Dave, Stefan Trying to lock PRMI, I first found a sign error in the PRCL loom gain - somehow this wasn't properly updated last Tuesday. Next though I had trouble keeping PRX locked. we suspect the cause is an unusually high anthropogenic noise (1-3Hz) tonight - tonight is worse than a typical day noise.
(Alexa, Sheila)
With a terminator at Input 1 of the LSC-REFL Servo CM board, we measured the amplitude spectrum (Vrms/sqrtHz):
With a terminator at the SlowMon of the DAQ channels, I measured the ADC Noise of LSC_REFL_SERVO_SLOW_OUT (/ligo/home/alexan.staley/Public/ADC_ElectronicsNoise_03252014.xml ref 4)
We also measured the amplitude spectrum from Output 2 of the CM board with the COMM PLL locked, and input 1 of the CM board at 0dB (CommPLL_NoiseSpecV_Out2.txt).
I have removed the disused 'CDS aLIGO' SSID from the CDS wireless access points now that I have transitioned all of the CDS workstations to the new SSID/subnet. I have also cleaned up the corresponding WAP switchport configs.
Aidan. Dave H. Thomas.
We continued cabling TCS CO2X on-table cables. The RF driver had a Conec connector installed on it. We finished receving and sorting all the equipment from yesterday's shipments.
Full status is in the attached PDF.
Dave O, Gerado, The performance of the Output Faraday Isolator was tweaked and a transmission of 96.5 +/- 0.5% was recorded and an isolation of 9e-5 was measured. See attached report for more details.
We also used the Shack Hartmann Sensor to put and limit on the spherical power introduced by the Output Faraday Isolator (See attached document)
After resolving rubbing and magnet attachment issues on H1-SR3, we took phase 2b transfer functions and power spectra. There are small unmodeled peaks in yaw at 1.57Hz, in pitch at 1.06Hz, and in transvers at 1.06Hz, which are suppressed with damping. There is some of the environmental noise we have seen in the other suspensions tested on the same optics table in the LVEA. Overall H1-SR3 compares favorably other LOH and LLO HLTS suspensions. I have attached the plots below. All scripts and data files have been committed to the SVN repository.
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
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.
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.
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.
23 channels were removed for a new total of 122,602.
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
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
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) |
[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.
Files attached.
This will affect all operator workstations, any file on /opt/rtcds will be unavailable. This includes models, filter files, and medm screens.
[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.
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.
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).
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.
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).
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)
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)
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.
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...
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 ?
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.
B&K hammer test was made monday and tuesday last week with Betsy and Travis on HAM2 and HAM3 chamber for MC1-MC3-PR3-PRM-PR2 suspensions
The measurements have been taken with :
Pictures attached are showing position of the tri-axis accelerometer, and hammer hit locations for :
The following pdf document shows the different measurements, with comparisons between VA on / off for PR3 and PRM, and comparisons between LLO and LHO measurements.
As required for the ISI tables, resonnances of the structure below 150Hz (marked by the black dotted line) are damped by the vibration absorbers (page 9 to 12 to see their effects on PRM and PR3)
Data have been exported and plotted following the operations manual wikipage.
Label on the first picture should be MC1 and not MC3.