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ID Date Author Type Category Subjectup Text Attachments
  4469   Wed Mar 30 20:50:43 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matchingStep  After_Faraday.pngAfter_Faraday_and_Rotated_Lens.png 
  4470   Wed Mar 30 21:21:15 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matchingStep 4: Matching into  Oven_Lens_Solution_66mm.pngMatching_Into_Green_Oven_zoomed_out.pngMatching_Into_Green_Oven_zoomed_in.png 
  4473   Thu Mar 31 02:59:49 2011 KojiConfigurationGreen LockingThe wonderful world of mode-matching I went through the entries.
1. Give us a photo of the day. i.e.
Faraday, tilted lens, etc...
  
  4476   Thu Mar 31 14:10:00 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matching

    

       
            
 P3310028.JPGP3310029.JPG 
  4477   Thu Mar 31 15:23:14 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matching

    

       
            
 Zoomed_out_fitting01.pngZoomed_in_fitting01.png 
  4485   Mon Apr 4 14:20:32 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matching   Waist_Fits_from_laser.pngWaist_Fits_Bench_Position.png 
  9476   Sun Dec 15 20:37:41 2013 ranaSummaryTreasureThere is a Wagonga in the container that Steve does not believe inFrom Linda and Bram:  WagSu.pdfWagonga.jpgMandehlingMedStrong.jpg 
  10272   Thu Jul 24 19:28:43 2014 AkhilUpdateGeneralThermal Actuator Transfer Functions As a part of temperature actuator
characterization, today Eric Q and I made
some measurements for the open loop TF of
 TF-X-ARM.pdfTF-Y-ARM.pdf 
  10275   Sat Jul 26 13:10:14 2014 AkhilUpdateGeneralThermal Actuator Transfer FunctionsKoji said that the method we used for X-arm
thermal actuator TF measurement was not correct
and suggested us to make measurements separately
 TFX_new.pdf 
  2094   Thu Oct 15 01:21:31 2009 ranaSummaryCOCThermal Lensing in the ITMThermal lensing formula:
 Untitled.pngaa.png 
  470   Thu May 8 02:06:13 2008 ranaSummaryCOCThermal Lensing in the ITMs and BS may be a problemThe iLIGO interferometers start to see thermal
lensing effects with ~2W into the MC, a recycling
gain of ~50, and a beam waist on the ITMs
  
  14041   Fri Jul 6 12:12:09 2018 AnnalisaConfigurationThermal CompensationThermal compensation setupI tried to put together a rudimentary heater
setup. 

As a heating element, I used the
 IMG_1887.jpgIMG_1884.jpgIMG_1883.jpgIR20180706_0358_labels.png 
  14071   Fri Jul 13 23:39:46 2018 AnnalisaConfigurationThermal CompensationThermal compensation setup - power supply[Annalisa, Rana]

In order to power the heater setup
to be installed in the ETMY chamber,
 IMG_2012.jpgIMG_2013.jpg20180713_213818.jpg 
  3189   Fri Jul 9 20:16:19 2010 ranaSummaryPSLThings I did to the PSL today: Refcav, PMC, cameras, etc.I re-aligned the beam into the PMC. I got
basically no improvement. So I instead changed
the .LOW setting so that PMCTRANS would no
  
  3196   Mon Jul 12 14:22:36 2010 JenneSummaryPSLThings I did to the PSL today: Refcav, PMC, cameras, etc.


   
        
            
  
  12225   Wed Jun 29 00:09:36 2016 AakashUpdateGeneralThings from past | SURF 2016I have taken out the heaters and temperature
sensors from the enclosure which was made
by Megan last summer. Soon I will test and
  
  3639   Fri Oct 1 18:53:33 2010 josephb, kiwamuUpdateCDSThings needing to be done next weekWe realized we cannot build code with the
current RCG compiler on c1ioo or c1iscex,
since these are not Gentoo machines. 
  
  680   Wed Jul 16 11:26:47 2008 Max JonesUpdate This WeekBaffles. 

I got a battery for the magnetometer today
  
  16308   Thu Sep 2 19:28:02 2021 KojiUpdate This week's FB1 GPS Timing Issue SolvedAfter the disk system trouble, we could
not make the RTS running at the nominal state.
A part of the troubleshoot FB1 was rebooted.
  
  16309   Thu Sep 2 19:47:38 2021 KojiUpdateCDSThis week's FB1 GPS Timing Issue SolvedAfter the reboot daqd_dc was not working,
but manual starting of open-mx / mx services
solved the issue.
  
  9338   Mon Nov 4 15:46:17 2013 JenneUpdateLSCThoughts and Conclusions from last week's PRMI+2arms attempt5:31pm - This is still a work in
progress, but I'm going to submit so that
I save my writing so far. I think
 12x 
  9339   Mon Nov 4 17:08:23 2013 JenneUpdateLSCThoughts on Transition to IRGabriele and I talked for a while on Wednesday
afternoon about ideas for transitioning to
IR control, from ALS. 
  
  9340   Mon Nov 4 18:24:15 2013 KojiUpdateLSCThoughts on Transition to IR You have the data. Why don't you
just calculate 1/SQRT(TRX)?
...yeah, you can calculate it but
  
  9344   Tue Nov 5 16:39:54 2013 GabrieleUpdateLSCThoughts on Transition to IR

    

       
            
  
  9636   Fri Feb 14 00:58:41 2014 JenneUpdateLSCThoughts on Transition to IR[Koji, Jenne, EricQ, Manasa]
We
 Screenshot-Untitled_Window-1.png 
  10900   Wed Jan 14 03:42:31 2015 JenneUpdateLSCThoughts on going forward with variable finesse[Jenne, Rana]

We tried locking with the variable
finesse MICH offset technique again today. 
  
  10903   Thu Jan 15 04:41:01 2015 JenneUpdateLSCThoughts on going forward with variable finesse[Jenne, Diego]

Life would be easier with the UGF
servos working.  As Diego already elogged,
  
  22   Sun Oct 28 03:03:42 2007 ranaConfigurationIOOThree Way Excitement[SIZE=2][B]We've been trying to measure the
MC mirror internal mode frequencies so that
we can measure
  
  13665   Mon Mar 5 11:58:24 2018 gautamUpdateElectronicsThree opamps walked onto an AA boardFor testing the new IR ALS noise, we had
decided that we would like to use the differential
output of the demodulated ALS beat signal,
 AA_TF.pdfAA_noise.pdf 
  13667   Wed Mar 7 12:04:14 2018 gautamUpdateElectronicsThree opamps walked onto an AA boardHere are the plots. Comments:


Measurement
and model agree quite well 
 AA_TF.pdfAA_noise.pdfD070081_LTspiceFiles.zip 
  15442   Tue Jun 30 10:59:16 2020 gautamUpdateLSCThree sensing matricesSummary:

I injected some sensing lines and
measured their responses in the various photodiodes,
 PRMI_1f_20200625sensMat.pdfPRFPMI_20200629sensMat.pdfPRFPMI_20200629sensMat_wOffset.pdf 
  1493   Fri Apr 17 11:05:22 2009 YoichiUpdateLockingThursday night locking statusThe last night, it was sort of robust to go
up until arm power = 26.
The REFL_DC gain seems to change a lot around
  
  249   Fri Jan 18 15:31:47 2008 robUpdateLSCThursday's locking
[I]rob, johnnie, andrey[/I]
 DARMnoise080118.png 
  5927   Thu Nov 17 15:19:06 2011 steveUpdateSUSTi spring plunger to hold OSEM is not affortableOur existing 300 series SS plungers from
McMastercar #8476A43 are silver plated as
Atm2 shows.
 20111116111042405.pdfP1080216.JPG 
  2213   Mon Nov 9 13:26:19 2009 AlbertoOmnistructureEnvironmentTidying up BNC cables rack around the labWe have thousands of miles of BNC cables
in the lab but we still don't find one when
we need it. I decided to solve the problem.
 DSC_0987.JPG 
  2214   Mon Nov 9 14:53:47 2009 AlbertoOmnistructureEnvironmentTidying up BNC cables rack around the labThis would be a good trial once you put
the label "BNC only" on
the wall.
  
  2216   Mon Nov 9 15:08:29 2009 KojiOmnistructureEnvironmentTidying up BNC cables rack around the lab


   
        
            
  
  11392   Tue Jul 7 17:22:16 2015 JessicaSummary Time Delay in ALS CablesI measured the transfer functions in the
delay line cables, and then calculated the
time delay from that.
 cableA_fit.jpgcableA_resid.jpgcableB_fit.jpgcableB_resid.jpg 
  10265   Wed Jul 23 18:53:11 2014 NichinUpdateElectronicsTime delay in RG405 coaxial cables A time delay can be modeled
as the exponential transfer function :  e(-sTd)
 RFcable1.pdfRFcable2.pdf 
  10266   Wed Jul 23 19:30:34 2014 NichinUpdateElectronicsTime delay in the RF multiplexer (Rack 1Y1)A time
delay can be modeled as the exponential
transfer function :  
 RFmux1.pdfRFmux2.pdf 
  1031   Tue Oct 7 12:17:57 2008 AlbertoConfigurationComputersTime reset on MEDMYoichi, Alberto

I noticed the MEDM screen time was about
  
  16283   Thu Aug 19 03:23:00 2021 AnchalUpdateCDSTime synchornization not runningI tried to read a bit and understand the
NTP synchronization implementation in FE
computers. I'm quite sure that NTP synchronization
  
  16284   Thu Aug 19 14:14:49 2021 KojiUpdateCDSTime synchornization not running131.215.239.14 looks like Caltech's
NTP server (ntp-02.caltech.edu)
https://webmagellan.com/explore/caltech.edu/28415b58-837f-4b46-a134-54f4b81bee53
  
  16285   Fri Aug 20 00:28:55 2021 AnchalUpdateCDSTime synchornization not runningI added ntpserver as a known host name
for address 192.168.113.201 (fb1's address
where ntp server is running) in the martian
  
  16286   Fri Aug 20 06:24:18 2021 AnchalUpdateCDSTime synchornization not runningI read on some stack exchange that 'NTP
synchornized' indicator turns 'yes'
in the output of command timedatectl only
  
  16291   Mon Aug 23 22:51:44 2021 AnchalUpdateGeneralTime synchronization effortsRelated elog thread: 16286


I didn't really achieve
anything but I'm listing what I've
  
  16293   Tue Aug 24 18:11:27 2021 PacoUpdateGeneralTime synchronization not really workingtl;dr: NTP servers and clients
were never synchronized, are not synchronizing
even with ntp... nodus is synchronized but
  
  16295   Tue Aug 24 22:37:40 2021 AnchalUpdateGeneralTime synchronization not really workingI attempted to install chrony and run it
on one of the FE machines. It didn't
work and in doing so, I lost the working
  
  16292   Tue Aug 24 09:22:48 2021 AnchalUpdateGeneralTime synchronization working nowJamie told me to use chroot to log in into
the chroot jail of debian os that are exported
for the FEs and install ntp there. I took
  
  8098   Mon Feb 18 11:54:15 2013 Max HortonUpdateSummary PagesTiming Issues and CalendarsCrontab: The bug of data only plotting
until 5PM is being investigated.  The
crontab's final call to the summary page
  
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