 Tue Sep 12 15:31:31 2023, Aiden, Update, Clean & Bake, Clean and Bake Batch 15 
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Cleaned and Baked the SS screws for the heater mount. Check the Clean and Bake data base on the website to get a precise list of the parts and their numbers.
Cleaned them with liquinox in the ultra sonic washer for 10 minutes. Then dried them with nitrogen. Then put the stainless steel parts into the oven for
the following steps; 1. Ramp to 100 C in 15 minutes 2. Dwell at 100 C for 30 minutes 3. Ramp to 200 C in 30 minutes 4. Dwell at 200 C for 48 hours 5. Turn |
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Fri Jun 16 17:40:28 2023, Aiden, Update, Clean & Bake, Clean and Bake Batch 14
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Cleaned and Baked the new and 2.75" copper gaskets for the vacuum system. Cleaned them with liquinox in the ultra sonic washer for 10 minutes. Then dried
them with nitrogen. Then put the copper parts into the oven for the following steps; 1. Ramp to 100 degC 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
Also bagged and tagged the parts from Batch 13 and placed them into |
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Tue Jun 13 13:25:05 2023, Aiden, Summary, Clean & Bake, Clean and Bake Batch 13
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Cleaned and Baked the new 1.33" and 2.75" blanks for the vacuum system. Cleaned them with liquinox in the ultra sonic washer for 10 minutes. Then dried
them with nitrogen. Then put the two stainless steel parts into the oven for the following 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 |
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Mon Apr 24 17:38:45 2023, Aiden, Summary, General, Clean and Bake Batch 12
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Today I Bagged and tagged the o-rings from batch 11 and placed them inside the clean room. I also cleaned batch 12 parts in liquinox for 10 minutes and
them placed them into 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 200 deg C in 30 min.
4. Dwell at 200 deg C for 48 hours.
5. Off |
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Tue Feb 7 17:27:30 2023, Aiden, Physics, ELOG, Clean and Bake Batch #1
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Cleaned 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)
PS. Ultrasonic washer does not have heating feature. |
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Wed Mar 27 00:03:57 2024, Pooyan, Update, Computers, Chimay relocation to Physics 1129
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[Jon, Pooyan]
Moved Chimay from the server rack in Physics 1119 to a new rack in Physics 1129. It is connected to the switch in that rack
and has the same ip address as before.
All services are up and running.
It appears that JupyterHub creates some processes whenever a user
connects to an instance of it, but in some cases does not stop those processes after the user is not using that instance. This results in having lots of |
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Mon Sep 9 14:27:36 2024, Pooyan, Infrastructure, Computers, Chimay backup attempt
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One ongoing work is to make all lab machines automatically backed-up on Scribe on a daily basis. The updates should be boatable and stored for some time
(potentially a few weeks) on Scribe. Making whole disk images has already been tried for some of the machines with no problems. (e.g., Cymac and WorkStations)
The same thing can not be done with Chimay though, as it currently has one huge RAID-controlled volume that stores all the information (OS, home |
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Mon Jul 24 16:19:29 2023, Shane, Jon, Update, Electronics, Chassis semi-assembled and moved
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Began assembly on AA and AI chassis today, moved them both to top work bench shelf (image attached). They are delicate so please do not disturb them or
put anything on top of them. |
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Tue May 9 20:55:12 2023, Jon, Infrastructure, VAC, Calibrated Ar leak rate
|
For future reference, the calibrated Argon source has a leak rate of 7.55E-8 atm cc/s, or equivalently 5.74E-8
torr L/s. This can be used to calibrate RGA scans to units of physical leakage (outgassing) rate. |
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Sun Mar 24 11:50:37 2024, Aiden, Update, Clean & Bake, Cal Tech FROSTI Parts
|
| Bagged the FROSTI legs and feet after the conclusion of the clean and bake. They are double bagged and sitting in the flow bench. |
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Tue Feb 13 13:02:41 2024, Pooyan, Update, Interferometer Simulations, Cacity sacn of Fabry-Perot
|
| Created a simple model of Fabry-Perot cavity in SIS, and did a cavity scan. Total power in the cavity, 00 mode, and HOMs is measured. |
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Thu Jul 11 21:01:37 2024, Jon, Infrastructure, General, Cable tray installed in 1129
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Today I installed a 10' cable tray in 1129, for permanently routing Ethernet lines to the workstations. It is securely bolted to C-channels in the side
wall and in the center cable tray. |
 Tue Jul 30 07:42:47 2024, Jon, Infrastructure, General, Cable tray installed in 1119
|
Yesterday I installed another 5' cable tray in 1119, for permanently routing Ethernet lines to the L-bench. It is securely bolted to the top of the electronics
rack, on one end, and to the top of the glass-door storage cabinet, on the other. This eliminates the need for the cable ramp which previously sat behind
the rack. |
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Mon Mar 6 15:32:58 2023, Jon, Infrastructure, General, Cabinet installation completed
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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" |
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Mon Jan 15 22:29:34 2024, Jon, Infrastructure, General, Cabinet installation & lab clean-up completed
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[Jon, Tyler, Aiden, Shane, Pooyan, Michael, Cynthia, Luke]
On Wednesday, we completed long list of work towards making the new lab (1129) fully operational and enabling the next phase of FROSTI testing.
Cabinet Installation
Three new VWR cabinets with sliding glass doors were installed in 1129. Each unit measures 48" |
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Fri Jun 14 13:32:13 2024, Liu, Update, Scripts/Programs, COMSOL simulation on rectangular heater elements design 6x
|
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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Fri Jun 21 11:47:30 2024, Liu, Update, Scripts/Programs, COMSOL simulation on alternative straightened heater elements design 6x
|
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 Sep 17 11:52:48 2026, Ruaraidh Dumbreck, Update, TCS, COMSOL modeling for the ring heater preliminary run 6x
|
This week i have fixed the study to model deformation and thermal expansion in 1 study and corrected some errors in the system.
I have seperated the
study into 2 simulations. 1 modelling the heat flux of the ring heater, for 1W deposited power, only and another modelling the heat flux of the self induced
heating, also 1W deposited power.
since the ring heater heat is deposited closer to the AR face, i made the fixed constraint for this model the middle |
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Thu Sep 3 10:14:21 2026, Ruaraidh Dumbreck, Update, TCS, COMSOL modeling for the ring heater + Shield
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I had a bit of trouble with the deformation model for the simulation but ive fixed it now, although some of the scales are still in meters. I have seperated
the thermal calculation and the thermoelastic deformation into 2 seperate studys. I can parameter sweep the first study but i am currently having issues
with the 2nd study that i am trying to troubleshoot.
I have also set im an expression calculator to measure the change in deformation in "v" (the displacement |
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Tue Sep 1 11:50:44 2026, Ruaraidh Dumbreck, Update, TCS, COMSOL modeling for the ring heater
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I’ve set up the base COMSOL model for Cosmic Explorer ITM optics (450 mm diameter × 300 mm thickness). I implemented the absorbed heat power in the Heat
Transfer module—using 1 W of self-heating and an exaggerated 150 W ring heater power to make the initial thermal gradients easily visible.
Next, I need
to couple the Solid Mechanics physics to compute front-surface thermal expansion, then run a parametric sweep on the ring heater power to find the value |
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Thu Sep 10 10:45:52 2026, Ruaraidh Dumbreck, Update, TCS, COMSOL modeling for the ring heater
|
Since last week, I have put the ring heater on the correct side of the optic and found that the thermal modelling is being limited by the solid mechanics
of the optic, particularily the fixed point on the AR face of the optic. I have been looking into different methods of modelling but not found a solution
as of yet. The silver lining is that i have managed to tie the displacement to the parameter sweep. i have also started reading and learning Braket notation |
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Thu Oct 1 13:04:03 2026, Ruaraidh Dumbreck, Update, TCS, COMSOL Shield modeling (My model scaled to PRL model parmeters)
|
so i have managed to produce good results for my model. I have managed to produce results that agree withing ~0.2%. The metric im using to compare the
2 models is the results sub plot node->data range. This data range shows the maximum+ minimum values for the data being plotted (example attached). in
the case of these graphs one of either the maxima or minima are 0 (depending on orientation of the geometry). I have managed to acheive very close values |
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Mon Jun 10 14:52:38 2024, Tyler, Update, FLIR, CIT FROSTI Analysis Update
|
[Tyler]
Upon further inspection, one adjustment was made to the FROSTI profile analysis: changing the transmission value of the ZnSe viewport. It
was initially assumed that the viewport possessed an AR coating, which would bring the transmission into the 90% range. Without the coating, it drops to
roughly 70%. Assuming no coating, the estimated delivered power was calculated to be 11.7 W. This is consistent with the estimated power given from the |
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Thu Jan 29 12:46:22 2026, Cece Ochoa, Update, , CE Cavity Design Update (4)
|
Update for CE Cavity Arms + Modes
https://docs.google.com/presentation/d/1-dXYylkAbNpHR4WVCx9Q8ryL_xGlH-JSSLXEUQg6b7Q/edit?usp=sharing |
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Tue Jun 3 11:54:06 2025, Cece Ochoa, Update, , CE Cavity Design Update
|
| Update on the design for the CE Cavity Mirrors |
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Thu Nov 6 12:39:43 2025, Cece Ochoa, Update, ELOG, CE Cavity Design Update
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| Updated mode placements and ROC. No thermal effects added yet. |
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Thu Nov 20 13:03:58 2025, Cece Ochoa, Update, ELOG, CE Cavity Design Update
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| Update on grouping 0+8th Order Modes |
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Thu Feb 12 12:53:51 2026, Cece Ochoa, Update, ELOG, CE Cavity Design Update
|
Update on HOM placement w/ cavity locking. Still verifying mode placement
RoC: 28340m and 26874m |
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Thu Mar 12 13:18:49 2026, Cece Ochoa, Update, Interferometer Simulations, CE Cavity Design Update
|
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 23 11:32:48 2026, Cece Ochoa, Update, Interferometer Simulations, CE Cavity Design Update
|
Update on CE Mirror RoC, simulation with FROSTI and cavity locking
View Presentation |
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Fri Jul 5 14:12:32 2024, Liu, Update, Interferometer Simulations, CE BS Mechanical Resonances
|
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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Tue Jun 3 11:50:08 2025, Pooyan, Update, CDS, CDS update
|
There are three major issues with the lab's CDS system that should be addressed. They are ordered from the highest priority to the lowest.
CyMAC has stopped serving the fast channels (65k Hz)The channels are still there, and the data from the slow (16 Hz) channels is served correctly, but the fast data is not served. As a result, diagggui |
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Tue Jun 10 12:11:14 2025, Pooyan, Update, CDS, CDS update
|
The MEDM models issue was fixed. The issue was that building the c1msc model alone was not enough and we had to re-build the c1iop as well, although
no changes has been made to the c1iop. Added a note in the wiki on this for future reference.
For
writing the fast channels to the frame files, our CDS system should have a GDS broadcaster. I followed this |
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Wed Jun 11 16:19:37 2025, Pooyan, Update, CDS, CDS update
|
Fast channels recorded to .gwf frame files
Had to add a DAQ Channels block to the c1msc model for those channel to be recorded in the
.gwf frame files. The block is in the CDS_PARTS, and I just had to copy it to our model. Here is the example text for the channels: |
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Tue Feb 13 01:26:30 2024, Peter, Update, Interferometer Simulations, CARM Power Simulations
|
Cao's simulations of the circulating power and gouy phase through a single arm cavity of the interferometer have been reproduced. Images of the plots can
be shown in the pdfs attached. There are approx. 400 lines in this code (scenario_3_carm) that produces these plots. This code also calls on a separate
code source file (thermal_models) that defines many of the functions used in this main simulation. The thermal_models file consists of over 1000 lines. |
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Wed Aug 9 17:35:26 2023, Shane, Update, CDS, Binary output chassis finished
|
Finished the internal wiring for the binary output chassis today, which completes its assembly. Also secured ribbon cables and chassis lid with their respective
screws. Note: one of the spade lugs' internal metal piece is a little loose and had to be reinserted after falling out once. Seemed secure after this,
and I checked continuity on everything and it was all good. |
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Wed Aug 16 17:17:02 2023, Shane, Jon, Update, CDS, Binary input chassis powering correctly
|
Binary input chassis passed power-on test, and is lighting up as expected. Binary output chassis also successfully powered on. AA and AI chassis not powering
on correctly, need to do some debugging to find the problem. |
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Tue Aug 8 17:03:22 2023, Shane, Jon, Update, CDS, Binary input chassis finished
|
Finished assembly of the binary input chassis today, including DC on/off switch and LED installation. external cable assemblies still needed, but internal
work done. |
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Thu Apr 16 14:04:46 2026, Mary, Update, Interferometer Simulations, Beam position optimization algorithm
|
| |
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Thu Jun 18 12:36:46 2026, Mary, Update, , Beam position optimization algorithm
|
| Slides |
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Thu Jun 25 11:42:29 2026, Mary, Update, TCS, Beam position optimization algorithm
|
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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Mon Mar 10 21:32:29 2025, Nathan, Physics, Electronics, Beam Profiling and PBS Measurements
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Beam wasn't diverging, however maybe was about to diverge when measurements stopped? Will discuss the PBS measurements and how the voltage changed due to
the wave plate. |
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Thu Sep 10 13:05:47 2026, Cynthia, Update, Interferometer Simulations, Beam Miscentering PRG Distribution
|
generated the global optimum PRG, thermal actuator powers for FROSTI Dual for a few points (only 5 y beam position finished running so far but the plot
can be generated actively as each new beam position finished running) with the particle swarm code. Only beam is moved around, no point absorbers.
Unsure
if the modes can be kept "even" once point absorber and mis-centering is introduced when locking the interferometer in the simulation when simulating quantum |
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Thu Apr 27 09:48:34 2023, Aiden, Summary, General, Batch 12 Bagging
|
I took batch 12 out of the oven and put them in a bag and placed the bag inside the clean room in the first large stainless steel container.
I also looked
at the small gauge that we felt like needed to be baked and I can confirm that without further cleaning around the inside of the gauge it should not be
connected to the main vacuum. I have attached a photo of the inside of the gauge. |
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Tue Feb 11 08:07:02 2025, Luis, Update, VAC, Bake stopped
|
[Luis, Ma]
Feb/10/25 4:00pm
Bake was stopped. |
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Fri Feb 16 18:37:28 2024, Jon, Update, VAC, Bake ended 6:23 pm
|
I ended the bake of the UHV system (that began on Monday) at 6:23 pm today by switching OFF both PID controllers. The heaters elements were run at max
power (24 V DC / 200 mA per element) during this bake, and I left them powered at the same level.
At the time, the instrument readings were as follows: |
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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 |
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Tue Feb 13 12:26:23 2024, Tyler, Update, Interferometer Simulations, BS Code Update
|
I reproduced Cao's CE beamsplitter code (see below for example plots). I received the current info on the beamsplitter parameters for A+ and A# from
GariLynn also. The next steps are to perform a similar power loss analysis on the anticipated A# beamsplitter. |
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Mon Jul 8 10:39:14 2024, Xuejun, Update, FLIR, Average Temperature Profile
|
After taking data for each of the individual heater elements, I imported them into python and overlayed them to produce an average temperature profile.
I rotated the 7 of the elements to align with element 1's profile and averaged them out. By setting the range to 28C - 33C (this gave the best visibility
of the heating pattern) it gave the profile attached. |
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Thu Aug 3 18:03:42 2023, Shane, Jon, Update, CDS, Anti-Aliasing chassis complete
|
We finished installing the internal power supply cables in the anti-aliasing chassis today, which concludes its assembly. Work on AI, BI, BO chassis still
underway. |