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ID Date Author Type Category Subjectup Text Attachments
  16958   Tue Jun 28 18:19:09 2022 TomislavUpdateElectronicsElectronics noiseI measured electronics noise of WFSs and
QPD (of the WFS/QPD, whitening, ADC...) by
closing PSL and measuring the error signal.
 electronics_noise_spectra.pngerror_signal.png 
  16963   Wed Jun 29 18:53:38 2022 ranaUpdateElectronicsElectronics noisethis is just the CDS error signal, but
is not the electronics noise. You have to
go into the lab and measure the noise at
  
  16992   Tue Jul 12 14:56:17 2022 TomislavSummaryElectronicsElectronics noise measurements[Paco, Tomislav]

We measured the electronics noise
of the demodulation board, whitening board,
 23x 
  16998   Wed Jul 13 13:26:44 2022 ranaSummaryElectronicsElectronics noise measurementsas I said to you yesterday, I
don't think image 2a shows the output
of the demod board. The output
  
  4584   Thu Apr 28 22:38:38 2011 AidanUpdateGreen LockingElectronics schematic for vertex beatbox With some assistance from Kiwamu
and Koji, I've drawn up the electronics design
for the Beat Box for the vertex green locking.
 Canvas_1.pngCanvas_2.png 
  4593   Sat Apr 30 05:14:33 2011 KojiUpdateGreen LockingElectronics schematic for vertex beatbox- AC coupling for the comparator
circuit of the green locking
In order to relieve the power consumption
 freq_divider.png 
  1036   Wed Oct 8 22:23:43 2008 YoichiConfigurationElectronicsElectronics work bench cleanupYesterday, I cleaned up the electronics work
bench. I figured that keeping the work bench
in order has larger effect on the work efficiency
 Cleanup.jpg 
  14405   Fri Jan 18 15:34:37 2019 gautamUpdateThermal CompensationElliptical reflector part numberNobody documented this, but here is the
part number with mechanical drawings of the
elliptical reflector installed at EY: 
  
  3452   Fri Aug 20 20:36:05 2010 AlastairUpdateGeneralElog Elog was down, I restarted it.   
  5739   Tue Oct 25 21:23:17 2011 DmassBureaucracyelogElog RestartedElog went nonreponsive. SSH'ed into nodus
to run restart script. Elog came back ~15
minutes later.
  
  10323   Fri Aug 1 15:32:07 2014 ericqUpdateComputer Scripts / ProgramsElog and svn backupsKoji and Evan have both brought up a good
point that we may not be backing up the svn
and ELOG properly.
  
  2302   Thu Nov 19 16:04:48 2009 AlbertoConfigurationelogElog debugging output - Down time programmed today to make changesWe want the elog process to run in verbose
mode so that we can see what's going. The
idea is to track the events that trigger
  
  2303   Thu Nov 19 18:49:55 2009 AlbertoConfigurationelogElog debugging output - Down time programmed today to make changes

    
        
  
  3441   Thu Aug 19 09:52:51 2010 AlastairUpdateComputersElog down I restarted it using start-elog-nodus
and this worked out fine - even though I
did it from Pete's on my phone ;-)
  
  3464   Tue Aug 24 14:29:18 2010 josephbUpdateelogElog down for 1 minuteI'm going to take the elog down for one
minute and restart it under gdb (using a
copy of gdb stolen from fb40m since I couldn't
  
  5556   Tue Sep 27 11:43:59 2011 JenneUpdateelogElog has been dying a lot lately...WTF?   
  2187   Fri Nov 6 00:23:34 2009 AlbertoConfigurationComputersElog just rebootedThe elog just crashed and I rebooted it   
  1181   Fri Dec 5 20:40:38 2008 YoichiHowToComputersElog multi-keyword searchThe current Elog search allows you to look
for only one keyword in the text.
You cannot search for two keywords by simply
  
  3795   Wed Oct 27 11:52:45 2010 josephbUpdateelogElog needed to be restartedI had to restart the elog on Nodus because
it was no longer responding.
  
  2739   Wed Mar 31 10:34:02 2010 josephbUpdateelogElog not responding this morningWhen I went to use the elog this morning,
it wasn't responding.  I killed the
process on nodus, and then restarted, per
  
  2196   Fri Nov 6 18:02:22 2009 josephbUpdateComputersElog restartedWhile I was writing up an elog entry, the
elog died again, and I restarted it. 
Not sure what caused it to die since no one
  
  11058   Mon Feb 23 15:04:10 2015 ZachUpdateGeneralElog restartedThe elog crashed while I was creating
an entry to the Cryo log. I restarted it
with the 
  
  3994   Tue Nov 30 12:10:44 2010 josephbUpdateelogElog restarted againThe elog
seemed to be down at around 12:05pm. 
I waited a few minutes to see if the browser
  
  4168   Wed Jan 19 10:31:24 2011 josephbUpdateelogElog restarted againElog wasn't
responding at around 10 am this morning. 
I killed the elogd process, then used the
  
  2562   Tue Feb 2 18:15:47 2010 AlbertoUpdateelogElog restarted it Zach made me notice that the elog
had crashed earlier on this afternoon. 
I just restarted it with the restarting
  
  3461   Tue Aug 24 06:34:01 2010 AlastairUpdateGeneralElog......was down.  Have restarted it.   
  2473   Mon Jan 4 17:21:30 2010 JenneConfigurationIOOElusive Mode Matching Solution found!I think I have
finally found a Mode Matching solution for
 Awesome_MM_Solution.png 
  2481   Wed Jan 6 03:44:41 2010 KojiConfigurationIOOElusive Mode Matching Solution found!I
am in the way to get a reasonable optical
layout.
  
  7207   Thu Aug 16 18:59:18 2012 JenneUpdateSAFETYEmergency Exit door unlocked againKoji just found the emergency exit door
unlocked again.  NOT GOOD.
  
  15485   Wed Jul 15 19:23:44 2020 gautamUpdateGeneralEmergency light on in control roomThe emergency lamps above the exit sign
on the NW entrance to the control room are
on. I tried opening and closing the door,
  
  15486   Wed Jul 15 19:51:51 2020 KojiUpdateGeneralEmergency light on in control roomIt happened before too. Doesn't it
say it has occasional self-testing or something?
  
  15487   Wed Jul 15 20:58:40 2020 gautamUpdateGeneralEmergency light on in control roomTrue - it is now not on anymore.




  
  16047   Mon Apr 19 09:17:51 2021 JordanUpdateVACEmpty N2 TanksWhen I came into the lab this morning,
I noticed that both N2 tanks were empty.
I had swapped one on Friday (4-16-21) before
 N2_Pressure.PNG 
  16064   Wed Apr 21 12:56:00 2021 JordanUpdateVACEmpty N2 TanksInstalled T2 today, and leaked checked
the entire line. No issues found. It could
have been a bad valve on the tank itself.
 Screenshot_2021-04-21_12-53-26.png 
  16090   Wed Apr 28 11:31:40 2021 JonUpdateVACEmpty N2 TanksI checked out what happened on c1vac. There
are actually two independent monitoring codes
running:
  
  16305   Wed Sep 1 14:16:21 2021 JordanUpdateVACEmpty N2 TanksThe right N2 tank had a bad/loose valve
and did not fully open. This morning the
left tank was just about empty and the right
  
  16344   Mon Sep 20 14:11:40 2021 KojiUpdateBHDEnd DAC Adapter Unit D2100647I've uploaded the schematic and PCB
PDF for End DAC Adapter Unit D2100647.

Please review the design.
 D2100647_End_DAC_Adapter.pdf 
  11335   Fri May 29 02:05:08 2015 ericqUpdateLSCEnd Laser temperatures setBoth
green beatnotes have been found with nominal
amplitudes. (X: -30dBm Y: -20dBm), at temperatures
  
  9248   Wed Oct 16 19:19:14 2013 MasayukiUpdateGreen LockingEnd PDH 60 Hz comb noise in YARM[Manasa, Masayuki]
- Motivation
 comb_noise.pdf 
  9273   Thu Oct 24 04:07:32 2013 MasayukiUpdateGreen LockingEnd PDH control signal, X-end PDH servo gain optimizationControl signal measurement of end PDH
control
The Yarm ALS wasn't robust. Yesterdays
 outojloop.png 
  16538   Sun Jan 2 20:46:46 2022 KojiUpdateSUSEnd SUS Electronics building19:00~ Start working on the electronics
bench

The following units were tested
 PXL_20220103_081133119.jpg 
  10629   Tue Oct 21 18:40:46 2014 manasaUpdateGeneralEnd laser fiber setup [Manasa, Diego]
This is our first time touching tables
for Frequency Offset Locking. 
  
  47   Thu Nov 1 16:42:48 2007 Andrey RodionovSummaryEnvironmentEnd of Daylight Saving Time this weekendUseful information for everyone, as a friendly
reminder:
  
  16869   Mon May 23 13:16:59 2022 PacoUpdateBHDEnd of vent - checks[Paco, Yuta]

Prep for closing and pump down.


Aligned IFO to maximize
 OSEMs20220523.txtScreenshot_2022-05-23_13-24-06_IFOaligned_GTRY_still_clipping_but_less.pngPR3position.JPG 
  3432   Wed Aug 18 11:40:59 2010 josephb,kiwamu,yoichiUpdateCDSEnd station working with latest RCG codeWe were able to get the latest SVN checkout
(revision 2009), working with the c1x00 (IOP)
and c1vgl models at the new X end on the
  
  8892   Mon Jul 22 17:17:30 2013 annalisaUpdateendtable upgradeEnd table picture   YendTable.jpg 
  8896   Tue Jul 23 00:51:46 2013 KojiUpdateendtable upgradeEnd table pictureThe spot on the IPANG QPD was checked.
The spot is higher than the center and South
side of the lens.
 P7224222.JPGP7224223.JPGP7224224.JPGP7224238.JPG 
  8910   Tue Jul 23 19:37:08 2013 AnnalisaUpdateendtable upgradeEnd table picture

    

       
            
 IMG950073.jpgIMG950072.jpg 
  7731   Tue Nov 20 11:40:19 2012 ranaConfigurationGreen LockingEnd table upgrade for auxiliary green laser : ETMX layout on new table 
 Mounts:

    No more mounts using the
  
  9345   Tue Nov 5 16:47:09 2013 JenneUpdateLSCEnd transmission QPDsI think Steve is trying to align the end
transmission QPDs, since the arms are locked
nicely right now.  I noticed that the
  
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