 Tue Apr 5 18:14:55 2016, Koji, General, Loan / Lending, QPD Lending Crackle
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Xiaoyue
QPD head
X-Z stage |
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Fri Jun 10 17:12:57 2016, Koji, General, Configuration, L1 OMC DCPD replacement
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New DCPD(T) = A1-23
DCPD(T) = DCPDB: extracted and accomodated in CAGE-G SLOT1
New DCPD(R) = A1-25 |
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Fri Jul 22 22:24:05 2016, Koji, General, General, HQEPD inventory
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As of Jul 22, 2016
As of Aug 11, 2016
As of Aug 16, 2016 |
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Fri Aug 12 14:58:17 2016, Koji, General, Configuration, H1 OMC DCPD replacement
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Preparation of 3rd OMC for the use in H1
New DCPD(T) = B1-01
DCPD(T) = DCPDA: extracted and accomodated in CAGE-A SLOT1 |
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Mon Aug 15 10:09:10 2016, Koji, General, General, Prev H1 OMC shipped to CIT
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Previous H1 OMC shipped from LHO to CIT
https://ics-redux.ligo-la.caltech.edu/JIRA/browse/Shipment-8196 |
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Mon Aug 22 12:58:16 2016, Koji, General, General, UV bond samples -> Garilynn
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- FS base + Mounting Prism
- FS or SF2 1/2" piece + FS or SF2 1/2" piece
- FS? plate + FS or SF2 1/2" piece + FS or SF2 1/2" piece + FS? plate |
 Fri Sep 9 14:34:31 2016, Koji, General, General, Item lending
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To 40m
First Contact Kit by Calum
Class A Kapton sheets |
Wed Dec 7 21:18:35 2016, Koji, General, General, OMC placed on the table / the beam roughly aligned 
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The OMC mode matching sled was fixed on the nominal part of the table. Then the OMC was located at the nominal position marked by three poles.
The input periscope was adjusted to have the input beam roughtly centered on the OMC QPDs. This made the beam from FM2 aligned to the missing
CM1, and the beam just went through the hole of the mounting prism. Very promising! |
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Thu Dec 8 21:17:09 2016, Koji, General, General, OMC placed on the table / the beam roughly aligned
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The OMC cavity was locked. The alignment was precisely adjusted. The mode matching was optimized by the lens positions. The reflection during the lock
is ~0.01 compared to the full reflection on non-resonance, meaning the mode matching is ~99%. The error signal was maximized (i.e. demod pahse was adjusted)
by sweeping the modulation frequency. Note that the EOM is broad band. The modulation freq chosen today was 34.6MHz. |
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Fri May 26 21:53:20 2017, Koji, General, Configuration, Trans RF PD setup
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Recent work
- DC output of the trans RF PD was connected to the BNC patch panel. => Now CH4 of the scope is monitoring this signal
- The RF sweep signal from the network analyzer is connected to the power combiner for the EOM drive via the SMA patch panel. |
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Tue Jun 6 00:49:48 2017, Koji, General, Configuration, Trans RF PD setup
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Last week, I further worked on the RF system to install 20dB coupler on the agilent unit and setup the R channel. This allowed me to make the FSR/TMS
measurement of the OMC.
And today several optical improvement has been done. |
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Tue Jun 6 22:00:36 2017, Koji, General, Configuration, Trans RF PD setup
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- Replaced the PZT with the one used from the beginning. This must be PZT #21. After the replacement, the spot positions look very good. I even went
up. So I decided this is the configuration to proceed to the gluing. The CM1 mirror has the HR arrow at the top.
- The input beam was realigned w.r.t. the OMC. |
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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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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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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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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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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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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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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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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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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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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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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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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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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 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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Wed Apr 17 09:08:47 2019, Stephen, General, General, OMC(004): Unwrapping and preparing breadboard
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[Stephen, Philip, Koji, Joe]
Breadboard D1200105 SN06 was selected as described in eLOG 338. This log describes
unwrapping and preparation of the breadboard. |
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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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Mon Apr 22 09:54:21 2019, Joe, General, , Shortening cavity (A5,A14,PZT11,PZT22) to get closer to design FSR
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[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 |
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Mon Apr 22 19:54:28 2019, Koji, General, , OMC(004): Spot positions at the end of Apr 22nd
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Thu May 16 12:41:28 2019, Chub, General, General, fire pillow found on optics table
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That is an expanding fire pillow, also known as firebrick. It is used to create a fire block where holes in fire-rated walls are made and prevents
lab fires from spreading rapidly to adjacent labs. I had to pull cable from B254 to our labs on either side during a rather narrow window of time.
Some of the cable holes are partially blocked, making it difficult to reach the cable to them. The cable is then just guided to the hole from a distance. |
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Wed Sep 18 23:38:52 2019, Stephen, General, General, Dirty ABO ready for 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, so I have had to play
with the tuning and parameters to recover a suitable bake profile. This bake is pictured below (please excuse the default excel formatting).
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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). |
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Thu Sep 26 17:33:52 2019, Stephen, General, General, Dirty ABO test run prior to PZT Subassembly Bonding - ABO is Ready!
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Follow up on OMC elog 379
I was able to obtain the following (dark blue) bake profile, which I believe is adequate for our needs.
The primary change was a remounting of the thermocouple to sandwich it between two stainless steel masses. The thermocouple bead previously was |
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Tue Oct 22 10:25:01 2019, Stephen, General, General, OMC PZT Assy #9 and #10 Production Cure Bake
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OMC PZT Assy Production Cure Bake (ref. OMC elog 381) for PZT Assy #9 and #10 started 27
September 2019 and completed 28 September 2019. Captured in the below figure (purple trace). Raw data has been posted as an attachment as well.
We have monitored the temperature in two ways: |
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Tue Oct 22 11:52:53 2019, Stephen, General, General, Epoxy Curing Timeline of OMC PZT Assy #9 and #10
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This post captures the curing timeline followed by OMC PZT Assys #9 and #10.
Source file posted in case any updates or edits need to be made. |
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Fri Dec 13 14:59:18 2019, Stephen, General, General, OMC Beam Dump Production Cure Bake
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[Koji, Jordan, Stephen]
The beam dumps, bonded on Fri 06 Dec 2019, were placed in the newly tuned and configured small dirty ABO at the Bake Lab on Fri 13 Dec 2019.
Images are shared and references are linked below |
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Wed Dec 18 21:54:53 2019, Koji, General, General, OMC Beam Dump Production Cure Bake
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The beamdumps were taken out from the oven and packed in bags.
The bottom of the V are completely "wet" for 17 BDs among 20 (Attachment 1/2).
3 BDs showed insufficient glue or delamination although there is no sign of lack of rigidity. They were separated from the others in the pack. |
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Thu Feb 27 14:31:13 2020, Koji, General, General, Item lending
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Item lending as per Ian's request: Particle Counter from OMC Lab to QIL
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Mon Aug 10 15:29:54 2020, Koji, General, General, Item lending
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The particle counter came back to the OMC lab on Aug 10, 2020
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Mon Aug 10 15:53:46 2020, Koji, General, General, Lab status check
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Check-in to the OMC lab to see the status. Nothing seemed changed. No bug. The HEPA is running normal. The particle level was 0.
Went into the HEPA enclosure and put a cover on the OMC. Because of the gluing template, the lid could not be close completely (that's expected
and fine). |
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Mon Sep 28 16:03:13 2020, rana, General, General, OMC Beam Dump Production Cure Bake
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are there any measurements of the BRDF of these things? I'm curious how much light is backscattered into the incoming beam and how much goes
out into the world.
Maybe we can take some camera images of the cleaned ones or send 1-2 samples to Josh. No urgency, just curiosity. |
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Mon Sep 28 16:13:08 2020, Koji, General, General, OMC Beam Dump Production Cure Bake
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According to the past backscatter test of the OMC (and the black glass beamdump: not V type but triangular type on a hexagonal-mount), the upper limit
of the back reflection was 0.13ppm. https://nodus.ligo.caltech.edu:8081/OMC_Lab/209
I don't have a BRDF measurement. We can send a few black glass pieces to Josh. |
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Thu Oct 8 19:55:22 2020, Koji, General, Characterization, Power Measurement of Mephisto 800NE 1166A
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The output of Mephisto 800NE (former TNI laser) was measured.
The output power was measured with Thorlabs sensors (S401C and S144C). The reference output record on the chassis says the output was 837mW at 2.1A
injection. |