40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  OMC elog, Page 11 of 11  Not logged in ELOG logo
New entries since:Wed Dec 31 16:00:00 1969
ID Date Author Type Categoryup Subject
  484   Sat Feb 4 03:16:10 2023 KojiOpticsGeneralOMC #4: One Invar block bonded with tilt

The attached photo shows the resulting bond spread.


  485   Sat Feb 4 03:22:46 2023 KojiFacilityGeneralReady for the HEPA enclosure expansion

HEPA is quite low for a tall person and also the curtain on the back of us is always heavy. It's very tough for anyone to work with. (See Attachment 1)

I did the lab and table organization so that the HEPA expansion work can be resumed.
The 4th OMC is still on the table with the transport fixture (See attachment 3), but it is secured on the table. The risk of damaging the OMC is low now.

Chub can start working on the HEPA. Occasionally Camille and Thejas may work on the optical setup with the OMC. It is fine as long as both happen at the same time.

  486   Sat Feb 4 03:30:02 2023 KojiElectronicsGeneralOMC cables #4 arrived

The OMC cables #4 arrived on Feb 3rd. (See Attachment)

This shipment included two DCPD cables and two QPD cables. It means that the direct wiring from the PZT to the mighty mouse connectors was not included in the shipment.

  487   Sat Feb 4 03:33:22 2023 KojiGeneralGeneralOMC Lab Inventory

Attachment 1: North Cabinet 2nd from the left

Attachment 2: North Cabinet 3rd from the left

Attachment 3: South Cabinet (right)

  493   Wed Feb 15 16:00:46 2023 StephenElectronicsGeneralOMC cables #4 inspected


Updated ICS (Shipment-12578) and moved those parts to Storage-9482.

Inspection showed the following:

  • Serial numbers matched the packing list
  • SN S1301807: We observed some discoloration on the Gore wire close to one cable termination. [Attachment 1]
    • greenish tint
    • appeared to be superficial
    • slight removal observed when gently wiped with an IPA soaked AlphaWipe ("red wipe")
    • did not follow the helical of the teflon sheath
    • recommend additional inspection when Unit 4 build is resumed
  • Cables were returned to the box labeled "OMC Cables" in the south cabinets in the OMC lab.

Observations for aLIGO OMC Unit 4 Build

An ICS Record Navigator search of onboard OMC cables reveals the following quantities appear to have been fabricated for aLIGO.

  • D1300371 = Qty 3
  • D1300372 = Qty 5
  • D1300374 = Qty 3
  • D1300375 = Qty 5

The leftover cables are all of the long variety (D1300372, D1300375), and the received quantities make sense. 3 aLIGO OMC assemblies used quantity 3 of each cable, leaving the remaining cables which had been stored at LHO:

  • D1300372 = Qty 2
  • D1300375 = Qty 2

The received cables from LHO may apparently be used interchangably, and the extra slack (~ 5", compared to the D1300371, D1300374 part numbers) should be managable.

Next Steps for aLIGO OMC Unit 4 Build

We will move forward in fabricating Unit 4 with the received cables from LHO, despite their extra length.

To complete the Unit 4 on board cable set (refer to OMC_Lab/203), we will need to crimp pins onto the PZT leads, and we need to find, clean, and bake quantity 1 4 pin mighty mouse connector.

  • PZT leads terminate crimp pins inserted into Glenair Mighty Mouse 803-003-07M6-4PN-598A (per OMC_LAB/203, record navigator)
  • Cable bracket interface to OMCS is Glenair Mighty Mouse 803-003-07M6-4PN-598A (per D1300376-v3).

I will ask Chub to see if there are any Class A spares of the PZT termination connector already on hand.

  500   Mon Mar 6 12:25:08 2023 KojiFacilityGeneralHEPA Enclosure improvement

Chub, JC, and co worked on the HEPA enclosure improvement.

  501   Mon Mar 6 16:02:56 2023 Thejas OpticsGeneralOMC test setup locking

On Feb 16, Camille and I attampted at locking the OMC cavity. It was quick to re-align the beam to the cavity (by using only the fine adjustment of the output fibre couple). This was done by looking to minimize the power reflected from the cavity and observing the mode shapes on the CCD. After we achieved locking we placed the lid of the OMC back and turned off the laser. 

  248   Fri Dec 18 15:33:24 2015 KojiGeneralLoan / LendingLoan from Rich

Loan Record: I borrowed a PD can opener from Rich => Antonio Returned Sep 9, 2016

Tungsten Carbide Engraver (permanently given to the OMC lab)


  250   Thu Feb 18 21:08:32 2016 KojiGeneralLoan / Lending(all returned) Antonio loan

Antonio borrowed: Rich's PD cutter (returned), Ohir power meter(returned), Thorlabs power meter head, Chopper

  258   Tue Apr 5 18:14:55 2016 KojiGeneralLoan / LendingQPD Lending Crackle


QPD head
X-Z stage
Mounting brackets
DB15 cable
QPD matrix circuit
+/-18V power supply cable

  293   Thu May 3 21:45:58 2018 awadeGeneralLoan / LendingBorrowed toaster oven

I’ve borrowed the black and decker toaster oven to dry some sonicated parts. It is temporarly located in the QIL lab. 

  385   Tue Oct 22 15:54:59 2019 KojiElectronicsLoan / LendingBorrowed LB1005 from Cryo Cav

From Cryo Cav setup

Borrowed LB1005 Servo box -> OMC


  391   Mon Aug 10 15:34:04 2020 KojiFacilityLoan / LendingGlue bake oven

Black 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.

ELOG V3.1.3-