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New entries since:Wed Dec 31 16:00:00 1969
ID Date Author Type Category Subjectup Text Attachments
  242   Wed Sep 9 01:58:34 2015 KojiOpticsCharacterizationPBS Transmission measurementCalcite Brewster PBS Continued

The
transmission loss of the Calcite brewster
  
  172   Wed Oct 16 19:16:29 2013 KojiOpticsCharacterizationPD alignment 
 shim 1.5mm 001/002
  
  449   Tue Sep 20 08:54:33 2022 KojiGeneralGeneralPD cage arrangementUpon the LLO work, the current PD arrangement
in the cages are:
CAGE B
  
  252   Sun Mar 6 02:13:28 2016 KojiOpticsCharacterizationPD glass reflectionsOn friday, I removed a glass cover of a
G30655 with a PD can cutter.

When a beam shoots a Perkin Elmer/Excelitas
 P3048124.JPGP3048125.JPG 
  174   Wed Oct 23 02:45:07 2013 KojiGeneralGeneralPD realignmentDCPD2 got misaligned during the cable installation.
The PD alignment procedure have been gone
through again.
  
  111   Tue Apr 16 00:40:45 2013 KojiOpticsGeneralPD/QPD path gluing ~ preparation[Jeff Koji]
- Placed the optics on the PD/QPD
path
  
  276   Tue Mar 28 21:04:27 2017 KojiElectronicsCharacterizationPDH ampAttachment 1: PDH amp
RF part (before the preamp was installed)

Attachment 2:
 6x 
  286   Sat Jul 29 18:44:38 2017 ranaElectronicsCharacterizationPDH ampattachment 6: DCPD preamp looks like the
opamp is wired for positive feedback?
  
  287   Sat Jul 29 21:42:51 2017 KojiElectronicsCharacterizationPDH ampThe polarities indicated in the right circuits
were opposite, obviously.
  
  313   Sat Jan 12 22:49:11 2019 KojiOpticsCharacterizationPM-SM patch cable mode cleaning effectMode
cleaning capability of an optical fiber was
measured. The conclusion
 fiber_mode_cleaning.pdf 
  103   Mon Apr 8 20:56:52 2013 KojiOpticsConfigurationPZT & Curverd Mirror arrangementAssembly #1:
Mounting Prism #16
PZT #26
 PZT_assembly.pdf 
  149   Fri Aug 9 10:09:56 2013 KojiGeneralGeneralPZT Assembly #3/#4Yesterday, Jeff and I bonded the PZT assemblies
(#3/#4).
The attached is the arrangement of
 PZT_assembly.pdf 
  150   Mon Aug 12 20:22:19 2013 KojiGeneralGeneralPZT Assembly #5/#6PZT Assembly #5/#6 were glued on Fri Aug
9th
They are removed from the fixture
  
  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 
  374   Thu Sep 5 15:40:42 2019 shrutiOpticsConfigurationPZT Sub-AssemblyAim: To find the combinations
of mounting prism+PZT+curved mirror to build
two PZT sub-assemblies that best minimises
 Diagrams_SubAssembly.pdfC10_C13_Combinations.pdfPlots_Config_Tolerance.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
  
  104   Mon Apr 8 21:11:14 2013 KojiOpticsGeneralPZT assembly gluing[Jeff, Zach, Koji] 
PZT assembly gluing
Glue gun -> to be returned to
  
  106   Tue Apr 9 13:56:09 2013 KojiOpticsGeneralPZT assembly post gluing / pre baking pictures 
  
  77   Sat Mar 23 13:34:14 2013 KojiOpticsGeneralPZT assembly prototype glued 
Prototype
PZT assembly
 P3223322.jpgP3223323.jpgP3233336.jpgP3233348.jpg 
  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 
  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 
  156   Thu Aug 22 15:40:15 2013 KojiElectronicsConfigurationPZT endurance test[Koji, Jeff]
Background
In response to the failure of one
 P8214340.jpgP8214337.jpgIR_0457.jpgIR_0461.jpg 
  157   Fri Aug 23 19:24:32 2013 KojiElectronicsConfigurationPZT endurance test (II)The
PZT tests were finished with the conclusion
that the PZT won't be damaged with our expected
 PZT_shaking.png 
  328   Thu Apr 11 12:15:31 2019 KojiMechanicsConfigurationPZT sub assy mirror orientations   PZT_subassy.pngPZT_subassy.pdf 
  312   Thu Jan 10 20:45:00 2019 KojiOpticsCharacterizationPZT test cableAs OMC SN002 already has the PZTs connected
to the Mighty-Mouse connector, a test cable
with a female mighty-mouse connector was
 OMC_PZT_wiring.pdf 
  203   Thu Jul 10 01:39:38 2014 KojiElectronicsGeneralPZT wireRich came to the OMC lab. Pins for the
mighty mouse connector were crimped on the
4 PZT wires.
 P7096669.JPG 
  5   Thu Jun 21 03:07:27 2012 ZachOpticsConfigurationParameter selection / mode definitionEDIT 2 (ZK): As with the   geom_bowtie.pnggeom_non-bowtie.png 
  17   Mon Aug 13 17:01:35 2012 KojiCleanGeneralParticle CountsAug 13, 2012 / 0.5um 1000~2000/(0.1 cu
ft) / 0.7um   400-600/(0.1 cu ft)
by ATF particle counter (MET ONE 227A)
  
  20   Tue Sep 25 14:18:14 2012 KojiCleanGeneralParticle CountsParticle counts
Before the prefilter is installed:
0.5um 1191cnts, 0.7um 346cnts
  
  21   Mon Oct 1 16:06:55 2012 KojiCleanGeneralParticle Counts1. It turned out that the particle
counter MET ONE 227A at ATF shows 
(particle count)/(0.1 ft^3) 
  
  398   Fri Oct 23 19:09:54 2020 KojiGeneralGeneralParticle counter transfered to RadhikaSee this entry: https://nodus.ligo.caltech.edu:8081/40m/15642   
  63   Thu Feb 21 18:44:18 2013 KojiOpticsConfigurationPerpendicularity testPerpendicularity test of the mounting
prisms:
The perpendicularity of the prism
 perpendicularity_test.pdfP2203206.JPG 
  246   Tue Dec 15 13:39:13 2015 KojiElectronicsCharacterizationPhase noise measurement of aLIGO EOM driversThis measurement has been done on Dec 1st,
2015.


The phase noise added by
 phase_noise.pdfphase_noise_9MHz.pdf 
  13   Tue Jul 31 21:33:17 2012 KojiGeneralGeneralPlan Update: August [!]Completed work of the previous months:
[Jul]
[Aug] [Sep] [Oct] [Nov] [Dec]
  
  7   Sat Jul 14 02:16:07 2012 KojiGeneralGeneralPlan Update: JulyFacility/Supplies

    Work in progress
 P7071878.jpg 
  34   Wed Nov 7 20:44:11 2012 KojiGeneralGeneralPlan Update: November [!]Completed work of the previous months:
[Jul]
[Aug]
 OMC_Project_Schedule.pdf 
  29   Tue Oct 16 15:51:01 2012 KojiGeneralGeneralPlan Update: October [!]Completed work of the previous months:
[Jul]
[Aug]
  
  136   Mon Jun 3 21:19:03 2013 KojiGeneralGeneralPlanningMonday - Evening
(Koji)
[done] - DCPD alignment
  
  395   Thu Oct 8 19:55:22 2020 KojiGeneralCharacterizationPower Measurement of Mephisto 800NE 1166AThe output of Mephisto 800NE (former TNI
laser) was measured.
The output power was measured with
 Mephisto800NE_1166A.pdf 
  227   Wed Jul 22 09:43:01 2015 KojiElectronicsAM Stabilized EOM DriverPower supply test of the EOM/AOM DriverSerial Number of the unit: S1500117
Tester: Koji Arai
  
  399   Fri Nov 6 18:38:00 2020 KojiGeneralGeneralPowermeter lent from OMC Lab to 2um ECDLThorlabs' powermeter controler +
S401C head was lent from OMC Lab. Returned
to OMC Jul 15, 2022 KA
  
  290   Thu Nov 30 12:18:41 2017 StephenGeneralGeneralPreparation for Modal Testing on 4 DecemberNorna Robertson, Stephen Appert || 
29 Nov 2017, 2 pm to 4 pm  || 
227 Downs, CIT
  
  288   Fri Sep 8 15:14:05 2017 KojiFacilityGeneralPreparation for the plumbing work[Steve, Aaron, Koji]

We've finished the preparation
for the forthcoming plumbing work on (nominally)
 7x 
  264   Mon Aug 15 10:09:10 2016 KojiGeneralGeneralPrev H1 OMC shipped to CITPrevious H1 OMC shipped from LHO to CIT

https://ics-redux.ligo-la.caltech.edu/JIRA/browse/Shipment-8196
  
  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 
  274   Thu Jan 19 20:57:53 2017 KojiSupplyGeneralPurchaseOrdered:

Office Depot
v AA battery Qty. 24
  
  275   Thu Feb 16 17:23:12 2017 KojiSupplyGeneralPurchase
BNC Patch Panel

8x
Amphenol Connex 112443 / Isolated BNC FEMALE
TO FEMALE BULKHEAD ISOLATED ADAPTER - 50
  
  321   Thu Apr 4 20:07:39 2019 KojiSupplyGeneralPurchase== Office Depot ==
Really
Useful Box 9L x 6 (delivered)
  
  258   Tue Apr 5 18:14:55 2016 KojiGeneralLoan / LendingQPD Lending CrackleXiaoyue

QPD head
X-Z stage
  
  132   Thu May 30 15:00:28 2013 KojiOpticsGeneralQPD alignmentThe QPD alignment was adjusted using
the aligned beam to the cavity and the 4ch
transimpedance amplifier.
  
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