Displaying reports 72561-72580 of 83228.Go to page Start 3625 3626 3627 3628 3629 3630 3631 3632 3633 End
Reports until 16:00, Tuesday 25 March 2014
H1 General
andres.ramirez@LIGO.ORG - posted 16:00, Tuesday 25 March 2014 (10994)
Ops Shift Summary
7:50-9:14 Heading to End Y for cleaning - Karen
8:00 Crystal chiller refilled (Maintenance) - Justin
8:45-10:30 Heading to EndX/EndY to scan electronics – Filiberto
8:50-12:05 Working in LVEA – David H.
8:58 End Y transitioned to Laser Hazard- Jax
9:00-10:18 Searching for TCS parts in LVEA – Thomas
     LN2 delivery to CP1 – Praxiar
9:10-13:01 Going to End Y for TMS alignment – Corey/Jax
9:15-12:00 Chassis work on ISC racks in LVEA – Aaron
9:40-10:06 Heading to End X to check leaking valve – Hugh
9:42 Working at Mid Y – Jodi
10:00 Replacing RAM modules in h1broadcast0 - James
10:14 Rebooting H1 boot server – James
10:35-12:00 Cable work by HAM4 (LVEA) – Filiberto
10:45 Removing iLIGO RGA from BSC10 – Kyle
11:05 Heading into the LVEA – Betsy
11:42 Working on HAM5 – Hugh/Jim
12:07 DAC restart – Dave
12:44 Back to HAM4 – Filiberto
13:13 Monolithic welding of ITMx and ITMy at LVEA - Travis
13:15 Moving Laser barrier from HAM2 to BSC3 area – Justin
13:48 Heading into H2 PSL enclosure (Laser Hazar) – Gerardo
13:55 Going to End X - Cris
LHO VE
john.worden@LIGO.ORG - posted 15:44, Tuesday 25 March 2014 - last comment - 09:26, Wednesday 26 March 2014(10992)
Y1 Beam Tube Accumulation

My estimate of N2 leak/outgassing for the Y1 module at LHO. The accumulation took place over 4.8 days.

Total pressure at the end according to the CC gauges was 5e-8 torr and the total RGA ion current was 2e-10 amps yielding 0.004 amps/torr(H2).

Ignoring the gauge factors I get an N2 leak/outgassing rate of 4e-9 tl/sec. There may also be a contribution from CO generated by the CC gauges.

Also, the RGA setup was coupled to the tube at an oring angle valve so

there are a number of small orings in close proximity to the RGA. Kyle did perform a mild bake on this setup. In addition, included in the accumulation

is the LN2 pump at YMID.

I would say we have no measureable air leak on Y1.

The RGA data is shown on a log plot for better visibilty - on a linear plot the curves appear straight.

Images attached to this report
Non-image files attached to this report
Comments related to this report
john.worden@LIGO.ORG - 09:26, Wednesday 26 March 2014 (11011)

For Rai and Mike,

Here is the CC gauge data in ascii. Two gauges PT124(first data set in file) and PT243 are recorded.

The times are as follows:

RGA start record at 3/19/2014 13:25 PDT = 20:25 UTC =  2456736.3704

RGA end record at 3/24/2014 9:15 PDT = 16:15 UTC  =  2456741.1958

The temperature data is here:

https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=10984

 

Average temperature was ~50F during the accumulation.

Non-image files attached to this comment
H1 CDS (DAQ)
david.barker@LIGO.ORG - posted 15:27, Tuesday 25 March 2014 (10991)
Front end model behavior while h1boot was down

I have been checking the status of the front end systems while h1boot was down between 17:13 ad 17:45UTC today.

as a consequence to this, CONLOG was recording changes which may not have been applied, and GUARDIAN was running on unchanging input data.

H1 CDS
patrick.thomas@LIGO.ORG - posted 14:41, Tuesday 25 March 2014 (10989)
conlog channel list updated
23 channels were removed for a new total of 122,602.
H1 CDS
cyrus.reed@LIGO.ORG - posted 12:11, Tuesday 25 March 2014 (10987)
h1boot, h1build, h1broadcast0 Update details

Taking advantage of the planned reboot to run an FSCK on h1boot, the following fixes/changes were applied to h1boot, h1build, and h1broadcast0:

Corrected missing console output at boot by following the instructions left in /etc/issue on these machines, namely:

-----------------------------------------------------
Your system seems to be missing critical device files 
in /dev !  Although you may be running udev or devfs, 
the root partition is missing these required files !

To rectify this situation, please do the following:
mkdir /mnt/fixit
mount --bind / /mnt/fixit
cp -a /dev/* /mnt/fixit/dev/
umount /mnt/fixit
rmdir /mnt/fixit

You may refer to these instructions at /etc/issue.  
If you previously had an issue file, it has been 
backed up at /etc/issue.devfix.  Once you've fixed 
your system, you will have to restore your old issue 
file in order to get rid of this warning.

Thanks for using Gentoo ! :)
http://bugs.gentoo.org/show_bug.cgi?id=40987
-----------------------------------------------------

And then removed the warning with:

# mv /etc/issue.devfix /etc/issue

Enabled logging boot messages to file by updating RC_BOOTLOG from "no" to "yes" in /etc/conf.d/rc:

# RC_BOOTLOG will generate a log of the boot messages shown on the console.  
# Useful for headless machines or debugging.  You need to emerge the 
# app-admin/showconsole package for this to work.  Note that this probably
# won't work correctly with boot splash.

RC_BOOTLOG="yes"

This requires emerging app-admin/showconsole, as noted in the config file:

--> Check what the emerge will touch
# emerge --pretend app-admin/showconsole
--> Install showconsole
# emerge app-admin/showconsole

Note, this generated the following warnings from emerge:

* IMPORTANT: 2 config files in '/etc' need updating.
 * See the CONFIGURATION FILES section of the emerge
 * man page to learn how to update config files.

This is because someone did not clean up after themselves on 29 Jul 2010:

# find /etc -iname '._cfg????_*'
/etc/ssh/._cfg0000_sshd_config
/etc/._cfg0000_ntp.conf

etc # ls -al        
total 1388
drwxr-xr-x 49 root root   4096 Mar 25 10:00 .
drwxr-xr-x 26 root root   4096 Feb 11  2012 ..
-rw-r--r--  1 root root   1517 Jul 29  2010 ._cfg0000_ntp.conf
 ...
etc # cd ssh
ssh # ls -al
total 176
drwxr-xr-x  2 root root   4096 May 24  2011 .
drwxr-xr-x 49 root root   4096 Mar 25 10:00 ..
-rw-------  1 root root   3740 Jul 29  2010 ._cfg0000_sshd_config
 ...

I did not correct this problem. The diffs did not show any substantial config options missing.

All systems were rebooted, forcing an FSCK on restart:

# shutdown -r -F now
H1 CDS (DAQ)
david.barker@LIGO.ORG - posted 11:57, Tuesday 25 March 2014 (10986)
CDS model and DAQ restart report, Monday 24th March 2014

model restarts logged for Mon 24/Mar/2014
2014_03_24 02:27 h1broadcast0
2014_03_24 02:33 h1broadcast0

unexpected restart of broadcaster due to memory swapping, hopefully fixed by todays upgrade

H1 CDS (DAQ)
david.barker@LIGO.ORG - posted 11:50, Tuesday 25 March 2014 (10985)
h1boot and h1broadcast0 down times

Here are the times h1boot and h1broadcaster0 were offline for today's maintenance work

host from to
h1boot 17:13UTC (10:13PDT) 17:45 UTC (10:45PDT)
h1broadcaster0 17:51UTC (10:51PDTP 18:11UTC (11:11PDT)
H1 SUS
arnaud.pele@LIGO.ORG - posted 10:29, Tuesday 25 March 2014 (10931)
B&K ETMY TMSY

[Travis Arnaud] This is a late alog from Friday

On friday afternoon,  B&K measurements on the cage structure of ETMY and TMSY were completed in chamber, with the ISI locked. For each suspensions, two degrees of freedom have been tested, in the horizontal plane, labelled as X and Y (respectively axis perpendicular to the arm and along the arm, see pictures).

TMSY Results (2014-03-21_Phase3a_H1ETMY.pdf)

* Clean data showing the resonnances in the Y direction @ 111Hz, 179Hz and 279Hz and in the X direction @ 163 Hz, 200Hz, 261Hz and 293Hz. No concerns here since there is there is no high Q resonnances below 150Hz. Data is compared with LLO TMSX

ETMY Results (2014-03-21_Phase3a_H1ETMY.pdf)

* Main resonnances at 72Hz (in the Y direction) and 76Hz (in the X direction) look well damped, with a similar Q than the other quad structures etmx and itmx previously tested.

[Method]

For this measurement we used the B&K hammer and tri-axis accelerometer setup, acquiring data with the Pulse software on the windows laptop. The template used has been copied fom T1000697.

Data collected lives under the svn in

/ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ETMY/BandK

/ligo/svncommon/SusSVN/sus/trunk/TMTS/H1/TMSY/BandK

The accelerometer was mounted on the structures as described on the pictures, with detailled axis orientation.

Images attached to this report
Non-image files attached to this report
LHO VE
john.worden@LIGO.ORG - posted 10:12, Tuesday 25 March 2014 (10984)
Y1 Beam Tube Accumulation

Files attached.

Non-image files attached to this report
H1 CDS
james.batch@LIGO.ORG - posted 09:53, Tuesday 25 March 2014 (10982)
h1boot will be down for an hour or less
This will affect all operator workstations, any file on /opt/rtcds will be unavailable.  This includes models, filter files, and medm screens.
H1 SUS
arnaud.pele@LIGO.ORG - posted 09:50, Tuesday 25 March 2014 (10978)
TMSY TF

Attached are transfer functions from TMSY TFs from last night, added to the other results of last week.
I also attached a spectra of the individual osems with the suspension undamped

Non-image files attached to this report
H1 CDS
james.batch@LIGO.ORG - posted 09:49, Tuesday 25 March 2014 (10981)
h1broadcast0 for the dmt system will be down for 15 minutes
Installing memory in the h1broadcast0 computer, affects the dmt system.
H1 General
andres.ramirez@LIGO.ORG - posted 09:48, Tuesday 25 March 2014 (10980)
PSL Check
Laser Status: 
SysStat is good
Output power is 28.1 W (should be around 30 W)
FRONTEND WATCH is Active
HPO WATCH is red

PMC:
It has been locked 2 days, 21 hr 1 minutes (should be days/weeks)
Reflected power is 1.3 Watts and PowerSum = 11.4 Watts.
(Reflected Power should be <= 10% of PowerSum)

FSS:
It has been locked for 0 d 1 h and 21 min (should be days/weeks)
Threshold on transmitted photo-detector PD = 0.54 V (should be 0.9V)

ISS:
The diffracted power is around 9.94 % (should be 5-15%)
Last saturation event was 0 d, 11 h and 43 minutes ago (should be days/weeks)
H1 SUS
arnaud.pele@LIGO.ORG - posted 09:46, Tuesday 25 March 2014 - last comment - 15:11, Tuesday 25 March 2014(10970)
TMSY work

[Corey Jeff Betsy Travis Arnaud]

Today, we had several in chamber rounds in order to improve the roll/vertical transfer functions of the TMSY suspension. Results from last thursday night attached were still showing badness, especially in the roll degree of freedom with an extra mode at 0.89Hz (first pdf), but no TF has been ran between Friday's work, and this morning. The pdf attached shows TF comparison of TMSY in April last year (orange, used as "reference"), TMSY March 11th (black, first in chamber TF, before alignment work), and TMSY last thursday, march 20th, (pink) 

In chamber work from today :

1) Corey and Jeff started by moving some of the earthquake stops (quick dtt tf was ran after, cf green curve of TMSY.png). No change, since 0.89Hz still present

2) Betsy tried centering some of the flags close from the edge of their osem (cf blue curve, taken after the work). No change

3) Finally, Travis and I modified the cable routing. First we gave some slack to the cable between ISI and top mass by changing the orientation of the clamp. This significantly moved the top mass, that was probably beeing hold by those cables. Some of the osems went completely out (cf Screenshot) so we had to recenter them. We took a quick dtt TF, but it still looked somehow not good enough. We then loosened the cablings between the table and the top mass. The red curve shows how the 0.89Hz moved to 0.8Hz after the overal work.

I will run long measurements overnight, to have an idea of what's happening on the other degrees of freedom, but it sounds like their will be more cable routing work, as well as alignments to check.
Note that LLO recently had the go through the same process, cf Stuart's alog, and mitigated the issue by modifying the cables routing.

Images attached to this report
Non-image files attached to this report
Comments related to this report
corey.gray@LIGO.ORG - 21:03, Monday 24 March 2014 (10973)

Here are some additional notes about in-chamber work today.

In-Chamber Notes:

Round 1 (Jeff & Corey)

With news of ugly peaks over the weekend from SEI TFs, Jeff & I went out to inspect the TMS for any issues (Jim locked up the ISI prior to us going in).  There was nothing obvious.  But Jeff did notice an internal EQ Stop being close to a wire (one from upper spring to Upper Mass); so he screwed it in a little.  He then tightened all the EQ Stop screws.  That was all that was done.  (Jim then un-locked the ISI again) 

We came back to the Control Room and were going to run some measurements, but noticed that the BOSEMs were no longer centered (!).  We went out to the TMS again and centered the BOSEMs yet again (locking & unlocking the ISI as needed).  We then had Arnaud run a few measurements at this point.

(as for the BOSEMs moving around....chatted with Keita, and he suspected it was due to the ISI being unlocked.)

NOTE:  while inspecting the TMS, Jeff noticed the quad of magnets on some of the BOSEMs.  He was surprised to see them, since other suspensions replaced them with metal blocks, per Robert Schofield's request.

Round 2 (Betsy & Corey)

Since Arnaud's measurements still showed ugly peaks at 0.88 & ~2.5Hz, Betsy & I went out yet again for inspection.  She noticed Flags low for F1 & F2 (so the BOSEM Adjustment Plate was moved up).  She also noticed the quad of magnets off-center for the Left BOSEM, so adjustment plate was moved forward.  I re-centered BOSEMs.  (ISI was locked/unlocked accordingly).

NOTE:  Betsy & Arnaud said I should use the "calibrated speedometer" signals to center BOSEMs vs the BOSEM inputs, so I did this (Keita mentioned we should use the BOSEM inputs instead.

corey.gray@LIGO.ORG - 23:49, Monday 24 March 2014 (10974)ISC

Chalking Up To Hindsight.  For Future End Station Work:  OK TMS Bill Of Health Immediately AFTER In-Chamber Close-Out Work

Even it takes more time, we should add the checking of the TMS & posting the ACCEPTED Free Swing spectra and/or transfer function before handing off to SEI, just to help rule out TMS if there are any questionable SEI TFs.  In other words, if there are any issues with the TMS, we'll be address them faster and will be able to hand over to the SEI crew and know "for sure" TMS can't be a culprit.

...Well, I guess if when unlocking the ISI, there's the chance ISI Optics Table could have a different level compared to its locked state.  (this is something Keita suggested we saw when see our BOSEMs not centered after the ISI was unlocked today).

hugh.radkins@LIGO.ORG - 08:53, Tuesday 25 March 2014 (10977)INS, SEI

attached are trends of the HEPI and ISI IPS & CPS positions for the past 5 days.

The unlock of the ISI on Friday is seen on the trends where there are measurable shifts.  Since then the positions have been fairly stable and repeatable.  The worst thing I see in this data is ~9urads tilt in the ISI Ry.  This amount of motion at the CPS is in the scale of 10s of counts and is not out of our lock/unlock tolerance.  Don't know if this is significant to the TMS alignment etc.

The first plot is the CPS rotations: There is a 17urad Rz, 9urad Ry & 1urad Rx.  The second plot is all the HEPIs which are all insignificant.

Images attached to this comment
jim.warner@LIGO.ORG - 09:40, Tuesday 25 March 2014 (10979)

After all the TMS work yesterday, I took a quick DTT tf this morning. No change on the SEI side. The added peak is at 2.3 hz (not a change, I just hadn't gotten around to getting a precise measurement).

Images attached to this comment
arnaud.pele@LIGO.ORG - 15:11, Tuesday 25 March 2014 (10990)

NOTE:  Betsy & Arnaud said I should use the "calibrated speedometer" signals to center BOSEMs vs the BOSEM inputs, so I did this (Keita mentioned we should use the BOSEM inputs instead).

Both methods are similar :

1-The BOSEM inputs can be used if trying to reach half of the open light value (corresponding to -1*the offset value).

2-The calibrated signal can be used if trying to reach 0

for the record, calibrated signal (osem output) = [(osem input - open light/2)*15000/(open light/2)]*calibration_from_cts_to_um

in other words, when osem input varies from 0 to max (cts), the uncalibrated signal varies from -15000 to 15000 (cts) and the calibrated signal from -345 to 345 (um)

H1 ISC
stefan.ballmer@LIGO.ORG - posted 14:03, Monday 24 March 2014 - last comment - 15:49, Tuesday 25 March 2014(10961)
REFLAIR_A_RF45_I whitening stage 1 diagnostic
Jax, Stefan

We verified that the whitening stage 1 of REFLAIR_A_RF45_I is indeed not switching on the analog side. We checked that the command bit (pin 25 / GND=pin 20) makes it to the board. Thus Jax will pull the board tomorrow and debug it..

Details:
Rack: ISC R2 slot 32
S/N: S1101590
Assembly: D1002559 (board2)
Comments related to this report
stefan.ballmer@LIGO.ORG - 15:49, Tuesday 25 March 2014 (10993)
Turns out we confused I and Q: in the electronics the Q channel comes before the I channel.

Bottom line: the whitening board works fine. The Beckoff system does not switch line 33 on cable H1:ISC 56. I left a scope in the electronics room hooked up to that line.

 
H1 AOS (ISC)
stefan.ballmer@LIGO.ORG - posted 15:21, Sunday 23 March 2014 - last comment - 08:38, Tuesday 25 March 2014(10944)
POBAIR_B_RF18 demod fuse tripped / sign for REFLAIR flipped ....
Dave O, Stefan

While attempting to lock the PRC we noticed that POB_Air_B_RF_I_Err was low on signal. We traced this back to a low de-mod signal (see attached plot). We traced this down to a tripped fused in the ISC_R2_Rack. This tripped on the 17th March. We tried to reset it but it simply re-tripped again.

When we locked PRX and PRY, we were also surprised that we needed to flip the feed-back sign in PRCL to lock on the carrier (compared to the settings the LSC guardian uses).
Images attached to this report
Comments related to this report
rich.abbott@LIGO.ORG - 09:56, Monday 24 March 2014 (10952)ISC
I assume by fuse you guys mean breaker right?  I can't tell if this unit is now functional (as might be implied by successful locking mentioned in this post) or still problematic.  I would like to understand this better in case it points to a potential flaw somewhere.
richard.mccarthy@LIGO.ORG - 08:10, Tuesday 25 March 2014 (10975)
The negative regulator had the kapton insulation material under it not the gray that works.  The -15 was shorting to the case. We replaced both +-15 insulating material.  Unit was restored and is functional.
filiberto.clara@LIGO.ORG - 08:38, Tuesday 25 March 2014 (10976)
Unit D0902796 Serial Number S1000977 had insulation for both positive and negative regulators replaced.
H1 AOS (SUS)
jeffrey.kissel@LIGO.ORG - posted 19:01, Wednesday 19 March 2014 - last comment - 13:48, Tuesday 25 March 2014(10881)
H1 ETMX Optical Lever Confusion
Has the analog whitening settings changed on the ETMX optical lever? I've compared a high-frequency spectrum with a measurement I took in February, and there's reported tons more motion above 2 [Hz], when the ISI motion is roughly equivalent if not better at these frequencies (see attached). Looks there's an extra 1:10 analog filter that's not being compensated or something...
Non-image files attached to this report
Comments related to this report
arnaud.pele@LIGO.ORG - 15:28, Thursday 20 March 2014 (10904)

Looking at a previous OPLEV spectra that was made in February on ETMX ITMX and ITMY (calibrated in urad/sqrtHz), it looks like the signal amplitude @ 10Hz (on the three of them) was similar to what you have on your red curve (~0.1 nrad/sqrtHz). Maybe the green trace (reference) was taken with a digital compensation filter engaged, but no analog whitenning ?

thomas.vo@LIGO.ORG - 13:48, Tuesday 25 March 2014 (10988)
Refer to ALOG-10267 for the changes in whitening settings on Feb 21st 2014. This accounts for the two orders of magnitude difference you see above 10 Hz.
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