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Entry  Thu Jul 26 20:57:07 2018, Koji, Electronics, Characterization, 9MHz port tuned impedance impedance_eom.pdfeom9.pdfeom_models_9MHz.pdf
[Rich Koji]

The 9MHz port was tuned and the impedance was measured.
Entry  Tue Aug 7 15:43:12 2018, Koji, Electronics, Characterization, New LLO EOM stuffed P_20180806_154457.jpgimpedance_eom.pdfimpedance_eom_zoom.pdf
[Rich, Dean, Koji]

Stuffed all inductors for the new LLO EOM. As the impedances were sensitive to the positions of the inductors in the housing, they were glued
with a glue gun.
Entry  Tue Oct 22 15:54:59 2019, Koji, Electronics, Loan / Lending, Borrowed LB1005 from Cryo Cav 
From Cryo Cav setup

Borrowed LB1005 Servo box -> OMC

 
Entry  Sat Nov 21 13:58:30 2020, Koji, Electronics, Characterization, Dark Current Measurement for InGaAs QPDs Q3000_dark_current.pdf
Dark current measurement for InGaAs QPDs (OSI FCI-InGaAs-Q3000) has been done using Keithley 2450 and Frank's diode test kit. Frank's setup uses
various custom instruments which are no longer exist, therefore the kit was used only for switching between the segments.

The diodes were serialized as 81, 82, 83, 84, continuing the numbering for the OMC QPDs. The numbers are engraved at the side and the back of
    Reply  Sun Nov 22 13:49:12 2020, Koji, Electronics, Characterization, Impedance Measurement for InGaAs QPDs impedance_measurement.pdfP_20201121_183830.jpgimpedance_test.pdfQ3000_impedance_test.pdf
To know any anomaly to the junction capacitance of the QPD segments, the RF impedances were tested with a hand-made impedance measurement.
All segments look almost identical in terms of capacitance.

Measurement setup:
    Reply  Mon Nov 23 23:17:19 2020, Koji, Electronics, Characterization, The dark noise of the Q3000 QPDs Q3000_dark_noise_81.pdfQ3000_dark_noise_82.pdfQ3000_dark_noise_83.pdfQ3000_dark_noise_84.pdf
The dark noise levels of the four Q3000 QPDs were measured with FEMTO DLPCA200 low noise transimpedance amp.

The measurement has been done in the audio frequency band. The amp gain was 10^7 V/A. The reverse bias was set to be 5V and the DC output of
the amplifier was ~40mV which corresponds to the dark current of 4nA. It is consistent with the dark current measurement.
    Reply  Tue Nov 24 10:45:07 2020, gautam, Electronics, Characterization, The dark noise of the Q3000 QPDs 
I 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 this QPD will be reading
out photocurrent given the low frequency behavior looks fine? The broad feature at ~80 kHz is the usual SR785 feature I guess, IIRC it's got to do
with the display scanning rate.
    Reply  Tue Nov 24 12:27:18 2020, Koji, Electronics, Characterization, The dark noise of the Q3000 QPDs 
The 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 special to see the RF band
dark noise.
With this situation, I stated "the RF dark noise should be characterized by the actual WFS head circuit." in the 40m ELOG.
Entry  Wed Jun 20 00:10:53 2012, Koji, Facility, General, Hole on the wall was patched P6191706.jpg
 
Entry  Wed Aug 1 19:35:00 2012, Koji, Facility, General, Floor cleaned / Workbench being built / Table top defect P8011949.JPGP8011947.JPGP8011948.JPG
- The floor of the room was cleaned and waxed!
- Sticky mats are placed! Now we require shoe covers!
Entry  Sat Aug 11 00:59:14 2012, Koji, Facility, General, Laser Safety Barrier P8131960.JPG
It seemed that a laser safety barrier was installed today!?
Entry  Wed Aug 22 20:16:43 2012, Koji, Facility, General, Workbenches have been installed / Clean room stools P8171968.jpgP8171969.jpg
Last Friday, new workbenches were installed. Vladimir got a new table and a cleanroom stool.
Entry  Wed Dec 26 14:33:33 2012, Koji, Facility, General, Lase Interlock wired PC263073.jpgPC263074.jpgPC263075.jpg
Two switches are connected in series.
Entry  Tue Jan 22 11:10:25 2013, Koji, Facility, General, Eyeware storage and hooks for the face shields are installed P1223116.JPG
A carpenter has come to install the eyeware storage and hooks for the face shields.
Entry  Sat Mar 23 02:32:23 2013, Koji, Facility, General, N2 cylinder delivered P3233349.jpg
Preparation for ionized N2 blow
- 99.9998% N2 cylinder delivered (ALPHAGAZ 2 grade by AIR LIQUIDE) ALPHAGAZ
2 [PDF]
Entry  Fri Sep 8 15:14:05 2017, Koji, Facility, General, Preparation for the plumbing work 7x
[Steve, Aaron, Koji]

We've finished the preparation for the forthcoming plumbing work on (nominally) Sept 16th Saturday.
We've covered most of the west side of the OMC lab with plastic sheets and wraps.
Entry  Mon Aug 10 15:34:04 2020, Koji, Facility, Loan / Lending, Glue 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.
Entry  Thu Jun 23 21:03:33 2022, Koji, Facility, General, Moving the small optical table to CAML (TCS Lab) PXL_20220624_035628602.jpg
I've cleared the small optical table and wondered how to move it out of the room. Fortunately, the north side of the big table had wide enough clearance
and let the 36" wide table go through. This was easy without moving other heavy stuff.

From here to the door, a bit of work is required. A possibility is to roll the laser blocking wall to the south side of the big table. This will
Entry  Fri Jun 15 15:45:49 2012, Koji, General, General, OMC Plan 
LIGO Document G1200683-v1: 
aLIGO OMC fabrication and testing plan
aLIGO OMC wiki
Entry  Sat Jun 16 08:53:09 2012, Koji, General, General, To Do List 
Facility

    Work
    
        Replacing wooden work benches
        
    
       W60" x H28-34" x D30" 
Entry  Sat Jul 14 02:16:07 2012, Koji, General, General, Plan Update: July P7071878.jpg
Facility/Supplies

    Work in progress     
    
        Floor cleaning
        Plug slits on the roof of the HEPA booth - blanking panels have been ordered 
Entry  Tue Jul 24 11:41:29 2012, Koji, General, General, Useful references 
Nicolas Smith,
LIGO Document T0900383-v1 
3mm Photodiode Characterization for Enhanced LIGO
Entry  Tue Jul 31 21:29:43 2012, Koji, General, General, Work completed in July [!] 

    Completed Work: Facility/Supplies
    
        Plug a big hole on the wall [ELOG]
        Purchasing work benches
Entry  Tue Jul 31 21:33:17 2012, Koji, General, General, Plan Update: August [!] 
Completed work of the previous months: [Jul] [Aug] [Sep] [Oct] [Nov] [Dec]

Facility/Supplies

    Work done
    
        Floor
Entry  Tue Oct 16 14:50:54 2012, jamie, jeff, General, General, OMC breadboard/plate measurement dimensions 
We have measured the dimensions and mass of the OMC glass plates/breadboards:




S/N
Mass (g)
Length
(mm)
Width (mm)
Height (mm)
Notes


01
6146
449.66
149.85
41.42,
Entry  Tue Oct 16 15:50:09 2012, Koji, General, General, Work completed in August/September [!] 

    Work done
    
        Floor cleaning
[ELOG]
        Placing sticky
mats [ELOG]
        Label Maker
Entry  Tue Oct 16 15:51:01 2012, Koji, General, General, Plan Update: October [!] 
Completed work of the previous months: [Jul] [Aug]
[Sep] [Oct] [Nov] [Dec]

Facility/Supplies
Entry  Wed Nov 7 20:21:42 2012, Koji, General, General, Work completed in October [!] 
Completed work of the previous months: [Jul] [Aug]
[Sep] [Oct] [Nov]
[Dec]
Entry  Wed Nov 7 20:44:11 2012, Koji, General, General, Plan Update: November [!] OMC_Project_Schedule.pdf
Completed work of the previous months: [Jul] [Aug]
[Sep] [Oct] [Nov]
[Dec]
Entry  Mon Dec 31 01:45:04 2012, Koji, General, General, Work completed in Nov and Dec [!] 
Completed work of the previous months: [Jul] [Aug]
[Sep] [Oct] [Nov] [Dec]
Entry  Thu Feb 7 21:35:46 2013, Koji, General, General, Dmass's loan of LB1005 / A2&C2 sent to Fullerton / First Contact @40m P2053119.jpgP2053120.JPG
Dmass borrowed the LB1005 servo amp from the OMC lab.
It happened this week although it seems still January in his head. Got it back on Mar 24th
The A2 and C2 mirrors have been sent to Josh Smith at Fullerton for the scatterometer measurement.
Entry  Thu Mar 14 22:18:23 2013, Koji, General, General, New loans for the diode test 
ALL returned

Loan from ATF:

2 blue banana cables returned on
Jun 4, 2013
Entry  Mon Mar 25 02:04:05 2013, Koji, General, General, OMC building plan / procedure ~ WB18 
WB 18 March 

    Diode test
    
        Dark current / Dark noise / Impedance
        Quantum Efficiency test (but with glass)
        Diode given
    Reply  Mon Mar 25 18:34:25 2013, Koji, General, General, OMC building plan / procedure ~ Mar 25 Mon 
25 March (Mon): 
Inspect the test PZT assembly

    => Give it to Bob. (done)

Glue topside components 
Entry  Tue Mar 26 22:33:07 2013, Koji, General, General, Loan for the OMC building 
Loan from PSL Lab
- 300mm mirror with Ultima mount and pedestal
- Isopropanol small glass bottleReturned on Apr 12 2013. 
    Reply  Wed Mar 27 20:54:45 2013, Koji, General, General, OMC building plan / procedure ~ Mar 26 Mon 
26 March (Tue):
- Curved mirror characterization (Koji, done)
 - Input optics for the cavity locking (Zach)
    Reply  Wed Mar 27 20:54:54 2013, Koji, General, General, OMC building plan / procedure ~ Mar 27 Wed 
27 March (Wed)
- AOM drift investigation (Lisa, Zach)
- Cavity input optics ~ Fiber coupling (Zach)
    Reply  Wed Mar 27 20:55:10 2013, Koji, General, General, OMC building plan / procedure ~ Mar 28 Thu 
28 March (Thu): 

    Rebuild the bottom template in the lab
    Place the bottom template on the OMC
    Glue the PZTs on the mounting
prisms (x2)
    Glue the curved mirrors on the PZTs (x2)
    R&T measurement
    Placing optics on the OMC breadboard
Entry  Thu Apr 11 15:10:22 2013, Koji, General, General, OMC Progress 
[Zach, Jeff, Koji]

- Jeff configured the bottom side template to have a nominal value
obtained from the solid works model. Note that the thickness of the
Entry  Thu Apr 18 11:43:59 2013, Koji, General, General, Mounting Glass Bracket Failure 
[Jeff, Koji]
- While we were working on the optics alignment, one of the mounting brackets made of glass god tore apart into two when a holding screw was removed.
The glass component had a crack at the very middle of the part.
Entry  Thu Apr 18 11:59:02 2013, Koji, General, General, DCPD path gluing 
[Jeff, Koji]
DCPD path gluing
Usual preparation
Entry  Fri May 3 21:09:08 2013, Koji, General, General, OMC is back 
L1 OMC is back on the table for the action next week.
Entry  Wed May 8 15:36:50 2013, Koji, General, General, Latest OMC schedule 

May
(done) Mon  6th: Invar plate arrival / Spot position measurement
(done) Tue  7th: Invar plate cleaning / Spot position measurement
/ EP30-2 arrival / Invar plate gluing to the test mounting brackets
(done) Wed  8th: Invar plate cleaning done / Baking of the test pieces (with Bob's
oven)
Thu  9th: ***After bake torque/force test***

***If the invar plate passes the test***
Thu  9th Light side invar plate gluing
Fri 10th Cable
    Reply  Mon May 13 15:00:23 2013, Koji, General, General, Current most reliable OMC schedule 
May
Tue 14th The OMC given to Bob (Air bake & Vac bake)

Mon 20th The OMC received from Bob
         Apply First contact
 
       Diode mount adjustment / Electronic tests
Tue 21st Diode mount adjustment / Electronic tests / Optical tests
Wed 22nd Final cabling (***Chub***)
Thu
23rd Final cabling / Packing
Fri 24th Packing / Shipping

Mon 27th? Arrival to LLO / Koji fly to LLO
Tue 28th Test on the optical bench
Wed 29th Test
Entry  Mon May 20 14:59:21 2013, Koji, General, General, OMC is out from the oven 
The OMC came back to the table again.
No obvious change is visible: no crack, no delamination
The OMC was fixed on the table and the beam was aligned to the cavity
    Reply  Tue May 21 18:28:08 2013, Koji, General, General, Current most reliable OMC schedule 
- The wrong Mighty Mouse connectors for the PZT wires were prepared. The correct ones are in the vacuum oven till Tuesday morning.
- The thread holes for the cable pegs are 1/4-20 rather than 10-24.  This requires re-machining of the cable pegs & the C&B.
- We are waiting for the fast shipment of the from LHO
Entry  Mon Jun 3 21:19:03 2013, Koji, General, General, Planning 
Monday - Evening
(Koji)
[done] - DCPD alignment
Entry  Wed Jun 5 01:06:35 2013, Zach, General, Characterization, L1 OMC as-built diagram L1OMC_asbuilt.pdf
 D1300507
 
Entry  Wed Jun 5 18:19:51 2013, Koji, General, General, Some recent photos from the OMC final test at CIT 
Applying First Contact for the optics cleaning
Entry  Wed Jun 5 18:51:31 2013, Koji, General, General, L1 OMC shipped out CAM00011.jpgP6054027.JPG
[Koji, Jeff]
The L1 OMC finally sent out from Caltech!
ELOG V3.1.3-