 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. |
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Wed Jan 18 22:06:05 2023, Julian, Update, ELOG, Cleanroom Update
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| I wiped down all the inner walls of the cleanroom using alcohol wipes, as per Cao's instruction. |
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Mon Feb 6 20:02:32 2023, Julian, Update, General, Cleanroom Update
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I wiped down the main table (including frame, legs, and transparent shelf) and workbench using alcohol wipes. Once I cleaned all of the surfaces, I used
the Hepa vacuum to pick up any fallen debris. |
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Sat Feb 11 00:17:27 2023, Julian, Update, General, Vacuum Chamber Cleaning
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Today I finished wiping down the rest of the vacuum chamber, specifically focusing on the connecting ports and outside surface of the chamber. When I was
finished, I test wiped every surface of the chamber and took pictures confirming the current state of cleanliness; Attachment 1 "Wipes for top and bottom
of chamber's upper lip." Attachment 2 " Top and bottom of chamber's lower lip." Attachment 3 "Inside and Outside main chamber." Attachment 4 "Inside connecting |
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Thu Feb 23 21:12:33 2023, Julian, Update, General, Vacuum Chamber Cleaning
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Today I was able to come in and wipe down both sides of the vacuum chamber lid using the regular alcohol wipes and also wipes that were left to dry in the
fume hood then saturated with acetone. I managed to get a good amount of the residue off both the inside and outside surfaces of the lid, then did a test
wipe of both sides using acetone-soaked wipes; pictures of the wipes are attached below. Once I finished with the lid, I used another acetone wipe to test |
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Thu Mar 2 20:53:56 2023, Julian, Update, General, Cleanroom Update
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Today Pamella and Julian began the final cleaning of the cleanroom, starting with the HEPA vacuuming and mopping then wiping down every surface of the laser
table. We wiped the main tabletop as well as the legs, but we were unable to completely wipe down the upper frame of the table before we had to leave.
For next steps, Julian will come in on Friday and finish cleaning the frame, then both of us will come in on Monday to finish the final cleaning. |
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Sat Mar 4 00:34:46 2023, Julian, Update, General, Cleanroom Update
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Today I was able to finish cleaning the frame of the laser table, and for good measure I wiped down the tabletop and exterior of the vacuum chamber when
I was finished. I was also able to go through and wipe down the bags containing the vacuum parts as well as the tabletop of the workbench. |
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Thu Mar 23 18:40:08 2023, Julian, Update, General, Cleanroom Update
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| Today Pamella and I came in to Hepa vacuum and mop the floor of the cleanroom for general maintenance. |
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Tue May 2 17:03:14 2023, Jon, Cao, Physics, VAC, First pump-down test of vacuum chamber
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[Jon, Cao]
1. Re-routing of cables
We re-routed the connections between the turbo pump and its fan to the controller. Instead of going through the side of the server rack, they |
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Thu Jun 29 18:27:26 2023, Jon, Cao, Infrastructure, VAC, Vacuum bake attempt 3: success!
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[Jon, Cao]
Summary : We resolved problems with heaters tripping power and were able to proceed with chamber baking
1. Circuit connection adjustment
After yesterday elog 137, today we resolved
most of these issues. After Jon contacted Facilities, the LP3B 6 circuit was reset and the cleanroom filter & light panels resumed to work as normal.
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 Mon Nov 13 11:23:54 2023, Jon , Update, CDS, CyMAC testing
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[Jon, Shane, Luis]
My repair of the internal ribbon connecting the ADC to the adapter board resolved the timing signal problem. After this repair, we were able to
start the front-end IOP model and checked out the RTS diagnostic screens (pictured below). All indicator lights were green except for the DK flag (indicating |
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Thu Jun 2 16:14:58 2022, Jon, HowTo, General, Custom conda environment on JupyterHub
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| Cross-linking instructions: How to run a Jupyter notebook in your custom Conda environment |
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Thu Jun 2 21:55:02 2022, Jon, Update, Cameras, FLIR Camera Setup
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The new FLIR A70 infrared camera has arrived. Tyler and I unpacked it in the lab yesterday. In less than an hour, we succeeded in powering it on and
connecting it to the lab network. We have assigned it the static IP address 192.168.1.6.
Online Configuration Portal
The FLIR camera can be configured, as well as stream live data, through a web browser interface. It can |
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Fri Jun 3 13:03:33 2022, Jon, Update, Cameras, FLIR Camera Setup
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Summary
I have installed the requisite software on chimay for interfacing the FLIR A70 camera in Python. There are two packages required from
FLIR:
Spinnaker SDK, which provides the low-level camera drivers and a C/C++ API.
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Mon Jun 6 17:11:48 2022, Jon, Update, Cameras, FLIR Camera Setup
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Today I tested the Spinnaker/PySpin software installations (detailed in ELOG #4) with the FLIR
camera connected to chimay. It works!
Example codes
I was able to run several of the PySpin example codes. In particular, there is one which connects to the camera and streams |
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Mon Jul 11 14:29:45 2022, Jon, Omnistructure, General, HEPA filter installed
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Today I unpacked and installed the new HEPA filter for the lab. It is an Omni CleanAir OCA1210 capable of 1200 CFM. This flow rate is sufficient to turn
over the air in the room once every 4 minutes, or 14 times per hour. Hopefully this will cut down on our particulate accumulation issues. |
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Wed Dec 14 17:35:41 2022, Jon, Infrastructure, Computers, Windows Laptop
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I set up the new Windows 10 laptop (pictured below), which arrived yesterday. This laptop is intended to be used for running lightweight Windows-only
programs, such as the Thorlabs beam profiler software or the SRS RGA client. However, none of that software is installed yet.
Configuration details
As usual, the computer is configured with one shared account (username: controls) and the standard password. Note |
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Wed Dec 14 18:34:33 2022, Jon, Configuration, Electronics, Adapter for 532 nm laser power supply
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I installed an EU-to-US plug adapter for the 532nm laser's 9V power supply. I then re-measured the laser's power with the correct supply voltage (previously
we had been using a 6V supply). At 9V, the max power is 0.83 W, so the laser is confirmed to be Class 2 as labeled. |
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Tue Feb 7 17:44:17 2023, Jon, Infrastructure, Computers, Workstation 1 (ws1) set up
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The Linux workstation (ws1) that used to sit on the old workbench has been mounted on the new electronics bench and is now ready for use again. I upgraded
the OS to Debian 11.6 and also upgraded the CDS workstation tools. |
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Wed Mar 1 21:27:20 2023, Jon, Infrastructure, Cleanroom, Over-table shelf height raised
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Jon, Cao
Today we raised the height of the shelf overhanging the cleanroom laser table by 8 inches. This was done to create more vertical clearance between
the top-loading vacuum chamber and the bottom of the shelf. The added clearance should make both removing the chamber lid and inserting large parts easier. |