 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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Mon Apr 15 21:11:49 2019, Philip, Optics, Characterization, OMC(004): PZT testing for spare OMC
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[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 |
 Tue Apr 16 11:36:36 2019, Koji, Optics, Characterization, OMC(004): PZT testing for spare OMC 9x
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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) |
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Tue Apr 16 21:16:11 2019, Koji, Optics, Characterization, OMC(004): PZT testing for spare OMC
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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:
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Tue Apr 16 17:24:56 2019, Koji, Optics, Configuration, OMC(004): E Mirror selection
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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 |
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Tue Apr 16 16:52:36 2019, Koji, Optics, Configuration, OMC(004): B Mirror selection
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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. |
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Tue Apr 16 16:40:26 2019, Koji, General, Configuration, OMC(004): A Mirror selection
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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 |
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Tue Apr 16 16:35:09 2019, Koji, Optics, Configuration, OMC(004): Glass breadboard selection
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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. |
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Sun Apr 14 23:58:49 2019, Koji, General, General, OMC(004): PZT sub-assembly post air-bake inspection
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[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 |
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Mon Apr 15 00:08:32 2019, Koji, General, General, OMC(004): PZT sub-assembly post air-bake inspection (Sub-assy #7) 6x
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Sub-ASSY #7
Probably the best glued unit among the four.
Attachment #1: Mounting Block SN001 |
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Mon Apr 15 00:39:04 2019, Koji, General, General, OMC(004): PZT sub-assembly post air-bake inspection (Sub-assy #8) 8x
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Sub-ASSY #8
Probably the best glued unit among the four.
Attachment #1: Mounting Block SN007 |
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Mon Apr 15 01:07:30 2019, Koji, General, General, OMC(004): PZT sub-assembly post air-bake inspection (Sub-assy #9) 7x
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Sub-ASSY #9
The most fractured unit among four.
Attachment #1: Mounting Block SN017 |
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Mon Apr 15 01:23:45 2019, Koji, General, General, OMC(004): PZT sub-assembly post air-bake inspection (Sub-assy #10)
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Sub-ASSY #10
Attachment #1: Mounting Block SN021
Attachment #2: PZT-Mounting Block bonding looks just excellent. |
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Thu Apr 11 21:22:58 2019, Koji, General, General, OMC(004): PZT sub-assembly air baking
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[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 |
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Thu Apr 11 21:22:26 2019, Koji, Mechanics, General, OMC(004): PZT sub-assembly gluing
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[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). |
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Thu Apr 11 12:15:31 2019, Koji, Mechanics, Configuration, PZT sub assy mirror orientations
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| |
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Wed Apr 10 19:22:24 2019, Koji, General, General, OMC(004): preparation for the PZT subassembly bonding
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Preparation for the PZT subassembly bonding (Section 6.2 and 7.3 of T1500060 (aLIGO OMC optical
testing procedure)
- Gluing fixture (Qty 4) |
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Thu Apr 11 10:54:38 2019, Stephen, General, General, OMC(004): preparation for the PZT subassembly bonding
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Quote:
Preparation for the PZT subassembly bonding (Section 6.2 and 7.3 of T1500060
(aLIGO OMC optical testing procedure) |
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Fri Apr 5 23:30:20 2019, Koji, General, General, OMC (002) repair completed
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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. |
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Fri Apr 5 20:50:54 2019, Koji, Optics, Characterization, OMC(002): QPD alignment
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QPD# QPD1 QPD2
Housing# #004 #008
Diode# #44 #46 |
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Fri Apr 5 01:08:17 2019, Koji, Optics, Characterization, OMC(002): DCPD / QPD alignment
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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) |
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Fri Apr 5 01:07:18 2019, Koji, Optics, Characterization, OMC(002): transmitted beam images
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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 |
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Thu Apr 4 20:07:39 2019, Koji, Supply, General, Purchase
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== Office Depot ==
Really Useful Box 9L x 6 (delivered)
Really Useful Box 17L x 5 (ordered 4/4) |
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Thu Mar 28 16:36:52 2019, Koji, Mechanics, Characterization, OMC(002) PZT characterization
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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. |
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Tue Mar 19 17:30:25 2019, Koji, General, Characterization, OMC (002) Test items
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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 |
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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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Sat Feb 2 20:28:21 2019, Koji, Optics, Characterization, Summary: OMC(003) HOM structure recalculation
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OMC (003)
History: Measurement date 2014/7/5, Stored for I1, Installed to H1 2016/8 upon damage on 002 |
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Sat Feb 2 20:03:19 2019, Koji, Optics, Characterization, Summary: OMC(002) HOM structure recalculation (before mirror replacement)
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OMC (002)
History: Measurement date 2013/10/11, Installed to L1 2013/XX |
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Sat Feb 2 16:17:13 2019, Koji, Optics, Characterization, Summary: OMC(001) HOM structure recalculation
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Each peak of the transfer function measurement was fitted again with a complex function:
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Fri Feb 1 12:52:12 2019, Koji, Mechanics, General, PZT deformation simulation
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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 |
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Sat Jan 12 22:49:11 2019, Koji, Optics, Characterization, PM-SM patch cable mode cleaning effect
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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). |
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Thu Jan 10 20:45:00 2019, Koji, Optics, Characterization, PZT test cable
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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. |
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Thu Jan 10 20:42:54 2019, Koji, Optics, Characterization, FSR / HOM Test of OMC SN002
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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 |
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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
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[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 |
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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
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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 |
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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
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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: |
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Wed Aug 29 11:06:30 2018, Koji, General, General, RF AM RIN and dBc conversion
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0. If you have an RF signal whose waveform is , the amplitude is constant and 1.
1. If the waveform |
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Wed Aug 8 17:32:56 2018, Rich Abbott, General, Characterization, Modulation Index Test Setup at 40m Lab
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| Attached is a block diagram of the test setup used in the 40m lab to measure the modulation index of the IO modulator |
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Thu Aug 9 11:24:29 2018, Koji, General, Characterization, Modulation Index Test Setup at 40m Lab
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[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. |
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Tue Aug 7 15:43:12 2018, Koji, Electronics, Characterization, New LLO EOM stuffed
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[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. |
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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 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 Jul 4 18:30:51 2018, Koji, Electronics, Characterization, EOM circuit models
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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. |
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Tue Jul 3 12:07:47 2018, Rich Abbott, Electronics, Characterization, Notes on 3rd IFO EOM
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| Attached please see my notes summarizing the models for the electrodes and inductors within the 3rd IFO EOM |
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Mon Jul 2 15:27:31 2018, Rich Abbott, Electronics, General, Work on EOM (3rd IFO unit)
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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 |
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Mon Jul 2 12:29:01 2018, Koji, Electronics, Characterization, Impedances of individual components (3IFO EOM)
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[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. |
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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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Wed May 30 16:40:38 2018, Koji, Mechanics, Characterization, EOM mount stability test
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| https://awiki.ligo-wa.caltech.edu/wiki/EOM_Mount_Stability |
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Tue May 15 19:53:45 2018, Koji, Optics, General, EOM Q comparison
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Qs' were estimated with a lorentzian function (eye fit)
Current LHO EOM (final version, modulation depth measurement 2018/4/5) |
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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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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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Thu Feb 22 20:21:02 2018, Koji, Optics, Characterization, aLIGO EOM test
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| POSTED to 40m ELOG |
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Mon Apr 2 17:27:04 2018, Koji, Optics, Characterization, aLIGO EOM test
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| 2nd optical test http://nodus.ligo.caltech.edu:8080/40m/13725 |
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Thu Nov 30 12:18:41 2017, Stephen, General, General, Preparation for Modal Testing on 4 December
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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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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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Fri Sep 8 15:14:05 2017, Koji, Facility, General, Preparation for the plumbing work 7x
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[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. |
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Tue Mar 28 21:04:27 2017, Koji, Electronics, Characterization, PDH amp 6x
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Attachment 1: PDH amp RF part (before the preamp was installed)
Attachment 2: RF-AF transmission
Attachment 3: Attachment 3: LO dependence |
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Sat Jul 29 18:44:38 2017, rana, Electronics, Characterization, PDH amp
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| attachment 6: DCPD preamp looks like the opamp is wired for positive feedback? |
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Sat Jul 29 21:42:51 2017, Koji, Electronics, Characterization, PDH amp
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| The polarities indicated in the right circuits were opposite, obviously. |
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Wed Jul 5 16:59:44 2017, Koji, General, General, The OMC #002 was packed
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[Stephen Koji]
The OMC #002 was packed for the transportation to Downs.
===> And transported to Downs 227 on Jul 6th. |
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Sat Jul 1 21:33:18 2017, Koji, General, General, Some purchase notes
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- Forgot to close the cylinder valve...
v HEPA prefilter (20"x20"x1" MERV 7)
- Replace the filter for the air conditioning |
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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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Fri Jun 23 10:55:07 2017, Koji, Optics, General, Dust layer on black glass beam dumps?
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I wondered why the black glass beam dumps looked not as shiny as before. It was in fact a layer of dusts (or contaminants) accumulated on the surface.
The top part of the internal surface of the black glass was touched by a piece of lens tissue with IPA. The outer surface was already cleaned. IPA
did not work well i.e. Required multiple times of wiping. I tried FirstContact on one of the outer surface and it efficiently worked. So I think the internal |
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Fri Jun 23 01:58:11 2017, Koji, Optics, General, OMC #002 Repair - CM1 gluing 6x
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[Alena, Koji]
Jun 21: Alena and Koji worked on gluing of the CM1 mirror on the OMC breadboard #002. This
is an irregular procedure. Usually, the PZT mirror subassembly is prepared before the mounting prism is glued on the breadboard. In this |