 Mon Sep 23 08:29:49 2024, Luke, Update, Interferometer Simulations, Ringheater update 
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Ringheater Update
If the link does not work here is the file. |
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Mon Sep 23 15:00:41 2024, Cynthia , Update, Interferometer Simulations, corrections on assumption for O5 coating
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The document recording ETM07 and ETM08 coating (T2300093) was discussed:
the current plume files are not necessarily correct in a way that LIGO lab
have tried to add it on uncoated ETM such as ETM07 and it does not match what the coated ETM07 would look like.
the plume should be added on top of
the uncoated ETM instead of assuming an ideal ETM. According to Garilynn, the imperfection on uncoated ETM matters.
So far the possible ETM data used |
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Wed Oct 2 13:38:00 2024, Cynthia, Update, Interferometer Simulations, cavity scan with averaged O4 ETM coating as plume
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Wed Nov 6 13:48:55 2024, Liu, Update, Interferometer Simulations, QN modeling update
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| Slides |
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Mon Dec 2 00:11:23 2024, Michael, Update, Interferometer Simulations, Status Update on Toroidal Mirrors Project Work
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As it has been significant time from my last update on this project, I compiled a few notes about what I have been working on, current issues, and my future
plans. The past few weeks have been focused on me attempting to obtain a reliable symbolic expression for mismatch. This is important going forward as
it allows us to determine optimal points in the parameter space and the surrounding behavior efficiently without significant computational cost. However |
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Tue Feb 25 01:37:00 2025, Michael, Update, Interferometer Simulations, Updates and Current Next Steps for Toroidal Mirrors Project
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Since the previous discussion of this project, I've worked on building finesse models to verify mathematical results which model the astigmatism in a two
mirror system which we attempt to minimize. This left us with a single condition for an output non-astigmatic beam. However, as can be seen in finesse
simulations, there does exist other configurations which have a negligibly small astigmatism, which we may want to consider. Below I've attached the link |
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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. |
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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 8 00:17:01 2025, Michael, Update, Interferometer Simulations, Squeezing Performance Graphs for Case With and Without Toroidal Mirrors in LIGO
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I've created some graphs for the frequency dependent observed squeezing level in LIGO for both the nominal case and the case where we include toroidal mirrors,
giving some interesting results. https://docs.google.com/presentation/d/1RBr47hNaxFTdGrwys5ZCUEUOgVOVHmZ2B_5EQwY62IY/edit?usp=sharing |
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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 Apr 17 12:12:29 2025, Liu, HowTo, Interferometer Simulations, Preventing Thread Contention in Multiprocessing with Finesse and Cython
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Avoiding Thread Contention When Using Multiprocessing with Finesse
and Cython
When running Monte Carlo simulations or other computational
workloads, it's common to use Python's ProcessPoolExecutor |
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Mon Apr 21 16:56:42 2025, Michael, Update, Interferometer Simulations, Fixed Observed Squeezing Curve for Toroidal Mirror Case
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We've resolved the issue with the observed squeezing curve for the toroidal mirror case showing worse performance at lower frequencies and better performance
at higher frequencies compared to the nominal case. This issue was caused by the beam parameter at the squeezer being fixed before changing the radii of
curvature of the mirrors. This has been changed to be fixed after changing the mirrors, and we see an improvement in the toroidal mirror case. |
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Tue Apr 22 11:04:31 2025, Liu, Update, Interferometer Simulations, Test Mass Thermal State Decoder Update with Interferometer Operation
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Tue Apr 29 10:59:25 2025, Liu, Update, Interferometer Simulations, Test Mass Thermal State Decoder with Updated Comparison Cases
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Tue May 6 13:07:34 2025, Michael, Update, Interferometer Simulations, Initial Convergence Plots for Toroidal Mirrors Project
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Mon May 26 23:24:33 2025, Michael, Update, Interferometer Simulations, Initial Monte Carlo Simulations for Toroidal Mirrors Project
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I've run an initial Monte Carlo simulation for statistical comparison of toroidal mirrors for the dual FROSTI TCS case. Below is the link to the slides.
slideshow |
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Tue Jun 3 12:16:13 2025, Cynthia , Update, Interferometer Simulations, Point absorber simulation on radially averaged profile
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Tue Jun 24 13:47:58 2025, Liu, Update, Interferometer Simulations, Alternative FROSTI A# optimization approach
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| Alternative FROSTI A# optimization approach |
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Tue Jul 29 11:27:57 2025, Liu, Update, Interferometer Simulations, Multi-ring FROSTI optimization for A#
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Tue Aug 5 12:21:04 2025, Liu, Update, Interferometer Simulations, FROSTI A# optimization
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| A# multi-ring FROSTI optimization |
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Tue Aug 12 12:16:21 2025, Liu, Update, Interferometer Simulations, Multi-ring FROSTI optimization for A#
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| Multi-ring FROSTI optimization for A# with static polishing |
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Tue Aug 12 13:32:43 2025, Liu, Update, Interferometer Simulations,
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| Differences in Fused Silica parameters. |
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Tue Aug 26 12:14:24 2025, Liu, Update, Interferometer Simulations, Multi-ring FROSTI design for A# with ring heater optimization
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| Multi-ring FROSTI design for A# with ring heater optimization |
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Tue Aug 26 12:18:36 2025, Michael, Update, Interferometer Simulations, Squeezing Plots for SRC Parameter Space
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I've run a few plots of observed squeezing in the LIGO interferometer to fully ensure that the point we have selected is the optimal point for squeezing.
Contrary to what I expected, there seems to be much more degenerate "optimal" configurations. While the toroidal case may be near optimal, it seems that
the solution we found for a non astigmatic beam is not the only one. I will further explore this space to find more optimal/tolerant positions, which I |
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Tue Sep 2 12:41:33 2025, Liu, Update, Interferometer Simulations, Multi-ring FROSTI design for A# with ring heater optimization
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[Tyler, Liu]
Ring heater optimization, continued |
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Tue Sep 9 12:13:38 2025, Liu, Update, Interferometer Simulations, Multi-ring FROSTI optimization for A# with grid search
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| Multi-ring FROSTI optimization based on IFO metrics for A# with grid search |
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Tue Sep 16 12:18:09 2025, Liu, Update, Interferometer Simulations, Grid search optimization for single-ring FROSTI
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| Grid search optimization for single-ring FROSTI |
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Tue Sep 16 12:47:29 2025, Xuesi Ma, Update, Interferometer Simulations, Frosti actuation impact analysis
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| Slides |
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Tue Sep 23 12:39:29 2025, Liu, Update, Interferometer Simulations, Multi-ring FROSTI optimization for A#
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Tue Sep 30 12:26:15 2025, Liu, Update, Interferometer Simulations, FROSTI optimization for A#
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Thu Oct 9 12:18:14 2025, Liu, Update, Interferometer Simulations, Multi-ring FROSTI optimization for A#
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Thu Oct 16 10:31:20 2025, Liu, Update, Interferometer Simulations, Multi-ring FROSTI optimization for A#
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| Two-ring FROSTI grid search with 4D parameter space search and visualization |
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Thu Oct 23 10:07:51 2025, Liu, Update, Interferometer Simulations, Multi-ring FROSTI optimization for A#
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| 4D parameter space visualization and dimensionality reduction for better optimization |
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Thu Oct 23 11:34:05 2025, Michael, Update, Interferometer Simulations, Updated Exploration into Different SRC Mirror Configurations for Improved Squeezing
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Thu Oct 30 11:45:44 2025, Liu, Update, Interferometer Simulations, Multi-ring FROSTI optimization for A#
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| Multi-ring FROSTI optimization for A#: dimensionality reduction with PCA vs. t-SNE |
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Thu Nov 13 12:39:01 2025, Mary, Update, Interferometer Simulations,
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Thu Feb 5 13:34:13 2026, Cynthia , Update, Interferometer Simulations, Point absorber + miscentering simulation
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Thu Feb 5 13:49:31 2026, Michael, Update, Interferometer Simulations, Updating Squeezing Mode Matching Logic
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After some tests, I have determined that the squeezer in the aLIGO katscript is currently being matched to the SRC. This logic will cause issues if the
SRC mode is perturbed and no longer closely matched to arm modes. Currently, my modification to the code involves taking the arm mode incident at the ITM
and propagate the beam parameter using the ABCD matrix from the ITM to the injected squeezing port. Rerunning some of the squeezing simulations for a cold |
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Thu Feb 5 13:59:42 2026, Mary, Update, Interferometer Simulations,
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Thu Feb 19 12:34:18 2026, Cynthia, Update, Interferometer Simulations, Point absorber simulation
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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 Mar 12 12:48:58 2026, Cynthia, Update, Interferometer Simulations, New Result of point absorber+miscentering
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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 Apr 2 12:23:40 2026, Michael, Update, Interferometer Simulations, Update Plots and Squeezing Behavior With Toroidal Mirrors
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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 16 12:53:30 2026, Cynthia, Update, Interferometer Simulations, O5 Test mass
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Thu Apr 16 14:04:46 2026, Mary, Update, Interferometer Simulations, Beam position optimization algorithm
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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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Thu Apr 23 12:47:05 2026, Cynthia, Update, Interferometer Simulations, O5 Test mass
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