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ID Date Authorup Type Category Subject Text Attachments
  14281   Wed Nov 7 08:32:32 2018 SteveUpdateVACc1vac1 FAIL lights on (briefly)...checkedThe vacuum and MC are OK




 Vac_MC_OK.png 
  14291   Tue Nov 13 16:15:01 2018 SteveUpdateVACrga scan pd81 at day 119 

 
 pd81-d119.pngpd81-560Hz-d119.png 
  14294   Wed Nov 14 14:35:38 2018 SteveUpdateALARM emergency calling list for 40m Lab It is posted at the 40m
wiki with Gautam' help. Printed copies
posted around doors also.
  
  14299   Fri Nov 16 10:26:12 2018 SteveUpdateVAC single viton O-ringsThe 40m vacuum envelope has one large single
O-ring on the OOC west side. All other doors
have double O-ring with annuloses.
 Single-O-ring.png 
  14301   Fri Nov 16 15:09:31 2018 SteveConfigurationVACnot venting cryo and ion pumpsNotes on the ion pumps and cryo pump:



Our
4 ion pumps were closed off for a lomg time.
I estmated their pressure to be around ~1
  
  14306   Mon Nov 19 17:09:00 2018 SteveUpdateVACVent 81Gautam, Aaron, Chub and Steve,




 beforeVent82.pngvent81completed.png 
  14318   Mon Nov 26 15:58:48 2018 SteveUpdateVACVent 81Gautam, Aaron, Chub & Steve,

ETMY heavy door replaced by light
one.
  
  14321   Tue Nov 27 10:50:20 2018 SteveUpdatePEMearth quake MexicoNothing tripped.

 
 5.5M.Mexico.png 
  14322   Tue Nov 27 17:06:51 2018 SteveConfigurationVACAgilent 84FS turbo installed as TP2Chub & Steve,   
  14323   Thu Nov 29 08:13:33 2018 SteveUpdatePEMEQ 3.9m So CAEQ did not trip anything. atm1

Just
a REMINDER:
our vacuum system is at atm to help the vacuum
 3.9mSoCA.pngVac_as_today.pngas_is.png 
  10968   Tue Feb 3 15:20:13 2015 Steve, KojiUpdateVACPneumatic pressure is being read again[Koji, Steve]

Summary

The N2 pressure
 N2pressureReadingIsBack.png 
  8954   Thu Aug 1 16:33:39 2013 SujanUpdatePEMGuralp2 seismometer installed at North side of POX table1)Power to the seismometers were turned
down,
2)Guralp2 was moved to North side
 IMG_1213.JPG 
  8987   Thu Aug 8 18:43:12 2013 SujanSummaryPEMOptimally subtracting signals from two seismometers.An exercise of optimally subtracting one
seismometer signal by  another using weiner
filters was done. Results have been summarized
 Results.pdf 
  8988   Thu Aug 8 18:47:41 2013 SujanSummaryPEMUsing weiner filters for subtracting signals MC_L and GUR2_XI used MC_L signal from the Mode Cleaner
as the desired signal with  GUR2_X as witness
signals. I observed good subtraction where
 Results.zip 
  3725   Thu Oct 14 23:33:45 2010 SureshUpdateIOO2W NPRO laser output power versus temperatureSteve
measured an apparent power drop in the 2W
NPRO output from 2.1W to 1.6W(elog entry
 tempscan.pngScan2010.zip 
  3730   Fri Oct 15 21:25:23 2010 SureshUpdateIOO2W NPRO laser output power drop question  The power meter used in the measurements
of elog entries 2822, 3698 and 3709 was the
Ophir PD300-3W.  This power head has
  
  3798   Wed Oct 27 16:15:35 2010 SureshUpdateSUSRe-glued magnet to the PRMThanh and I re-glued the magnet to the
PRM following the procedure outlined by Jenne
The PRM in the gluing fixture has
  
  3800   Wed Oct 27 21:33:42 2010 SureshUpdateLockingGreen from the far end re-obtained 
The
mirror which was moved during the mode matching
  
  3801   Wed Oct 27 21:51:29 2010 SureshUpdatePSLAttenuation of PSL NPRO removedThe laser
power was attenuated to 40 mW yesterday for
ensuring that the power built up within the
  
  3804   Thu Oct 28 03:21:35 2010 SureshUpdateLockingAligned the MC2 transmission photodiodeYuta and
Suresh
  
  3843   Tue Nov 2 00:17:01 2010 SureshConfigurationLockingTemporary changes to the Video MuxFiber
coupling 1064 nm light at the end of X arm
This
  
  3859   Thu Nov 4 03:13:46 2010 SureshUpdateLockingFibre coupling 1064nm light at the south-end table[Kiwamu,
Suresh]
We
  
  3865   Thu Nov 4 19:00:57 2010 SureshUpdateLockingFibre coupling 1064nm light at the south-end tableThe Fluke
Visual Fault locator (Visifault) arrived
and I used it to couple 1064nm light into
  
  3866   Thu Nov 4 19:26:51 2010 SureshUpdateLockingChanges to the Video MUX reversedAll the
temporary changes to the video cables and
the video MUX ( 3843
  
  3882   Mon Nov 8 18:30:33 2010 SureshUpdateIOOMC Trans Mon QPD gain increased by 50xIncreased
the transimpedance gain of the MC-Trans-Mon
QPD ckt 
  
  3902   Fri Nov 12 00:13:34 2010 SureshUpdateSUSETM assembly started[Jenne,
Suresh]
Selection
  
  3928   Mon Nov 15 22:24:28 2010 SureshUpdateSUSSelection of MagnetsI have
selected a set of 16 magnets which have a
B field between 900 to 950 Gauss (5% variation)
  
  3953   Fri Nov 19 04:23:12 2010 SureshUpdateSUSCleaned and stuck magnets to dumbbellsTo clean
the glue off the magnets and dumbbells I soaked them
 7x 
  3958   Fri Nov 19 18:20:59 2010 SureshUpdateSUSGlue dynamics!I examined
the magnet-dumbbell joints under the microscope
to see whether the glue that I applied yesterday
 Too_much_glue_1.jpgToo_much_glue_2.jpgToo_much_glue_2.jpgToo_much_glue_3.jpg 
  3991   Mon Nov 29 22:50:07 2010 SureshUpdateSUSETMU05 Side Magnets glued back [Suresh, Jenne]
ETMU05
: Gluing Side magnets back on to the optic.
  
  4002   Wed Dec 1 02:39:00 2010 SureshUpdateSUSInstallation of ETMU07 as ETMX[Kiwamu, Jenne, Koji, Suresh]
The following steps in this process
were completed.
  
  4022   Tue Dec 7 18:37:15 2010 SureshUpdateSUSETMU05 ready for bakingThe ETMU05 has been removed
from the suspension and put into
the little foil house. 
  
  4092   Thu Dec 23 08:54:32 2010 SureshUpdateelogthe delhi univ syndromeSorry folks!  I couldnt get to the
elog and didnt know that the elog was crashing
every time I tried to access it. 
  
  4106   Tue Jan 4 15:12:33 2011 SureshUpdateIOOMC Trans Mon QPD gain decreased by 10 Decreased
the gain of MC-Trans-Mon QPD ckt
The
  
  4137   Tue Jan 11 17:08:43 2011 SureshConfigurationPSLreplaced the pzt-steering mirror on PSL[Rana,
Jenne, Suresh]
Yesterday,
  
  4143   Wed Jan 12 17:22:47 2011 SureshConfigurationLockingMC demod phase adjusted to minimise the I output[Koji, Suresh]
We wanted to check and make sure
that the relative phase of the two inputs
 TEK00000.PNG 
  4147   Wed Jan 12 22:39:16 2011 SureshUpdateIOOPut MC PZT offset onto MC board, instead of on awkward cart


   
        
            
 P1120508.JPGP1120509.JPGD040180-B_with_5V_offset.pdf 
  4161   Sun Jan 16 02:20:59 2011 SureshUpdateLockingcomparing the PSL with the X-end-NPRO through the green beatObjective:
      We
wish to study the coherence of the two NPROs
 P1160510.JPGP1160511.JPGP1160515.JPGP1160516.JPG 
  4166   Wed Jan 19 03:37:30 2011 SureshUpdateLockingcomparing the PSL with the X-end-NPRO through the green beat 
 
 [Kiwamu, Suresh]
 Phase_noise_in_digital_frequency_dividers.pdf 
  4187   Sat Jan 22 01:56:04 2011 SureshUpdateGreen LockingExamining the stability of VCO PLL at low frequencies[Kiwamu,
Suresh, Rana]
Our
 VCO_PLL_stability.pngVCO_PLL_stability.png 
  4225   Sat Jan 29 00:31:05 2011 SureshUpdateGeneralVertex crane upgrade completedThe
Vertex crane is smarter and safer now. 
 6x 
  4243   Thu Feb 3 04:43:58 2011 SureshUpdateElectronicsAdded two new DAQ channels[Suresh, Joe]
We added the following two new DAQ
channels into the c1:GCV model.  The
  
  4248   Fri Feb 4 11:10:27 2011 SureshUpdateGreen LockingVCO PLL Frequency noiseThis measurement pertains to the BL2002
VCO PLL unit.
 
 VCO_calibration.pngVCO_PLL_Servo.pngVCO_Gain.pngVCO_Transfer_Functions.pngVCO_PLL_Freq_Noise.png 
  4266   Wed Feb 9 23:48:12 2011 SureshConfigurationCamerasVideo Cable work: New Labels[Larisa, Aidan,Steve,Suresh]
   Today was the first
session for implementing the new video cabling
  
  4272   Fri Feb 11 00:20:58 2011 SureshUpdateElectronicsREFL11: Photodiode requires replacement 
This is with reference to Kevin and
Jenne's elogs  # 3890,
 REFL11_10Feb2011.jpg 
  4275   Sat Feb 12 08:08:05 2011 SureshUpdateElectronicsREFL11 Photodiode replacedA new photodiode ( Perkin and Elmer Model
no. C30642GH Sl No.1526) has been installed
in the place of the old photodiode. 
 C30642_datasheet-1.pdf40mUpgradeREFL11schematic.pdfP2120572.JPGP2120565.JPGP2120571.JPG 
  4279   Sun Feb 13 16:20:53 2011 SureshUpdateElectronicsREFL11 Photodiode replacedIt is 0.375 mW as in the calculation. 
The total diode output is just 1mW and it
is divided with a 50/50 beam splitter... 
  
  4284   Mon Feb 14 07:37:13 2011 SureshUpdateElectronicsRF Generation Box: capacitors across power lines 
There were several parts in this
box which did not have shunting capacitors
  
  4285   Mon Feb 14 07:58:43 2011 SureshUpdateCDSToday's CDS problems 
  I am concentrating on the
RF system just now and will be attending
  
  4296   Tue Feb 15 06:15:07 2011 SureshUpdateASCno signal from IP_ANG_Seg1[Valery, kiwamu, Jenne, Suresh]
    I first interchanged
the two QPD's on the Y end table to see if
 Y-end_beam.JPG 
ELOG V3.1.3-