 Thu Jan 29 12:46:22 2026, Cece Ochoa, Update, , CE Cavity Design Update (4)
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Update for CE Cavity Arms + Modes
https://docs.google.com/presentation/d/1-dXYylkAbNpHR4WVCx9Q8ryL_xGlH-JSSLXEUQg6b7Q/edit?usp=sharing |
Tue Jun 3 11:54:06 2025, Cece Ochoa, Update, , CE Cavity Design Update 
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| 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
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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
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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 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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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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Tue Jun 3 11:50:08 2025, Pooyan, Update, CDS, CDS update
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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
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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
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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
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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
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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
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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
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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
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| Slides |
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Thu Jun 25 11:42:29 2026, Mary, Update, TCS, Beam position optimization algorithm
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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 Apr 27 09:48:34 2023, Aiden, Summary, General, Batch 12 Bagging
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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
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[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
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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
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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
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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
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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
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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. |
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Thu Jul 13 15:31:21 2023, Jon, Update, General, Ant traps placed around lab
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In response to reports that ants have been observed in the lab, I placed five ant bait traps around the room today. Each is sitting on the floor on top
of a piece of aluminum foil, in areas unlikely to be inadvertently stepped on. They contain liquid which will spill
out if picked up, so please take care not to disturb them. |
 Thu Jul 13 16:59:03 2023, Jon, Update, General, Ant traps placed around lab
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Update: After seeing the strong response to the first set, I redistributed them to the hottest spots and added one more trap.
Quote:
In response to reports that ants have been observed in the lab, |
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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 Apr 4 16:43:53 2023, Jon, Update, VLC Electronics, Additional Thorlabs PDA10A2
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I ordered a second PDA10A2 and mounting post + spacer (which puts the aperture at the VLC's standard 3" beam height). These arrived today and I delivered
them to the lab. They are sitting on the VLC table near the laser. |
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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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Mon Jul 3 16:26:21 2023, Cao, Infrastructure, DAQ, Access and control Red Pitaya remotely and run it on local machine
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[Cao]
To access and control the Red Pitaya using Python locally on a machine within the local network, one should follow these steps:
Start the SCPI server. This is achieved by first log onto the Red Piatay page
rp-xxxxxx.local/
Go to Development >> SCPI server and turn the server on. (Note : The server is currently running)
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Tue Jul 9 18:19:50 2024, Shane, Update, CDS, ADC-DAC loopback testing and IOLAN installation
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[Shane, Jon]
Finished ADC-DAC loopback testing today (see attached xlsx file or access directly here).
All looks well with the first 8 channels, with the gain hovering just under 2. Also edited c1msc model in simulink to add channels 7-15 (the last 8 channels),
and changed the rate back to 64K. See image 1 for the updated c1msc model. The last 8 channels are also looking good and show no problems, with slightly |
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Tue Jul 16 18:43:07 2024, Shane, Update, CDS, ADC-DAC loopback testing and IOLAN installation
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UPDATE:
Follow up ADC-DAC loopback testing now complete, matching all the ADC channels to a single DAC channel, and then matching all the DAC channels
to a single ADC channel (see attached xlsx file or access directly here).
Also note c1msc model file has been updated to include the second set of 16 ADC channels. The newly added channels also have their own filter modules, |
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Mon Dec 4 21:27:53 2023, Shane, Update, CDS, ADC-DAC loopback test results
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Here are the test results from today's ADC-DAC loopback tests. Channels 14 and 15 were the only ones behaving abnormally. Not sure what the issue is, but
needs further debugging. The DAC output was as expected for both of them, but the corresponding ADC inputs were the same regardless of what offset was
used (hovering around values of -4 and -5). NOTE: all measurements listed in the attached table are 'averages' in the sense that the ADC inputs and DAC |
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Thu Jul 27 14:46:55 2023, Shane, Jon, Update, Electronics, AA chassis DC on/off switch assembled
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| Made the first DC on/off switch assembly today and installed in anti-aliasing chassis. Second switch assembly to be completed later. |
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Fri Oct 27 15:28:30 2023, Shane, Update, CDS, AA and AI chassis for CyMAC powered on and functional
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CyMAC updates: Switched out the faulty power regulator boards in the Anti-Aliasing and Anti-Imaging chassis. Both chassis are now powering up correctly
with lights on and the correct voltages in/out of the power regulator board. Images attached. All chassis for the CyMAC now functional, so next step is
mounting everything in the rack. |
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Thu Apr 9 12:40:24 2026, Xuesi Ma, Update, TCS, A# Ring Heater Design
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Slides discussing for A# Ring Heater
design.
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Tue May 13 12:41:06 2025, Tyler, Update, TCS, A# Profiles Update
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| Slides on the A# ITM FROSTI profile modeling efforts can be found here. |
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Wed Apr 1 15:02:30 2026, Tyler, Update, TCS, A# FROSTI Profiles Optimization 04/02/2026
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Slides discussing SURF, OPD, and SURF+OPD
optimizations for idealized FROSTI A# profiles.
Quote:
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Thu Apr 16 13:14:42 2026, Tyler, Update, TCS, A# FROSTI Profiles Optimization 04/02/2026
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Slides discussing including overlapped
irradiance profiles at the center of an A# ITM.
Quote:
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Thu Mar 5 13:01:14 2026, Tyler, Update, TCS, A# FROSTI Profiles Optimization
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Slides
discussing updates on FROSTI A# profile optimizations. In particular, a new RMS function is defined which reduces inner-radii wavefront error variation
to a greater degree.
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Thu Jan 15 12:52:58 2026, Tyler, Update, TCS, A# FROSTI Profiles 01/15/26
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| Slides |
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Wed Jan 28 11:29:30 2026, Tyler, Update, TCS, A# FROSTI Profiles 01/15/26
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Quote:
Slides
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Thu Feb 5 13:12:28 2026, Tyler, Update, TCS, A# FROSTI Profiles 01/15/26
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Slides updating progress on FROSTI
A# irradiance profiles and reflector design. Edge roll-off is now included for thermoelastic deformation corrections.
Quote:
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Thu Feb 19 12:59:47 2026, Tyler, Update, TCS, A# FROSTI Profiles 01/15/26
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Slides covering a new approach
to optimizing for A# FROSTI profiles. In particular, we start looking at just optimal RH correction. Once this profile is determined, we then minimize
the residual further with FROSTI profiles.
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Tue Jul 1 12:39:42 2025, Tyler, Update, TCS, A# FROSTI Profile Optimization Update
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[Tyler, Liu]
Slides |
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Tue Aug 19 12:33:59 2025, Pooyan, Update, TCS, A# BS Update
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Tue Aug 15 16:10:06 2023, Celeste, Update, TCS, 8/15/2023 Simulation Progress
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Fri Aug 11 10:57:20 2023, Celeste, Update, TCS, 8/11/23 Simulation Progress
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