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ID Date Author Type Categoryup Subject Text Attachments
  307   Wed Aug 29 11:06:30 2018 KojiGeneralGeneralRF AM RIN and dBc conversion0. If you have an RF signal whose waveform
is , the amplitude is constant and 1.
  
  308   Sun Sep 23 19:42:21 2018 KojiOpticsGeneralMontecarlo simulation of the phase difference between P and S pols for a modeled HR mirror[Koji Gautam]


With Gautam's help,
I ran a coating design code for an HR mirror
 reflectivities.pngtransmission.pngphase_diff.pngphase_difference_histogram.png 
  309   Thu Sep 27 20:19:15 2018 AaronOpticsGeneralMontecarlo simulation of the phase difference between P and S pols for a modeled HR mirrorI started some analytic calculations of
how OMC mirror motion would add to the noise
in the BHD. I want to make some prettier
  
  310   Thu Nov 1 19:57:32 2018 AaronOpticsGeneralMontecarlo simulation of the phase difference between P and S pols for a modeled HR mirrorI'm still not satisfied/done with the
solution to this, but this has gone too long
without an update and anyway probably someone
  
  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 
  321   Thu Apr 4 20:07:39 2019 KojiSupplyGeneralPurchase== Office Depot ==
Really
Useful Box 9L x 6 (delivered)
  
  325   Fri Apr 5 23:30:20 2019 KojiGeneralGeneralOMC (002) repair completedOMC(002)
repair completed

When the cable harness of OMC(004)
 P_20190405_222401.jpgP_20190405_222509.jpgP_20190405_222529.jpg 
  326   Wed Apr 10 19:22:24 2019 KojiGeneralGeneralOMC(004): preparation for the PZT subassembly bonding Preparation for the PZT subassembly
bonding (Section 6.2 and 7.3 of T1500060
(aLIGO OMC optical testing procedure)
  
  327   Thu Apr 11 10:54:38 2019 StephenGeneralGeneralOMC(004): preparation for the PZT subassembly bonding


Quote:


  
  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 
  330   Thu Apr 11 21:22:58 2019 KojiGeneralGeneralOMC(004): PZT sub-assembly air baking[Stephen Koji]

The baking of the PZT subassemblies
was more complicated than we initially thought.
 temp_profile.pdfbake.xlsx 
  331   Sun Apr 14 23:58:49 2019 KojiGeneralGeneralOMC(004): PZT sub-assembly post air-bake inspection[Koji Stephen]

(Friday afternoon) We retrieved
the PZT sub-assemblies to the clean room.
  
  332   Mon Apr 15 00:08:32 2019 KojiGeneralGeneralOMC(004): PZT sub-assembly post air-bake inspection (Sub-assy #7)Sub-ASSY
#7

Probably the best glued unit among
 6x 
  333   Mon Apr 15 00:39:04 2019 KojiGeneralGeneralOMC(004): PZT sub-assembly post air-bake inspection (Sub-assy #8)Sub-ASSY
#8

Probably the best glued unit among
 8x 
  334   Mon Apr 15 01:07:30 2019 KojiGeneralGeneralOMC(004): PZT sub-assembly post air-bake inspection (Sub-assy #9)Sub-ASSY
#9

The most fractured unit among four.
 7x 
  335   Mon Apr 15 01:23:45 2019 KojiGeneralGeneralOMC(004): PZT sub-assembly post air-bake inspection (Sub-assy #10) Sub-ASSY
#10

Attachment #1: Mounting
 IMG_7589.jpgIMG_7590.jpgIMG_7591.jpgIMG_7592.jpg 
  343   Tue Apr 16 23:11:43 2019 KojiGeneralGeneralBorrowed items from the other labsApr 16, 2019
Borrowed
two laser goggles from the 40m. (Returned
  
  344   Wed Apr 17 09:08:47 2019 StephenGeneralGeneralOMC(004): Unwrapping and preparing breadboard[Stephen, Philip, Koji, Joe]

Breadboard D1200105 SN06 was selected
as described in eLOG
 IMG_7635_packaging_of_sn06.JPGIMG_7637_engraving_of_sn06.JPGIMG_7641_particulate_before_top_gun_large_face.JPGIMG_7644_particulate_before_top_gun_small_face.JPGIMG_7646_particulate_after_top_gun.JPG 
  345   Wed Apr 17 10:30:37 2019 PhilipOpticsGeneralOMC optical set-up day 1[Joe, Koji, Liyuan, Philip, Stephen]
Work done on 16.04.2019
  
  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 
  359   Thu May 9 17:35:07 2019 KojiOpticsGeneralAlignment strategyNotes
on the OMC cavity alignment strategy

- x3=1.17 γ + 1.40 δ, x4=1.40
 T1500060_OMC_Optical_Testing_Procedure.pdf 
  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 
  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
  
  367   Tue May 28 12:14:20 2019 StephenOpticsGeneralCM PZT Assembly Debonding of EP30-2 in Acetone[LiyuanZ, StephenA]

Downs B119

Summary:
 8x 
  368   Mon Jun 24 12:54:58 2019 KojiCleanGeneralHEPA BOOTHhttps://www.airscience.com/purair-flow-laminar-flow-cabinets   
  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 
  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 
  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 
  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 
  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 
  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 
  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 
  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 
  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 
  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 
  386   Fri Dec 6 00:55:25 2019 KojiOpticsGeneralBeamdump gluing[Stephen, Koji]

20 glass beamdumps were
bonded at the 40m cleanroom.
 6x 
  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 
  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 
  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 
  390   Mon Aug 10 15:29:54 2020 KojiGeneralGeneralItem lendingThe particle counter came back to the OMC
lab on Aug 10, 2020

 
  
  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
  
  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
  
  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),
  
  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 
  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.
  
  398   Fri Oct 23 19:09:54 2020 KojiGeneralGeneralParticle counter transfered to RadhikaSee this entry: https://nodus.ligo.caltech.edu:8081/40m/15642   
  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
  
  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 
  401   Fri Nov 20 18:51:23 2020 KojiGeneralGeneralInstrument loanFEMTO DLPCA200 low noise preamp (brand
new)

Keithley Source Meter 2450 (brand
  
  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 
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