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  40m Log, Page 218 of 341  Not logged in ELOG logo
ID Date Author Type Category Subject Text Attachments
  6211   Wed Jan 18 14:28:36 2012 kiwamuUpdateLSCestimation of optical length between PRM and scattering objectAssuming
that PRM is interfering with some other optics,
I have estimated the optical distance between
 calibration.pngscattering.png 
  6210   Wed Jan 18 12:38:44 2012 steveUpdatePEMAcrylic plexiglass transmittance   Acrylite-Gp.pptxroscogel_red#26_film.pdf 
  6209   Wed Jan 18 12:36:26 2012 kiwamuUpdateLSCwiped a steering mirror on the REFL pathI
wiped both surfaces of the REFL second steering
mirror.
 DSC_3861_small.jpgDSC_3863_small.jpg 
  6208   Tue Jan 17 19:07:47 2012 ranaUpdateLSCglitch hunting in REFL RFPDs : strange Another possibility is that there
is some beam clipping of the REFL beam before
it gets to the PD. Then there could be a
  
  6207   Tue Jan 17 16:09:20 2012 kiwamuUpdateCDSawg not working on the c1sus machineActually awg works fine without any
problems when the excitation channels belong
to the c1lsc machine.
  
  6206   Tue Jan 17 13:47:40 2012 kiwamuUpdateLSCdirty steering mirror in the REFL path Last
night I found that there were many dust particles
on the second steering mirror in the REFL
  
  6205   Tue Jan 17 03:10:27 2012 kiwamuConfigurationIOOrotated lambda/2 plate I have slightly rotated the lambda/2 plate,
which is used for attenuating the REFL beam's
power on the AS table
  
  6204   Tue Jan 17 02:44:59 2012 kiwamuUpdateCDSawg not workingAWG
is not working. This needs to be fixed.
  
  6203   Tue Jan 17 02:27:49 2012 kiwamuUpdateLSCfringe tests : all the suspensions are innocentI did a quick test to check a hypothesis
that PRM is interfering with some other optics
in the single bounce configuration.
  
  6202   Tue Jan 17 01:02:07 2012 kiwamuUpdateLSCglitch hunting in REFL RFPDs : strangeA very
strange thing is going on.
 PRMsingle_bounce.png 
  6201   Sun Jan 15 12:18:00 2012 DenUpdateAdaptive Filteringrunning time In order to figure out what downsampling
ratio we can take, we need to determine the
running time of the fxlms_filter() function.
  
  6200   Sun Jan 15 11:40:30 2012 DenUpdateAdaptive FilteringdownsamplingHere for the downsampling process we use
a low-pass Bessel digital filter of order
6, normalized cut-off frequency = 0.1. In
 2048_downsampling.png2048_512.png 
  6199   Sun Jan 15 10:28:02 2012 DenUpdateAdaptive FilteringdelaysWe can account for delays in the oaf system
by compensating it in the adaptive path of
the filter. But using only this procedure
 2048_tau.png2048_delays.png 
  6198   Sat Jan 14 00:50:08 2012 rana, kojiConfigurationIOOTowards coating thermal noise measurement with RefCav / MC beatKoji asked aloud tonight if we could   
  6197   Fri Jan 13 17:40:38 2012 ZachUpdateRF Systemfoam box and temp controller taken off of PSL tableI stole the foam EOM box and the temperature
controller circuit from the PSL table so
that I could continue with the RAM measurements
  
  6196   Fri Jan 13 16:16:05 2012 Leo SingerUpdateStewart platformFlexure type for leg jointsI had been thinking of using this
flexure for the bearings for the
leg joints, but I finally realized that it
  
  6195   Fri Jan 13 00:51:40 2012 Leo SingerUpdateStewart platformFrequency-dependent requirements for Stewart platformBelow are revised design parameters for
the Stewart platform based on ground motion
measurements.
 ground_velocity_spectrum.pngrequirements.png 
  6194   Thu Jan 12 23:19:56 2012 KojiUpdateSUSc1iscex is fine nowc1iscex
is working as before and the optic is damped.

What I checked
  
  6193   Thu Jan 12 23:13:42 2012 KojiConfigurationWIKI-40M UpdateUnable to create Wiki page

    
        
  
  6192   Thu Jan 12 21:22:16 2012 Leo SingerConfigurationWIKI-40M UpdateUnable to create Wiki page I can't create a new page on the
40m wiki.  The page that I was trying
to create is
  
  6191   Thu Jan 12 11:08:23 2012 Leo SingerUpdatePEMFunky spectrum from STS-2I am trying to stitch together spectra
from seismometers and accelerometers to produce
a ground motion spectrum from Hz to 100's
 spectrum.jpg 
  6190   Thu Jan 12 10:11:59 2012 steveUpdatePEMoptical table top with 1" wall

    

       
            
 101122012atc.PDF 
  6188   Thu Jan 12 07:44:21 2012 steveUpdateSUSsapphire wire standoff quote
On Tue, Dec 20, 2011 at 11:37 PM,
Rana Adhikari wrote:
 standoff.PDF 
  6187   Thu Jan 12 03:05:02 2012 kiwamuUpdateLSCOSA installed in AS[John / Valera / Kiwamu]
 We
installed a new weapon, an optical spectrum
  
  6186   Wed Jan 11 21:35:33 2012 Max De JongUpdateGeneralProjectorI finished mounting the new projector.
The projector and computer monitor now display
information.
  
  6185   Wed Jan 11 14:06:28 2012 Leo SingerHowToComputer Scripts / ProgramsHowTo for getting data from NDS off site This may or may not be general knowledge
already, but Jamie and I added a HowTo explaining
how to retrieve channel data from the frame
  
  6184   Tue Jan 10 09:17:23 2012 steveUpdatePhotosstrawman's visiters   P1080491.JPGP1080492.JPG 
  6183   Tue Jan 10 00:09:33 2012 kiwamuUpdateLSCspike hunting in REFL33[John / Kiwamu]
 We
tried to figure out what is causing spikes
  
  6182   Mon Jan 9 23:52:15 2012 kiwamuUpdateCDSSUS channels not accessible from dataviewer[John / Kiwamu]
 We
found that some of the suspensions channels
  
  6181   Mon Jan 9 13:19:09 2012 kiwamuUpdateSUSETMX damping restoredNo
we can't do that because the c1scx model
is not working properly.
  
  6180   Mon Jan 9 08:47:35 2012 steveUpdateSUSETMX damping restoredETMX sus damping restored   
  6179   Fri Jan 6 20:10:48 2012 ranaUpdateCDSframebuilder back online, using NTP time syncronization 
  
  6178   Fri Jan 6 19:17:07 2012 Max De JongUpdateGeneralMounted projectorI mounted the new projector to the pipe
where the old projector was attached. The
mounting hardware wasn't designed for attaching
  
  6177   Fri Jan 6 14:31:54 2012 JamieUpdateCDSframebuilder back online, using NTP time syncronizationThe framebuilder is back online now, minus
it's symmetricom GPS card.  The card
seems to have failed entirely, and was not
  
  6176   Fri Jan 6 11:49:13 2012 JamieUpdateCDSframebuilder taken offline to diagnose problem with symmetricom timing cardAlex and I have taken the framebuilder
offline to try to see what's wrong with the
symmetricom card.  We have removed the
  
  6175   Fri Jan 6 01:00:56 2012 kiwamuUpdateCDSc1scx out of syncBoth
the c1scx and its IOP realtime processes
became out of sync.
  
  6174   Thu Jan 5 20:40:21 2012 JamieUpdateCDSRTS upgrade aborted; restored to previous settings; fb symmetricom card failing?After running into more problems with the
upgrade, I eventually decided to abort todays
upgrade attempt, and revert back to where
  
  6173   Thu Jan 5 09:59:27 2012 JamieUpdateCDSRTS/RCG/DAQ UPGRADE TO COMMENCERTS/RCG/DAQ UPGRADE
TO COMMENCE
I will be attempting
(again) to upgrade the RTS, including the
  
  6172   Thu Jan 5 09:08:48 2012 steveUpdateGeneralframebuilder is backDataviewer is recovered after heavy new
year party.
 dataviewerisback.png 
  6171   Wed Jan 4 16:40:52 2012 JamieUpdateComputersfront-end fb communication restoredCommunication between the front end models
and the framebuilder has been restored. 
I'm not sure exactly what the issue was,
  
  6170   Wed Jan 4 16:22:30 2012 kiwamuUpdateLSCpower normalization in LSC : modification doneThe
dynamic power normalization system has been
modified such that the normalization happen
 pow_norm.png 
  6169   Wed Jan 4 11:47:08 2012 JamieSummaryComputer Scripts / Programsmedm directory clean-up


   
        
            
  
  6168   Wed Jan 4 09:06:50 2012 steveUpdateComputerspossible front-end timing issue


   
        
            
 rtntstat.png 
  6167   Wed Jan 4 05:02:58 2012 kiwamuUpdateLSCSidebands measurement at POPJust
a quick report: 
I did
 SB_DRMI.png 
  6166   Wed Jan 4 03:03:24 2012 kiwamuUpdateLSClocking activity tonight and beyondLast night and tonight, I was doing
a kind of rehabilitation -- locking PRMI
and DRMI with the new trigger system.
  
  6165   Wed Jan 4 02:43:40 2012 ranaUpdateGeneralActuators for Stewart platform

    

       
            
  
  6164   Wed Jan 4 00:43:06 2012 kiwamuUpdateIOOMC became flakyI
don't know what exactly is going on, but
MC became flaky and it's been frequently
  
  6163   Tue Jan 3 20:42:05 2012 Leo SingerUpdateGeneralActuators for Stewart platform I checked on the two single-axis
shakers that are present at the 40m that
Steve pointed out:
  
  6162   Tue Jan 3 18:40:08 2012 AidanSummaryComputer Scripts / Programsmedm directory clean-up I moved the following old and obsolete
MEDM directories to an archive /cvs/cds/rtcds/caltech/c1/medm

    c1vga
    c1vgl
  
  6161   Tue Jan 3 17:46:38 2012 Updated Stewart platform design requirementsUpdateGeneralUpdated design requirements for a Stewart platformI updated the design requirements for the
Stewart platform.  I weighed the unloaded
"dirty" SOS that was sitting on
 stewart.pdf 
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