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IDdown Date Author Type Category Subject Text Attachments
  411   Wed Jul 7 14:21:50 2021 StephenSupplyGeneralOMC Unit 4 Build Machined PartsMore explicit insights into the inventory
for the Unit 4 build. Image of inventory
included below.
 IMG_9238.JPGIMG_9236.JPG 
  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 
  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 
  408   Thu May 20 17:03:50 2021 KojiGeneralGeneralSRS LCR meter SRS720 borrowed from DownsItem loan: SRS LCR meter SRS720 borrowed
from Downs. The unit is at the 40m right
now for testing with an excelitas PD. Once
 P_20210520_154841.jpg 
  407   Fri Feb 5 07:40:37 2021 StephenSupplyGeneralOMC Unit 4 Build Machined PartsOMC Unit 4 Build Machined Parts are currently
located in Stephen's office. See image
of large blue box from office, below.
 IMG_8117.JPG 
  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
  
  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
  
  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 
  403   Sun Nov 22 13:49:12 2020 KojiElectronicsCharacterizationImpedance Measurement for InGaAs QPDsTo know any anomaly to the junction
capacitance of the QPD segments, the RF impedances
were tested with a hand-made impedance measurement.
 impedance_measurement.pdfP_20201121_183830.jpgimpedance_test.pdfQ3000_impedance_test.pdf 
  402   Sat Nov 21 13:58:30 2020 KojiElectronicsCharacterizationDark Current Measurement for InGaAs QPDsDark current measurement for InGaAs QPDs
(OSI FCI-InGaAs-Q3000) has been done using
Keithley 2450 and Frank's diode test
 Q3000_dark_current.pdf 
  401   Fri Nov 20 18:51:23 2020 KojiGeneralGeneralInstrument loanFEMTO DLPCA200 low noise preamp (brand
new)

Keithley Source Meter 2450 (brand
  
  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 
  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.

https://nodus.ligo.caltech.edu:8081/SUS_Lab/1856
  
  398   Fri Oct 23 19:09:54 2020 KojiGeneralGeneralParticle counter transfered to RadhikaSee this entry: https://nodus.ligo.caltech.edu:8081/40m/15642   
  397   Fri Oct 16 00:53:29 2020 KojiGeneralGeneralTFT Monitor mountingThe image flipping of the display unit
was fixed. The vendor told me how to fix
it.
  
  396   Fri Oct 9 01:01:01 2020 KojiGeneralGeneralTFT Monitor mountingTo spare some room on the optical table,
I wanted to mount the two TFT monitor units
on the HEPA enclosure frame.
 20201008214515_IMG_0152.jpg20201008214519_IMG_0153.jpg20201008214536_IMG_0154.jpg20201008220955_IMG_0155.jpg20201008221019_IMG_0156_2.jpg 
  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 
  394   Mon Sep 28 16:13:08 2020 KojiGeneralGeneralOMC Beam Dump Production Cure BakeAccording to the past backscatter test
of the OMC (and the black glass beamdump:
not V type but triangular type on a hexagonal-mount),
  
  393   Mon Sep 28 16:03:13 2020 ranaGeneralGeneralOMC Beam Dump Production Cure Bake
are there any measurements of the BRDF
of these things? I'm curious how much
light is backscattered into the incoming
  
  392   Mon Aug 10 15:53:46 2020 KojiGeneralGeneralLab status checkCheck-in to the OMC lab to see the status.
Nothing seemed changed. No bug. The HEPA
is running normal. The particle level was
  
  391   Mon Aug 10 15:34:04 2020 KojiFacilityLoan / LendingGlue bake ovenBlack and Decker Glue Baking Oven came
back to the OMC lab on Aug 10, 2020, Georgia
had lent the unit for the SAMS assembly/testing.
  
  390   Mon Aug 10 15:29:54 2020 KojiGeneralGeneralItem lendingThe particle counter came back to the OMC
lab on Aug 10, 2020

 
  
  389   Thu Feb 27 14:31:13 2020 KojiGeneralGeneralItem lendingItem lending as per Ian's request:
Particle Counter from OMC Lab to QIL

 
 P_20200227_134755_vHDR_On.jpg 
  388   Wed Dec 18 21:54:53 2019 KojiGeneralGeneralOMC Beam Dump Production Cure BakeThe beamdumps were taken out from the oven
and packed in bags.

The bottom of the V are completely
 P_20191218_160650_vHDR_On.jpegP_20191218_160705_vHDR_On.jpegP_20191218_160733_003.jpeg 
  387   Fri Dec 13 14:59:18 2019 StephenGeneralGeneralOMC Beam Dump Production Cure Bake[Koji, Jordan, Stephen]

The beam dumps, bonded on Fri 06
Dec 2019, were placed in the newly tuned
 IMG_6080.JPGIMG_6079.JPG 
  386   Fri Dec 6 00:55:25 2019 KojiOpticsGeneralBeamdump gluing[Stephen, Koji]

20 glass beamdumps were
bonded at the 40m cleanroom.
 6x 
  385   Tue Oct 22 15:54:59 2019 KojiElectronicsLoan / LendingBorrowed LB1005 from Cryo CavFrom Cryo Cav setup

Borrowed LB1005 Servo box ->
OMC
  
  384   Tue Oct 22 11:56:09 2019 StephenSupplyGeneralEpoxy Status update as of 22 October 2019The following is the current status of
the epoxies used in assembly of the OMC (excerpt
from C1900052)
 image_ep30-2_epoxy_kit_pcs_item_1582_location_downs_3303.JPG 
  383   Tue Oct 22 11:52:53 2019 StephenGeneralGeneralEpoxy Curing Timeline of OMC PZT Assy #9 and #10This post captures the curing timeline
followed by OMC PZT Assys #9 and #10.

Source file posted in case any
 omc_elog_383_Epoxy_Curing_Timeline_of_OMC_PZT_Assy_20191022.pngomc_elog_383_Epoxy_Curing_Timeline_of_OMC_PZT_Assy.pptx 
  382   Tue Oct 22 10:25:01 2019 StephenGeneralGeneralOMC PZT Assy #9 and #10 Production Cure Bake OMC PZT Assy Production Cure Bake (ref.
OMC
elog 381) for PZT Assy #9 and #10 started
 OMC_ABO_PZT_Curing_Bake_effort_201906_thru_201909.xlsproduction_cure_bake_pzt_assys_9_and_10_20190927.png 
  381   Mon Sep 30 23:16:53 2019 KojiOpticsGeneralOMC(004): PZT sub-assembly gluing (#9/#10)Friday: [Stephen, Koji]

As the oven setting has qualified,
we brought the PZT assys in the air bake
 IMG_8950.jpegIMG_8953.jpegIMG_8954.jpegIMG_8955.jpeg 
  380   Thu Sep 26 17:33:52 2019 StephenGeneralGeneralDirty ABO test run prior to PZT Subassembly Bonding - ABO is Ready!Follow up on OMC
elog 379

I was able to obtain the following
 image_showing_20190924_abo_qualifying_bake.png 
  379   Tue Sep 24 12:19:20 2019 StephenGeneralGeneral Dirty ABO test run prior to PZT Subassembly Bonding The 40m Bake Lab's
Dirty ABO's OMEGA PID controller was
borrowed for another oven in the Bake Lab
 image_showing_20190923_abo_qualifying_bake.png 
  378   Mon Sep 23 21:29:51 2019 KojiOpticsGeneralOMC(004): PZT sub-assembly gluing (#9/#10)[Stephen, Shruti, Koji]

We worked on the gluing of the
PZT sub-assy (#9 and #10) along with the
 IMG_8933.jpgIMG_8934.jpg 
  377   Wed Sep 18 23:38:52 2019 StephenGeneralGeneralDirty ABO ready for PZT Subassembly BondingThe 40m Bake Lab's
Dirty ABO's OMEGA PID controller was
borrowed for another oven in the Bake Lab,
 index.png 
  376   Wed Sep 18 23:16:06 2019 StephenSupplyGeneralItems staged at 40m Bake Lab for PZT Subassembly BondingThe following items are presently staged
at the 40m Bake Lab (see photo indicating
current location) (noting items broght by
 IMG_5216.JPGIMG_5215.JPG 
  375   Wed Sep 18 22:30:11 2019 StephenSupplyGeneralEP30-2 Location and StatusHere is a summary of the events of the
last week, as they relate to EP30-2.

1) I lost the EP30-2 syringes that
 IMG_5217.JPG 
  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 
  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 
  372   Fri Aug 23 11:11:44 2019 shrutiOpticsCharacterizationFinding the curvature bottomI attempted to fit the data taken
by Koji of the beam spot precession at the
CCD in order to find the location of the
 CircleFit.pdfSineFit.pdf 
  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 
  370   Mon Jul 1 12:49:42 2019 KojiOpticsCharacterizationScattering measurement of A and C mirrorsLiyuan's scattering measurement for
the A and C mirrors.
 omc_cm_tis_062419.pdfomc_prism_tis_062419.pdf 
  369   Mon Jul 1 12:38:49 2019 KojiOpticsCharacterizationA and M prisms perpendicularity measurement[Stephen, Koji]

The perpendicularity of
some of the A and M prisms were tested.
 6x 
  368   Mon Jun 24 12:54:58 2019 KojiCleanGeneralHEPA BOOTHhttps://www.airscience.com/purair-flow-laminar-flow-cabinets   
  367   Tue May 28 12:14:20 2019 StephenOpticsGeneralCM PZT Assembly Debonding of EP30-2 in Acetone[LiyuanZ, StephenA]

Downs B119

Summary:
 8x 
  366   Thu May 23 23:27:38 2019 KojiOpticsCharacterizationIGHQEX3000 high power testLaserComponents IGHQEX3000 (Cage
B2: Serial# B1-23) was exposed to the beam
with the optical power from 1.6mW to 332mW.
 HQEPD_high_power_test.pdfpd_images.png 
  365   Thu May 23 01:42:46 2019 KojiOpticsCharacterizationC30665 high power testAn Excelitas C30665 PD with the
cap removed (SN07 in Case H slot #2) was
exposed to the beam with the optical power
 C30665_high_power_test.pdfpd_surface.jpg 
  364   Wed May 22 07:31:37 2019 KojiOpticsConfigurationCamera test (DCPD high power test)C30665 (3mm) camera test. The camera was
Canon PowerShot G7X MkII. Exposure 1/15s,
F 5.6, ISO 125, MF (~the closest), no zoom.
 20190521201838_IMG_7939_2.jpg 
  363   Mon May 20 19:53:17 2019 KojiOpticsConfigurationDCPD high power testWe want to perform a damage test of OMC
DCPDs with high power beam. The OMC DCPD
is the 3mm InGaAs photodiodes with high quantum
 BIAS.pdfP_20190520_204822.jpg 
  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
  
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