, which we realized too late. If we changed the damping scheme it may be possible to have it constantly damped. Worth thinking about more.

H1 General (CDS)
edmond.merilh@LIGO.ORG - posted 08:47, Thursday 21 April 2016 - last comment - 15:20, Thursday 21 April 2016(26712)
24VDC Power supply/rack for Safety Interlock System installed

Yesterday I installed a Sorenson power supplt into the rack I placed in the closet in the LVEA. It was connected to the fuse block and powered up. After testing for the proper voltages/polarities at the drops, power was connected to the Beckhoff interlock modules and visual confirmation of function was confirmed. The total current draw for 7 of these units, as they currently sit under power, is approximately 600µA. 

Images attached to this report
Comments related to this report
michael.zucker@LIGO.ORG - 09:16, Thursday 21 April 2016 (26713)

Why are we installing a noisy switching supply in the LVEA? These Sorensons were banished for a reason...

richard.mccarthy@LIGO.ORG - 15:00, Thursday 21 April 2016 (26716)
They were not banished. Some issues were attributed to them and we removed them.  This unit powers a digital system and is far enough away from sensitive systems based on measurements done for PSL UPS on the floor.

LHO FMCS
john.worden@LIGO.ORG - posted 22:23, Wednesday 20 April 2016 - last comment - 23:03, Wednesday 20 April 2016(26708)
END Y temperature run away

It looks like the chilled water pump CWP1 at EY tripped off at ~5:00 pm this evening. For some reason the second chiller has not started so I have restarted the tripped water pump. Hopefully this will make it through the night.

Images attached to this report
Comments related to this report
nutsinee.kijbunchoo@LIGO.ORG - 23:03, Wednesday 20 April 2016 (26709)

I only got a verbal alarm for the high EY temperature. FMC alarm handler didn't go off (I looked after I heard the verbal alarm so I thought the high EY temp was part of the daily temp fluctuation and didn't think to look further). This is not very good.

LHO VE
chandra.romel@LIGO.ORG - posted 17:52, Wednesday 20 April 2016 - last comment - 02:43, Thursday 21 April 2016(26701)
CP6 below 100% full
After 15 hrs, CP6 finally registers a real value on the liquid level read back. Currently at 98.5%. I opened the Dewar valve and set the LLCV to 55% (normally runs between 60-65%). I'll be here for a while working on CAD drawings so I'll monitor it.
Comments related to this report
chandra.romel@LIGO.ORG - 18:14, Wednesday 20 April 2016 (26702)
Magnehelic reads a hair over 40 in. H20 (maybe 40.4?) when liquid level reads back 97.8%. Ratios match what we expect!
chandra.romel@LIGO.ORG - 18:16, Wednesday 20 April 2016 (26704)
Raised LLCV to 57%.
chandra.romel@LIGO.ORG - 21:32, Wednesday 20 April 2016 (26707)
Raised level to 60% valve open (liquid level reads 85.7%).
Images attached to this comment
chandra.romel@LIGO.ORG - 23:42, Wednesday 20 April 2016 (26710)
I was going to manually fill CP6 a bit before I left, but the bypass valve is frozen shut. Liquid level is 80.5% in the red, but LLCV is set to its normal value of 60%. Should be good and ready for some Beckhoff PID action in the morning.
kyle.ryan@LIGO.ORG - 02:43, Thursday 21 April 2016 (26711)
75% @ 0240 hrs. local
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