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ID Date Author Type Category Subjectdown Text Attachments
  362   Thu May 16 12:41:28 2019 ChubGeneralGeneralfire pillow found on optics tableThat is an expanding fire pillow, also
known as firebrick.  It is used to create
a fire block where holes in fire-rated walls
  
  107   Wed Apr 10 00:40:30 2013 ZachOpticsConfigurationfauxMC locked[Koji, Zach]
 fauxMC_labeled.jpg 
  67   Tue Mar 5 19:37:00 2013 ZachOpticsCharacterizationeLIGO OMC visibility vs. power measurement detailsEDIT (ZK): Koji points out that (1 -
Ti) should really be the non-resonant reflectivity
of the aligned cavity, which is much closer
 eOMC_visibility_3_4_13.png 
  68   Wed Mar 6 23:24:58 2013 ZachOpticsCharacterizationeLIGO OMC visibility vs. power measurement detailsI found that, in fact, I had lowered
the modulation depth since when I measured
it to be 0.45 rads --> Psb = 0.1.
 TEK00005.PNGTEK00007.PNGeOMC_visibility_3_4_13.pngeOMC_AMTF_vs_power_3_6_13.png 
  291   Thu Feb 22 20:21:02 2018 KojiOpticsCharacterizationaLIGO EOM testPOSTED
to 40m ELOG
  
  292   Mon Apr 2 17:27:04 2018 KojiOpticsCharacterizationaLIGO EOM test2nd optical test http://nodus.ligo.caltech.edu:8080/40m/13725   
  153   Fri Aug 16 17:21:38 2013 KojiGeneralGeneral[OMC002] Build started[Jeff Koji]

The breadboard (SN2) was loaded
on the transportation fixture.
  
  74   Wed Mar 20 09:38:02 2013 ZachOpticsCharacterization[LLO] OMC test bench modified For various reasons, I had to switch
NPROs (from the LightWave 126 to the Innolight
Prometheus).
 new_setup_traced.jpg 
  146   Tue Jun 18 15:45:38 2013 KojiGeneralGeneral[LLO] OMC installation in HAM6OMC installed
in HAM6!
  
  140   Fri Jun 7 16:04:44 2013 KojiGeneralGeneral[LLO] OMC arrived[Koji Zach Suresh]
The OMC arrived at LLO without any
destruction!
  
  143   Thu Jun 13 12:12:20 2013 ZachGeneralGeneral[LLO] OMC and OMCS in LVEAhttps://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=7395
  
  141   Mon Jun 10 10:04:37 2013 KojiGeneralGeneral[LLO] OMC Test[Koji Zach]
We worked on the OMC test over
the weekend.
 OMC_pow_cal.pdfresponsivity.pdfOMC_pow_cal_compensated.pdf 
  142   Thu Jun 13 12:04:57 2013 KojiGeneralGeneral[LLO] OMC Optical Test - completedhttps://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=7373   
  144   Fri Jun 14 06:35:21 2013 JeffGeneralGeneral[LLO] L1 OMC statushttps://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=7410
Weights:
Suspension cage and transportation
 preamp_arrangement.png 
  19   Wed Aug 22 20:16:43 2012 KojiFacilityGeneralWorkbenches have been installed / Clean room stoolsLast Friday, new workbenches were installed.
Vladimir got a new table and a cleanroom
stool.
 P8171968.jpgP8171969.jpg 
  300   Mon Jul 2 15:27:31 2018 Rich AbbottElectronicsGeneralWork on EOM (3rd IFO unit)Koji, Rich

We took apart the unit removed
from the 3rd IFO (Unit serial number aLIGO
 EOM3_aLIGO_3rdIfo.JPG 
  33   Wed Nov 7 20:21:42 2012 KojiGeneralGeneralWork completed in October [!]Completed work of the previous months:
[Jul]
[Aug]
  
  47   Mon Dec 31 01:45:04 2012 KojiGeneralGeneralWork completed in Nov and Dec [!]Completed work of the previous months:
[Jul]
[Aug]
  
  12   Tue Jul 31 21:29:43 2012 KojiGeneralGeneralWork completed in July [!]
    Completed Work: Facility/Supplies

   
        
  
  28   Tue Oct 16 15:50:09 2012 KojiGeneralGeneralWork completed in August/September [!]
    Work done
   

        
  
  361   Wed May 15 19:07:53 2019 KojiCleanGeneralWhat is this???Suddenly something dirty emerged in the
lab. What is this? It looks like an insulation
foam or similar, but is quite degraded and
 P_20190515_185602.jpgP_20190515_185844.jpg 
  371   Thu Aug 22 12:35:53 2019 StephenOpticsCharacterizationWedging of the debonded PZTs 2019 AugustWedge and thickness measurements of PZTs
12 and 13 took place after debonding and
cleaning - results are shown in the first
 IMG_4775.JPGIMG_4770.JPG 
  373   Thu Aug 29 11:51:49 2019 shrutiOpticsCharacterizationWedging of the debonded PZTs - CalculationUsing the measurements of PZTs 12,13 taken
by Stephen, I estimated the wedging angle
and orientation following Section 2.3.1 of
 PZT_Wedging_Results.pdfPZT_Wedging_Calc.pdf 
  53   Thu Jan 10 18:37:50 2013 KojiOpticsCharacterizationWedging of the PZTsYesterday I measured the thickness of the
PZTs in order to get an idea how much the
PZTs are wedged.
 PZT_wedging.pdf 
  59   Mon Feb 4 00:39:08 2013 KojiOpticsCharacterizationWedge measurement with the autocollimator and the rotation stageMethod:

    Mount the tombstone prism
on the prism mount. The mount is fixed on
 autocollimator_wedge_measurement.pdf 
  60   Wed Feb 6 02:34:10 2013 KojiOpticsCharacterizationWedge measurement with the autocollimator and the rotation stageMeasurement:

    A6:   α
= 0.665 deg, β = +3.0 arcmin (1.5 div
  
  66   Fri Mar 1 23:52:18 2013 KojiOpticsCharacterizationWedge measurement with the autocollimator and the rotation stageMeasurement:

    E1:   α = 
0.672 deg, β = +0.0  arcmin (0 div up)
  
  56   Sat Jan 19 20:47:41 2013 KojiOpticsCharacterizationWedge measurement with the autocollimatorThe wedge angle of the prism "A1"
was measured with the autocollimator (AC).
The range of the AC is 40 arcmin.
 autocollimator_wedge_measurement.pdf 
  32   Wed Nov 7 01:28:20 2012 KojiOpticsCharacterizationWedge angle test (A1)Wedge
angle test
Result: Wedge angle of Prism A1:
 wedge_measurement.pngwedge_measurement_setup.png 
  11   Tue Jul 24 11:41:29 2012 KojiGeneralGeneralUseful referencesNicolas Smith,
LIGO Document T0900383-v1
  
  239   Sun Sep 6 16:50:51 2015 KojiElectronicsGeneralUnit test of the EOM/AOM Driver S1500118TEST
Result: S1500118

Additional
 P9037810.JPGRF_AM_spectra.pdf 
  89   Mon Apr 1 03:23:48 2013 KojiOpticsGeneralUV power calibration[Koji Lisa Jeff Zach]
Eric G bought a UV power meter from
American Ultraviolet.
  
  62   Thu Feb 7 23:01:45 2013 KojiOpticsCharacterizationUV epoxy gluing test [Jeff, Yuta, Koji]
Gluing test with UV-cure epoxy
Optocast 3553-LV-UTF-HM
  
  265   Mon Aug 22 12:58:16 2016 KojiGeneralGeneralUV bond samples -> Garilynn- FS base + Mounting Prism

- FS or SF2 1/2" piece + FS
or SF2 1/2" piece
  
  134   Fri May 31 14:07:54 2013 KojiOpticsCharacterizationTransverse Mode Spacing measurement afte the baking Measurement for pitch
Free Spectral Range
(FSR): 264.9703 +/− 0.0007 MHz
 Cav_scan_response_130530_Pitch.pdfCav_scan_response_130530_Yaw.pdf 
  278   Fri May 26 21:53:20 2017 KojiGeneralConfigurationTrans RF PD setupRecent work

- DC output of the trans RF PD
was connected to the BNC patch panel. =>
  
  279   Tue Jun 6 00:49:48 2017 KojiGeneralConfigurationTrans RF PD setupLast week, I further worked on the RF system
to install 20dB coupler on the agilent unit
and setup the R channel. This allowed me
  
  280   Tue Jun 6 22:00:36 2017 KojiGeneralConfigurationTrans RF PD setup- Replaced the PZT with the one used from
the beginning. This must be PZT #21. After
the replacement, the spot positions look
  
  4   Wed Jun 20 20:37:45 2012 ZachOpticsConfigurationTopology / parameter selectionEDIT (ZK): All the plots here were generated  8x 
  2   Sat Jun 16 08:53:09 2012 KojiGeneralGeneralTo Do ListFacility

    Work
    
  
  200   Mon Jul 7 01:36:03 2014 KojiGeneralGeneralTo DoOptical tests

    Cleaning

   Power Budget
  
  204   Thu Jul 10 08:34:57 2014 KojiGeneralGeneralTo DoOptical tests

    Cleaning

   Power Budget
  
  177   Tue Dec 10 16:41:51 2013 KojiGeneralGeneralTo BuyMasks / Wipes => done   
  50   Wed Jan 2 07:35:55 2013 KojiOpticsCharacterizationThickness of a curved mirrorMeasured the thickness of a curved mirror:
Took three points separated by 120
degree.
  
  404   Mon Nov 23 23:17:19 2020 KojiElectronicsCharacterizationThe dark noise of the Q3000 QPDsThe dark noise levels of the four Q3000
QPDs were measured with FEMTO DLPCA200 low
noise transimpedance amp.
 Q3000_dark_noise_81.pdfQ3000_dark_noise_82.pdfQ3000_dark_noise_83.pdfQ3000_dark_noise_84.pdf 
  405   Tue Nov 24 10:45:07 2020 gautamElectronicsCharacterizationThe dark noise of the Q3000 QPDsI see that these measurements are done
out to 100 kHz - I guess there is no reason
to suspect anything at 55 MHz which is where
  
  406   Tue Nov 24 12:27:18 2020 KojiElectronicsCharacterizationThe dark noise of the Q3000 QPDsThe amplifier BW was 400kHz at the gain
of 1e7 V/A. And the max BW is 500kHz even
at a lower gain. I have to setup something
  
  285   Wed Jul 5 16:59:44 2017 KojiGeneralGeneralThe OMC #002 was packed[Stephen Koji]

The OMC #002 was packed for the
transportation to Downs.
 DSC_0360.JPG 
  212   Sun Jul 20 17:20:39 2014 KojiGeneralGeneralThe 3rd (LIO) OMC was shipped out to LHO The 3rd (LIO) OMC was shipped out to LHO
on Friday (Jul 18) Morning.
At LHO
  
  86   Thu Mar 28 03:37:07 2013 ZachOpticsConfigurationTest setup input optics progress[Lisa, Zach]
Last night (Tuesday), I finished
setting up and aligning most of the input
 OMC_test_setup_IO.jpg2013-03-27_05.48.20.jpg2013-03-28_02.29.36.jpg 
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