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Entry  Sun Jul 6 03:56:40 2014, Koji, Optics, Characterization, HOM measurement with PZT vol swept Cav_scan_response_PZT1.pdfCav_scan_response_PZT2.pdfOMC_HOM_140705.pdf
Cavity FSR/TMS measurement (2014/7/5) with PZT voltages swept from 0V to 200V (50V step)
    Reply  Sun Jul 6 08:31:14 2014, Koji, Optics, Characterization, HOM measurement with PZT vol swept HOM_plot.pdf
3rd OMC, HOM diagram at PZT1=0V and PZT2=50V.
First coincidence with the carrier is the 32nd-order carrier mode. Very good.
Entry  Sun Jul 6 02:46:20 2014, Koji, Optics, Characterization, OMC power budget 
3rd OMC power budget (2014/7/2)
Input power: 34.8mW
Entry  Sun Jul 6 02:45:56 2014, Koji, Optics, General, FSR Measurement finesse_measurements_log.pdf
3rd OMC FSR / Finesse measurement
RF AM was injected by detuning a HWP.
Entry  Tue Jun 24 18:43:15 2014, Koji, General, General, ICS entries for the OMC baking/assembly 
For baking:

    Assembly Name aLIGO Output Mode Cleaner
    Assembly Number D1201439
    Reply  Fri Jun 27 12:29:50 2014, Koji, General, General, OMC baking P6266536.jpg
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
       Reply  Wed Jul 2 16:41:43 2014, Koji, General, General, OMC baking 
OMC is back from the oven today.
To Do:
Optical tests
Entry  Fri Jun 27 18:51:33 2014, Koji, General, General, Supply 
PTOUCH TAPE (12mm white) x 2
9V batteries
Entry  Thu Jun 19 23:16:50 2014, Koji, Optics, General, All of the prisms have been glued P6196525.JPG
- All of the PRISM mirrors have been glued
- 4 out of 5 beam dumps have been glued

TODO
    Reply  Fri Jun 20 18:59:12 2014, Koji, Optics, General, All of the invar blocks have been glued 
All of the INVAR blocks have been glued.
I found thinner shims in the stock.
On Monday, the template will be removed.
       Reply  Mon Jun 23 21:54:16 2014, Koji, Optics, General, All of the gluing completed 
The bottom-side templates were removed.
The last beam dump was removed
TODO
Entry  Sat May 17 07:40:14 2014, Koji, Optics, Characterization, I1OMC cavity mirrors glued Cav_scan_response_140516_Pitch.pdfCav_scan_response_140516_Yaw.pdf
I1OMC cavity mirrors were glued.
FSR = 264.82MHz => Lcav = 1.132m (nominal 1.132m)
TMS/FSR for Vpzt1=Vpzt2=0: 0.2185 (V) and 0.2196 (H) (nominal 0.219)
Entry  Fri May 16 00:13:36 2014, Koji, Optics, Characterization, Cavity mirror gluing part 1 
BS1/FM1/FM2 for I1OMC were glued.
FM1 had to be intentionally rotated.
FM1 had to be intentionally shifted to avoid scattering spot.
Entry  Wed May 14 02:15:15 2014, Koji, Optics, Characterization, FSR/TSM adjustment of the OMC cavity  Cav_scan_response_140503_Pitch.pdfCav_scan_response_140503_Yaw.pdf
1. FSR was adjusted and measured with "the golden arches" technique again.
FSR = 264.8412 MHz +/- 1400Hz => Lcav = 1.13197 m. (nominal 1.132m)
2. Transverse mode spacings for the vertical and horizontal modes were measured.
Entry  Mon May 12 22:43:02 2014, Koji, Optics, Characterization, Measured FSR/TSM of the OMC cavity Cav_scan_response_Pitch.pdfCav_scan_response_Yaw.pdf
Data analysis of the FSR/TSM measruement last week.
1. FSR was measured with "the golden arches" technique.
FSR = 263.0686 MHz +/- 900Hz
Entry  Thu Apr 17 21:39:25 2014, Koji, Optics, General, More alignment 
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.
Entry  Tue Mar 25 17:10:10 2014, Koji, Optics, Characterization, OMC spot position estimation OMC_spot.pdf
Spot positions were inferred from the photos
Entry  Mon Mar 3 02:46:21 2014, Koji, General, Characterization, Spot positions scanned 
Spot positions on CM1 and CM2 scanned according to the recipes provided by the previous entry.
The best result obtained was:
Transmission from FM2: 32.7mW
Entry  Fri Feb 28 19:50:11 2014, Koji, General, General, Misalignment ABCD matrix for the aLIGO OMC misalignment.pdf
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.
Entry  Tue Feb 18 18:58:38 2014, Koji, General, General, LHO H1 OMC installation photos 
LHO OMC installation photos
Entry  Tue Dec 10 16:41:51 2013, Koji, General, General, To Buy 
Masks / Wipes => done
Entry  Thu Nov 21 00:05:35 2013, Koji, General, General, H1OMC electronics arrangement H1OMC_cable_arrangement.pdf
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
Entry  Mon Nov 4 19:43:56 2013, Koji, General, General, H1OMC Packed 
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
Entry  Wed Oct 23 02:45:07 2013, Koji, General, General, PD realignment 
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.
Entry  Tue Oct 22 17:17:59 2013, Koji, General, General, H1OMC cabling 
[Chub, Jeff, Koji]
We worked on the wiring and routing of the cables.
- The cables for the PZT was installed first. 
Entry  Tue Oct 15 18:50:08 2013, Koji, Optics, Characterization, QPD alignment 
1) Deburr the bottom surfaces of the QPD housings
2) Aligned the QPDs
 
    Reply  Wed Oct 16 19:16:29 2013, Koji, Optics, Characterization, PD alignment 
 
 shim 1.5mm 001/002
Entry  Mon Oct 14 15:50:55 2013, Koji, Optics, Characterization, H1 OMC Power budget OMC_power_budget.pdf
LHO OMC power budget

    
        
            Date

           2013/9/17
            2013/9/17
            2013/10/16
Entry  Mon Oct 14 13:40:16 2013, Koji, Optics, Characterization, H1 OMC Optical testing 
Since the middle of September, the optical tests of H1 OMC were took place.
Here is summary of the progress.
TEST1: FSR/FINESSE measurement before applying First Contact 
Entry  Sat Sep 7 17:20:56 2013, Koji, General, General, OMC/PD lab optical table wrapping P9064377.JPG
[Koji Jeff]
In order to prepare for the splinkler installation on the HEPA enclosure, the table with the optics was wrapped with Ameristat sheets.
    Reply  Fri Sep 13 15:09:20 2013, Koji, General, General, Sprinkler installation: done P9134379.jpgP9134378.jpg
A sprinkler head was installed on the HEPA enclosure. The head is covered with a plastic cap.
Entry  Wed Sep 4 22:22:54 2013, Koji, General, General, H1 OMC wrapped and moved to the bake lab. 
[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.
Entry  Tue Sep 3 17:03:25 2013, Koji, General, General, H1 OMC gluing completed 
[Koji Jeff]
H1 OMC All Gluing completed
5 Glue H1 beam dumps (UV)
Entry  Fri Aug 30 12:25:29 2013, Koji, General, General, H1 OMC Invar mount gluing P8304368.JPGP8304370.JPG
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
Entry  Fri Aug 30 12:24:28 2013, Koji, Optics, Characterization, H1OMC Spot positions DCPD1.pngDCPD2.pngQPD1.pngQPD2.png
Beam heights on the diodes

DCPD1: 14.459mm -> With 1.5mm shim, the beam will be 0.038mm too low.
Entry  Fri Aug 30 12:22:56 2013, Koji, Optics, General, H1 OMC Cavity side UV gluing 
H1 OMC Cavity side optics was glued on the breadboard
Curved mirror gluing
- Applied the UV glues to CM1/CM2 prisms.
Entry  Fri Aug 30 12:14:50 2013, Koji, Optics, General, H1 OMC Cavity length adjustment Gouy_FSR_130827.nb.zipP8284343.jpg
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.
Entry  Thu Aug 29 18:55:36 2013, Koji, Mechanics, General, I1 OMC top side gluing (UV) 
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
Entry  Thu Aug 29 02:52:50 2013, Koji, Optics, Characterization, H1OMC Curved Mirror Alignment Cav_scan_response_130828_Pitch.pdfCav_scan_response_130828_Yaw.pdf
Cavity parameter was measured with 50V bias on PZT1 (CM1)
- PZT combination was changed: PZT1 #21 (PZT ASSY#6) / PZT2 #25 (PZT ASSY #4)
- 19th HOMs of the USB makes accidental resonance with the nominal cavity length.
Entry  Tue Aug 27 17:02:31 2013, Koji, Mechanics, Characterization, Spot position measurement on the diode mounts DCPD1.png
After the PZT test, the curved mirrors were aligned to the cavity again.
In order to check the height of the cavity beam, the test DCPD mount was assembled with 2mm shim (D1201467-3)
The spot position was checked with a CCD camera.
Entry  Thu Aug 22 15:40:15 2013, Koji, Electronics, Configuration, PZT endurance test P8214340.jpgP8214337.jpgIR_0457.jpgIR_0461.jpg
[Koji, Jeff]
Background
In response to the failure of one of the PZTs on L1OMC (LLO:8366), we
    Reply  Fri Aug 23 19:24:32 2013, Koji, Electronics, Configuration, PZT endurance test (II) PZT_shaking.png
The PZT tests were finished with the conclusion that the PZT won't be damaged with our expected usage.

This is another test of the PZTs to make sure small (~10V) reverse voltage does not break the PZTs.
Background
Entry  Thu Aug 22 15:34:03 2013, Koji, Optics, General, OMC Cavity side gluing 
[Koji Jeff]
o BS1, FM1, FM2 prisms were glued
=> This fixed the unstability of the OMC locking
Entry  Wed Aug 21 08:31:21 2013, Koji, Optics, Characterization, H1 OMC cavity alignment 
Alignment of the H1 OMC cavity mirrors
- The cavity mirrors as well as the first steering mirror were aligned on the cavity side template.
- The locking of the cavity was not so stable as before. Some high freq (several hundreds Hz) disturbance makes the cavity
Entry  Fri Aug 16 17:21:38 2013, Koji, General, General, [OMC002] Build started 
[Jeff Koji]

The breadboard (SN2) was loaded on the transportation fixture.

The laser side template was installed and the cavity mirrors were placed.
Entry  Fri Aug 16 16:36:19 2013, Koji, Optics, General, Optics List 
Link to the "Mirror/PZT Characterization links"

Breadboard

BB1 OMC(001) OMC
Entry  Tue Apr 16 09:43:58 2013, Koji, Optics, Configuration, Mirror list for L1OMC OMC_breadboard_mirror_config.png
L1 OMC
Cavity Mirrors
FM1 (input coupler): A8
    Reply  Fri Aug 16 15:31:17 2013, Koji, Optics, Configuration, Mirror list for OMC(002) 
OMC(002)

Cavity Mirrors

FM1 (input coupler): A9
Entry  Fri Aug 9 10:09:56 2013, Koji, General, General, PZT Assembly #3/#4 PZT_assembly.pdf
Yesterday, Jeff and I bonded the PZT assemblies (#3/#4).
The attached is the arrangement of the components
    Reply  Mon Aug 12 20:22:19 2013, Koji, General, General, PZT Assembly #5/#6 
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.
Entry  Sat Jul 6 17:10:07 2013, Koji, Mechanics, Characterization, PZT Response analysis PZT_Scan.pdfL1OMC_PZT_Response.pdf
Analysis of the PZT scan / TF data taken on May 31st and Jun 1st.
[DC scan]
Each PZT was shaken with 10Vpp 1Hz triangular voltage to the thorlabs amp.
Entry  Fri Jun 28 12:20:49 2013, Koji, General, General, Dmass's loan of Thorlabs HV amp 
http://nodus.ligo.caltech.edu:8080/Cryo_Lab/799
(KA: Returned upon H1OMC building)
Entry  Tue Jun 18 15:45:38 2013, Koji, General, General, [LLO] OMC installation in HAM6 
OMC installed in HAM6!
https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=7486
   
Entry  Tue Jun 18 10:01:11 2013, Koji, Optics, Characterization, Cavity Finesse analysis finesse_measurements.pdf
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.
Entry  Fri Jun 14 06:35:21 2013, Jeff, General, General, [LLO] L1 OMC status preamp_arrangement.png
https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=7410
Weights:
Suspension cage and transportation box: 250.8lb
Entry  Thu Jun 13 12:12:20 2013, Zach, General, General, [LLO] OMC and OMCS in LVEA 
https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=7395
Entry  Thu Jun 13 12:04:57 2013, Koji, General, General, [LLO] OMC Optical Test - completed 
https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=7373
Entry  Mon Jun 10 10:04:37 2013, Koji, General, General, [LLO] OMC Test OMC_pow_cal.pdfresponsivity.pdfOMC_pow_cal_compensated.pdf
[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.
Entry  Fri Jun 7 16:04:44 2013, Koji, General, General, [LLO] OMC arrived 
[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
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!
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