 Sat Feb 2 20:35:02 2019, Koji, Optics, Characterization, Summary: OMC(002) HOM structure recalculation (after mirror replacement) 
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OMC (002) after repair
History:Mirror replacement after the damage at H1. Measurement date 2019/1/10 |
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Tue Sep 24 12:19:20 2019, Stephen, General, General, Dirty ABO test run prior to PZT Subassembly Bonding
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The 40m Bake Lab's Dirty ABO's OMEGA PID controller was borrowed for another oven in the Bake Lab (sound familiar? OMC
elog 377), so I have had to play with the tuning and parameters to recover. This bake seemed to inadequately match the intended temperature profile
for some reason (intended profile is shown by plotting prior qualifying bake for comparison). |
 Thu Jul 28 00:28:15 2022, Koji, General, General, OMC #002 Cable bracket replacement (2)
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Connector unmounting
- (Attachment 1) The connector nut rings were removed using an angled needle nose plier. The connector shell has a tight dimension
relative to the hole on the bracket. But of course, they could be extracted. |
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Thu Jul 28 00:46:47 2022, Koji, General, General, Subject: OMC #002 Cable bracket replacement (3)
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Checking the spare parts
- Conclusion for OMC#2: need PEEK cable ties
- for more OMCs: need more BHCS / PEEK cable ties / Helicoils |
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Thu Feb 18 21:08:32 2016, Koji, General, Loan / Lending, (all returned) Antonio loan
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| Antonio borrowed: Rich's PD cutter (returned), Ohir power meter(returned), Thorlabs power meter head, Chopper |
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Sat May 5 22:51:04 2018, Koji, Optics, General, 3IFO EOM Optical test
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| The 3IFO EOM test performed at the 40m. Result: 40m ELOG 13819 |
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Mon Jul 2 11:30:22 2018, Koji, Electronics, Characterization, 3IFO EOM impedance measurement
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[Rich Koji]
3IFO EOM (before any modification) was tested to measure the impedance of each port.
The impedance plot and the impedance data (triplets of freq, reZ, imZ) were attached to this entry. |
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Wed May 30 17:44:23 2018, Koji, Optics, Characterization, 3IFO EOM surface check
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3IFO EOM dark microscope images courtesy by GariLynn and Rich
Attachment1/2: Hole #1
Attachment3/4: Hole #2 |
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Sat Jan 17 11:40:04 2015, Koji, General, General, 3rd OMC completed
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Jan 15, 2015 3rd OMC completed
The face caps of the DCPD/QPD cables were installed (Helicoils inserted)
PD7&10 swapped with PD11(for DCPD T) and PD12(DCPD R). |
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Wed Jul 27 10:09:51 2022, Koji, General, General, 4+4 wire clamp in hand
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Regarding: D1200971
- 4 CLASS A wire clamp obtained from the OMC spare
- 4 more DIRTY wire clamp obtained from WB experiments (they no longer use these) |
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Mon Nov 9 22:06:18 2020, Koji, Mechanics, General, 5th OMC Transport Fixture
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I 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 (~screws) were
also brought there. |
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Thu Jul 26 20:57:07 2018, Koji, Electronics, Characterization, 9MHz port tuned impedance
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[Rich Koji]
The 9MHz port was tuned and the impedance was measured. |
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Mon Jul 1 12:38:49 2019, Koji, Optics, Characterization, A and M prisms perpendicularity measurement 6x
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[Stephen, Koji]
The perpendicularity of some of the A and M prisms were tested.
Results |
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Mon Nov 27 20:24:24 2017, Koji, General, General, A former LHO PD (Trans) removed from the OMC #002 for the shipment to Stockholm 6x
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Attachment 1: The PD was removed from the transmission side of the OMC #002 (former LHO OMC - the one blasted by the optical pulse in
Aug 2016).
It was confirmed that the PD has the scribing mark saying "A". |
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Mon Aug 4 18:59:50 2014, Koji, General, General, A memorandom
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On breadboarfd cabling for 3IFO OMC
D1300371 - S1301806
D1300372 - S1301808 |
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Mon Jul 25 18:25:04 2022, Koji, General, General, A/C Filter was replaced
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New filter PN
Grainger
TK70457312T Mini-Pleat Air Filter, Style - Air Filters Box, Performance Rating MERV 14, Nominal Filter Size 12x24x2
Previous |
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Fri Apr 5 18:18:36 2013, Zach, Optics, Configuration, AOM probably broken
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Quote:
Then, I started to check the AOM path. I noticed that the 1st (or -1st) order beam is very weak. |
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Mon Apr 1 10:28:03 2013, Koji, Mechanics, General, Additional UV blast for the top surface
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[Koji, Lisa, Jeff, Zach]
Jeffs concern after talking with the glue company (EMI) was that the UV blast for the top side was not enough. |
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Fri Apr 19 09:35:28 2019, Joe, General, , Adjusting cavity axis, re-alignment of OMC and locking
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[koji,philip, joe, liyuan, steven]
*still need to add photos to post*
PZT 11 was removed and inspected for so dust/dirt on the bottom of the prism. We saw a spot. We tried to remove this with acetone, |
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Fri Apr 12 09:25:31 2013, Koji, Optics, Characterization, Alignment of the OMC (without glue)
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[Zach Koji]
The first attempt not to touch the curved mirrors did not work. (Not surprising)
The eigenmode is not found on the mirror surface. |
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Thu May 9 17:35:07 2019, Koji, Optics, General, Alignment strategy
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Notes on the OMC cavity alignment strategy
- x3=1.17 γ + 1.40 δ, x4=1.40 γ + 1.17 δ
- This means that the effect of the two curved mirrors (i.e. gouy phases) are very similar. To move x3 and x4 in common is easy, but to do differentially |
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Mon Jun 23 21:54:16 2014, Koji, Optics, General, All of the gluing completed
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The bottom-side templates were removed.
The last beam dump was removed
TODO |
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Fri Jun 20 18:59:12 2014, Koji, Optics, General, All of the invar blocks have been glued
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All of the INVAR blocks have been glued.
I found thinner shims in the stock.
On Monday, the template will be removed. |
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Thu Jun 19 23:16:50 2014, Koji, Optics, General, All of the prisms have been glued
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- All of the PRISM mirrors have been glued
- 4 out of 5 beam dumps have been glued
TODO |
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Fri Jan 18 13:25:17 2013, Koji, Optics, Configuration, Autocollimator calibration
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An autocollimator (AC) should show (0,0) if a retroreflector is placed in front of the AC.
However, the AC may have an offset. Also the retroreflector may not reflect the beam back with an exact parallelism.
To calibrate these two errors, the autocollimator is calibrated. The retroreflector was rotated by 0, 90, 180, 270 deg |
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Wed Jan 16 14:10:50 2013, Koji, Optics, Characterization, Autocollimator tests of optics perpendicularity/parallelism
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The items:
- Autocollimator (AC) borrowed from Mike Smith (Nippon Kogaku model 305, phi=2.76", 67.8mm)
- Retroreflector (corner cube) |
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Sat Mar 26 18:22:24 2016, Koji, Electronics, Characterization, Baking / Contamination tests of the PDs
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For the production of the aLIGO PDs, the following transfer of the PDs were carried out
A1-23 Cage A1 -> G1
A1-25 Cage A2 -> G2 |
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Tue Apr 5 18:22:40 2016, Koji, Electronics, Characterization, Baking / Contamination tests of the PDs
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Possible reduction of the QE was observed after air-bake at 75degC.
Yesterday I received Cage G from Bob for intermediate test of the PD performance after air bake but before vacuum bake.
This cage was prepared to be the production pair. |
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Wed Jul 2 18:58:42 2014, Koji, General, General, Beam dump delamination
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While the OMC breadboard was being inspected, it was found that two out of five black-glass beam dumps showed sign of delamination.
(attached photos).
The base of the each beam dump is a fused silica disk (25mm dia.). The black glass pieces are bonded to the disk. The bond is EP30-2 |
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Thu Jul 3 17:45:18 2014, Koji, General, General, Beam dump delamination
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Here is the resolution.
I'll apply fillets of EP30-2 along the edges of the black glass (See figure).
In order to allow the air escape from the gap, the inside of the V will not be painted. |
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Fri Mar 29 08:55:00 2013, Zach, Optics, Configuration, Beam launched into fiber
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Quote:
Lisa and I concurred that it felt like we had converged to the optimum alignment and polarization, which would mean that the lack of |
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Thu Apr 4 23:44:52 2013, Koji, Optics, Configuration, Beam launched into fiber
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We had to move our flipper mirror to share the beam between Peter's setup and ours as our flipper is at the place where the ISS PD array base is supposed
to be!
There was no place to insert the flipper in the setup. We (Peter and Koji) decided to move the laser back for ~2". |
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Fri Dec 6 00:55:25 2019, Koji, Optics, General, Beamdump gluing 6x
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[Stephen, Koji]
20 glass beamdumps were bonded at the 40m cleanroom.
Attachment 1: We had 20 fused silica disks with a V-groove and 40 black glass pieces |
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Sat Mar 23 02:41:00 2013, Koji, Optics, General, Black glass beam dumps for the first OMC
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Received black glass beam dumps from MIT
- gluing by EP30-2 looks pretty fine. Enough sturdy.
- some gap visible between the glass => incident angle should be considered so that the first beam does not exit from the gap |
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Sat Jul 1 15:29:57 2017, Koji, Optics, General, Black glass cleaning / Final bonding for the emergency repair for OMC #002
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[Alena, Koji]
Report of the work on June 30.
1. Cleaning of the black glass beam dumps |
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Thu Jul 21 14:35:35 2022, Koji, General, General, Bond reinforcement blocks for the invar brackets
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Bond reinforcement blocks for the invar brackets:
Attachment 1: CLASS A glass prisms (the surplus of the 2016 repair)
Attachment 2: Dirty
reiforcement bars made of Aluminum
There are also many dirty prisms in the kit obtained from Stephen
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Tue Oct 22 15:54:59 2019, Koji, Electronics, Loan / Lending, Borrowed LB1005 from Cryo Cav
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From Cryo Cav setup
Borrowed LB1005 Servo box -> OMC
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Tue Apr 16 23:11:43 2019, Koji, General, General, Borrowed items from the other labs
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Apr 16, 2019
Borrowed two laser goggles from the 40m. (Returned Apr 29, 2019)
Borrowed small isopropanol glass bottole from CTN. |
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Thu May 3 21:45:58 2018, awade, General, Loan / Lending, Borrowed toaster oven
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| I’ve borrowed the black and decker toaster oven to dry some sonicated parts. It is temporarly located in the QIL lab. |
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Fri Jul 22 17:47:38 2022, Koji, General, General, C&B request for the reinforcement blocks
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OMC Reinforcement blocks
1. P/N D1600316; Version v4; Type 01; Qty 30; Source Chemistry Machine Shop
2. P/N D1600316; Version v4; Type 02; Qty 15; Source Chemistry Machine Shop |
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Thu May 23 01:42:46 2019, Koji, Optics, Characterization, C30665 high power test
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An Excelitas C30665 PD with the cap removed (SN07 in Case H slot #2) was exposed to the beam with the optical power of 1.4mW to 334mW.
After each illumination, the dark current and the dark noise level were tested. Also the photo image of the PD surface was taken each time.
- No significant change of the dark current after each illumination. |
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Tue May 28 12:14:20 2019, Stephen, Optics, General, CM PZT Assembly Debonding of EP30-2 in Acetone 8x
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[LiyuanZ, StephenA]
Downs B119
Summary: Beginning on 20 May 2019, two CM PZT assemblies were soaked in Acetone in an effort to debond the EP30-2 bonds |
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Fri May 10 09:33:22 2013, Koji, Supply, General, COMSOL simulation on the glass bracket stress
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Thu May 30 14:38:42 2013, Koji, Electronics, General, Cable fitting
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Yesterday Jeff and Chub worked on the cabling of the OMC. It turned out that the gender of the cable connectors
going from the cavity side to the connector bracket on top of the OMC were opposite from what is needed.
This way, the connectors can't fixed on the cable harness, thus they are free during the shipping. |
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Fri Apr 5 14:39:26 2013, Koji, Mechanics, Characterization, Calibration of the test PZTs after the heat cure
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We attached fused silica windows on the test PZTs. http://nodus.ligo.caltech.edu:8080/OMC_Lab/93
The glued assemblies were brought to Bob's bake lab for the heat cure. There they are exposed to 94degC heat for two hours (excluding ramp up/down
time). |
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Wed Apr 3 17:39:38 2013, Koji, Mechanics, Characterization, Calibration of the test PZTs before the glue test
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We want to make sure the responses of the PZT actuator does not change after the EP30-2 gluing.
A shadow sensor set up was quickly set-up at the fiber output. It turned out the ring PZTs are something really not-so-straightforward.
If the PZT was free or just was loosely attached on a plane by double-sided tape, the actuation response was quite low (30% of the spec). |
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Wed May 22 07:31:37 2019, Koji, Optics, Configuration, Camera test (DCPD high power test)
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C30665 (3mm) camera test. The camera was Canon PowerShot G7X MkII. Exposure 1/15s, F 5.6, ISO 125, MF (~the closest), no zoom.
This image was taken before the beam illumination. Will tune the green lighting to have some gradient on the surface so that we can see any deformation
of the surface. |
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Tue Jun 18 10:01:11 2013, Koji, Optics, Characterization, Cavity Finesse analysis
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This is the analysis of the cavity finesse data taken on Apr/13/2013 (before baking), May/30/2013 (after baking), and Jun/02/2013 (after cleaning).
If we believe this result, baking contaminated the cavity, and the first contact removed it. That agrees with the power measurement of the transmitted
light. |
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Fri May 16 00:13:36 2014, Koji, Optics, Characterization, Cavity mirror gluing part 1
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BS1/FM1/FM2 for I1OMC were glued.
FM1 had to be intentionally rotated.
FM1 had to be intentionally shifted to avoid scattering spot. |
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Tue Aug 14 03:29:06 2012, Koji, Supply, General, Clean supply rack
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Clean supplies & some cleaning tools are located at the right side of the entrance.
The file cabinet there was moved to the left side of the door, but will be removed eventually.
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