Wed Oct 2 13:38:00 2024, Cynthia, Update, Interferometer Simulations, cavity scan with averaged O4 ETM coating as plume  
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Tue Feb 25 10:56:25 2025, Cynthia, Update, Interferometer Simulations, mirror coating added for simulation rerun
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I have tried to rerun the simulation on finesse after adding the mirror coating. The result has a large fluctuation in required input power vs arm power
that is concerning. I am currently working on potentially resolve this issue and get a reasonable graph before I proceed to optimizing the thermal maps. |
Tue Mar 4 10:18:43 2025, Cynthia, Update, Interferometer Simulations, attempted to remove curvature and tilt for the coating
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Tue Mar 11 11:28:52 2025, Cynthia, Update, Interferometer Simulations, flattening mirror to study power discrepency
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Tue Apr 15 11:37:17 2025, Cynthia, Update, Interferometer Simulations, Finishing up mirror coating map step
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Thu Feb 19 12:34:18 2026, Cynthia, Update, Interferometer Simulations, Point absorber simulation
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Thu Mar 12 12:48:58 2026, Cynthia, Update, Interferometer Simulations, New Result of point absorber+miscentering
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Thu Apr 9 12:50:28 2026, Cynthia, Update, Interferometer Simulations, O5 Test mass
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| https://docs.google.com/presentation/d/1vJPZ9H_umgsZacCLgsqAUZWjn7-6l77np3E_YgaSy_M/edit?usp=sharing |
Thu Apr 16 12:53:30 2026, Cynthia, Update, Interferometer Simulations, O5 Test mass
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Thu Apr 23 12:47:05 2026, Cynthia, Update, Interferometer Simulations, O5 Test mass
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Thu Apr 30 13:23:55 2026, Cynthia, Update, Interferometer Simulations, O5 Test mass
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| frequency locations of 5-8th order mode across arm power of 0-800kW |
Thu May 7 13:35:14 2026, Cynthia, Update, Interferometer Simulations, O5 Test mass
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Thu May 14 12:37:17 2026, Cynthia, Update, Measuring Noise in Interferometer, O5 Test mass design
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Thu May 14 13:42:57 2026, Cynthia, Update, Interferometer Simulations, less-roll-off coating
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Thu May 28 12:54:38 2026, Cynthia, Update, Interferometer Simulations, O5 Test mass
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Thu Jun 4 13:30:46 2026, Cynthia, Update, Interferometer Simulations, O5 Test mass Presentation
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Thu Jun 25 13:45:11 2026, Cynthia, Update, Interferometer Simulations, Poster Draft
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| https://docs.google.com/presentation/d/1tpYjs-gOfZgFFkffU0kv7rYKHu0xtfPyMZqF1qXHIOQ/edit?usp=sharing |
Tue Aug 26 12:45:41 2025, Christina, Ma, Tyler, Update, CDS, RIN Update
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| Slides |
Fri Jun 27 15:38:22 2025, Christina, Update, TCS, FROSTI Reconstruction
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[Tyler, Ma, Christina, Luke]
We threaded the wiring of the heater elements through the reflective surfaces and were able to attach each piece with the Macor spacers and
connect both sides. We used the guide rails and screws to ensure proper alignment. The only necessary step left is to add the additional external screws |
Tue Jul 1 11:04:00 2025, Christina, Update, TCS, FROSTI Reconstruction II
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[Ma, Tyler, Christina]
Finished external reconstruction of the FROSTI by installing all the pins to the 2 DB 25 connectors. To ensure everything
was operating correctly, we did electrical testing by testing continuity and by checking each of the heater elements' RTD and power resistance values and
comparing them to what was tabulated in January. Additionally, we organized the wires and added the stands. |
Mon Jul 7 16:39:18 2025, Christina, Update, TCS, Pomona Box Drawings 
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| Below are the drawings for the pomona box modifications |
Thu Jul 10 16:41:18 2025, Christina, Update, TCS,  
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[Christina, Ma, Tyler]
Pomona Box completed and is now on the server rack in 1119. Additionally, the photodetectors were connected to the
box and set up in front of the heater elements. |
Tue Jul 15 10:40:23 2025, Christina, Update, TCS,
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[Christina, Ma, Tyler]
Yesterday, Ma and I started taking data for the PSD/CSD measurements while the photodetectors and one of the heater
elements are on (8) and are using the Red Pitaya to compare it to the data we took for the same measurements on the CyMAC. It will be finished Wednesday
morning, and then we plan on starting to take additional recordings in order to conduct the same type of comparison for the dark noise measurements. |
Tue Jul 15 13:13:48 2025, Christina, Update, TCS, Photodetector optical post assembly
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Tue Jul 22 12:20:29 2025, Christina, Update, TCS, 
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[Ma, Christina, Tyler]
Figure 1 shows the following PSDs for channels 0-15 from the 14 hour test. Figure 2 shows the reduced chi squared and
CSD plots for both the 2 Hz and 16 Hz resolutions.
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Tue Jul 29 12:30:00 2025, Christina, Update, TCS, 260 hour ADC update
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[Ma, Christina, Tyler]
ADC CyMAC 260 hr, 8192Hz sampling rate channels V3 and Vref6 |
Mon Aug 11 22:19:50 2025, Christina, Update, TCS, Red Pitaya Data Streaming 
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[Ma, Tyler, Christina]
This past week, we were able to set up the data streaming for continuous acquisition to the PCs, and can conduct the initial tests now. We were
able to do this by:
Installing the correct OS ecosystems to each Red Pitaya
Installing the terminal streaming client
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Tue Aug 12 13:46:56 2025, Christina, Update, , 
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Tue Aug 19 12:08:40 2025, Christina, Update, TCS, RP Initial vs CyMAC Plot Comparisons 
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[Tyler, Ma, Christina]
These are the frequency averaged and veto binned plots for the initial Red Pitaya and CyMAC systems. |
Thu Jul 27 10:18:43 2023, Celeste, Update, TCS, Graphical Updates to HOM RH Modification
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| Attached are updated graphs of the irradiance distribution from the 1/8th ring heater units (extruded and reduced in length). |
Fri Jul 28 17:45:45 2023, Celeste, Update, TCS, Graphical Updates to HOM RH Modification, Friday 7/28
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| Updated 1/8th Heater simulation modification graphs. Slides 7, 10, 16-19 are new additions. |
Tue Aug 1 16:22:35 2023, Celeste, Update, TCS, Graphical Updates to HOM RH Modification, Tuesday 8/1
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| Slides 20-33 are newly added (data/graphs from parameter sweep feature-1/8th heater unit length varied from 10% of original to 100% of original). |
Thu Aug 10 14:13:38 2023, Celeste, Update, TCS, 8/10/23, Simulation Graphical Progress
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Fri Aug 11 10:57:20 2023, Celeste, Update, TCS, 8/11/23 Simulation Progress
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Tue Aug 15 16:10:06 2023, Celeste, Update, TCS, 8/15/2023 Simulation Progress
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Tue Jun 3 11:54:06 2025, Cece Ochoa, Update, , CE Cavity Design Update
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| Update on the design for the CE Cavity Mirrors |
Thu Nov 6 12:39:43 2025, Cece Ochoa, Update, ELOG, CE Cavity Design Update 
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| Updated mode placements and ROC. No thermal effects added yet. |
Thu Nov 20 13:03:58 2025, Cece Ochoa, Update, ELOG, CE Cavity Design Update
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| Update on grouping 0+8th Order Modes |
Thu Jan 29 12:46:22 2026, Cece Ochoa, Update, , CE Cavity Design Update (4)
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Update for CE Cavity Arms + Modes
https://docs.google.com/presentation/d/1-dXYylkAbNpHR4WVCx9Q8ryL_xGlH-JSSLXEUQg6b7Q/edit?usp=sharing |
Thu Feb 12 12:53:51 2026, Cece Ochoa, Update, ELOG, CE Cavity Design Update
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Update on HOM placement w/ cavity locking. Still verifying mode placement
RoC: 28340m and 26874m |
Thu Mar 12 13:18:49 2026, Cece Ochoa, Update, Interferometer Simulations, CE Cavity Design Update
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Animation showing how modes shift in the CE arm cavity for radius 27581m and mirror radius of40cm as the laser powers up the 1.5 MW.
https://drive.google.com/file/d/1UNvWmONWYDzroelC5j_Z2emGSotyzcCC/view?usp=sharing |
Thu Apr 23 11:32:48 2026, Cece Ochoa, Update, Interferometer Simulations, CE Cavity Design Update
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Update on CE Mirror RoC, simulation with FROSTI and cavity locking
View Presentation |
Mon Jun 15 22:30:09 2026, Cece Ochoa, Infrastructure, Inventory, Optics Inventory 
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Spreadsheet of all tabletop optical parts in 1129 (Cabinet 1)
linked here
Note that a couple of the optical posts still need to be measured for their diameters. Images are located in a Google Folder and
linked on the spreadsheet so to view them you have to go to the Google Sheet. |
Thu Jul 2 11:09:09 2026, Cece Ochoa, Update, Inventory, PPE/Cleaning Supplies Inventory
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[Shane, Cece]
Shane has made a Google Form to take inventory of PPE
and cleaning supplies.
Additionally, she has made a form for purchase
order requests.
Please use the first form to take inventory when NEW supplies arrive, and in future cleanings use the form to take inventory so |
Thu Jun 25 13:21:31 2026, Cece, Update, Inventory, Optics Inventory Update
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[Shane, Ma, Cece]
Updated optics inventory here.
Changes made: removed thrown out optics from sheet, added new optics found during Ma and Shane's cleaning, updated optics location (now all in 1119 |
Tue Jun 21 18:31:49 2022, Cassidy and Phoebe, Update, Cameras, IR Absorbing Screen and FLIR Camera Setup  
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Today we set up the IR absorbing screen and the camera on the optical table, as well as tested that the camera was functioning as expected (picking up heat
sources beyond the screen).
Screen Setup
The screen was set up by clamping it between two rectangular posts on each side. First, two posts
were set up with 22 in. between them (thus allowing the screen to span a total distance of up to 24 in. when clamped down). To best stabilize the screen |
Tue Jul 26 14:10:35 2022, Cassidy, Update, Cameras, Optical Post Replacement and Realignment  
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Today I replaced the 3" optical post that the camera rests on with a 2" optical post in order for the screen to correctly fill out the camera's FOV. The
3" post is now in the glass optics cabinet next to the FLIR camera configuration box, wrapped in the protective materials from the 2" post for safekeeping.
There were no issues with the physical replacement of the post, except that the fork clamp on the post needs to be on one of the perpendicular, |
Thu Apr 27 16:23:44 2023, Cao, Pamella and Julian, Physics, VAC, Installing vacuum system (cont.) 
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[Pamella, Cao and Julian, Shane]
Particles account
10:37 am: Starting the particles account
Zone 3:
0.3u: 1662
0.5u: 872
1.0u: 415
Zone 4:
0.3u: 831
0.5u: 124
1.0u: 0
11:14 am: Start removal of calibrated leak to install 45 deg elbow
11:21 am: |
Mon Oct 3 17:21:39 2022, Cao, Update, TCS, Inspection of macor parts 7x
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The macor parts arrived and inspected today. These include:
Macor spacer (drawing: LIGO_Redesign_Macor_Spacer_Drawing_v4.pdf
attached below), quantities: 40
No defects, damages observed
Parts are free from grease/ machining fluid
Wall thickness
of 1 mm appear to provide sufficient stiffness to part
Images of parts: Macor_spacer_0.jpg, Macor_spacer_1.jpg
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Tue Apr 11 13:15:40 2023, Cao, Infrastructure, Clean & Bake, Nitrogen gas tank replaced
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The nitrogen gas tank has been replaced with a new unit. The new tank is ultra pure nitrogen (>99.9% nitrogen).
The new tank has been placed and secured
to the rack where the old one is; cap is removed and regulator is reinstalled onto the new tank. |
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