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Entry  Tue Jul 29 11:27:57 2025, Liu, Update, Interferometer Simulations, Multi-ring FROSTI optimization for A# Update.pdfscene-export-temp.htmlscene-export-deformation.html
 
Entry  Tue Aug 5 12:21:04 2025, Liu, Update, Interferometer Simulations, FROSTI A# optimization Update.pdf
A# multi-ring FROSTI optimization
Entry  Tue Aug 12 12:16:21 2025, Liu, Update, Interferometer Simulations, Multi-ring FROSTI optimization for A# Update.pdf
Multi-ring FROSTI optimization for A# with static polishing
Entry  Tue Aug 12 13:32:43 2025, Liu, Update, Interferometer Simulations,  Screenshot_2025-08-12_at_1.31.11_PM.pngScreenshot_2025-08-12_at_1.31.17_PM.png
Differences in Fused Silica parameters.
Entry  Tue Aug 26 12:14:24 2025, Liu, Update, Interferometer Simulations, Multi-ring FROSTI design for A# with ring heater optimization  Update_(1).pdf
Multi-ring FROSTI design for A# with ring heater optimization
Entry  Tue Aug 26 12:18:36 2025, Michael, Update, Interferometer Simulations, Squeezing Plots for SRC Parameter Space Screenshot_2025-08-26_at_12-16-01_LIGO_Project_Log_-_Google_Docs.pngScreenshot_2025-08-26_at_12-16-32_LIGO_Project_Log_-_Google_Docs.pngScreenshot_2025-08-26_at_12-17-26_LIGO_Project_Log_-_Google_Docs.png
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 see evidence of. Additionally, as observed squeezing is computational expensive to compute, I found that the difference in round-trip gouy phase accumulation between the x and y planes is a good approximation for an optimal squeezing state, which I believe makes physical sense. This may be helpful to quickly compute other optimal conditions.
Entry  Tue Sep 2 12:41:33 2025, Liu, Update, Interferometer Simulations, Multi-ring FROSTI design for A# with ring heater optimization Update.pdf
[Tyler, Liu] Ring heater optimization, continued
Entry  Tue Sep 9 12:13:38 2025, Liu, Update, Interferometer Simulations, Multi-ring FROSTI optimization for A# with grid search Update.pdf
Multi-ring FROSTI optimization based on IFO metrics for A# with grid search
Entry  Tue Sep 16 12:18:09 2025, Liu, Update, Interferometer Simulations, Grid search optimization for single-ring FROSTI Update.pdf
Grid search optimization for single-ring FROSTI
Entry  Tue Sep 16 12:47:29 2025, Xuesi Ma, Update, Interferometer Simulations, Frosti actuation impact analysis 
Slides
Entry  Tue Sep 23 12:39:29 2025, Liu, Update, Interferometer Simulations, Multi-ring FROSTI optimization for A# Update.pdf
 
Entry  Tue Sep 30 12:26:15 2025, Liu, Update, Interferometer Simulations, FROSTI optimization for A# Update.pdf
 
Entry  Thu Oct 9 12:18:14 2025, Liu, Update, Interferometer Simulations, Multi-ring FROSTI optimization for A# Update.pdf
 
Entry  Thu Jun 2 16:14:58 2022, Jon, HowTo, General, Custom conda environment on JupyterHub 

Cross-linking instructions: How to run a Jupyter notebook in your custom Conda environment

Entry  Mon Jul 11 14:29:45 2022, Jon, Omnistructure, General, HEPA filter installed IMG_1530.png
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.
Entry  Mon Jan 23 17:26:15 2023, Peter Carney, Update, General, Oven cleaning 
Aiden and Cao Turned on the oven to 120 deg C for 12 hours. After 12 hours, put it at 200 deg C for 48 hours.
Entry  Thu Jan 26 18:58:25 2023, Aiden, Update, General, Oven Heating 
Aiden cleaned the oven with methanol again and set the oven to 260 degC for 12 hours.
Entry  Fri Jan 27 18:44:31 2023, Julian , Update, General, Vacuum Chanmber Cleaning 
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.
Entry  Fri Feb 3 13:04:04 2023, shane, Summary, General, clean room particle counts 1/25/23 cleanroomcountsJan25.pdf
Clean room count graphs for each zone (as of January 25, 2023) attached
Entry  Mon Feb 6 20:02:32 2023, Julian, Update, General, Cleanroom Update 
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.
Entry  Fri Feb 10 15:15:30 2023, Aiden, Update, General, Bagging First Batch 
Aiden Bagged and Tagged the first batch of stainless steel parts shown on the google spread sheet. 1. Removed two parts from the oven. 2. Place them in the ESD bag. 3. Seal bag with Kapton Tape. 4. Create label including part name and number underneath it. 5. Put label onto the side of the bag where it is not sealed with tape. 6. Placed bagged items into clean room on work table. ps. total bags in first batch = 4
Entry  Sat Feb 11 00:17:27 2023, Julian, Update, General, Vacuum Chamber Cleaning 20230210_181404.jpg20230210_181424.jpg20230210_181541.jpg20230210_181606.jpg
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 ports."
Entry  Sat Feb 11 17:09:29 2023, Shane, Update, General, clean room particle counts 2/10/23 occupied2.10.23.pdfunoccupied2.10.23.pdfparticlecounts2.10.23.PDF
Took a round of clean room counts after the latest clean of vacuum chamber on Feb 10. Used 60 second sample time, 5 samples for each of the 5 zones. Plots attached for both occupied clean room (one person inside, attachment 1) and unoccupied clean room (empty attachment 2), as well as the raw data from the particle counter (attachment 3).
Entry  Mon Feb 13 18:57:53 2023, Aiden, Summary, General, Clean and Bake batch 2 
Cleaned second batch of SS parts with liquinox for 20 min. Then put in oven for 5 steps; 1. Ramp, 100 degC, 15 min 2. Const, 100 degC, 30 min 3. Ramp, 200 degC, 30 min 4. Const, 200 degC, 48 hours 5. Ramp, 25 degC, (off).
Entry  Fri Feb 17 19:12:39 2023, Aiden, Update, General, Clean and Bake batch 3 IMG_4126.jpgIMG_4125.jpg
Bagged and Tagged batch 2 parts by placing no more than two parts per ESD bag then taped them with kapton tape and tagged them with their name and part number. Than placed them inside the clean room on the work bench. Total of 3 Bags used. For Batch 3- Cleaned all copper gaskets with liquinox for 10 minutes, dried them off with nitrogen, then placed into oven where the are currently undergoing the following steps; 1. Ramp to 100 deg C in 15 minutes. 2. Dwell at 100 degC for 30 minutes. 3. Ramp to 175 degC in 30 minutes. 4. Dwell at 175 degC for 24 hours. 5. Turn off and cool down to room temperature. To see the specific parts in batches 2 and 3 refer to the clean and bake data sheet. https://docs.google.com/spreadsheets/d/19gnv1q9l64gxnq76KfcXizbqShJfK0ayn2Js1SiAZok/edit?skip_itp2_check=true#gid=1549161924
Entry  Tue Feb 21 17:51:04 2023, Aiden, Summary, General, Clean and Bake batch 4 IMG_4148.jpgIMG_4147.jpg
Bagged and Tagged batch 3 parts by placing no more than two part numbers per bag and taped them with kapton tape and labeled them with their name and part number. Then placed them in the clean room on the work bench. Cleaned batch 4 parts with liquinox and placed the into the oven for 5 steps; 1. Ramp to 100 degC in 15 minutes. 2. Dwell at 100 degC for 30 minutes. 3. Ramp to 200 degC in 30 minutes. 4. Dwell at 200 degC for 48 hours. 5. Turn off and cool down to room temperature. To see the specific parts in batch 4 please refer to the Clean and Bake spread sheet on the Richardson lab page: https://docs.google.com/spreadsheets/d/19gnv1q9l64gxnq76KfcXizbqShJfK0ayn2Js1SiAZok/edit#gid=1765414234
Entry  Thu Feb 23 13:32:55 2023, Shane, Update, General, Clean room floor particle counts 2.23.2023.pdf
Here are the counts from the clean room floor today. The counts should be dated- the ones from today (2/23/23) are the last 8 in the chart. The first set of 2 measurements from today were under the table by the clean room entrance, the next two were under the table by the vacuum chamber, the next two were on the floor by the vacuum chamber lid, and the last two were on top of the table for comparison. All measurements were taken using 2 minute sample time.
Entry  Thu Feb 23 21:12:33 2023, Julian, Update, General, Vacuum Chamber Cleaning ChamberLid_inside.jpgChamberLid_outside.jpgVacuumChamber_inside.jpg
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 wipe the inside of the vacuum chamber. The inside is still giving off residue, but very minimally, a photo for this is attached as well.
Entry  Mon Feb 27 17:09:04 2023, Pamella , Update, General, Vacuum Chamber Cleaning Side_of_Table.jpegWipes_from_table.jpeg
Pamella and Julian finished cleaning the interior of the chamber, chamber lid, and the table. We found some black residue on the side of the table but not sure what the issue is. A picture of the specific area of the table that is giving off the black residue is attached below. The next step from here would be to flip the chamber on its side and finish the cleaning the exterior.
Entry  Tue Feb 28 13:53:17 2023, Pamella, Update, General, Vacuum chamber cleaning  EE5E0296-D362-4EA6-B482-85A629D93B46.jpeg4C0AA805-667E-45AD-8704-03389BD63489.jpeg51CE3D1E-F48E-4F57-8450-8F58C27154BB.jpeg58ADE656-52AD-4F0E-88BA-B993F977A519.jpeg
Pamella, Dr. Richardson and Dr.Cao finished checking and cleaning the interior of the chamber, chamber lid, and exterior of the chamber with Vectra Alpha wipes, IPA and in some parts we used acetone . We flip the chamber and put chamber on the table again. A picture of the specific situation is attached below. The next step from here would be to finish the cleaning the floor . The black residues on the side of the table probably is some reaction between the Vinil and the wipes so is not necessary cleaning this part deeply.
Entry  Tue Feb 28 19:37:22 2023, Aiden, Summary, General, Clean and Bake batch 5 IMG_4168.jpgIMG_4169.jpgIMG_4170.jpg
Bagged and Tagged batch 4 parts by placing no more than two part numbers per bag and taped them with kapton tape and labeled them with their name and part number. Then placed them in the clean room on the work bench. Cleaned batch 5 part (Viton O-Ring) with liquinox and placed the into the oven for 5 steps; 1. Ramp to 100 degC in 15 minutes. 2. Dwell at 100 degC for 30 minutes. 3. Ramp to 180 degC in 30 minutes. 4. Dwell at 180 degC for 48 hours. 5. Turn off and cool down to room temperature. To see the specific parts in batch 5 please refer to the Clean and Bake spread sheet on the Richardson lab page: https://docs.google.com/spreadsheets/d/19gnv1q9l64gxnq76KfcXizbqShJfK0ayn2Js1SiAZok/edit#gid=1765414234 Hand cleaned stainless steel containers and silver coated screws. Designated each container with its contents with the label maker and placed inside the clean room. Should be noted that the fasteners were very clean before the hand cleaning and showed not dirt on the wipes. Added these parts to the clean and bake data base sheet and designated the type of cleaning as "rough cleaning". Gabriella helped with this cleaning and today was her first day in the lab.
Entry  Thu Mar 2 20:53:56 2023, Julian, Update, General, Cleanroom Update 
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.
Entry  Fri Mar 3 19:13:33 2023, Aiden, Summary, General, Clean and Bake Batch 6 IMG_4173.jpgIMG_4174.jpg
Started to clean the dirtiest of the valves. I could not finish but I definitely made good progress on it. The MDC valve is very dirty and there are many places I could not reach with my fingers. I used Acetone and IPA for this first round of cleaning on it. I also was going to bag the viton O-Ring from the previous Batch, however it seems to have broken during the bake and I am leaving it inside the oven for now.
Entry  Sat Mar 4 00:34:46 2023, Julian, Update, General, Cleanroom Update 
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.
Entry  Mon Mar 6 15:32:58 2023, Jon, Infrastructure, General, Cabinet installation completed IMG_0088.jpgIMG_0089.jpg

Jon, Cao, Peter

This morning Facilities delivered and installed two new cabinets with sliding glass doors.

The smaller of the two (36" W x 13" D x 84" H) has been installed in the Clean & Bake area adjacent the flow bench. The larger one (48" x 16" D x 84" H) has been installed in the back of the room next to the electronics bench. Both cabinets have been securely anchored to the wall in two places each for earthquake safety.

We also installed the sliding glass doors and leveled them. However, we have not installed any of the shelves yet because the cabinets are quite dirty from the installation. Everything needs to be wiped down with IPA wipes, and it will be easier to do that before the shelves are in place.

Entry  Mon Mar 6 18:48:43 2023, Pamella, Update, General, Cleanroom update  203863E0-106A-465E-8D9C-461B0358FB60.jpeg779F360D-CAD0-4C49-AE0B-973F97F6D099.jpeg276B9F0C-6661-441F-AD34-D79DA61E1FC3.jpeg
Today Pamella and Julian finished cleaning of the new lab cabinets. Also we wiped the computer and put inside the cleanroom so now the computer is not move out side anymore. We saw some dirty parts in the cleanroom floor again and is possible for the next step we should be clearing the floor one more time. Possible is necessary order more IPA wipes for keep cleaning in nexts weeks. A photos of the cabinets and the computer are attached below.
Entry  Wed Mar 8 19:29:00 2023, Aiden, Summary, General, Clean and Bake batch 7 IMG_4180.jpgIMG_4182.jpg
Today gave another cleaning to the MDC gate valve. It is still very dirty an will need more cleaning. I also cleaned the other 3 valves and the argon leak. These are also in bags inside the clean room. I cleaned them by hand with IPA wipes and had to specifically give the MDC up to air valve a harder clean with acetone as it was not getting clean with the IPA. This valve still has a ring around the face as shown in the first image. Be very cautious when moving the parts in the large ESD bag, it may be heavy and the parts will move inside.
Entry  Thu Mar 9 13:51:42 2023, Shane, Update, General, Clean room counts 3/9/23 particlecounts3.9.23.pdfclean_room_zones.JPG
Here's the clean room counts from this morning. Also attached is rough diagram of where the five zones are in the clean room. Counts taken with 2 minute sample time, three samples in each zone.
Entry  Tue Mar 14 18:21:41 2023, Aiden, Summary, General, Clean and Bake batch 8 
Starting off Peter and I refilled the deionized water barrel. Then Aiden Cleaned and Bake the FROSTI arms and bases in liquinox for 5 minutes. Then placed them in the oven where they will undergo the following steps; 1. Ramp to 100 degC in 15 min. 2. Dwell at 100 degC for 30 min. 3. Ramp to 120 degC in 30 min. 4. Dwell at 120 degC for 48 hours. 5. OFF Also cleaned the 2.75 MDC Gate valve for 20 minutes (10 minutes each side) in liquinox. It looks significantly cleaner in areas I could not reach before. However some areas like the flat bottom threaded holes are still very dirty. I also made sure to dry it thoroughly and wrapped it in UHV foil until I further cleaning is decided.
Entry  Fri Mar 17 19:46:39 2023, Aiden, Summary, General, Clean and Bake batch 9 IMG-4208.jpgIMG-4209.jpg
Bagged and Tagged the reflector arms and bases and placed them inside the clean room. Total of 2 bags used. Cleaned and Baked parts in batch 9 on the spread sheet and used the following procedure; 1. Ramp to 100 degC in 15 min. 2. Dwell at 100 degC for 30 min. 3. Ramp to 200 degC in 30 min. 4. Dwell at 200 degC for 48 hours. 5. OFF Also soaked the 2.75" CF gate valve in acetone to try and clean the open threads around the part. Then cleaned it in the ultrasonic washer with liquinox for 20 minutes (10 minutes each side). It looks better than it used to but the threads still seem to be the problem and will probably need even further cleaning.
Entry  Wed Mar 22 15:25:00 2023, Shane, Update, General, Clean room recertification particle counts  counts3.22.23.pdf
Attached are the five zone particle measurements for the clean room now that the fan speeds have been set to MEDIUM. 2 min sample time, 3 samples per zone. The occupied clean room measurements were unusual in that they generally got larger towards minute 6 instead of settling and going to zero, and for this reason didn't stay beneath the class 5 requirement at the end of the samples. The unoccupied counts look more similar to what was expected, and generally settle under the class five requirement.
Entry  Thu Mar 23 18:40:08 2023, Julian, Update, General, Cleanroom Update 
Today Pamella and I came in to Hepa vacuum and mop the floor of the cleanroom for general maintenance.
Entry  Fri Mar 24 13:36:17 2023, Pamella, Update, General, Clean and Bake batch 10 260AEB73-02D0-4635-93B3-B2EB3269FB84.jpeg59FD199A-A444-439A-8D51-C242B65BBECD.jpeg9A48A0EE-5EFE-409D-ACC0-17011F6F7EBF.jpeg950F85B7-D304-4724-AB3D-B606E422F1E3.jpeg
Today I bagged and tagged batch 10. I wiped the RGA vacuum component for around 25 minutes after that I bagged and tagged this part and put inside the cleanroom. The RGA vacuum component have a big size and because off that i used the big bag. I wiped one power cable (2 meters), bagged and tagged that and inside the cleanroom. For the parts in the oven, a bunch of screws, I bagged and tagged the screws and put inside the cleanroom. I put photos below about this process.
Entry  Fri Mar 31 14:23:13 2023, Pamella, Update, General, Clean and bake batch 11 4AC705B8-D906-47E3-86E4-49E4967910E7.jpeg
Today I bagged and tagged batch 11. I wiped the some tools: Centering ring alum( 2 pieces), reversible ratcheting, gasket removal (CF). After wiped that I bagged and tagged this parts and put inside the cleanroom. Also I wiped one power cable (3 meters), bagged and tagged that and inside the cleanroom. I put photo below.
Entry  Mon Apr 3 17:04:05 2023, Aiden, Summary, General, IDP Scroll Pump Assembly IMG_4244.jpg
Aiden installed the isolation valve and the exhaust silencer kits on the IDP-3 Scroll pump. The entire assembly still needs to be wiped down but overall no residue came off when putting on the kits.
Entry  Fri Apr 7 09:48:09 2023, Pamella, Update, General, Clean the system parts 7x
Pamella and Julian wiped and tag system parts for the vacuum machine. We used isopropyl and vectra wipes in the most import pieces: Inverted magnetron pirani gauge and the air cooling kit 81. The other parts we uses the IPA wipe for cleaning. So for now we finished with ever system parts which was in the gabinetes. I put photos below. The photos is for all part we cleaning, tag and which puted inside the cleaning room.
Entry  Tue Apr 11 17:56:15 2023, Pamella, Update, General, Lab cleaning  
Today Pamella and Julian finished cleaning of the cleanroom, starting with the HEPA vacuuming, mopping and clearing all floor with IPA wipes. Also we wiped down some surfaces of the blue table, computer table and the top of chamber.
Entry  Wed Apr 12 10:53:02 2023, Aiden, Summary, General, Valve Cleaning 
Bagged and Tagged the parts from batch 10 and placed them inside the clean room. Then cleaned the last gate valve in liquinox for 20 minutes (10 minutes each side). Then dried the valve, bagged, tagged, and placed it inside the clean room.
Entry  Wed Apr 12 16:17:50 2023, shane, Update, General, Particle Counter moved IMG_6693.HEIC
With the added height of the new docking station, the particle counter no longer fits under the Windows monitor in the electronics rack and has been moved to the desk in the corner of the lab.
Entry  Mon Apr 17 17:06:49 2023, Aiden, Summary, General, Clean and Bake batch 11 IMG_4262.jpg
Cleaned the Viton O-Ring for the main chamber in Liquinox for 10 minutes. Then put it in the oven to back for; 1. Ramp to 100 degC in 15 min. 2. Dwell at 100 degC for 30 min. 3. Ramp to 180 degC in 30 min. 4. Dwell at 180 degC for 24 hours. 5. Off Note: There were three viton -rings in the bag sent to us. I cleaned and baked 2 of them and left the third in the bag.
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