 Tue Jun 6 16:15:09 2023, Peter, Update, VLC Update, Launch Optics for Visible Light Cavity 
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I assembled the first few components of the launch optics for the visible light cavity. Below is an image of the current table configuration, and the image
is how the cavity will be oriented on the table. |
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Fri Feb 23 15:01:48 2024, Shane, Update, CDS, Latest draft of MEDM screen for FROSTI readouts
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Here's the latest draft of the MEDM screen for the FrOSTI temp and power readouts. Also, debugged the text readout boxes so they're now correctly reading
out the live temperature and power values. |
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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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Tue Apr 4 09:53:37 2023, Peter, Update, VLC Update, Laser intensity/polarization drift measurements
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The set up for the next round of beam characterization measurements has begun. The beam is initially passing through a half waveplate, is split at a polarizing
beam splitter, and then stirring mirrors are used to properly aim the beam into photodiodes (not yet installed). This is the current configuration of the
set up. |
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Thu Apr 6 10:20:43 2023, Peter, Update, VLC Update, Laser intensity/polarization drift measurements
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More optical components were added to the optical set up for laser intensity / polarization drift measurements. Both lenses and both PDs were added to the
configuration, as seen in the image below. The beam is already well aligned into the center of both of PDs, and focused nicely by the lens.
Both PD's
take BNC connecting cables, and the Red Pitaya takes SMA connecting cables. Since we are currently without a BNC to SMA cable, and we do not want to cut, |
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Fri Apr 28 11:21:01 2023, Peter, Update, VLC Update, Laser intensity/polarization drift measurements
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The Digi-key cables have arrived, and I have began implementing them in the intensity drift measurements.
There was a slight problem initially in connecting
the SMA to BNC cables from the photodiode to the red pitaya, since the red pitaya was way on the other side of the lab. Cao and I connected the red pitaya
to a new ethernet cable that extended far enough for the red pitaya to sit comfortably on the breadboard with the optics.
Right now the PDAs are not |
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Mon May 22 16:43:28 2023, Peter, Update, VLC Electronics, Laser intensity/polarization drift measurements
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In order to fully analyze the polarization data taken last Thursday, I needed to convert the signal output (which is in volts) to power (units of watts).
I used the power meter to accomplish this. Keeping the exact same configuration of PD's and beam splitting, opened the red pitaya's oscilloscope package.
I then took the power meter, and held it in front of the PD to measure the amount of Watts at each PD. I then wrote down the corresponding voltage being |
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Wed May 24 14:28:26 2023, Peter, Update, VLC Electronics, Laser intensity/polarization drift measurements
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I went in and took polarization drift data for 16 hours. The run started at 6:08pm and finished at 9:15am the next day. The four plots below are the same
plots shown for the 2 hour collection and previous trials, except they extend to 16 hours. The only one that is different is the Power vs. Time graph.
This is a graph of the actual incoming power of the laser (as opposed to the signal voltage that the PDA's output into the red pitaya). This was done using |
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Sat Feb 4 17:01:03 2023, Peter, Update, VLC Electronics, Laser Data
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Peter and Ryan took laser beam data. Configuration: 100mm focal length lens is ~100mm from lens. 150mm focal length lens is ~200mm from first lens. Beam
waist is ~420mm from second lens.
Beam waist is very small still. Had to input large amounts of error in data collection. Took width data successively
at points near waist and at >= Rayleigh range. Plots are shown below.
Key points:
Took a while to figure out optimum configuration for lenses to |
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Wed Mar 8 18:35:52 2023, Pamella, Update, , Lab cleaning
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Today Pamella finished cleaning of the cleanroom, starting with the HEPA vacuuming, mopping and clearing all floor with IPA wipes.
Also Pamella and Julian
finished cleaning of lab floor, starting with the HEPA vacuuming and mopping.
Shane and Pamella wiped down every surfaces of the laser table, computer
table and the table with the vacuum pieces inside the cleanroom.
Shane, Peter, Tayler, Pamella and Julian then wiped down every surface of the laser table |
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Tue Apr 11 17:56:15 2023, Pamella, Update, General, Lab cleaning
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Today Pamella and Julian finished cleaning of the cleanroom, starting with the HEPA vacuuming, mopping and clearing all floor with IPA wipes. Also we wiped
down some surfaces of the blue table, computer table and the top of chamber. |
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Wed Nov 8 17:55:49 2023, Jon, Update, General, Lab Clean-Up Day 1
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[Jon, Tyler, Shane, Peter, Luis]
Today we completed the first phase of lab clean-up. Activities included:
CF/KF parts stored under the cleanroom table were removed and transferred to Physics 1129
Cleanroom workbench cleared, with all |
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Tue Mar 4 03:05:42 2025, Xuesi Ma, Update, ELOG, LOG
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1424564097.243212 2025/02/26 00:14:39 UTC Time start
12V 2A right after start all 8 elements
1424564478.079428 2025/02/26 00:21:00 UTC Time stop |
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Mon Jul 31 12:39:01 2023, Shane, Update, Electronics, LED cable assemblies installed
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| Today I put together the two LED cable assemblies for the CyMAC and mounted them in the anti-aliasing and anti-imaging chassis. |
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Tue Jun 27 14:04:42 2023, Sophia A. , Update, Measuring Noise in Interferometer, Interferometer set up and connection to red pitaya
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Today we (Sophia and Tyler) constructed the set-up for the electrical noise calculation that I will be conducting this summer. I have included images of
the setup below. Our system is effectively a green laser, that feeds into a type of polarizer, then into a beam splitter which sends the laser light down
two arms into detectors. We started by connecting the detectors to an oscilloscope to determine whether the signal will exceed 1V, as the red pitaya (our |
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Thu Apr 27 16:23:44 2023, Cao, Pamella and Julian, Physics, VAC, Installing vacuum system (cont.)
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[Pamella, Cao and Julian, Shane]
Particles account
10:37 am: Starting the particles account
Zone 3:
0.3u: 1662
0.5u: 872
1.0u: 415
Zone 4:
0.3u: 831
0.5u: 124
1.0u: 0
11:14 am: Start removal of calibrated leak to install 45 deg elbow
11:21 am: |
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Mon May 1 17:10:25 2023, Julian, Cao, Physics, VAC, Installing Pirani gauge and RGA probe onto to vacuum chamber
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[Julian, Cao]
03:00 pm: Particle count
: Zone 3
0.3 um: 498
0.5 um: 124
1 um: 124
:
Zone 4
0.3 um: 748
0.5 um: 457
1 um: 374
03:32 pm: Installing Pirani |
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Mon Oct 3 17:21:39 2022, Cao, Update, TCS, Inspection of macor parts 7x
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The macor parts arrived and inspected today. These include:
Macor spacer (drawing: LIGO_Redesign_Macor_Spacer_Drawing_v4.pdf
attached below), quantities: 40
No defects, damages observed
Parts are free from grease/ machining fluid
Wall thickness
of 1 mm appear to provide sufficient stiffness to part
Images of parts: Macor_spacer_0.jpg, Macor_spacer_1.jpg
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Mon Jun 3 14:14:39 2024, Tyler, Update, FLIR, Initial CIT FROSTI Analysis
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[Tyler]
Attached below are the initial results of the CIT FROSTI testing analysis.
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Tue Feb 13 11:54:45 2024, Tyler, Configuration, FLIR, In-Air Optical Test Configuration
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Below is the proposed schematic for FROSTI optical testing, chosen so enough space is allotted for prototype assembly.
Steps to be taken include:
Reconstruct FLIR staging apparatus
Move test mass stand-in to cleanroom
Mark FLIR camera position on cleanroom |
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Tue Mar 19 10:55:30 2024, Tyler, Update, FLIR, In-Air Optical Test
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Below is an image I took using the FLIR just before leaving for the LVK meeting. The profile is roughly what we would expect (annular). Any distortions
seen are likely from the screen not being completely parallel to the plane of the FroSTI (i.e. the screen slightly bends in various locations). Next step:
In-vacuum test at CIT. |
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Tue Nov 5 11:08:40 2024, Luis Martin, Update, VAC, ISO Test
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[Luis, Luke, Ma Michael]
The isolation test was conducted on the vacuum system. Every pump was turned off under vacuum, and pressure measurements were taken
every minute for 15 minutes. The results are displayed in the sheet linked at the end of this report. The pressure of the main volume dropped very slowly.
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Tue Jun 21 18:31:49 2022, Cassidy and Phoebe, Update, Cameras, IR Absorbing Screen and FLIR Camera Setup
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Today we set up the IR absorbing screen and the camera on the optical table, as well as tested that the camera was functioning as expected (picking up heat
sources beyond the screen).
Screen Setup
The screen was set up by clamping it between two rectangular posts on each side. First, two posts
were set up with 22 in. between them (thus allowing the screen to span a total distance of up to 24 in. when clamped down). To best stabilize the screen |
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Mon Apr 3 17:04:05 2023, Aiden, Summary, General, IDP Scroll Pump Assembly
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Aiden installed the isolation valve and the exhaust silencer kits on the IDP-3 Scroll pump. The entire assembly still needs to be wiped down but overall
no residue came off when putting on the kits. |
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Sun Apr 10 15:39:49 2022, Rutuja Gurav, HowTo, Computer Scripts/Programs, HowTo: Renew the Let's Encrypt SSL certificate using certbot
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Port 80 is kept closed by default. This might be causing the certbot auto-renewal cronjob to fail. Therefore we must renew the certificate manually.
Step 1: Open port 80. (This is needed as the certificate renewal process runs some tests which requires client communication over |
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Sun May 14 15:50:48 2023, Cao, Infrastructure, Computers, High resolution display of logrus machine
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[Cao]
The display resolution of the logrus has been 1064x768 and has been the only option, which is not great. While remote access to logrus using
rdesktop allows rendering a virtual display of user's chosen resolution, it is not fast when using graphic-intensive program. NoMachine allows user to
take over and control the machine remotely and thus appears as the same machine. However, NoMachine cannot render a virtual display like rdesktop. This |
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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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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 Jun 14 15:35:36 2023, Pamella, Update, VAC, Heating system installation
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[Pamella and Cao]
Heating system installation - Second day.
Today we kept installing the equipment for the heating system.
First: Started installing the two heating cable around the chamber vacuum, the arms and covered it with aluminum tape.
Second: Started
installing the insulation stuff around the vacuum chamber and around the connections points (the arms) in the vacuum chamber.
Third:Started |
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Tue Sep 3 15:52:56 2024, Luke, Update, VAC, Heater tape initilization
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[Luke, Tyler, Jon]
On the 3rd we set up the pid controllers for the heater tapes and after putting on the insulation we started heating them up. We first brought
it to ~50C and let it stabilize, there was about a 6-7 degree difference between the RGA and the barrel temperature, with the barrel being higher. We then |
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Mon Jun 12 18:52:00 2023, Pamella, Update, General, Heater system parts - Wiped and bagged
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[Pamella]
Cleaning the heater system parts.
04:32 pm: Started wiping the heater system parts.
06:38 pm: Finished wiping the heater
and some parts to the system. I wiped, tagged and bagged the heater system, power cables, adapter cables and power connectors. Also I wiped, bagged and
tagged the aluminum foil tape.
06:43 pm: I putted all bags inside the cleanroom.
To do: I started but I was not able to finished |
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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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Tue Jun 13 21:08:46 2023, Pamella, Infrastructure, VAC, Heater system - Installation
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[Pamella, Cao and Jon]
Heating system installation
Today we started installing the equipments for the heating system.
First: Started installing the heating cable on the top lid and covered it with aluminum tape.
Second: Started installing the insulation
cover on top of the chamber lid.
Third:Started installing the heating cable from under the vacuum chamber and covered with aluminum tape.
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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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Mon Feb 5 14:17:52 2024, Aiden, Update, VAC, Heater Element RGA Scan
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Here are the new RGA scans for the powered Heater elements. The pressure at the time of taking data was 2.88 e-8 torr. The HC levels are at 40 e-10 torrl/s
which is not bad but still higher than the lowest we have recorded. |
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Thu Feb 8 17:37:48 2024, Aiden, Update, VAC, Heater Element RGA Scan
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Took more RGA data now that the heaters are powered by 18V. The pressure of the system during the data taking was 3.8 e-8 torr. The RGA scans seem to have
gotten worse as well with this power increase. |
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Mon Feb 12 17:35:47 2024, Aiden, Update, VAC, Heater Element RGA Scan
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Took more RGA data before and after increasing the heater elements to 300 degC and before heating them up.
Started Bake 11 as well to hopefully prevent any hydrocarbons from getting captured by the room temperature walls of the chamber. The PID controllers
were set to 100C. |
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Mon Feb 19 14:17:50 2024, Aiden, Update, VAC, Heater Element RGA Scan
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Three days after the completion of Bake 11, the Heater elements RGA scan looks much cleaner. The HC level is back down to 33 e-10 torrl/s with the pressure
at 2.13 e-8 torr. I could not take a= scan with the Argon closed as it was left open during the bake and not closed since then. |
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Fri Jan 31 15:03:09 2025, Xuesi Ma, Update, , Heater Element Circuit Check
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[Ma] Wed 1/29/2025 |
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Mon Jul 11 14:29:45 2022, Jon, Omnistructure, General, HEPA filter installed
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Today I unpacked and installed the new HEPA filter for the lab. It is an Omni CleanAir OCA1210 capable of 1200 CFM. This flow rate is sufficient to turn
over the air in the room once every 4 minutes, or 14 times per hour. Hopefully this will cut down on our particulate accumulation issues. |
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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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Wed Oct 2 10:31:46 2024, Xuesi Ma, Configuration, , Group Meeting Slides 10/2/2024
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Group Meeting slides for Non-deterministic Heater Response.
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 Thu Apr 27 21:43:07 2023, Jon, Physics, VAC, Grounding vacuum system
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This afternoon I made up a green 10 AWG grounding cable and connected it to the vacuum system.
One end is tightly connected to the bottom flange of the vacuum chamber (photo 1). It is run along and up the table framing to the top of the cleanroom,
where it exits into the overhead cable tray in the same location as the other power cables. It drops down from the top of the server rack all the way to |
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Fri Apr 28 18:16:57 2023, Cao, Physics, VAC, Grounding vacuum system
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Quote:
This afternoon I made up a green 10
AWG grounding cable and connected it to the vacuum system. |
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Tue Aug 1 16:22:35 2023, Celeste, Update, TCS, Graphical Updates to HOM RH Modification, Tuesday 8/1
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| Slides 20-33 are newly added (data/graphs from parameter sweep feature-1/8th heater unit length varied from 10% of original to 100% of original). |
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Fri Jul 28 17:45:45 2023, Celeste, Update, TCS, Graphical Updates to HOM RH Modification, Friday 7/28
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| Updated 1/8th Heater simulation modification graphs. Slides 7, 10, 16-19 are new additions. |
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Thu Jul 27 10:18:43 2023, Celeste, Update, TCS, Graphical Updates to HOM RH Modification
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| Attached are updated graphs of the irradiance distribution from the 1/8th ring heater units (extruded and reduced in length). |
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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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Tue Feb 20 11:31:49 2024, Tyler, Update, Cleanroom, Garment Cabinet Door Replacement
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[Luis, Luke, Pooyan, Tyler]
The replacement door for the HEPA garment cabinet arrived last week, and was installed on Thursday. However, it looks
like there's a small gap between the door and where the hinge is attached to the cabinet frame. No screws were provided with the replacement door. If we
want to perform any adjustments, we have to be very careful; the screws break very easily.
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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. |