 Mon Dec 16 21:32:21 2024, Luis, Update, VAC, MR Testing 
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[Luis, Luke]
The MR material was placed in the vacuum chamber following standard procedures to ensure the vacuum remained as clean as possible.
During this process, we only opened the main
volume while keeping the gate valve between the two volumes closed to maintain the UHV in the RGA section.
An
RGA scan was taken before this process, this will be used to compare the state of the vacuum with the sample inside to determine whether the MR material |
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Tue Dec 17 13:53:53 2024, Luis, Update, VAC, Vacuum system status
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[Luis]
The vacuum system is being baked. I disconnected the digital gages and the magnets, opened the Ar leak and started the bake by taking
the temperature from 60C-90C-125C waiting about 15-20 minutes between each interval. The RGA electronics were left on since the temperature of the flange
was 36.6C (bellow the 60C threshold) |
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Sun Dec 22 20:43:35 2024, Luis, Update, VAC, MR Testing
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[Luis, Luke]
RGA Volume: T = 23°C, P = 3.0e-9 Torr
Main Volume: T = 22°C, P = 9.90e-9 Torr
After letting the vacuum cool down for a couple days, we reattached the magnets and sensors, then we performed a RGA scan of the vacuum system, |
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Thu Jan 2 17:52:58 2025, Luis, Update, VAC, MR Testing Continuation
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[Luis, Luke]
RGA Volume: T = 22°C, P = 2.10e-9 Torr
Main Volume: T = 21°C, P = 5.71e-9 Torr
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Tue Feb 11 08:07:02 2025, Luis, Update, VAC, Bake stopped
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[Luis, Ma]
Feb/10/25 4:00pm
Bake was stopped. |
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Fri Feb 14 11:57:50 2025, Luis, Update, VAC, Vacuum Update
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[Luis]
Feb/11/25 9:30am
Pressure gages were connected. |
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Fri Feb 14 12:15:23 2025, Luis, Update, VAC, Vacuum sytem staus
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[Luis, Luke, Ma]
February 12, 2025 - 4:00 PM
We performed an RGA scan with the vacuum system containing the heater elements. The results are attached below. |
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Thu Feb 20 17:07:36 2025, Luis, Update, VAC, RGA Scan
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[Ma, Luis]
February 20, 2025 - 3:30 PM
Ma performed an RGA scan with the vacuum system containing the heater elements. The results are attached below. |
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Mon Feb 24 17:50:13 2025, Luis, Update, VAC, RGA Scan
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[Ma, Luis]
February 24, 2025 - 1:00PM
Ma performed an RGA scan with the vacuum system containing the heater elements. The results are attached below. |
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Mon Apr 28 22:08:28 2025, Luis, Update, VAC, Vacuum Leak Test result
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[Ma, Luke, Luis]
April 24, 2025
3:00 PM |
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Wed Apr 30 15:43:56 2025, Luis, Update, VAC, Vacuum Update
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[Ma, Luke, Luis]
April 29, 2025
3:30 PM |
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Thu May 8 17:41:56 2025, Luis, Update, VAC, RGA Scan Post Bake
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[Ma, Luis]
After taking the RGA scans of the new system, here are the results of the raw and normalized data.We can see that in the post baked system
the He peak is way lower, and the peaks around 20AMU are also significantly lower. |
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Fri Jun 14 13:32:13 2024, Liu, Update, Scripts/Programs, COMSOL simulation on rectangular heater elements design 6x
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I have been looking at the feasibility of an alternative heater element design for FROSTI that replaces the original ring-like heater elements with n
rectangular elements with straight edges. They form an n-sided regular polygon that could well approximate the original annular ring if n is large enough.
This eliminates curved surfaces requirement for the heater elements, which was the source of the many month production delay for the prototype parts. |
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Mon Jun 17 11:47:46 2024, Liu, Infrastructure, General, Temporary cooling units for the labs
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Below are the temporary cooling units installed last week in labs 1119 and 1129. They are the temp. replacement for the building AC system, which will be
shut down during the Physics roof replacement. |
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Fri Jun 21 11:47:30 2024, Liu, Update, Scripts/Programs, COMSOL simulation on alternative straightened heater elements design 6x
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In the previous post, we saw that for the heater element design with straight
edges in replacement of the current eight-element ring-like design, it provides the similar Gaussian-like irradiance profiles, but with smaller power delivery
efficiencies, as shown in the plot. This turned |
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Thu Jun 27 11:09:14 2024, Liu, Update, Scripts/Programs, Straight edge STEP files and ray loss analysis
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Drawings and CAD models of the straight-edge designs are exported, and are visualized in SOLIDWORKS. Two are attached. One is a single edge of the evenly
spaced polygon design with 16 edges, and the other is the 8x2 design, with two neighboring edges grouped together to replace the original single curved
heater.
For the straight edge design in COMSOL, ray power detectors were placed at the heater's front surface. The irradiance is shown in |
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Fri Jul 5 13:17:44 2024, Liu, Update, Interferometer Simulations, Four-quadrant FROSTI-like RH for astigmatic thermal actuation for CE optics 7x
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In the CE corner layout design and down selection study, interferometer layouts with large incidence angles on some of the curved optics are being considered,
such as the folding mirrors in the "long crab". This however generates astigmatic beams upon reflection and results in mode mismatches in coupled cavities
that need to be mitigated. Astigmatic thermal actuation for the optics involved is thus essential. One way we are considering is to implement a FROSTI-like |
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Fri Jul 5 14:12:32 2024, Liu, Update, Interferometer Simulations, CE BS Mechanical Resonances
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The butterfly and drumhead mechanical modes for the aLIGO BS were calculated in COMSOL. The resonant frequencies for the two acoustic modes are 2.45
kHz and 3.61 kHz, matching the results in reference
for instance.
For a quick projection for the resonant frequencies going from aLIGO to CE, the height and width of the BS are increased assuming |
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Fri Jul 5 14:23:13 2024, Liu, Update, Interferometer Simulations, Engineering drawings for straight edge heater element designs for FROSTI
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Step files and engineering drawings for the straight edge heater element designs have been created in COMSOL and SolidWorks. They are available in the group
Git
Repo. With those, we will initiate a discussion with the ceramics supplier for an estimate of the feasibility and benefits of the straight edge element |
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Mon Jul 15 09:36:44 2024, Liu, Update, Interferometer Simulations, ETM Profile Optimization for FROSTI
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This is to optimize the FROSTI heating profile for ETM, by minimizing the residual RMSE of the HR surface deformation after the beam size weighted curvature
is removed by the current RH. The parameters of the profile being explored are the location, width, and total power for the Gaussian Annulus. As shown
in the attached series of plots, the optimal location is 9.9 cm, with a width of 7.7 cm, and a total FROSTI power of 12.7 W (for 1 W of Gaussian beam absorption). |
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Mon Jul 29 12:18:52 2024, Liu, Update, Interferometer Simulations, Update on FROSTI O5 ETM profile optimization
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| Update on FROSTI O5 ETM profile optimization is attached. |
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Mon Jul 29 12:20:56 2024, Liu, Update, Interferometer Simulations, Update on wavefront actuation with astigmatically driven RH for CE
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| Update on wavefront actuation with astigmatically driven RH for CE is attached. |
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Mon Jul 29 12:23:10 2024, Liu, Update, Interferometer Simulations, Update on mechanical resonances of CE BS with stiffener ring
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| Update on mechanical resonances of CE BS with stiffener ring is attached. |
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Wed Oct 2 14:49:59 2024, Liu, Update, , FROSTI ETM actuation
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Proposed FROSTI ETM actuation on the HOM7 resonance.
Animation |
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Wed Oct 16 14:13:31 2024, Liu, Update, , FROSTI with non uniform absorption scattering sources
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| Slides |
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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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Tue Apr 1 11:47:08 2025, Liu, Update, ,
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Tue Apr 8 10:47:10 2025, Liu, Update, General, Test Mass Thermal State Decoder Update
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Tue Apr 15 11:09:37 2025, Liu, Update, FLIR, Test Mass Thermal State Decoder Update with robustness study
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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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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 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 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 2 18:33:38 2025, Liu, Infrastructure, General, New lab room 1125 layout and measurement
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Action items for facilities
Ceiling lights replacement
Fume hood cleaned and refurbished
Sink countertop cleaning
Floor cleaned and waxed
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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 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 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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Wed May 3 19:03:47 2023, Julian,Pamella and Cao, Physics, VAC, Modify vacuum asssembly and install RGA
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[Pamella, Julian, Cao]
Today we started re-configuring the vacuum chamber components.
Particle count
10:45 am : Starting
the particle count in the clean room.
11:13 am : Finished the particle count in the clean room.
Zone 3 :
0.3 u: 2535
0.5 u: 1413
1.0 u: 789
Zone 4 :
0.3 u: 457
0.5 |
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Fri Jan 27 18:44:31 2023, Julian , Update, General, Vacuum Chanmber Cleaning
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I used the IPA wipes to wipe down the inside of the chamber the best I could. I cleaned the main chamber but not any of the connecting joints. When I finished
I did a once over with a fresh wipe and found no residue. |