 Tue Jun 20 17:28:23 2023, Pamella, Update, Electronics, Heater system parts - Wiped 
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[Pamella]
Heating system
Wiping the heater system parts.
04:37 pm: Started wiping the electronic device
part for the heater system (HL101 Series Digital Benchtop temperature limit control).
05:19 pm: Finished wiping the parts to the heater
system (HL101 Series Digital Benchtop temperature limit control). I wiped the HL101 Series Digital Benchtop temperature limit control and I didn't bagged |
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Fri Jun 23 15:47:06 2023, Pamella, Update, FLIR, Collecting data - Moving horizontal and vertical on screen. 6x
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[Pamella]
02:09 pm: Turned on the device (current on)
02:42 pm: Started taking snap on position one (Reference point: 0,-0.062).
Parameters:0.10A,1.5V,41.5C
I took multiplier snap on the same position for compare after on data analyzes. I just wanted one/two minute
break between the snaps. I did that same for every position.
02:55 pm: Started taking snap on position two (Reference point:-0.10,-0.062 |
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Tue Jun 27 15:18:26 2023, Pamella, Update, FLIR, New data collection
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[Pamella]
Yesterday, I did a new data collection. I could get a better data in this time and I realized than I need use some
angle on the reflector for got a better shot. I need do that because the FLIR camera just is able to get the triangle shape for complete if I keep exactly
in same line for center point on the camera but for the data now I need move the refletor to go up and go down. So wasn't working very well if I keep the |
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Fri Jun 30 15:57:28 2023, Pamella, Update, FLIR, Data and python code update
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[Pamella]
Updates: Problems with the emission intensity and python code.
Yesterday I was working on get data from FLIR
reflector but unfortunately we got some problems:
I realized than if I move the reflector a to left or right the screen
doesn't get data very well(I attached a photo below). This is a problem because our idea is have the same type of emission every part on screen. Tyler |
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Fri Jun 30 16:43:14 2023, Pamella, Update, FLIR, Updates: Small moving the FLIR camera
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[Pamella]
Today, I was able to make some adjustments to the FLIR camera angle, suggested by Dr. Richardson, and we got small possible movements
keeping the same pattern in the shapes of the triangles. I have attached photos below. I was able to move left and right as well as up and down and it
worked in four points that I marked on the table.
The only problem is that it only worked on a part of the screen, if I try to place it farther |
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Mon Jul 3 18:38:13 2023, Pamella, Update, FLIR, FLIR project
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[Pamella]
I was able to work on the python code to do analysis on the FLIR-Reflector data.
I could plot images of total area (Tyler
help me on that) with csv file and also could have isolation area for triangles. I have attached examples below. Just for now the images are of different
data, so there are some differences in the shapes.
I'm working on getting a complete analysis code to work with the different positions of the |
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Tue Jul 4 15:35:38 2023, Pamella, Update, FLIR, FLIR - reflexion problem
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[Pamella]
I was testing all the positions we need to cover when moving the FLIR camera or the reflector. I tried to find out more about the problem so
I tested the position without the mask, just with the old bridge and I got the same problems, in the middle of the screen we have a very good image but
if we move we have the visualization problem and we don't see the reflection very well (intensity, emissivity) in FLIR.
For this test I used very low |
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Thu Jul 6 18:03:19 2023, Pamella, Update, FLIR, FLIR project - New configuration
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[Pamella]
Cao suggested using the project without the reflector and mask because in this case we probably got good images around the screen. So I started
this yesterday and today I started to get some data to see the stabilization position and check how the parameters fluctuated. I was looking and taking
snaps for an hour and a half. I'll repeat this one more time to make sure we have enough data to do analysis.
To do: The next step is to start |
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Sat Jul 8 14:26:17 2023, Pamella, Update, FLIR, Data with the new configuration without the mask and reflector. 6x
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[Pamella]
I started collecting data by moving the camera FLIR and covering all six positions on the screen (2x3). I was looking and taking snaps for more
than one hour and a half. I'll repeat this one more time to make sure we have enough data to do analysis.
I attached snap data below. This images is
processed on python code. |
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Fri Jul 14 16:49:42 2023, Pamella, Update, FLIR, New bridge and calibration data
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[Pamella]
Aiden 3D printed a new bridge for the heater and I installed the new bridge yesterday.
I started collecting data to plot
a calibration with the heater. I'm doing measurements with current and the thermocouple (thermometer) to compare with FLIR measurements and have a good
calibration. |
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Sun Jul 16 15:21:56 2023, Pamella, Update, General, General update about some problems in the lab.
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[Pamella]
General information about the lab facility.
Changed sticky floor mats, because close to entrance the cleanroom,
both sticky floor had a many died ants on top.
The light on top of the internet cable bridge is burned out.. I just saw this today but I am
not sure if was like this before.
The ant bait traps seem very efficient and right now only a few ants are running around in the lab, most are |
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Mon Jul 17 11:46:24 2023, Pamella, Update, FLIR, Thermocouple plot.
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[Pamella]
I collected data to plot a calibration with the heater. I took measurements with current and temperature (the thermocouple - thermometer)
to compare with the FLIR measurements.
I made a plot with this data and we can see how temperature vs current behaves.
Note: This data
I measured manually.
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Tue Jul 18 16:04:26 2023, Pamella, Update, FLIR, Setup FLIR with black wall (black body)
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[Pamella]
Today I tried get data the heater with the black screen but doesn't looks possible have just one "energy" point straight to FLIR camera.
Tyler and I tried different current and temperatures but keep very bad data. I attached a snap below.
I attached a photo about the new setup
below. The FLIR is in the most close point possible/safety with the heater. The heater is very close to the black wall but is not touch the screen so is |
 Tue Jul 18 16:12:27 2023, Pamella, Update, FLIR, Thermocouple plot.
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I noticed that these measurements have some issues with the weather on different days. We can see in the photo attached below how different the
temperatures are on different days, I took the data with the same procedure every day, but we can see the differences between them.
To Do: I
will do a new data collection using FLIR and thermocouple at the same time to plot comparison between both.
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Tue Jul 18 16:35:06 2023, Pamella, Update, FLIR, Plot-Data with the new configuration without the mask and reflector.
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[Pamella]
I was able to plot the first graph for a result between the six different positions on the screen, for now we can see the behavior
of the heater temperature in a Gaussian graph with combination data between the six files.
To do: Tyler gave me some ideas today to improve
the plot. So I'm going to change the code to have insulation on the values for just the heater ("insulation") and I'm going to plot after this insulation |
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Wed Jul 19 19:10:31 2023, Pamella, Update, FLIR, Data plot FLIR and updates. 8x
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[Pamella]
Today I was able to plot a graph for the isolation point on the center of the heater. I got data from six different positions on the
screen (I shifted the all coordinates). I extracted the data for the center point and plot the Gaussian with this extracted data for temperature. I attached
the all plots below
Also I took a snap using the black wall and with the heater at 120.1 C (0.30 A) try to have less noise but
we can see |
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Thu Jul 20 21:00:23 2023, Pamella, Update, FLIR, Data plot FLIR and updates about the black body
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[Pamella]
Today I got more data to plot the Gaussian. So I took more snaps in each position for the six different spots than we be using to have
a better calibration of the FLIR collected data. I attached the new plot below. Also, I did the same plot for each region as on the Elog 167 but I have
more than 20 pics because I was using a big number of data so I just attached one example below.To access the Elog, click |
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Fri Jul 28 18:03:07 2023, Pamella, Update, FLIR, Final plot - FLIR
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[Pamella]
I was able to plot the final result with the data to the heater. I attached below the "3Combined_HighTemp_Gaussian_Plot." in
this plot we can see better behavior on the Gaussian compared to the plot in ELOG 169, I was using the same data but with a different approach. On the
ELOG 169, we have the center point isolated data and this new plot is the temperature more than 70 C isolated because we have a very good heater temperature |
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Mon Mar 10 21:13:12 2025, Nathan, Update, VLC Update, PDH Lock Progress and Next Steps
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Progress update: Photodiode is set up, need to set up DC bias tee, EOM has 400-600nm wavelength range with a resonance frequency of 0.1-100MHz. Additionally
need to connect the DC bias to SR560, put it in low pass, then connect to the function generator and connect it to oscilloscope to observe. Once everything
looks good and working, need to connect the driver and we can start actuating on the cavity ETM. |
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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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Tue Apr 8 20:04:35 2025, Nathan, Update, VLC Update, PDH Lock Progress
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Connected the DC bias and mixer. Need to connect signal generator now to RF Amp and mixer, and also need to connect power supply. After that will see if
I can get a detection on the oscilloscope and if so will set up the driver. [Photos attached] |
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Tue Apr 22 13:00:04 2025, Nathan, Update, VLC Update, Photodiode signal check and additional signal check due to 20Mhz signal and amplifier
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In general, photodiode was able to achieve signal. Below are the voltage signals and frequency measurements of the photodiode with the dc bias and amplifier
connected to the EOM (Vpp = 2mV for first and Vpp= 1 for second). Also I need assistance in using the PZT driver. |
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Tue Feb 6 22:40:25 2024, Michael, Update, Scripts/Programs, Long Crab 1 Design Created In Gtrace
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Worked on and completed the python code for the simulation of the Long Crab 1 layout for Cosmic Explorer basing off of Pooyan's original work with the Crab
1 layout. From here I'll look into creating the shoelaces layouts. |
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Tue Feb 13 04:05:32 2024, Michael, Update, Interferometer Simulations, Shoelaces 1 Layout Simulated in GTrace
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I've worked on and have completed a first simulation of Cosmic Explorer's Shoelaces 1 layout. This is based off of Pooyan's original work with Gtrace much
like the Long Crab 1 layout I worked on last week. This layout will allow me to quickly created the alternate shoelaces layouts. I've included an image
of the dxf, and a desmos model for reference. |
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Wed Feb 21 23:15:07 2024, Michael, Update, Interferometer Simulations, Long Shoelaces 1 Layout Created in Gtrace and Fixed Ghosting in Beamsplitter
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I have created the long shoelaces 1 layout for cosmic explorer using gtrace, a slight modification from the shoelaces 1 layout design. I also modified the
simulation code slightly to remove ghosting effects in the beamsplitter. Originally the python code specified that the HR and AR sides of the beamsplitter
both have the same transmission/reflection. I modified this to the ideal case of: Refl_AR = 0, Trans_AR = 1. I have attached two images below to show the |
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Tue Feb 27 03:26:28 2024, Michael, Update, Interferometer Simulations, Reverse aLIGO Layout Created in Gtrace
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I've created the simulation for reverse aLIGO layout in gtrace. Attached are the desmos model and the output dxf file. From here Pooyan and I plan to create
a brief report of our progress to the CE optical design group. |
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Sun Apr 7 13:42:51 2024, Michael, Update, Interferometer Simulations, Update on status of gtrace project
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[Pooyan, Michael]
After meeting and discussing the current state of our work with Prof. Fulda a few weeks ago, we have decided that the best next
step for the gtrace project is its integration into finesse work. Our first step towards this integration involved creating a sequential beam trace in
contrast to the previous non sequential gtrace simulations. A sequential beam trace not only allows for faster runtimes of the simulation ( |
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Mon Jul 8 12:26:10 2024, Michael, Update, Interferometer Simulations, Minimizing Astigmatic Effects in the SRC of LIGO
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This is the first look and analysis of the effects of astigmatism in the aLIGO optical layout which can lead to mode mismatch and therefore increased losses
into higher order modes. Specifically I am currently looking at measuring the effect of changing the radii of curvature of the SRC mirrors https://docs.google.com/presentation/d/1qhIehqyNukg4g8S2fqfQZz83yr9aB76tEa6fn2J-TrM/edit?usp=sharing |
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Mon Jul 15 15:52:40 2024, Michael, Update, Interferometer Simulations, aLIGO locking with varying SRC mirrors and measuring mode mismatch
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Sun Aug 4 09:01:01 2024, Michael, Update, Interferometer Simulations, Update on SRC Mode Mismatch Analysis
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| An update on my analysis to minimize mode mismatch/scattering by introducing toroidal mirrors to the SRC. |
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Mon Sep 9 12:36:45 2024, Michael, Update, Interferometer Simulations, Update on Analysis of Mode Mismatch Minimization in A#
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I have taken a closer look at the solution curve in the mirror parameter space which I have searched, focusing on the "resilience" of specific points, with
the plan to analyze how certain conditions of the interferometer change as we move along this solution curve. |
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Mon Dec 2 00:11:23 2024, Michael, Update, Interferometer Simulations, Status Update on Toroidal Mirrors Project Work
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As it has been significant time from my last update on this project, I compiled a few notes about what I have been working on, current issues, and my future
plans. The past few weeks have been focused on me attempting to obtain a reliable symbolic expression for mismatch. This is important going forward as
it allows us to determine optimal points in the parameter space and the surrounding behavior efficiently without significant computational cost. However |
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Tue Feb 25 01:37:00 2025, Michael, Update, Interferometer Simulations, Updates and Current Next Steps for Toroidal Mirrors Project
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Since the previous discussion of this project, I've worked on building finesse models to verify mathematical results which model the astigmatism in a two
mirror system which we attempt to minimize. This left us with a single condition for an output non-astigmatic beam. However, as can be seen in finesse
simulations, there does exist other configurations which have a negligibly small astigmatism, which we may want to consider. Below I've attached the link |
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Tue Apr 8 00:17:01 2025, Michael, Update, Interferometer Simulations, Squeezing Performance Graphs for Case With and Without Toroidal Mirrors in LIGO
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I've created some graphs for the frequency dependent observed squeezing level in LIGO for both the nominal case and the case where we include toroidal mirrors,
giving some interesting results. https://docs.google.com/presentation/d/1RBr47hNaxFTdGrwys5ZCUEUOgVOVHmZ2B_5EQwY62IY/edit?usp=sharing |
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Mon Apr 21 16:56:42 2025, Michael, Update, Interferometer Simulations, Fixed Observed Squeezing Curve for Toroidal Mirror Case
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We've resolved the issue with the observed squeezing curve for the toroidal mirror case showing worse performance at lower frequencies and better performance
at higher frequencies compared to the nominal case. This issue was caused by the beam parameter at the squeezer being fixed before changing the radii of
curvature of the mirrors. This has been changed to be fixed after changing the mirrors, and we see an improvement in the toroidal mirror case. |
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Tue May 6 13:07:34 2025, Michael, Update, Interferometer Simulations, Initial Convergence Plots for Toroidal Mirrors Project
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Mon May 26 23:24:33 2025, Michael, Update, Interferometer Simulations, Initial Monte Carlo Simulations for Toroidal Mirrors Project
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I've run an initial Monte Carlo simulation for statistical comparison of toroidal mirrors for the dual FROSTI TCS case. Below is the link to the slides.
slideshow |
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Sun Mar 23 15:39:06 2025, Luke Johnson, Update, Scripts/Programs, Ringheater Location optimization
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Attached are some plots that show a new parameter sweep with a finer mesh then before. I have also been able to get a heatmap of power of HOMs in a very
simple finesse model. |
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Mon Mar 31 11:26:45 2025, Luke Johnson, Update, Scripts/Programs, Heatmaps of power delivery performance
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These plots show the required temperature to release 100W of power and the efficiency of a particular configuration with half-width w and distance away
from the barrel z. I want to add to these heat maps a limit line that has restricts the proximity of the reflectors from the barrel. |
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Mon Jul 15 13:30:49 2024, Luke , Update, VAC, Problem with 2.75" to 1.33" zero length reducer
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Last Friday while checking the depth of the ZLR I got one of the screws stuck. Today I tried a couple things to get it out. First I tried a few different
pliers to be able to grip lower on the screw this didn't work. So I switched to the other method of drilling a small hole to see if maybe the threads would
pull away from the walls of the hole a bit. This kind of worked as seen in the picture below I was able to remove most of the screw but there is a bit |
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Mon Aug 12 16:35:30 2024, Luke , Update, , Ringheater modeling Update
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Fri Sep 6 14:34:52 2024, Luke , Update, VAC, Heating tape work
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On the 5th I had tried to start baking the vacuum chamber however certain parts of the chamber were getting too hot and causing the controllers to shut
off. So I turned them off so that the next day I could rearrange the temperature probes. I then on the 6th set them up so that instead of overshooting
the temperature they would be a little low in places. |
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Wed Oct 2 12:05:42 2024, Luke , Update, , Ringheater modeling Update
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| Power point slides |
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Wed Oct 23 12:33:54 2024, Luke , Update, , Zernike calculation update
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PowerPoint slides new
PowerPoint slides older |
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Wed Nov 13 14:06:00 2024, Luke , Update, General,
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| slides |
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Thu Nov 14 10:46:20 2024, Luke , Summary, Cleanroom, Cleanroom cleaning
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[Luke, Luis, Michael]
cleaning cleanroom and particle count |
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Tue Nov 19 17:10:34 2024, Luke , Update, VAC, Leak check
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Chamber temperature: 23C
Chamber Initial Pressure: ~1.8e-8 main, ~3.5e-8 rga
Did another leak test after monday's work to check how the seal was holding up initial leak was 5.5e-9. I then tried to tighten the bolts a bit |
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Wed Nov 27 12:27:45 2024, Luke , Summary, VAC, Summary of vacuum work
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[Luke, Luis]
Update of current state of vacuum chamber
Current temp: 24°C |
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Wed Nov 27 16:23:58 2024, Luke , Update, VAC, Started bake
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[Luke, Luis]
The vacuum chamber is currently baking.
We stepped up to 125°C by increments of 30°C starting at 60°C. Everything went fine. After about 20 minutes of the PID controllers |
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Mon Dec 2 13:35:45 2024, Luke , Update, General, Clean and bake of Viton O-rings
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[Luke, Luis]
We couldn't access the bake log on the wiki. (see attached) So we looked in the documentation provided on the DCC to find at what temperature to
bake the Viton O-rings. We found that we should bake Viton at 180°C for 24 hours. |