 Thu May 23 23:41:48 2013, Koji, Mechanics, General, DCPD/QPD Mount
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DCPD mounts and QPD mounts were attached on the breadboard. They are not aligned yet and loosely fastened.
DCPD (mounting 4-40x5/16 BHCS Qty4)
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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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Thu May 30 15:00:28 2013, Koji, Optics, General, QPD alignment
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The QPD alignment was adjusted using the aligned beam to the cavity and the 4ch transimpedance amplifier.
As I have a test cable for the QPD, I attached a DB9 connector on it so that I can use the QPD transimpedance
amplifier to read the photocurrent. The transimpedance of the circuit is 1kV/A. |
 Fri May 31 05:46:54 2013, Koji, Optics, General, QPD alignment 
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Peter F suggested to check the bottom surface of the PD housings if there is any protrusion/interference/whatever.
And that was true! It was found that the front side of QPD1 (Left) was lifted by a machining burr.
It seems that this burr consistently exists as the other one also have it (see QPD2 picture (right)) although it is not too terrible compared to |
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Mon Jun 3 21:19:03 2013, Koji, General, General, Planning
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Monday - Evening
(Koji)
[done] - DCPD alignment |
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Wed Jun 5 18:19:51 2013, Koji, General, General, Some recent photos from the OMC final test at CIT
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Applying First Contact for the optics cleaning
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Wed Jun 5 18:51:31 2013, Koji, General, General, L1 OMC shipped out
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[Koji, Jeff]
The L1 OMC finally sent out from Caltech!
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Fri Jun 7 16:04:44 2013, Koji, General, General, [LLO] OMC arrived
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[Koji Zach Suresh]
The OMC arrived at LLO without any destruction!
We found that one shock sensor on the box turned red, the other stayed white.
We brought the Perican case to the changing |
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Mon Jun 10 10:04:37 2013, Koji, General, General, [LLO] OMC Test
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[Koji Zach]
We worked on the OMC test over the weekend.
- At the beginning, the measured OMC transmission was ~85% even after subtracting the junk light and sidebands from the calculation. |
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Thu Jun 13 12:04:57 2013, Koji, General, General, [LLO] OMC Optical Test - completed
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| https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=7373 |
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Thu Jun 13 12:12:20 2013, Zach, General, General, [LLO] OMC and OMCS in LVEA
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https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=7395
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Fri Jun 14 06:35:21 2013, Jeff, General, General, [LLO] L1 OMC status
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https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=7410
Weights:
Suspension cage and transportation box: 250.8lb |
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Tue Jun 18 15:45:38 2013, Koji, General, General, [LLO] OMC installation in HAM6
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OMC installed in HAM6!
https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=7486
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Fri Jun 28 12:20:49 2013, Koji, General, General, Dmass's loan of Thorlabs HV amp
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http://nodus.ligo.caltech.edu:8080/Cryo_Lab/799
(KA: Returned upon H1OMC building) |
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Fri Aug 9 10:09:56 2013, Koji, General, General, PZT Assembly #3/#4
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Yesterday, Jeff and I bonded the PZT assemblies (#3/#4).
The attached is the arrangement of the components |
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Mon Aug 12 20:22:19 2013, Koji, General, General, PZT Assembly #5/#6
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PZT Assembly #5/#6 were glued on Fri Aug 9th
They are removed from the fixture on Mon Aug 12th.
All of the four PZT assemblies were moved to the OMC lab. |
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Fri Aug 16 16:36:19 2013, Koji, Optics, General, Optics List
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Link to the "Mirror/PZT Characterization links"
Breadboard
BB1 OMC(001) OMC |
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Fri Aug 16 17:21:38 2013, Koji, General, General, [OMC002] Build started
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[Jeff Koji]
The breadboard (SN2) was loaded on the transportation fixture.
The laser side template was installed and the cavity mirrors were placed. |
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Thu Aug 22 15:34:03 2013, Koji, Optics, General, OMC Cavity side gluing
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[Koji Jeff]
o BS1, FM1, FM2 prisms were glued
=> This fixed the unstability of the OMC locking |
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Thu Aug 29 18:55:36 2013, Koji, Mechanics, General, I1 OMC top side gluing (UV)
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The glass components for the I1 OMC top side were glued by the UV glue.
Breadboard SN#4
Wire bracket SN#5/6/7/8 |
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Fri Aug 30 12:14:50 2013, Koji, Optics, General, H1 OMC Cavity length adjustment
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Short conclusion:
The roundtrip cavity length for the H1 OMC was adjusted to be 1.145m
instead of 1.132m such that the 19th HOMs of the lower sideband do not get resonant together with the carrier. |
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Fri Aug 30 12:22:56 2013, Koji, Optics, General, H1 OMC Cavity side UV gluing
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H1 OMC Cavity side optics was glued on the breadboard
Curved mirror gluing
- Applied the UV glues to CM1/CM2 prisms. |
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Fri Aug 30 12:25:29 2013, Koji, General, General, H1 OMC Invar mount gluing
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The Invar Mounting Blocks were glued on the breadboard.
Serial number #1/2/5/6/7/8 -> I1 OMC cable side
Serial number #9/10/11/12 -> H1 OMC cavity side |
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Tue Sep 3 17:03:25 2013, Koji, General, General, H1 OMC gluing completed
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[Koji Jeff]
H1 OMC All Gluing completed
5 Glue H1 beam dumps (UV) |
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Wed Sep 4 22:22:54 2013, Koji, General, General, H1 OMC wrapped and moved to the bake lab.
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[Koji, Jeff]
We moved the H1OMC to the bake lab.
Chub set up the vacuum bake oven (Oven F) and running without the actual OMC. |
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Sat Sep 7 17:20:56 2013, Koji, General, General, OMC/PD lab optical table wrapping
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[Koji Jeff]
In order to prepare for the splinkler installation on the HEPA enclosure, the table with the optics was wrapped with Ameristat sheets. |
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Fri Sep 13 15:09:20 2013, Koji, General, General, Sprinkler installation: done
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| A sprinkler head was installed on the HEPA enclosure. The head is covered with a plastic cap. |
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Tue Oct 22 17:17:59 2013, Koji, General, General, H1OMC cabling
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[Chub, Jeff, Koji]
We worked on the wiring and routing of the cables.
- The cables for the PZT was installed first. |
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Wed Oct 23 02:45:07 2013, Koji, General, General, PD realignment
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DCPD2 got misaligned during the cable installation. The PD alignment procedure have been gone through again.
Cavity locking
- Removed the FC layers for the cavity related mirrors. |
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Mon Nov 4 19:43:56 2013, Koji, General, General, H1OMC Packed
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H1OMC PZT connector was replaced with the correct one. This was the final step for H1OMC.
Jeff and I packed the OMC and put it in the perikan case. It will be shipped tomorrow.
The other tools are also packed in the other box. Here is the list of the items |
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Thu Nov 21 00:05:35 2013, Koji, General, General, H1OMC electronics arrangement
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Checked the PZT arrangement: Mighty Mouse Pin1&2 -> PZT2 (DCPD side), Mighty Mouse Pin3&4 -> PZT1 (QPD side)
DCPD response:
Illuminate DCPD1 (T) -> DCPD B responded in MEDM |
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Tue Dec 10 16:41:51 2013, Koji, General, General, To Buy
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| Masks / Wipes => done |
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Tue Feb 18 18:58:38 2014, Koji, General, General, LHO H1 OMC installation photos
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LHO OMC installation photos
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Fri Feb 28 19:50:11 2014, Koji, General, General, Misalignment ABCD matrix for the aLIGO OMC
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Relationship between mirror misalignment and cavity mode shift was calculated.
The technique described in T0900647 by Sam Waldman was used.
The angles and displacement of the mirrors and beams are defined in the attached figure. |
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Thu Apr 17 21:39:25 2014, Koji, Optics, General, More alignment
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STORY:
- The cavity mirrors have scattering spots. The cavity alignment should have been scanned to find a cavity mode to have lowest loss possible.
BTW, We only have horizontal dof for the alignment scan. |
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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 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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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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Tue Jun 24 18:43:15 2014, Koji, General, General, ICS entries for the OMC baking/assembly
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For baking:
Assembly Name aLIGO Output Mode Cleaner
Assembly Number D1201439 |
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Fri Jun 27 12:29:50 2014, Koji, General, General, OMC baking
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The OMC went into the oven at around 2PM on Thursday. It will be baked at 80degC for 48 hours.
The RGA result will be obtained on Monday.
Link to the ICS entry |
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Fri Jun 27 18:51:33 2014, Koji, General, General, Supply
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PTOUCH TAPE (12mm white) x 2
9V batteries |
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Wed Jul 2 16:41:43 2014, Koji, General, General, OMC baking
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OMC is back from the oven today.
To Do:
Optical tests |
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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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Sun Jul 6 02:45:56 2014, Koji, Optics, General, FSR Measurement
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3rd OMC FSR / Finesse measurement
RF AM was injected by detuning a HWP. |
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Mon Jul 7 01:36:03 2014, Koji, General, General, To Do
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Optical tests
Cleaning
Power Budget
FSR measurement
TMS
measurement
TMS measurement (with DC voltage on PZTs)
PZT DC response
PZT AC response
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Tue Jul 8 04:08:06 2014, Koji, General, General, Expoxy reapplication for beam dumps
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Firstly, the excess epoxy was removed using a cleaned razor balde
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Thu Jul 10 01:39:38 2014, Koji, Electronics, General, PZT wire
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Rich came to the OMC lab. Pins for the mighty mouse connector were crimped on the 4 PZT wires.
We found the male 4pin mighty mouse connector in the C&B area.
The cable inventory was checked with ICS/DCC combo. It turned out that most of the on-board cables |
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Thu Jul 10 08:34:57 2014, Koji, General, General, To Do
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Optical tests
Cleaning
Power Budget
FSR measurement
TMS
measurement
TMS measurement (with DC voltage on PZTs)
PZT DC response
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Sun Jul 20 17:20:39 2014, Koji, General, General, The 3rd (LIO) OMC was shipped out to LHO
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The 3rd (LIO) OMC was shipped out to LHO on Friday (Jul 18) Morning.
At LHO
- All of the on-breadboard cables should be attached and tied down. |