40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log, Page 120 of 344  Not logged in ELOG logo
ID Date Author Type Category Subjectup Text Attachments
  1069   Wed Oct 22 17:48:58 2008 YoichiUpdateGeneralLenses for focusing the optical lever laser (Re:divergence of He Ne 1035P)Steve had difficulty in finding lenses for
focusing the HeNe laser for the ITM op-lev.
Following his measurement of the beam divergence,
 BeamProfile.pngBeamPropagation.pngBeamPropagation.zip 
  12922   Fri Mar 31 16:10:33 2017 SteveUpdateTreasureLes Guthman Les Guthman interviews  gradstudent
Graig.

Main laser emergency shut off was
  
  4446   Mon Mar 28 15:49:18 2011 josephbUpdateCDSLessons from LST[Koji,Joe]
PART 1:
Koji was unable to build his c1lst
  
  2870   Mon May 3 01:35:41 2010 KojiUpdateSUSLessons learned from MC spot centeringLessons
learned on the beam spot centering (so far)
  
  3233   Thu Jul 15 23:51:47 2010 Mr. MaricHowToSUSLevitate me if you canYou guys must work harder.
 mag_lev.jpg 
  11365   Fri Jun 19 03:00:56 2015 ericqUpdateCDSLibrary Model Parts examinedAll simulink diagrams being used at the
40m are now under version control. I have
compiled, installed, and restarted all current
  
  17276   Thu Nov 17 09:06:35 2022 JCSummaryGeneralLight ReplaceElectrical Shop came in today to replace
the lightbulbs around 40m. I supervised the
entire visit, inside and outside the lab
  
  10670   Wed Nov 5 11:37:29 2014 manasaUpdateGeneralLight from Y end reaches PSL table[Steve, Diego, Manasa]
Since the beatnotes have disappeared,
I am taking this as a chance to put the FOL
  
  5313   Sat Aug 27 20:38:17 2011 SureshUpdateIOOLight is back on WFS[Valera, Suresh]
   We wanted to continue
the work with WFS servo loops.  As the
  
  4849   Tue Jun 21 19:54:33 2011 SureshUpdateGreen LockingLightWave NPRO power supply shifted to ETMY end tableThe Lightwave NPRO power supply which
is being shared between the AS table and
the ETMY table has been shifted back to the
  
  4832   Fri Jun 17 16:05:07 2011 kiwamuUpdateABSLLightWave out of MOPA box[Suresh / Kiwamu]
 We did the following things
:
 DSC_3139_small.png 
  14039   Thu Jul 5 17:33:36 2018 keerthana, sandrineUpdateelogLights not working
N/S ARM FL.
N/S ARM
INC.


These two lights inside
the 40m-lab are not working.
  
  11970   Tue Feb 2 18:35:47 2016 gautamUpdateGreen LockingLightwave NPRO moved from PSL table to SP tableI've moved the following components
that was a part of Koji's setup from
the PSL table to the SP table so that I may
  
  11971   Tue Feb 2 18:54:02 2016 KojiUpdateGreen LockingLightwave NPRO moved from PSL table to SP tablejiIn fact, it is one of the most difficult
type mode profiling to measure a beam directly
out from a laser source.
  
  11973   Wed Feb 3 23:23:47 2016 gautamUpdateGreen LockingLightwave NPRO moved from PSL table to SP tableAs Koji pointed out in the previous elog,
the CCD beam profiler was ill suited for
this measurement. Nevertheless, to get a
 KnifeEdgeScans_x.pdfBeamscan_x.pdf 
  11974   Thu Feb 4 09:16:46 2016 KojiUpdateGreen LockingLightwave NPRO moved from PSL table to SP tableI don't think the discrepancy is a
serious issue as long as the mode is clean.
The mode is determined by the NPRO crystal
  
  11977   Fri Feb 5 00:23:01 2016 gautamUpdateGreen LockingLightwave NPRO moved from PSL table to SP tableI've repeated the measurement for the
x-direction and also did the y-direction,
taking into account Koji's suggestion
 Beamscan_setup.pdfBeamscan_x.pdfBeamscan_y.pdfZscan.pdf 
  11951   Tue Jan 26 17:50:22 2016 gautamUpdateGreen LockingLightwave frequency noise measurementI attempted to measure the frequency noise
of the extra Lightwave NPRO we have that
is currently sitting on the PSL table. I
  
  11953   Wed Jan 27 18:19:45 2016 gautamUpdateGreen LockingLightwave frequency noise measurementAfter adjusting the alignment of the two
beams onto the PD, I managed to recover a
stronger beatnote of ~ -10dBm. I managed
  
  11956   Thu Jan 28 00:29:30 2016 gautamUpdateGreen LockingLightwave frequency noise measurementSummary of the work done today:

Alignment and other work on
PSL table
 PLL_OLG.pdfFreq_noise_comparison.pdf 
  11969   Mon Feb 1 18:11:25 2016 gautamUpdateGreen LockingLightwave frequency noise measurementBefore distrubing the beat setup with the
spare Lightwave laser, I wanted to see if
I could resolve the apparent difference in
 Free_running_frequency_noise_comparison.pdf 
  12075   Wed Apr 13 18:25:07 2016 gautamUpdateendtable upgradeLightwave health check[Koji,gautam]

Lightwave NPRO information:

Model: 126-1064-700
  
  12079   Fri Apr 15 18:38:12 2016 gautamUpdateendtable upgradeLightwave health check - NO IMPROVEMENTI re-measured the power levels today.

We have ~205mW out of the NPRO,
and ~190mW after the Faraday. It doesn't
  
  46   Thu Nov 1 16:34:47 2007 Andrey RodionovSummaryComputersLimitation on attachment size of E-LOG
I discovered yesterday when I was attaching
photos that it is NOT possible to attach
  
  6146   Thu Dec 22 20:49:33 2011 KojiUpdateIOOLimitter activated for WFS servosI set the limitters of the MC WFS servos
not to inject the feedback more than 2000.
The residual of the WFS shakes the
  
  6732   Thu May 31 16:54:12 2012 JenneUpdateGreen LockingLinks to old elogs for green beatnote laser tempsBecause I keep taking a long time to search
for these, since I can't remember the keywords
in the different entries, here are the links:
  
  1904   Fri Aug 14 15:20:42 2009 josephbSummaryComputersLinux1 now has 1.5 TB raid drive


   
        
            
  
  478   Thu May 15 10:40:21 2008 steveHowToGeneralLisa Goggin, PhDLisa Goggin successfully defended her thesis
on May, 13 2008
 lisa.JPG 
  7247   Wed Aug 22 01:54:03 2012 JenneUpdateGeneralList o' things: YarmASS, ETMXTcamera, POXwhiteningTriggeringWhile meditating
on other things, I have noticed / found the
following today:
  
  11190   Wed Apr 1 16:52:02 2015 JenneUpdateLSCList of measurementsI'd like to get a concrete list of
measurements written down, so that it's
clear what needs to be done before I graduate.
  
  14582   Sun Apr 28 16:00:17 2019 gautamUpdateComputer Scripts / ProgramsList of suspension testHere are some tests we should script.


Checking Coil Vmons, OSEM
PDmons, and watchdog enable wiring

Disable
  
  10126   Wed Jul 2 22:58:11 2014 JenneUpdateLSCLittle Bo-Peep has found her phaseNever
mind.  This is just the
low pass filter that Den put in to try to
  
  10125   Wed Jul 2 21:30:42 2014 JenneUpdateLSCLittle Bo-Peep has lost her phaseLittle Bo-Peep has lost her phase,

 CARM_loop_ArmPowers1_2July2014.pdf 
  2284   Tue Nov 17 21:09:17 2009 Jenne, ranaUpdateGeneralLittle Thorlabs Photodiode[Rana, Jenne]
We opened up the little Thorlabs
battery operated PD to see what was inside. 
 ThorlabsPD.png 
  6511   Mon Apr 9 17:03:38 2012 DenUpdateEnvironmentLms vs WienerI tried to figure out why offline LMS filter
subtract seismic noise much better from MC_F
then the Wiener filter. I did the calculations
 gur12_mcl.pngseismboxnoise.pnggur1_osem.pngmcl_noise.jpg 
  10543   Fri Sep 26 11:44:55 2014 nicolasFrogsComputer Scripts / ProgramsLoaded larry's fake filter into C1:ALS-OFFSETTER2 Larry and Nicolas
Larry's transfer function measurements
suddenly started returning 0dB 0degrees when
  
  15633   Mon Oct 19 15:38:42 2020 KojiUpdateElectronicsLoan: A file binder "40m wiring diagram" I'll bring a file binder "40m
wiring diagram" to home at the next
chance.
  
  10122   Wed Jul 2 15:35:34 2014 ericqUpdateComputer Scripts / ProgramsLocal Chiara backupsKoji has provided a 2TB USB3 external hard
drive that will get daily backups of chiara:/home/cds,
the idea being that if the internal HD at
  
  10236   Fri Jul 18 15:21:12 2014 ericqUpdateComputer Scripts / ProgramsLocal Chiara backups

    

       
            
  
  15167   Tue Jan 28 17:36:45 2020 gautamConfigurationComputersLocal EPICS7.0 installed on megatron[Jon, gautam]

We found that the caput
  
  390   Fri Mar 21 17:01:21 2008 ranaConfigurationDMFLocale change on Mafalda & seisBLRMS restartEver since we moved the accelerometers to
be around the MC and changed their names,
the seisBLRMS
  
  9360   Thu Nov 7 14:39:49 2013 JenneUpdateLSCLock Acquisition Game PlanBetween the 40m meeting, and chatting with
Gabriele, there was lots of talking yesterday
about our 40m Lock Acquisition game plan. 
 LockAcquisition_7Nov2013.pdf 
  10998   Wed Feb 11 00:07:54 2015 ranaUpdateLSCLock Loss plotHere is a lock loss from around 11 PM tonight.
Might be due to poor PRC signals.  
 1107673198.png1107673198.png 
  15348   Tue May 26 02:15:36 2020 gautamUpdateLSCLock acquisition portal entrySummary:

Provided the IMC
is cooperative, the input pointing isn't
  
  15349   Tue May 26 02:31:00 2020 gautamUpdateLSCLock acquisition sequenceHere, I provide some details of the sequence.
Obviously, I am presenting one of the quickest
transitions to the fully locked state, I
 PRFPMIlock_1274418200_1274418550.pdf 
  15360   Wed May 27 20:14:51 2020 KojiUpdateLSCLock acquisition sequenceI see. At the 40m, we have the direct transition
from ALS to RF. But it's hard to compare
them as the storage time is very different.
  
  15364   Wed Jun 3 01:34:53 2020 gautamUpdateLSCLock acquisition update portalHighlights:


With better ASC servos
implemented, I think the lock stability has
  
  15369   Wed Jun 3 03:29:26 2020 KojiUpdateLSCLock acquisition update portalWoo
hoo!

Which 1f signals are
you going to use? PRCL has sign flipping
  
  15371   Wed Jun 3 11:40:56 2020 gautamUpdateLSCLock acquisition update portalFor these initial attempts, I was just
trying to transition MICH to REFL55Q. I agree,
the PRCL situation may be more complicated.
  
  11443   Fri Jul 24 13:49:09 2015 SteveUpdatesafetyLock doors please !Thursday morning I found the control room
emergency exit not locked.

Please check the doors when leaving
  
ELOG V3.1.3-