40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  OMC elog, Page 2 of 7  Not logged in ELOG logo
Entry  Tue Apr 23 10:21:12 2019, Joe, Optics, Configuration, Moving the spots to the centre of the curved mirrors FSR_detuned_locking.pdfCM1_IMG_7702.JPGCM2_IMG_7704.JPG
[Koji,Philip, Liyuan, Joe]

CM1:

We moved the curved mirrors to these positions:
Entry  Mon Apr 22 09:54:21 2019, Joe, General, , Shortening cavity (A5,A14,PZT11,PZT22) to get closer to design FSR CM1_IMG_7699.jpgCM2_IMG_7697.jpg
[Koji,Joe,Philip,stephen]

in units 20um per div on the micrometer [n.b. we reailised that its 10um per div on the micrometer]

CM1 inner screw pos: 11.5
    Reply  Mon Apr 22 19:54:28 2019, Koji, General, , OMC(004): Spot positions at the end of Apr 22nd misalignment4.pdf
 
Entry  Sat Apr 20 00:50:12 2019, Koji, Optics, Characterization, OMC(004): Spot positions misalignment2.pdfmisalignment3.pdf
Similarly to OMC ELOG 349 the spot positions after the replacement of CM2 were measured
(Attachment 1)
Also, the spot positions after the realignment were measured. (Attachment 2)
Entry  Thu Apr 18 20:47:54 2019, Joe, Optics, , OMC initial alignment and locking IMG_7676.JPGIMG_7666.JPGIMG_7670.JPGIMG_7883.JPGIMG_7882.JPG
[Joe, Phillip, Koji, Stephen]

*draft post, please add anymore info if I missed something*


made initial alignment of the cavity. To do this we used the periscope mirrors to aim the incoming beam at the centre of the
    Reply  Fri Apr 19 11:34:19 2019, Koji, Optics, , OMC initial alignment and locking misalignment1.pdf
The spot on CM1 was found displaced by 3.4mm (horiz.) and 3.0mm (vert.) in the upper right direction looking from the face side.
The spot on CM2 was found displaced by 1.2mm (horiz.) and 1.8mm (vert.) in the upper left direction looking from the face side.

The drawing on the left side of the attachment shows the estimated misalignment when we think they all come from the curved
Entry  Fri Apr 19 09:35:28 2019, Joe, General, , Adjusting cavity axis, re-alignment of OMC and locking FSR_Scan_Fitfsrdata.pdfIMG_7679_cropped.jpg
[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,
Entry  Fri Apr 19 09:21:07 2019, Philip, Optics, , Cleaning of OMC optics IMG_7877.JPGIMG_7883.JPGIMG_7884.JPG
ach[Joe, Phillip, Koji, Stephen]

Work from 17.04.2019

First contact cleaning of OMC optics
Entry  Wed Apr 17 10:30:37 2019, Philip, Optics, General, OMC optical set-up day 1 
[Joe, Koji, Liyuan, Philip, Stephen]
Work done on 16.04.2019
Entry  Wed Apr 17 09:08:47 2019, Stephen, General, General, OMC(004): Unwrapping and preparing breadboard IMG_7635_packaging_of_sn06.JPGIMG_7637_engraving_of_sn06.JPGIMG_7641_particulate_before_top_gun_large_face.JPGIMG_7644_particulate_before_top_gun_small_face.JPGIMG_7646_particulate_after_top_gun.JPG
[Stephen, Philip, Koji, Joe]

Breadboard D1200105 SN06 was selected as described in eLOG 338. This log describes
unwrapping and preparation of the breadboard.
Entry  Tue Apr 16 23:11:43 2019, Koji, General, General, Borrowed items from the other labs 
Apr 16, 2019
Borrowed two laser goggles from the 40m. (Returned Apr 29, 2019)
Borrowed small isopropanol glass bottole from CTN.
Entry  Mon Apr 15 21:11:49 2019, Philip, Optics, Characterization, OMC(004): PZT testing for spare OMC 
[Koji, Philip]

Today we tested the functionality of the four remaining PZTs (11,12,13 and 22) .  Each PZT was placed within a collimated 500um beam.
Roughly half of the beam was blocked by the PZT. The PZT and a PD then acted as shadow sensor. Each PZT was tested with 0 and
    Reply  Tue Apr 16 11:36:36 2019, Koji, Optics, Characterization, OMC(004): PZT testing for spare OMC 9x
Attachment 1: Shadow sensor setup for the PZT displacement test

Attachment 2: PZT endurance test. 4 PZTs were shaken at once.

Attachment 3~5: Function generator setup 100Hz, 3.5Vpp 1.75Voffset (meant be displayed for 50Ohm load)
    Reply  Tue Apr 16 21:16:11 2019, Koji, Optics, Characterization, OMC(004): PZT testing for spare OMC 
After having dug into the past email, it turned out that these wires were the ones already replaced from the original teflonwires. The length of them
were confirmed to be ~19" (480mm). 




Quote:


Entry  Tue Apr 16 17:24:56 2019, Koji, Optics, Configuration, OMC(004): E Mirror selection E_Mirror_selection.pdf
We are going to use E6, E9, E11, and E14 for BS1, SM1, SM2, and SM3. They (and E18) are all very similar.

The attachment is the excerpt from T1500060 with some highlighting
Entry  Tue Apr 16 16:52:36 2019, Koji, Optics, Configuration, OMC(004): B Mirror selection B_Mirror_selection.pdf
We are going to use B6 for the DCPD BS (BS2), and B1 for the QPD BS (BS3). Their role can not be swapped.

B6 has the best loss among the available ones, while the perpendicularity is not so critical due to the short arm.

B1 has the OK perpendicularity, while the loss is also moderately good.
Entry  Tue Apr 16 16:40:26 2019, Koji, General, Configuration, OMC(004): A Mirror selection A_Mirror_selection.pdf
We are going to use A5 and A14 for FM1 and FM2. (The role of these two can be swapped)

The reason for the selection is the better perpendicularity among the available prisms.

A11 has the best perpendicularity among them. However, the T didn't match with the others. The pair of A5 and A14 has a good matching with
Entry  Tue Apr 16 16:35:09 2019, Koji, Optics, Configuration, OMC(004): Glass breadboard selection BB_selection.pdf
D1200105 SN006 was selected as the breadboard for OMC(004).
The reason is the best parallelism among the unused ones. 

The attached is the excerpt from T1500060 with the #006 highlighted.
Entry  Sun Apr 14 23:58:49 2019, Koji, General, General, OMC(004): PZT sub-assembly post air-bake inspection 
[Koji Stephen]

(Friday afternoon) We retrieved the PZT sub-assemblies to the clean room.

We started removing the ASSYs from the fixtures. We noticed that some part of the glass and PZT are ripped off from the ASSY and stuck with the
    Reply  Mon Apr 15 00:08:32 2019, Koji, General, General, OMC(004): PZT sub-assembly post air-bake inspection (Sub-assy #7) 6x
Sub-ASSY #7

Probably the best glued unit among the four.

Attachment #1: Mounting Block SN001
    Reply  Mon Apr 15 00:39:04 2019, Koji, General, General, OMC(004): PZT sub-assembly post air-bake inspection (Sub-assy #8) 8x
Sub-ASSY #8

Probably the best glued unit among the four.

Attachment #1: Mounting Block SN007
    Reply  Mon Apr 15 01:07:30 2019, Koji, General, General, OMC(004): PZT sub-assembly post air-bake inspection (Sub-assy #9) 7x
Sub-ASSY #9

The most fractured unit among four.

Attachment #1: Mounting Block SN017
    Reply  Mon Apr 15 01:23:45 2019, Koji, General, General, OMC(004): PZT sub-assembly post air-bake inspection (Sub-assy #10)  IMG_7589.jpgIMG_7590.jpgIMG_7591.jpgIMG_7592.jpg
Sub-ASSY #10

Attachment #1: Mounting Block SN021

Attachment #2: PZT-Mounting Block bonding looks just excellent.
Entry  Thu Apr 11 21:22:58 2019, Koji, General, General, OMC(004): PZT sub-assembly air baking temp_profile.pdfbake.xlsx
[Stephen Koji]

The baking of the PZT subassemblies was more complicated than we initially thought.

The four PZT subassemblies were placed in the air bake oven A. We meant to bake the assemblies with the ramp time of 2.5h, a plateau of 2h at
Entry  Thu Apr 11 21:22:26 2019, Koji, Mechanics, General, OMC(004): PZT sub-assembly gluing IMG_7561.jpgIMG_7567.jpg
[Koji Stephen]

The four PZT sub-assemblies were glued in the gluing fixtures. There were two original gluing fixtures and two additional modified fixtures for
the in-situ bonding at the repair of OMC(002).
Entry  Thu Apr 11 12:15:31 2019, Koji, Mechanics, Configuration, PZT sub assy mirror orientations PZT_subassy.pngPZT_subassy.pdf
 
Entry  Wed Apr 10 19:22:24 2019, Koji, General, General, OMC(004): preparation for the PZT subassembly bonding  
Preparation for the PZT subassembly bonding (Section 6.2 and 7.3 of T1500060 (aLIGO OMC optical
testing procedure)
- Gluing fixture (Qty 4)
    Reply  Thu Apr 11 10:54:38 2019, Stephen, General, General, OMC(004): preparation for the PZT subassembly bonding  



Quote:



Preparation for the PZT subassembly bonding (Section 6.2 and 7.3 of T1500060
(aLIGO OMC optical testing procedure)
Entry  Fri Apr 5 23:30:20 2019, Koji, General, General, OMC (002) repair completed P_20190405_222401.jpgP_20190405_222509.jpgP_20190405_222529.jpg
OMC(002) repair completed

When the cable harness of OMC(004) is going to be assembled, the cable harness of OMC(002) will be replaced with the PEEK one. Otherwise, the
work has been done.
Entry  Fri Apr 5 20:50:54 2019, Koji, Optics, Characterization, OMC(002): QPD alignment P_20190405_215906.jpgP_20190405_215927.jpg
QPD#              QPD1       QPD2
Housing#          #004       #008
Diode#            #44        #46
Entry  Fri Apr 5 01:08:17 2019, Koji, Optics, Characterization, OMC(002): DCPD / QPD alignment IMG_7521.JPGIMG_7529.JPGIMG_7539.JPGIMG_7541.JPG
The beam height in the cavity became totally different from the previous one and the shims needed to be much thicker than before. This is probably because
of the alignment of the newly-glue curved mirror.

As the beam height is 2~2.5mm higher, two shims need to be stacked. The preliminary check of the heights using the alignment disks (dummy PDs)
Entry  Fri Apr 5 01:07:18 2019, Koji, Optics, Characterization, OMC(002): transmitted beam images CM1trasns.pngCM2trasns.pngFM2trans2.png
There was a concern that the transmission from CM1 has additional fringes. The shape of the transmitted beams from CM1, CM2, and FM2 (main) werecaptured
with WinCamD.
Indeed CM1 and CM2 have the fringes, but it does not exist in the main transmission. So it seems that the fringes are associated with the curved
Entry  Thu Apr 4 20:07:39 2019, Koji, Supply, General, Purchase 
== Office Depot ==
Really Useful Box 9L x 6 (delivered)
Really Useful Box 17L x 5 (ordered 4/4)
Entry  Thu Mar 28 16:36:52 2019, Koji, Mechanics, Characterization, OMC(002) PZT characterization  PZT_Scan.pdfOMC_PZT_Response.pdf
As performed in the ELOG 202, the PZTs of the OMC 002 were tested.

DC response was measured by sweeping each PZT with 0-150V triangular voltage at 11Hz. Acquire 0.2sec of the tie series using an oscilloscope
to get the PDH error, cavity transmission, and the sweep signal.
Entry  Tue Mar 19 17:30:25 2019, Koji, General, Characterization, OMC (002) Test items 
OMC #002 Optical tests


FSR measurement (done, 2019/1/8-9, 2019/4/1)
TMS measurement
(done, 2019/1/9)
TMS measurement (with DC voltage on PZTs) (done, 2019/1/10)
Cleaning
Entry  Sat Feb 2 20:35:02 2019, Koji, Optics, Characterization, Summary: OMC(002) HOM structure recalculation (after mirror replacement)  OMC_HOM_190110.pdfHOM_PZTV.pdfHOM_plot_PZT0_0.pdfCav_scan_response_PZT.pdf
OMC (002) after repair
History:Mirror replacement after the damage at H1. Measurement date 2019/1/10
Entry  Sat Feb 2 20:28:21 2019, Koji, Optics, Characterization, Summary: OMC(003) HOM structure recalculation OMC_HOM_140705.pdfHOM_PZTV_PZT1_0V.pdfHOM_plot_PZT0_0.pdfCav_scan_response_PZT_HOM.pdf
OMC (003)
History: Measurement date 2014/7/5, Stored for I1, Installed to H1 2016/8 upon damage on 002
Entry  Sat Feb 2 20:03:19 2019, Koji, Optics, Characterization, Summary: OMC(002) HOM structure recalculation (before mirror replacement) OMC_HOM_131011.pdfHOM_PZTV.pdfHOM_plot_PZT0_0.pdfCav_scan_response_PZT_HOM.pdf
OMC (002)
History: Measurement date 2013/10/11, Installed to L1 2013/XX
Entry  Sat Feb 2 16:17:13 2019, Koji, Optics, Characterization, Summary: OMC(001) HOM structure recalculation OMC_HOM_130531.pdfHOM_PZTV.pdfHOM_plot_PZT0_0.pdfCav_scan_response_HOM.pdf
Each peak of the transfer function measurement was fitted again with a complex function:

Entry  Fri Feb 1 12:52:12 2019, Koji, Mechanics, General, PZT deformation simulation pzt.png
A simple COMSOL simulation was run to see how the PZT deforms as the voltage applied.

Use the geometry of the ring PZT which is used in the OMCs -  NAC2124 (OD 15mm, ID 9mm, H 2mm)
The material is PZT-5H (https://bostonpiezooptics.com/ceramic-materials-pzt) which
Entry  Sat Jan 12 22:49:11 2019, Koji, Optics, Characterization, PM-SM patch cable mode cleaning effect fiber_mode_cleaning.pdf
Mode cleaning capability of an optical fiber was measured. The conclusion is that the
leakage of the non-fiber mode to the fiber output is insignificant and also practically negligible.

The tested fiber was Thorlabs 5-m Polarization Maintaining Single-Mode fiber (P3-1064PM-FC-5, PM Patch Cable, PANDA, 1064 nm, FC/APC, 5m).
Entry  Thu Jan 10 20:45:00 2019, Koji, Optics, Characterization, PZT test cable OMC_PZT_wiring.pdf
As OMC SN002 already has the PZTs connected to the Mighty-Mouse connector, a test cable with a female mighty-mouse connector was made.

A small imperfection: When the cable was inserted to the connector shell, I forgot to mirror the pin out. Therefore the color and pin number
do not match.
Entry  Thu Jan 10 20:42:54 2019, Koji, Optics, Characterization, FSR / HOM Test of OMC SN002 
OMC SN002 = Former LHO OMC which CM1 was destroyed by the lock loss pulse in 2016. This OMC needs to be optically tested before storage.

The test items:


[done] FSR measurement with offset PDH locking (FM->AM conversion)
[done] FSR/finesse
Entry  Sun Sep 23 19:42:21 2018, Koji, Optics, General, Montecarlo simulation of the phase difference between P and S pols for a modeled HR mirror reflectivities.pngtransmission.pngphase_diff.pngphase_difference_histogram.png
[Koji Gautam]


With Gautam's help, I ran a coating design code for an HR mirror with the standard quarter-wave design. The design used
here has 17 pairs of lambda/4 layers of SiO2 and Ta2O5 (=34 layers) with the fused silica as the substrate to realize
    Reply  Thu Sep 27 20:19:15 2018, Aaron, Optics, General, Montecarlo simulation of the phase difference between P and S pols for a modeled HR mirror 
I started some analytic calculations of how OMC mirror motion would add to the noise in the BHD. I want to make some prettier plots, and am adding the
interferometer so I can also compute the noise due to backscatter into the IFO. However, since I've pushed the notebook I wanted to post an update.
Here's
       Reply  Thu Nov 1 19:57:32 2018, Aaron, Optics, General, Montecarlo simulation of the phase difference between P and S pols for a modeled HR mirror 
I'm still not satisfied/done with the solution to this, but this has gone too long without an update and anyway probably someone else will have a
direction to take it that prevents me spinning my wheels on solved or basic questions.

The story will have to wait to be on the elog, but I've put it in the jupyter notebook. Basically:
Entry  Wed Aug 29 11:06:30 2018, Koji, General, General, RF AM RIN and dBc conversion 
0. If you have an RF signal whose waveform is , the amplitude is constant and 1.

1. If the waveform 
Entry  Wed Aug 8 17:32:56 2018, Rich Abbott, General, Characterization, Modulation Index Test Setup at 40m Lab 40mLabModIndexSetup.pdf
Attached is a block diagram of the test setup used in the 40m lab to measure the modulation index of the IO modulator
    Reply  Thu Aug 9 11:24:29 2018, Koji, General, Characterization, Modulation Index Test Setup at 40m Lab modulation_depth.pdfmodulation_depth_zoom.pdf
[Rich Koji]

The impedances of the new LLO EOM were measured with the beat note setup at the 40m PSL (as described in the previous ELOG entry.

At the target frequencies (9.1MHz, 24.1MHz, 45.5MHz, 118.3MHz), the modulation responses were (0.09, 2.9e-3, 0.053, 0.021) rad/V.
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  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  Mon Jul 2 11:30:22 2018, Koji, Electronics, Characterization, 3IFO EOM impedance measurement impedance_eom.pdfEOM_Z_DATA.zip
[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.
    Reply  Wed Jul 4 18:30:51 2018, Koji, Electronics, Characterization, EOM circuit models eom_models.pdfeom9.pdfeom24.pdfeom45.pdf180704_3IFO_EOM_model.zip
The circuit models for the 3IFO EOM (before mods) were made using LISO.
Then the modification plan was made to make it a new LLO EOM.

Impedance data, LISO model, Mathematica files are zipped and attached at the end.
Entry  Tue Jul 3 12:07:47 2018, Rich Abbott, Electronics, Characterization, Notes on 3rd IFO EOM EOM_Analysis2.pdf
Attached please see my notes summarizing the models for the electrodes and inductors within the 3rd IFO EOM
Entry  Mon Jul 2 15:27:31 2018, Rich Abbott, Electronics, General, Work on EOM (3rd IFO unit) EOM3_aLIGO_3rdIfo.JPG
Koji, Rich

We took apart the unit removed from the 3rd IFO (Unit serial number aLIGO #3, XTAL 10252004) to see what makes it tick.  Koji has done a
fine job of adding the plots of the impedance data to this log book.  Attached are some details of the physical construction showing the capacitor
Entry  Mon Jul 2 12:29:01 2018, Koji, Electronics, Characterization, Impedances of individual components (3IFO EOM) impedance_coils.pdfimpedance_xtals.pdfq_coils.pdfcomponent_models.pdfliso_models.zip
[Rich Koji]

The impedances of the individual components from the 3IFO EOM (before modification) were tested.
Each component was modeled by LISO. The LISO model (in PDF and txt) are attached at the end of the entry.
Entry  Wed May 30 17:44:23 2018, Koji, Optics, Characterization, 3IFO EOM surface check IMG_5756.JPGIMG_5757.JPGIMG_5758.JPGIMG_5759.JPGLooking_at_Hole2.png
3IFO EOM dark microscope images courtesy by GariLynn and Rich

Attachment1/2: Hole #1
Attachment3/4: Hole #2
Entry  Wed May 30 16:40:38 2018, Koji, Mechanics, Characterization, EOM mount stability test 
https://awiki.ligo-wa.caltech.edu/wiki/EOM_Mount_Stability
Entry  Tue May 15 19:53:45 2018, Koji, Optics, General, EOM Q comparison 
Qs' were estimated with a lorentzian function (eye fit)



Current LHO EOM (final version, modulation depth measurement 2018/4/5)
Entry  Sat May 5 22:51:04 2018, Koji, Optics, General, 3IFO EOM Optical test 
The 3IFO EOM test performed at the 40m. Result: 40m ELOG 13819
Entry  Thu May 3 21:45:58 2018, awade, General, Loan / Lending, Borrowed toaster oven 9CE80545-7A58-4236-B7E3-1EE6C4042DAA.jpeg
I’ve borrowed the black and decker toaster oven to dry some sonicated parts. It is temporarly located in the QIL lab. 
Entry  Thu Feb 22 20:21:02 2018, Koji, Optics, Characterization, aLIGO EOM test 
POSTED to 40m ELOG
    Reply  Mon Apr 2 17:27:04 2018, Koji, Optics, Characterization, aLIGO EOM test 
2nd optical test http://nodus.ligo.caltech.edu:8080/40m/13725
Entry  Thu Nov 30 12:18:41 2017, Stephen, General, General, Preparation for Modal Testing on 4 December 
Norna Robertson, Stephen Appert ||  29 Nov 2017, 2 pm to 4 pm  ||  227 Downs, CIT

We made some preparations for modal testing, but did not have enough time to make measurements. Below is an after-the-fact log, including some
observations and photos of the current state of the OMC bench.
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