 Wed Oct 9 13:52:31 2024, Tyler, Update, TCS, RIN Update 10/09/2024 
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I tried adjusting the gain settings on the photodetectors to check if this would help improve the RIN spectra measurements. Overall, it doesn't look
like it does, and if anything, looks worse. I assume this is so because as the gain is lowered, the amount of detectable signal from the FROSTI becomes
smaller and smaller. |
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Wed Nov 13 14:03:32 2024, Tyler, Update, Electronics, RIN Update
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[Tyler]
We've added two low-pass filters in hopes of reducing any potential aliasing that may be introducing additional noise into the power spectra
for the RIN measurements. It still looks like the noise levels are too high. Attached below are some recent measurements taken with the FROSTI powered
on and off.
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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. |
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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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Tue Aug 26 12:45:41 2025, Christina, Ma, Tyler, Update, CDS, RIN Update
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| Slides |
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Tue Mar 4 10:28:58 2025, Tyler, Update, TCS, RIN Plot Updates
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 Mon Aug 12 16:24:34 2024, Tyler, Update, Cleanroom, RIN Measurement Update 1
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[Tyler]
For some preliminary tests, I moved the IR photodetectors outside of the cleanroom and onto the other optical table. The basic goal was
to obtain a signal from both photodetectors. To achieve this, one of the heater cartridges used for early FLIR measurements months ago was hooked up to
a power supply (PS). The PS was set to supply 0.20 A with a voltage of 2.8 V; the corresponding power is thus 0.56 W. With this, I was able to measure |
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Mon Jul 29 14:30:16 2024, Tyler, Update, Cleanroom, RIN Measurement Set-up
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[Tyler]
I have begun moving parts into the cleanroom for the upcoming FROSTI RIN tests that will be conducted within the next few weeks. While waiting
for the rest of the equipment to arrive to perform the full-scale tests, I have additionally moved the FROSTI under the shelf above the optical table,
where it will stay for the meantime. As always, please use caution when in the cleanroom. Aside from the FROSTI, the IR photodetectors that will be used |
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Tue Sep 2 11:53:34 2025, Tyler, Update, TCS, RIN Infrastructure Update (09/02/2025)
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[Ma, Tyler]
Below are slides discussing RIN infrastructural updates related to the CyMAC.
Slides
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Tue Sep 23 13:10:07 2025, Tyler, Update, TCS, RH O6 Update 09/23/25
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| Slides |
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Tue Sep 9 12:06:38 2025, Tyler, Update, TCS, RH O6 Update
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| Slides |
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Tue Aug 12 13:28:00 2025, Tyler, Update, TCS, RH Fenicsx v. HV
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Thu Jul 11 15:53:39 2024, Luke, Update, VAC, RGA line upgrade
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[ Luke, Jon ]
Started work at 11:00
As mentioned in my previous post the RGA was not clearing the table because of a tilt in the cross. So I removed the 90 deg elbow, loosened the |
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Fri Aug 23 16:08:32 2024, Luke, Update, VAC, RGA line leak testing
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[Luke, Luis, Jon, Tyler]
On the 22nd Dr. Richardson showed Luis, Tyler and I how to preform a leak test with the RGA. We did the initiall test and found a few leaks two
were particuarly bad highlighted in orenge below. To try and remidy this we planned on replacing the copper gaskests on the leaking flanges. We then began |
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Tue Aug 27 15:01:26 2024, Luke, Update, VAC, RGA line leak testing
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[Luke, Tyler]
On the 27th Tyler and I ran the RGA leak test again with the electron multiplier on. These were the leaks we measured. The chamber's overall pressure
was at ~6e-8 torr. |
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Wed Jul 10 17:31:07 2024, Luke, Update, VAC, RGA line disassembly and upgrade
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[ Luke, Cynthia, Michael, Xuesi, Anthony ]
Started work around 12:45
We vented the chamber first and once it reached atmospheric pressure we started taking apart the RGA line. |
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Fri Nov 10 08:32:34 2023, Jon, Update, VAC, RGA experiments
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I ran a 3-minute degas cycle of the RGA filament for the first time yesterday (in this process, the filament gets very hot in
order to "boil off" settled particulate). I was surprised to see the pressure (of not just the RGA volume, but also
the main volume) rise from 2e-8 to 5e-6 torr.
This observation, |
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Tue Nov 14 17:21:40 2023, Jon, Update, VAC, RGA best practices
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As a follow up ELOG 261, I have received advice from one of the vacuum experts at LIGO Hanford
on best practices for our RGA:
For future RGA degassing, definitely keep the main volume isolated, since it |
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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 May 10 10:49:34 2023, Aiden, Update, General, RGA Software
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[Aiden, Cao]
Went over how to use the RGA software, how to change the graph units, scaling and mass detection. Also went over how to remove the RGA from
the vacuum system as well as procedure for turning it on. |
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Mon Sep 16 13:51:23 2024, Luis Martin, Update, VAC, RGA Scans
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[Luis, Luke}
Three RGA scans were taken. The improvement in the amount of HC in the vacuum is visible across the different measurements.
Images are attached. |
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Wed Sep 25 09:06:09 2024, Luis Martin, Update, VAC, RGA Scans
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RGA
Scan Comparison
The following images compare the RGA scans from 9/23/24, after the first bake with the new vacuum system,
with those from 3/14/24, after bake 12 with the old system. |
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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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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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Thu May 8 17:41:56 2025, Luis, Update, VAC, RGA Scan Post Bake
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[Ma, Luis]
After taking the RGA scans of the new system, here are the results of the raw and normalized data.We can see that in the post baked system
the He peak is way lower, and the peaks around 20AMU are also significantly lower. |
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Wed Oct 16 13:58:59 2024, Luis Martin, Update, VAC, RGA Scan
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The following figure displays data acquired on 10/09, and it shows that we are no longer below the cleanliness standard. Also, the system's pressure
went up to 1.9x10-8 Torr (approximately 7x10-9 Torr previously). This might be due to a leak somewhere in the system. More tests
will be performed later. |
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Wed Oct 23 12:08:36 2024, Luis Martin, Update, VAC, RGA Scan
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[Luke, Luis, Mary, Ma]
On 10/22/24 Luke, Ma, Mary and myself ran a RGA scan, the results are displayed below. The overall pressure of the vacuum was 2.0e-8 and the temperature
readings were 26C for the RGA and 25C for the main volume. |
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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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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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Wed Oct 8 14:45:12 2025, Xuesi Ma, Infrastructure, VAC, RGA Chamber Pressure
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| RGA Chamber pressure is currently at 3.68e-4 torr. |
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Wed Nov 6 13:48:55 2024, Liu, Update, Interferometer Simulations, QN modeling update
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| Slides |
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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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Thu Apr 17 12:12:29 2025, Liu, HowTo, Interferometer Simulations, Preventing Thread Contention in Multiprocessing with Finesse and Cython
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Avoiding Thread Contention When Using Multiprocessing with Finesse
and Cython
When running Monte Carlo simulations or other computational
workloads, it's common to use Python's ProcessPoolExecutor |
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Fri Oct 10 14:40:23 2025, Xuesi Ma, Update, VAC, Pressure gauge Swap
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[Tyler, Ma]
We are suspecting a pressure gauge problem. The electronic unit of the main chamber pressure gauge and the electronic unit of the RGA chamber
pressure gauge are swapped. |
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Mon Mar 10 17:03:52 2025, Shane, Update, CDS, Pressure Gauge successful connect
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Vac system serial interfacing update: the pressure gauge is now able to communicate successfully through the code. It's been set to a static ip of 192.168.1.30,
on port 8000. |
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Mon Nov 6 11:29:24 2023, Tyler, Update, Electronics, Preliminary RTD Calculations, RP Software Update
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Preliminary RTD calculations are shown below, given an input of 10 V and desiring a few mA of current. It looks like R_ref should be at least 1 kOhm
(refer to plots/circuit below), keeping in mind we need to have
RP: The Red Pitaya Software was updated to OS 2.00. All examples on the RP website should run without issue. |
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Tue Aug 1 12:48:41 2023, Aiden, Update, Cleanroom, Pre Filter Change
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Changed the pre filter inside of the 3 stage HEPA system next to the soldering station. It was rather dirty and I have attached images with a clean
filter on the left and the used one on the right. I reset the pre filter age on the system. I tried to see if I could tell if the HEPA filter was dirty
but I could not see it. I did not reset the age of the HEPA or UV stations. They are currently 378 days old.
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Wed Jun 28 15:58:56 2023, Shane, Cao, Infrastructure, VAC, Power trip problem remains, source of smoke is insulation
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[Shane, Cao]
With the new change in wiring configuration described in elog 136, we tried
to power up the heaters for baking the vacuum chamber again.
Given that we were worried about the turbo pump overheats, we set the setpoints of of bother high temperature controller and PID controller to |
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Tue Feb 20 08:01:30 2024, Jon, Infrastructure, General, Power and network equipment installed in 1129 rack
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[Jon, Tyler, Pooyan, Luis, Luke, Peter]
On Thursday we installed the power conditioning/distribution equipment and networking equipment in the new 1129
rack. The hardware is identical to the setup in the 1119 rack and includes:
Tripp Lite SU5KRT3UTF - 208V, 5kVA on-line UPS with 120V transformer
CyberPower PDU20M2F12R - metered power distribution unit, |
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Mon Jul 7 16:39:18 2025, Christina, Update, TCS, Pomona Box Drawings
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| Below are the drawings for the pomona box modifications |
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Tue Jun 3 12:16:13 2025, Cynthia , Update, Interferometer Simulations, Point absorber simulation on radially averaged profile
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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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Thu Aug 29 16:39:34 2024, Luke, Update, VAC, Photos of heater tape 6x
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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 Jul 15 13:13:48 2025, Christina, Update, TCS, Photodetector optical post assembly
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Tue May 9 15:49:20 2023, Jon, Infrastructure, VAC, Permanent cable routing
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Today I brought in a fresh supply of zip ties (we now have 1500 in the tool chest) and used them to permanentize the cable routing for the gauges, pumps,
and RGA.
I also brought and installed a 3-foot 15A extension cable for powering the scroll pump. Installing the cable required shutting down the pumps, |
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Mon Nov 28 18:10:23 2022, shane, Update, ELOG, Particle counts in the clean room
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Particle count stats for the clean room Nov 28, 2022:
Took 10 sample runs in each of 5 regions in the clean room (5 runs per region with a person inside
the clean room for the measurement, and 5 runs per region without anyone in the clean room for the measurement), for a total of 50 samples taken. Sample
time was 60 seconds. Overall clean room average particle count for the size ranges are as follows:
0.3 micrometers- 3405.76 (room occupied), 974.92 (room |
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Tue Apr 4 16:52:08 2023, Jon, Update, Cleanroom, Particle counter docking station
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Due to the problems we have encountered trying to serially communicate directly with the Met One DR-528 particle counter, I went ahead and ordered the add-on
communications/charging dock. The dock "ethernetizes" the serial communications by wrapping them in TCP packets and transmitting them over the lab network.
This will allow our Python code to communicate using the standard Internet sockets package, rather than PySerial, PyNut, etc.
the docking station arrived |
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Wed Apr 12 16:17:50 2023, shane, Update, General, Particle Counter moved
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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. |
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Mon Oct 9 11:29:37 2023, Tyler, Update, Electronics, PSD/CSD Plot Updates
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Continuing from Sophia's SURF Project this summer: Plotting the Power-Spectral Densities (PSDs) and Cross-Spectral Densities of two signals.
A continued
issue that has been observed in the plots is the random "jump" of one PSD curves. Below, a 1.4 kHz signal is driven with a magnitude of 0.7 Vpp, and connected
to the two output ports of the Red Pitaya via an SMC T-Adapter. At the moment, I anticipate that this bug might have something to do with the Real-Time |