 Thu Jul 16 13:14:26 2026, Cynthia, Update, Interferometer Simulations, LIGO pre-figuring team meeting summary
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Pre-figuring meeting 7/14:
- the non-uniformity brought by annealing for ETM14 and 11 seems to be higher than expected, this meeting focused
on discussing about annealing data for ETM014 and 11 : https://dcc-lho.ligo.org/LIGO-T2600213
-we will receive more data for these, since
there are some residual power left in the data/plots shown in the meeting because of the reference sphere, and the exact reference sphere radius is unclear
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Thu Jul 16 10:52:02 2026, Joshua, Update, General, HBT SURF Update #3 - group meeting slides 
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Thu Jul 16 10:29:19 2026, Joshua, Update, General, HBT SURF Update #3
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[Joshua, Mary, Ma, Abhi]
On Wednesday (7/15), the particle count measurement was sufficient, so the FROSTI was transferred into the cleanroom. We unmounted it from
the plastic base, and secured it to the optical table. We also transferred the neccessary parts for the HBT setup and began assembly. The breadboard was |
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Wed Jul 15 21:53:32 2026, Joshua, Infrastructure, Cleanroom, Cleanroom cleaning
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[Joshua, Mary, Ma]
On Wednesday (7/15), a particle count measurement was performed in the clean room in all five zones.
Particle Count Measurements: |
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Tue Jul 14 21:23:40 2026, Xuesi, Infrastructure, Cleanroom, Cleanroom cleaning
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[Joshua, Cece, Ma, Mary, Abhi, Jacob, Dhatri]
The clean room (1119) was re-cleaned on Tuesday (7/14). A particle count measurement was performed on zones 1, 3, and 5. We noticed the burning
smell again in 1129. As a precaution, we closed the two doors separating the three rooms.
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Thu Jul 9 13:35:08 2026, Mary, Update, Interferometer Simulations,
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Thu Jul 9 12:46:49 2026, Xuesi Ma, Infrastructure, Cleanroom, Cleanroom cleaning
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[Shane, Joshua, Cece, Ma, Mary, Abhi, Jacob]
The clean room (1119) was re-cleaned on Tuesday (7/7). All surfaces were wiped down, and the wire rack was rewiped. A particle count measurement
was performed on zone 1.
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Thu Jul 9 12:27:20 2026, Joshua Marmor, Update, General, Week 2 HBT Surf Project
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| Slides for group meeting, updates on HBT measurement |
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Thu Jul 9 12:13:02 2026, Abhiram Sharma, Update, Interferometer Simulations,
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| Update on MCMC SURF project |
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Tue Jul 7 13:54:37 2026, Xuesi Ma, Infrastructure, Cleanroom,
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[Shane, Joshua, Cece, Ma, Mary, Abhi, Jacob]
The clean room (1119) was re-cleaned on Thursday (7/2). All surfaces were wiped down, the floor was vacuumed and mopped, and new sticky mats
were installed.
Additionally, a particle count measurement was performed on Monday (7/6) after allowing sufficient time for dust to settle. As this is |
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Mon Jul 6 18:25:26 2026, shane, Update, Inventory, Cleaning/PPE inventory
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The cleaning supply/PPE inventory has now been fully updated and the spreadsheet can be viewed here.
Any future additions to the lab inventory and new supplies should be added by filling out this
form, which will auto-add to the spreadsheet to keep things neat.
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Thu Jul 2 14:46:19 2026, Xuesi, Update, , FROSTI Reflector Design
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Update on the FROSTI reflector design
slides |
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Thu Jul 2 13:27:48 2026, Joshua Marmor, Update, General, HBT SURF Update #1
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| Update on the progress for the HBT measurement. |
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Thu Jul 2 13:26:16 2026, Abhiram Sharma, Update, Interferometer Simulations,
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| Update on MCMC SURF project |
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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 |
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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 |
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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 |
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Thu Jun 25 12:48:29 2026, Xuesi Ma, Infrastructure, Cleanroom,
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Thu Jun 25 11:42:29 2026, Mary, Update, TCS, Beam position optimization algorithm
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Weight Calibration: this study looks at how the thermal-compensation system should be tuned as the laser beam moves off-center
on a detector mirror, with a fixed point-absorber defect in place. The optimizer that sets the actuator powers tries to flatten the wavefront, and it balances |
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Thu Jun 18 12:36:46 2026, Mary, Update, , Beam position optimization algorithm
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| Slides |
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Thu Jun 18 08:40:07 2026, Mary, Infrastructure, General, Fume hood
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[Ma, Mary]
The tape residue on the fume hood was cleaned using acetone; however, the acetone caused minor paint removal. Few areas with rust were also found,
including inside both side cabinets. under the fume hood. |
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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. |
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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 4 11:21:29 2026, Mary, Update, VAC, Vacuum design
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| https://autode.sk/43S0ZbK |
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Thu May 28 12:54:38 2026, Cynthia, Update, Interferometer Simulations, O5 Test mass
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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 14 12:37:17 2026, Cynthia, Update, Measuring Noise in Interferometer, O5 Test mass design
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Thu May 7 13:35:14 2026, Cynthia, Update, Interferometer Simulations, O5 Test mass
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Fri Apr 24 23:55:50 2026, Dhatri, Summary, Interferometer Simulations,
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| [Sidd, Pooyan, Dhatri] In the group meeting on 04/23/26, we discussed with Jon why we weren’t getting expected values for PRC Gain while running the current LLO model; specifically |
 Tue May 5 14:13:45 2026, Dhatri, Summary, Interferometer Simulations, Mode mismatch
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[Pooyan, Tyler, Ceci, Dhatri]
Attached are the plots generated by running the newer code here for input power of 2W: run.py
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Tue May 5 12:58:53 2026, Tyler, Update, TCS, FROSTI A# Profiles 05/07/2026 Group Meeting
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Slides detailing the incorporation of minimizing
curvature overlap between FROSTI and ring heater actuation profiles. |
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Sun May 3 21:13:14 2026, Pooyan, Infrastructure, Cleanroom, Cleanroom HEPA fan install
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[Ma, Cece, Pooyan, Tyler]
We installed the repaired HEPA fans on top of the cleanroom, and cleaned the fans themselves. The table of all the Serial Numbers for the fans,
filters, and where they are installed is added for the record. |
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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 |
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Thu Apr 30 12:52:26 2026, Mary, Update, Interferometer Simulations, Full interferometer simulation
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Thu Apr 30 12:08:02 2026, Mary, Update, VAC, New Vacuum design
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| https://autode.sk/3QFUGF8 |
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Thu Apr 23 12:47:05 2026, Cynthia, Update, Interferometer Simulations, O5 Test mass
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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 |
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Sun Apr 19 15:22:08 2026, Pooyan, Infrastructure, Cleanroom, HEPA fan air flow measurment
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[Ma, Mary, Tyler, Pooyan]
HEPA fan air flow measurements are done with the fans sitting on their side in the lab, and the anemometer being 24in away from the filter face
of the fan. Per company's documents, we need to replace the filter if the air flow velocity drops under 38-45 fpm for the medium settings.) |
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Thu Apr 16 14:04:46 2026, Mary, Update, Interferometer Simulations, Beam position optimization algorithm
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Thu Jan 15 12:52:58 2026, Tyler, Update, TCS, A# FROSTI Profiles 01/15/26
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| Slides |
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Wed Jan 28 11:29:30 2026, Tyler, Update, TCS, A# FROSTI Profiles 01/15/26
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Quote:
Slides
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Thu Feb 5 13:12:28 2026, Tyler, Update, TCS, A# FROSTI Profiles 01/15/26
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Slides updating progress on FROSTI
A# irradiance profiles and reflector design. Edge roll-off is now included for thermoelastic deformation corrections.
Quote:
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Thu Feb 19 12:59:47 2026, Tyler, Update, TCS, A# FROSTI Profiles 01/15/26
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Slides covering a new approach
to optimizing for A# FROSTI profiles. In particular, we start looking at just optimal RH correction. Once this profile is determined, we then minimize
the residual further with FROSTI profiles.
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Thu Mar 5 13:01:14 2026, Tyler, Update, TCS, A# FROSTI Profiles Optimization
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Slides
discussing updates on FROSTI A# profile optimizations. In particular, a new RMS function is defined which reduces inner-radii wavefront error variation
to a greater degree.
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Wed Apr 1 15:02:30 2026, Tyler, Update, TCS, A# FROSTI Profiles Optimization 04/02/2026
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Slides discussing SURF, OPD, and SURF+OPD
optimizations for idealized FROSTI A# profiles.
Quote:
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Thu Apr 16 13:14:42 2026, Tyler, Update, TCS, A# FROSTI Profiles Optimization 04/02/2026
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Slides discussing including overlapped
irradiance profiles at the center of an A# ITM.
Quote:
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Thu Apr 16 12:53:30 2026, Cynthia, Update, Interferometer Simulations, O5 Test mass
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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 |
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Thu Apr 9 12:40:24 2026, Xuesi Ma, Update, TCS, A# Ring Heater Design
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Slides discussing for A# Ring Heater
design.
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Thu Apr 2 12:23:40 2026, Michael, Update, Interferometer Simulations, Update Plots and Squeezing Behavior With Toroidal Mirrors
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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 |
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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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Wed Mar 11 19:38:21 2026, Pooyan, Infrastructure, Cleanroom, Parts and things to get after the cleanroom move 8x
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concrete Caulk to fill the drill holes in 1119
Example [Pooyan:
I have a caulk gun and silicon caulk at home, if needed.]
Water hose for the washer in 1125
1/2" diameter
almost
8 Ft
Exhaust for the oven in 1125
Question: not sure which way we want the exhaust to go. Measurements depend |
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Thu Mar 5 12:08:47 2026, Pooyan, Infrastructure, Cleanroom, Cleanroom HEPA fan defect
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[Pooyan, Ma, Mary, Tyler]
While re-installing the clean-room HEPA fan filters, we realized that one of the blowers is broken. The issue seems to be that the plastic damper
bracket that is keeping the blower in place has failed. The fix is to open up the fan unit, and replace the broken vibration damper. We installed the |
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Thu Feb 26 20:25:10 2026, Cynthia Liang, Update, Interferometer Simulations, Point Absorber+Miscentering Simulation
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Thu Feb 19 12:34:18 2026, Cynthia, Update, Interferometer Simulations, Point absorber simulation
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Thu Feb 12 13:50:38 2026, Xuesi Ma, Update, VAC, Vacuum status warning system
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Vacuum Pressure Warning Script
Script Location: controls@chimay
Script Path: /vac/python/serial/temp_vacuum_warning.py
Purpose
Implement an automated warning system that monitors vacuum pressure and sends
email alerts when pressure thresholds are |
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