 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. |
 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 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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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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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 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 |
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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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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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Wed Mar 1 21:27:20 2023, Jon, Infrastructure, Cleanroom, Over-table shelf height raised
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Jon, Cao
Today we raised the height of the shelf overhanging the cleanroom laser table by 8 inches. This was done to create more vertical clearance between
the top-loading vacuum chamber and the bottom of the shelf. The added clearance should make both removing the chamber lid and inserting large parts easier. |
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Mon Jan 23 17:26:15 2023, Peter Carney, Update, General, Oven cleaning
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Aiden and Cao
Turned on the oven to 120 deg C for 12 hours. After 12 hours, put it at 200 deg C for 48 hours. |
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Thu Jan 26 18:58:25 2023, Aiden, Update, General, Oven Heating
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| Aiden cleaned the oven with methanol again and set the oven to 260 degC for 12 hours. |
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Fri Feb 23 18:03:27 2024, Tyler, Update, FLIR, Optical Test Setup in Cleanroom
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[Tyler, Xuesi]
The FLIR and test mass stand-in have been transferred into the cleanroom. A software test will be run as soon as we get an ethernet
cable long enough to reach into the cleanroom where the camera is set up. Once this is finished, the FLIR will be moved aside for construction of the FROSTI!
When completed, the camera will be placed back into position for in-air optical testing.
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Tue Jul 26 14:10:35 2022, Cassidy, Update, Cameras, Optical Post Replacement and Realignment
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Today I replaced the 3" optical post that the camera rests on with a 2" optical post in order for the screen to correctly fill out the camera's FOV. The
3" post is now in the glass optics cabinet next to the FLIR camera configuration box, wrapped in the protective materials from the 2" post for safekeeping.
There were no issues with the physical replacement of the post, except that the fork clamp on the post needs to be on one of the perpendicular, |
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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. |
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Mon Aug 12 17:09:04 2024, Cynthia , Update, Interferometer Simulations, O4 vs O5 cavity scans with ITM plume guess or ETM
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So far the proposed solution for what to use for O5 ITM mirror for SIS simulations is either the plume guess file or using the O5 ETM mirror for ITM. I
had ran a cavity scan for both of these possibilities and it seems like the results produced are fairly different. The next step is most likely moving
on to adding the Frosti effects including both of the proposed possibilities, and before this, a few confirmations and verifications are needed using similar |
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Mon Jul 1 15:19:42 2024, Cynthia , Update, Interferometer Simulations, O4 and O5 mirror cavity scans with thermal effect
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Thu May 15 12:03:41 2025, Xuesi Ma, Infrastructure, Electronics, Notice
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All Sorensen power supplies are turned off. The Cymac system is down (All Chassis are down)
If you need more information or if you need to turn them back on please contact Xuesi Ma. |
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Tue Apr 11 13:15:40 2023, Cao, Infrastructure, Clean & Bake, Nitrogen gas tank replaced
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The nitrogen gas tank has been replaced with a new unit. The new tank is ultra pure nitrogen (>99.9% nitrogen).
The new tank has been placed and secured
to the rack where the old one is; cap is removed and regulator is reinstalled onto the new tank. |
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Fri Feb 10 16:34:45 2023, Huy Tuong Cao, Infrastructure, Clean & Bake, Nitrogen gas tank ready to use
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Cao,
Today I fixed the final bit related to the nitrogen gas tank, which is to apply sealing tape to M-NPT connector of the hose to prevent
leakage
(file: AirGunSealed.jpg)
After application of the tape, no audible leak can be heard from connection between the hose and the air gun. |
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Fri Jul 26 17:25:42 2024, Jon, Infrastructure, Computers, New workstation ws4 installed in 1129
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Today I installed the second desktop workstation in 1129. The new machine is an Intel NUC13ANHi5, with a 12-Core Intel i5-1340P CPU, 32GB DDR4 RAM, and
a 1TB SSD.
I loaded it with a fresh installation of Debian 12 and installed the LIGO CDS workstation (control room) tools. It is assigned the hostname ws4 |
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Thu Jun 20 18:01:11 2024, Jon, Infrastructure, Computers, New workstation ws3 in 1129
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I have repurposed a spare Intel NUC to serve as the first of two planned workstations in 1129. Today I set it up with a fresh installation of Debian 12.5,
assigned it the static IP address 192.168.1.15, and installed the LIGO CDS workstation packages. It is assigned the host name ws3.
Temporarily, the
mouse is borrowed from ws1 in 1119. We need to order another mouse as well as a 25-ft Ethernet cable for connecting the workstation to the 1129 switch, |
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Wed Jun 26 15:33:41 2024, Jon, Infrastructure, Computers, New workstation ws3 in 1129
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Set-up of the first CDS workstation for 1129, ws3, is complete and the machine is ready for use. The login credentials are the same as the other lab
machines.
All that now remains is to install a permanent cable tray for running the new Ethernet cables between the electronics rack and bench (they are |