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ID Date Author Typeup Category Subject Text Attachments
  409   Sun May 30 15:17:16 2021 KojiGeneralGeneralDCPD AF capacitance measirementAttachment 1: System diagram.
The reverse bias voltage is controlled by
DS335. This can produce a voltage offset
 PD_cap_meas.pdf20210529013015_IMG_0577.jpeg20210529013114_IMG_0580_2.jpeg20210529013200_IMG_0584.jpeg20210529013229_IMG_0586.jpeg 
  410   Sun May 30 15:32:56 2021 KojiGeneralGeneralDCPD AF capacitance measirementMeasurement result:

The capacitance at no bias was
460~500pF. This goes down to below 300pF
 highQEPD_capacitance.pdfC30665_capacitance.pdf 
  52   Sun Jan 6 23:22:21 2013 KojiMechanicsGeneralSolidWorks model of the OMC suspension    D0900295_AdvLIGO_SUS_Output_Mode_Cleaner_Overall_Assembly.pngD0900295_AdvLIGO_SUS_Output_Mode_Cleaner_Overall_Assembly.easm 
  58   Tue Jan 22 17:56:32 2013 KojiMechanicsGeneralRotary stage selectionNewport UTR80

    Sensitivity: 4 arcsec
  
  69   Thu Mar 7 15:53:47 2013 KojiMechanicsGeneralOMC Transportation fixture, OMC PD/QPD mounts   P3073218.JPGP3073219.JPGP3073223.JPGP3073225.JPGP3073227.JPG 
  70   Thu Mar 14 17:06:21 2013 KojiMechanicsGeneralOMC SUS work @LLOEDIT (ZK): All photos on
Picasa. Also, I discovered that
 2013-03-14_16.03.40.jpg2013-03-14_16.04.07.jpg 
  90   Mon Apr 1 10:28:03 2013 KojiMechanicsGeneralAdditional UV blast for the top surface[Koji, Lisa, Jeff, Zach]

Jeffs concern after talking with the
 P3283483.JPGP3283459.jpgP3283473.JPG 
  92   Wed Apr 3 17:39:38 2013 KojiMechanicsCharacterizationCalibration of the test PZTs before the glue testWe want to make sure the responses of the
PZT actuator does not change after the EP30-2
gluing.
 P4033491.JPGshadow_sensor_calib.pdf 
  98   Fri Apr 5 14:39:26 2013 KojiMechanicsCharacterizationCalibration of the test PZTs after the heat cureWe attached fused silica windows on the
test PZTs. http://nodus.ligo.caltech.edu:8080/OMC_Lab/93
The glued assemblies were brought
 shadow_sensor_calib_after_bake.pdfPZTresponse.pdf 
  102   Mon Apr 8 11:49:18 2013 KojiMechanicsCharacterizationPZT actuator tested at LLOTest result of the PZTs by Valera and Ryan
PZT  Length Angle
 #
  [nm/V] [urad/um]
 11  14.5   17.6
  
  124   Mon May 13 14:49:35 2013 KojiMechanicsCharacterizationMounting Glass Bracket still broke with tightenin stress[Koji / Jeff]
This is the elog about the work on
May 9th.
  
  125   Mon May 13 14:59:16 2013 KojiMechanicsGeneralInvar shim gluingThe invar reinforcement shims were glued
on the glass brackets on the breadboard.
  
  130   Thu May 23 23:41:48 2013 KojiMechanicsGeneralDCPD/QPD MountDCPD mounts and QPD mounts were attached
on the breadboard. They are not aligned yet
and loosely fastened.
  
  148   Sat Jul 6 17:10:07 2013 KojiMechanicsCharacterizationPZT Response analysisAnalysis of the PZT scan / TF data taken
on May 31st and Jun 1st.
[DC scan]
 PZT_Scan.pdfL1OMC_PZT_Response.pdf 
  158   Tue Aug 27 17:02:31 2013 KojiMechanicsCharacterizationSpot position measurement on the diode mountsAfter the PZT test, the curved mirrors
were aligned to the cavity again.
In order to check the height of the
 DCPD1.png 
  160   Thu Aug 29 18:55:36 2013 KojiMechanicsGeneralI1 OMC top side gluing (UV)The glass components for the I1 OMC top
side were glued by the UV glue.
Breadboard SN#4
  
  202   Tue Jul 8 18:54:54 2014 KojiMechanicsCharacterizationPZT characterizationEach PZT was swept with 0-150V 11Hz triangular
wave.
Time series data for 0.2sec was recorded
 PZT_Scan.pdfI1OMC_PZT_Response.pdf 
  210   Thu Jul 17 02:19:20 2014 KojiMechanicsCharacterizationI1OMC vibration testSummary
- The breadboard has a resonance
at 1.2kHz. The resonant freq may be chagned
 6x 
  211   Sun Jul 20 17:19:50 2014 KojiMechanicsCharacterizationI1OMC vibration test ~ 2nd roundImproved
vibration measurement of the OMC
Improvement
 9x 
  213   Mon Jul 21 01:02:43 2014 KojiMechanicsCharacterizationSome structual mode analysisPrisms
Fundamental: 12.3kHz Secondary: 16.9kHz
 6x 
  218   Tue Sep 9 20:59:19 2014 KojiMechanicsCharacterizationStructural mode analysis for the PZT mirrorStructural analysis of the PZT mirror with
COMSOL.
Inline figures: Eigenmodes
 6x 
  296   Wed May 30 16:40:38 2018 KojiMechanicsCharacterizationEOM mount stability testhttps://awiki.ligo-wa.caltech.edu/wiki/EOM_Mount_Stability   
  314   Fri Feb 1 12:52:12 2019 KojiMechanicsGeneralPZT deformation simulationA simple COMSOL simulation was run to see
how the PZT deforms as the voltage applied.

Use the geometry of the ring PZT
 pzt.png 
  320   Thu Mar 28 16:36:52 2019 KojiMechanicsCharacterizationOMC(002) PZT characterization As
performed in the ELOG 202, the PZTs of
the OMC 002 were tested.
 PZT_Scan.pdfOMC_PZT_Response.pdf 
  328   Thu Apr 11 12:15:31 2019 KojiMechanicsConfigurationPZT sub assy mirror orientations   PZT_subassy.pngPZT_subassy.pdf 
  329   Thu Apr 11 21:22:26 2019 KojiMechanicsGeneralOMC(004): PZT sub-assembly gluing[Koji Stephen]

The four PZT sub-assemblies were
glued in the gluing fixtures. There were
 IMG_7561.jpgIMG_7567.jpg 
  358   Thu May 9 16:07:18 2019 StephenMechanicsGeneralImprovements to OMC Bonding Fixture[Stephen, Koji]

As mentioned in eLOG
331, either increased thermal cycling
 image_of_issue_with_OMC_PZT_bonding_fixture_from_D16003336-v3.pngimage_02_of_issue_with_OMC_PZT_bonding_fixture_from_D16003336-v3.PNG 
  400   Mon Nov 9 22:06:18 2020 KojiMechanicsGeneral5th OMC Transport FixtureI helped to complete the 5th OMC Transport
Fixture. It was built at the 40m clean room
and brought to the OMC lab. The fixture hardware
 IMG_0211.jpgIMG_0221.jpg 
  4   Wed Jun 20 20:37:45 2012 ZachOpticsConfigurationTopology / parameter selectionEDIT (ZK): All the plots here were generated  8x 
  5   Thu Jun 21 03:07:27 2012 ZachOpticsConfigurationParameter selection / mode definitionEDIT 2 (ZK): As with the   geom_bowtie.pnggeom_non-bowtie.png 
  6   Fri Jun 29 11:26:04 2012 ZachOpticsCharacterizationRoC measurement setupHere is the proposed RoC measurement
setup. Koji tells me that this is referred
to as "Anderson's method".
 RoC_measurement_setup.pngRoC_measurement_setup.graffle.zip 
  8   Wed Jul 18 23:20:13 2012 KojiOpticsCharacterizationMode scan results of ELIGONic Smith sent me a bunch of elog lists
where the results of the mode scan can be
found.
  
  9   Sun Jul 22 15:56:53 2012 ZachOpticsCharacterizationRoC measurement setupHere is a more detailed version of
the setup, so that we can gather the parts
we will need.
 detailed_RoC_setup.pngdetailed_RoC_setup.graffle.zip 
  22   Fri Oct 5 03:39:58 2012 KojiOpticsGeneralRoC Test setupBased on Zach's experiment design, I wrote
up a bit more detailed optical layout for
the mirror test.
 RoC_test_setup.pdfRoC_test_setup.png 
  23   Mon Oct 8 11:30:47 2012 KojiOpticsGeneralEG&G 2mm photodiode angle responseEGE&G 2mm photodiode angle response
measured by Sam T1100564-v1
  
  24   Tue Oct 9 04:59:24 2012 KojiOpticsGeneralOMC Test Optical Setup   OMC_test_setup.pngOMC_test_setup.pdf 
  26   Fri Oct 12 17:15:19 2012 KojiOpticsGeneralLoan from the 40m / ATF
    HWP set
         
    
  
  30   Wed Oct 17 20:36:04 2012 KojiOpticsGeneralRoC test cavity lockedThe RoC test setup has been built on
the optical table at ATF.
 detailed_RoC_setup.pdfomc_cav_lock_SCRN_SHOT.pngCav_scan_response_20121016.pdf 
  31   Thu Oct 18 20:23:33 2012 KojiOpticsCharacterizationImproved measurementSignificant
improvement has been achieved in the RoC
 Cav_scan_response_zoom_20121017.pdfdetailed_RoC_setup.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 
  35   Thu Nov 8 13:24:53 2012 KojiOpticsCharacterizationMore wedge measurementA1
Horiz Wedge    0.497   
+/-    0.004 deg
 wedge_measurement_overall.pdf 
  37   Thu Nov 8 19:52:57 2012 KojiOpticsGeneralHow to apply UV epoxyKA's question:
Do
 UVepoxy.jpg 
  38   Thu Nov 8 20:12:10 2012 KojiOpticsConfigurationHow many glass components we need for a plateOptical prisms 50pcs (A14+B12+C6+E18)
Curved Mirrors 25pcs (C13+D12)
  
  39   Fri Nov 9 00:43:32 2012 KojiOpticsCharacterizationFurther more wedge measurementNow it's enough for the first OMC (or even
second one too).
Today's measurements all distributed
 wedge_measurement_overall.pdf121108a_A1.pdf 
  40   Sat Nov 17 02:31:34 2012 KojiOpticsCharacterizationMirror T testMirror T test
The mirror was misaligned to have
~2deg incident (mistakenly...) angle.
  
  41   Mon Nov 19 13:33:14 2012 KojiOpticsCharacterizationResuming testing mirror RoCsIn order to resume testing the curvatures
of the mirrors, the same mirror as the previous
one was tested.
 Cav_scan_response_zoom_20121016.pdf 
  42   Mon Nov 26 01:40:00 2012 KojiOpticsCharacterizationMore RoC measurementC1: RoC: 2.57845 +/− 4.2e−05m
 RoC_measurement.pdf 
  43   Thu Nov 29 21:18:23 2012 KojiOpticsGeneralOMC Mounting Prisms have come   PB293030.JPGPB293032.JPG 
  44   Tue Dec 18 20:04:40 2012 KojiOpticsCharacterizationPrism Thickness MeasurementThe thicknesses of the prism mirrors (A1-A5)
were measured with micrometer thickness gauge.
Since the thickness of the thinner
 prism.png 
  48   Mon Dec 31 03:10:09 2012 KojiOpticsGeneralSolidWorks model of the OMC breadboard   D1201439_aLIGO_Breadboard_layout_assy_121224.pngD1201439_aLIGO_Breadboard_layout_assy_130105.easm 
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