 Thu Feb 27 18:22:21 2025, Shane, Update, CDS, Ongoing work in server rack and desk area (1119)
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As part of the vacuum communications debugging process, there is ongoing work in the server rack and desk area in 1119. Please be careful not to move any
of the materials left out in the server rack or on the work bench. |
Tue Feb 25 10:56:25 2025, Cynthia, Update, Interferometer Simulations, mirror coating added for simulation rerun 
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I have tried to rerun the simulation on finesse after adding the mirror coating. The result has a large fluctuation in required input power vs arm power
that is concerning. I am currently working on potentially resolve this issue and get a reasonable graph before I proceed to optimizing the thermal maps. |
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Tue Feb 25 10:02:32 2025, Xuesi Ma, Update, ,
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1424039912.625576 2025/02/19 22:38:14 UTC Time start
24V 2.8A right after start all 8 elements
1424044804.902443 2025/02/19 23:59:46 UTC Time stop |
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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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Mon Feb 24 17:50:13 2025, Luis, Update, VAC, RGA Scan
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[Ma, Luis]
February 24, 2025 - 1:00PM
Ma performed an RGA scan with the vacuum system containing the heater elements. The results are attached below. |
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Sun Feb 23 16:00:07 2025, Luke , Update, Scripts/Programs, Ringheater modeling Update
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These are some plots:
The first shows the convergence of the 02 mode reducing the size of the mesh. The second shows the the numerical error of the zernike.
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Sun Feb 23 12:11:43 2025, Luke , Summary, Cleanroom, Cleanroom cleaning
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[Luke, Mary, Luis]
Particle Count Measurements:
Pre-cleaning (8:40 am):
Zone 3:
0.3 µm: 441
0.5 µm: 44
1.0 |
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Thu Feb 20 17:07:36 2025, Luis, Update, VAC, RGA Scan
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[Ma, Luis]
February 20, 2025 - 3:30 PM
Ma performed an RGA scan with the vacuum system containing the heater elements. The results are attached below. |
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Wed Feb 19 13:44:48 2025, Shane, Update, CDS, Vac serial interfacing update
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[Jon, Shane]
Debugging update for vac system serial communications: we were able to successfully connect the smaller
turbo pump to the Varian (manufacturer) software today by plugging the controller db9 directly into spica, and verified that the pump was able to send
and receive information. Still no success on communication with the larger pump via python serial code, though. Issue potentially lies in the pinout mapping |
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Tue Feb 18 11:19:13 2025, Luke , Configuration, VAC, Repositioning of the lid's temperature probe
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Before the recent bake I slightly repositioned the temperature probe on the lid from beside the heater tape to under the heater tape. This was done to better
know and control the temperatures of the chamber while baking. It has appeared to work with the temperatures being held very close to the 120C target.
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Tue Feb 18 10:12:39 2025, Tyler, Update, TCS, Final RIN Plot Update
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Below is a preview of the final RIN figure that will be included in the FROSTI instrument paper. A quick summary of what is shown below:
The original RIN CSD measurement is shown on the top panel in red. Frequency bins that exhibit external electronics noise (ex. ADC, photodetector
noise, etc.) are identified and shaded in gray. These noisy bins are then excluded from the dataset before beginning the next step in the analysis process: |
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Tue Feb 18 10:02:16 2025, Xuesi Ma, Update, , Group Meeting Slides 2/18/2025
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| https://docs.google.com/presentation/d/1WiV2VqS0BzXNCK6VYYQ-Ty8xlHnzXatQaFbMf1-0rsY/edit?usp=sharing |
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Tue Feb 18 10:01:07 2025, Xuesi Ma, Update, ,
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[Ma, Pooyan, Tyler]
On Friday, we connected the vacuum chamber with the Cymac. |
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Sun Feb 16 16:45:18 2025, Luke , Update, General, Ringheater position optimization
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Over the last couple weeks I have been working on finding the optimal position of the ringheater's thermal profile.
Today I would like to give an update of where I am at and my next steps.
Using the python COMSOL interface I have been able to run and save deformation data sweeping through a great deal of potential combinations of |
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Fri Feb 14 12:15:23 2025, Luis, Update, VAC, Vacuum sytem staus
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[Luis, Luke, Ma]
February 12, 2025 - 4:00 PM
We performed an RGA scan with the vacuum system containing the heater elements. The results are attached below. |
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Fri Feb 14 11:57:50 2025, Luis, Update, VAC, Vacuum Update
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[Luis]
Feb/11/25 9:30am
Pressure gages were connected. |
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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 7 12:25:56 2025, Luke , Summary, VAC, Started bake
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[Luke, Luis]
The vacuum chamber is currently baking.
We stepped up to 120°C by increments of 30°C starting at 60°C. We took about an hour break at 90°C to let the temperatures equilibrate. |
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Mon Feb 3 13:17:21 2025, Xuesi Ma, Update, ,
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[Ma]
changed all zip ties to peek zip ties, and grouped wires together. The setup is ready to go into the chamber. |
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Sat Feb 1 17:25:52 2025, Luke , Summary, General, Cleanroom cleaning
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[Luke, Cece, Luis]
Particle Count Measurements:
Pre-cleaning (12:15 PM):
Zone 3:
0.3 µm: 1325
0.5 µm: 265
1.0 |
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Fri Jan 31 15:03:09 2025, Xuesi Ma, Update, , Heater Element Circuit Check
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table {
width: 100%;
border-collapse: collapse; /* Merges borders into a single line */
}
th,
td {
border: 1px solid #ddd; /* Adds a 1px solid border */
padding: 8px;
text-align: left;
}
th
{
background-color: #f2f2f2; /* Adds a light gray background to headers */
}
[Ma] Wed 1/29/2025 |
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Tue Jan 28 13:30:46 2025, shane, Update, CDS, Serial comms testing update
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Attempted to communicate with the smaller vac pump (TwissTor 74) via Agilent software today. Was able to communicate with the pump via python serial connection
code as usual, with no issues. When using the manufacturer software though, it was unable to 'locate' the pump and failed to connect to it. So manufacturer
software works for the big (older) pump, but not the smaller, newer one. Unclear if this is somehow related to the fact that using the manufacturer software |
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Mon Jan 27 23:35:28 2025, Xuesi Ma, Update, ,
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[Ma]
Installed all the pins to the peek DB 25 connectors |
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Mon Jan 27 11:29:38 2025, Xuesi Ma, Update, , Heater Element Test
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[Ma, Cece, Luke, Mary, Shane]
On Friday (Jan 24), we installed the heater elements on the stand. The heater elements are arranged from 1 to 8, oriented from right to left
as shown in Attachment 1. Each wire has been labeled according to its corresponding element number and type (e.g., RTD connections, heater connections). |
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Sat Jan 25 18:19:39 2025, Luke , Update, General, Ringheater modeling Update
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Here is a quick update on some of
the things I have been working on regarding my project. |
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Wed Jan 22 10:50:08 2025, Tyler, Update, TCS, FROSTI Disassembly
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[Tyler, Ma, Cece, Luis, Shane, Luke, Cynthia, Liu, Jon]
On Tuesday (Jan 21), we took the FROSTI apart in front of a filming crew. It was a success!
The footage is going to be used in an APS video detailing the experimental cosmology research conducted in the department.
The FROSTI reflectors, heater elements, and legs were all bagged separately and a currently being stored in the cleanroom. If you need to do |
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Tue Jan 21 10:12:02 2025, Luke , Summary, General, Frosti toy model
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[Luke, Liu]
Over the winter break I have been working on this desmos toy model of the Frosti. There
are still a few rough spots but I belive that it is a good visual representation of a 2D slice of the frosti. |
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Fri Jan 17 13:27:07 2025, Tyler, Update, TCS, FROSTI Pre-disassembly
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[Tyler, Ma, Cece, Jon, Luke, Cynthia, Michael]
On Tuesday, we prepared the FROSTI for disassembly in anticipation of the APS filming that is set to
take place in the labs. The FROSTI has been unbolted from the optical table in the cleanroom, with its wires weighted down and the majority of its screws
removed to ensure an easy removal of the reflectors during the filming process.
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Tue Jan 14 10:27:14 2025, Tyler, Update, TCS, RIN Updates
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[Tyler]
Attached below are updated plots for the FROSTI RIN measurements for Jan 14 group meeting.
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Wed Jan 8 17:35:57 2025, Luke , Summary, Cleanroom, Cleanroom cleaning
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[Luke, Tyler, Cynthia, Shane, Michael]
Summary of Cleaning Activities:
We began cleaning Room 1119 at 2:00 PM. |
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Thu Jan 2 17:52:58 2025, Luis, Update, VAC, MR Testing Continuation
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[Luis, Luke]
RGA Volume: T = 22°C, P = 2.10e-9 Torr
Main Volume: T = 21°C, P = 5.71e-9 Torr
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Mon Dec 23 14:33:36 2024, Tyler, Update, TCS, Latest RIN Measurement Results
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| Attached below are the measurements I took from the FROSTI from 12/18-12/22. |
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Sun Dec 22 20:43:35 2024, Luis, Update, VAC, MR Testing
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[Luis, Luke]
RGA Volume: T = 23°C, P = 3.0e-9 Torr
Main Volume: T = 22°C, P = 9.90e-9 Torr
After letting the vacuum cool down for a couple days, we reattached the magnets and sensors, then we performed a RGA scan of the vacuum system, |
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Thu Dec 19 12:00:44 2024, Luke, Update, VAC, End of bake
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The vacuum chamber has stopped baking.
Current state as of 11:40, 12/19/2024:
The gate valve is open, and the filament of the RGA is on. |
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Wed Dec 18 15:41:56 2024, Tyler, Update, TCS, FROSTI RIN
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[Tyler]
I have begun the (hopefully) final RIN measurements at 3:30 PM today. If you need to go into the cleanroom at any time between now and Sunday
(the 22nd), please do not touch the FROSTI, the Red Pitaya, the photodetectors, or any of the wiring. |
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Tue Dec 17 13:53:53 2024, Luis, Update, VAC, Vacuum system status
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[Luis]
The vacuum system is being baked. I disconnected the digital gages and the magnets, opened the Ar leak and started the bake by taking
the temperature from 60C-90C-125C waiting about 15-20 minutes between each interval. The RGA electronics were left on since the temperature of the flange
was 36.6C (bellow the 60C threshold) |
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Mon Dec 16 21:32:21 2024, Luis, Update, VAC, MR Testing
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[Luis, Luke]
The MR material was placed in the vacuum chamber following standard procedures to ensure the vacuum remained as clean as possible.
During this process, we only opened the main
volume while keeping the gate valve between the two volumes closed to maintain the UHV in the RGA section.
An
RGA scan was taken before this process, this will be used to compare the state of the vacuum with the sample inside to determine whether the MR material |
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Sat Dec 14 07:58:25 2024, Luis, Update, VAC, Vacuum sytem staus and Viton O-rings
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[Luis]
RGA Volume: T = 23°C, P = 1.71e-9 Torr
Main Volume: T = 22°C, P = 5.71e-9 Torr
On 12/13 I took another RGA scan to verify the state of the vacuum system and to see whether the degassing of the filament had worked. The |
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Thu Dec 12 13:06:39 2024, Luis, Update, VAC, RGA Scan and vacuum system updates
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[Luis, Luke]
RGA Volume: T = 21°C, P = 1.74e-9 Torr
Main Volume: T = 22°C, P = 5.60e-9 Torr
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Wed Dec 11 16:06:05 2024, Luis, Update, VAC, RGA Status
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[Luis]
I rebooted Spica and I was able to connect the RGA again. After Connecting the RGA, I left the filament on. |
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Wed Dec 11 13:39:30 2024, Tyler, Update, Electronics, RIN Update 12/11/2024
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[Tyler]
Attached below are updated ASD plots for the FROSTI RIN measurements. The parameters set for this are the following:
DFT Size (N): 16384
Sampling Frequency (F_s): 7.629 kHz
Resolution (F_s/N): 0.93
CH0 DC Voltage w/FROSTI
ON: 113.6 mV
CH0 DC Voltage w/FROSTI OFF: -5.7 mV
CH1 DC Voltage w/FROSTI ON: 113.0 mV
CH1 DC Voltage w/FROSTI OFF: |
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Thu Dec 5 10:31:13 2024, Luis , Update, VAC, RGA Scan and RGA updates
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[Luis,Shane]
An RGA scan was taken on Dec 4th. The results are attached at the end of the e-log. As we can see, the scan results are under
the allowed limits. After the scan, Shane and I worked on the vacuum connections. The filament was turned off, and the RGA was disconnected from Spica. |
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Wed Dec 4 16:01:23 2024, Shane, Update, CDS, Vac serial interfacing troubleshooting update
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Update on the issue with serial interfacing for the TV 551 turbo pump: Tried a new test today, to see if the commands being sent to the controller were
actually getting through at all, since we know that no response is getting back to us. To test this, I sent the start/stop command for the pump, disconnected
the serial connection and instead connected the controller to spica so I could run the manufacturer's software, and used the manufacturer's sotware to |
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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. |
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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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Sat Nov 30 12:41:42 2024, Luke, Update, VAC, Vacuum bake end
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The vacuum chamber has stopped bakeing.
Current state as of 12:10, 11/30/2024:
The gate valve is open, and the filament of the RGA is on. |
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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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Wed Nov 27 13:48:01 2024, Tyler, Update, Electronics, RIN Update
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[Tyler]
I downgraded the Red Pitaya back to OS 2.00-18 due to runtime errors during measurement. Once I did this, the device appeared to work much
better than it has the last few weeks. First, it appears we can actually see the cutoff of the added low-pass filters that were added in to the RIN setup.
Second, there does appear to be a difference again between the FROSTI ON state versus the dark state (i.e. FROSTI OFF). A long measurement of the ADC noise |
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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 20 12:59:37 2024, Tyler, Update, Electronics, RIN Update
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I went ahead and compared the noise spectrum of the ADC to those of the photodetectors with the FROSTI on and off. As discussed last meeting, it looks like
the measurements with the Red Pitaya (RP) are limited by the ADC noise floor. Another avenue to explore in this measurement could be switching to the
cymac ADCs. |