 Wed Aug 9 11:32:56 2023, Jon, Infrastructure, General, New power cables 
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I delivered new NEMA 5-15 (120V / 15 A) power cables to the lab for the following items:
WS2 (cleanroom) cart - 10ft cable
Electronics workbench overhead LED - 10ft cable
Both PI heater controller sets - (2)
6ft cables
I installed the new cables on the WS2 cart and the workbench myself, and left the two 6ft cables (as pictured below) for Aiden |
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Fri Apr 25 19:18:10 2025, Luke , Update, Scripts/Programs, New optimization plots
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I have created two more plots. One on the transmitted power for a specific configuration. This was done by taking the product of the efficiency and the
power released by surface area of the source plane for a configuration assuming it is at 300C. The second is a plot of how close the reflector is to the
test mass I have included a contour line at 2mm the nominal proximity constraint. Both of these plots are generated for a 2cm wide target plane. |
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Sun May 11 19:36:42 2025, Luke , Update, Scripts/Programs, New optimization plots
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Slides
I have re-run the optimization plots with the changes mentioned last week.
I have added the heat maps of the HOM scattering from HR deformation and the HOM scattering due to the OPD difference as well as the curvature |
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Tue Jun 27 15:18:26 2023, Pamella, Update, FLIR, New data collection
|
[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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Tue Jun 13 21:33:46 2023, Pamella, Update, General, New cabinet for PPI
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[Pamella and Dr.Richardson]
Dr. Richardson installed the new cabinet outside the room for the PPI equipments, and then I wiped all surfaces inside
and outside of the new cabinet.
Dr.Richardson and I have finished organizing the PPI within the new cabinet. Also we have new supplies of gloves,
and will likely have more supplies for other PPIs soon. |
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Fri Jul 14 16:49:42 2023, Pamella, Update, FLIR, New bridge and calibration data
|
[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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Mon May 13 14:48:27 2024, Aiden, Update, VAC, New Vacuum Chamber Design
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I created a new model for the vacuum chamber based on the ideas from last week's meeting.
It should be noted that we can not have the zero length
reducer and the gate valve on the same arm as they both have blind tapped holes. We need to decide if we want the gate valve or not as if we do, we will
need to use the 3 inch long reducer.
Important Measurements:
From the back of the flange to the back of the RGA: 25.25 in
Height from |
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Mon Jul 8 17:01:45 2024, Shane, Update, CDS, New CyMAC internal layout
|
[Jon, Shane]
Internal layout of CyMAC has been updated (labeled image attached) to accommodate the replacement of the two ribbon cables. Looking down
on the chassis from the front, and going from left to right, the new placement is as follows: BIO card, DAC adapter board, ADC adapter board, DAC card,
ADC card. NOTE: As part of ADC-DAC loopback testing, we're disconnecting from the FROSTI readout chassis and using the cables to connect directly from |
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Tue May 30 14:51:27 2023, Pamella, Update, FLIR, New 3D mask - Bigger triangles shapes.
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[Pamella]
Change the 3D mask
Started removing the old mask in the reflector.
Started cutting the new aluminum lid for the
new 3D mask and assembling in the 3D mask.
Started doing the new cable connections for the light.
Started testing the resistance
in the new cable connections. The multimeter show us 14.2 Ω.
Started attaching the mask with the light and the thermometer sensor.
|
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Tue Jul 25 15:35:14 2023, Shane, Update, Electronics, More chassis moved
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Finished basic assembly of binary input and output chassis today, and moved one to top shelf of work bench. The other is in corner of work bench (image
attached). They are delicate, so please do not move them or place anything on top of them. |
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Wed May 3 19:03:47 2023, Julian,Pamella and Cao, Physics, VAC, Modify vacuum asssembly and install RGA
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[Pamella, Julian, Cao]
Today we started re-configuring the vacuum chamber components.
Particle count
10:45 am : Starting
the particle count in the clean room.
11:13 am : Finished the particle count in the clean room.
Zone 3 :
0.3 u: 2535
0.5 u: 1413
1.0 u: 789
Zone 4 :
0.3 u: 457
0.5 |
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Wed May 31 16:18:41 2023, Aiden, Summary, General, Mock FROSTI
|
| Finished assembly on the Mock FROSTI so it is ready for the fit test at LIGO lab. |
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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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Sat Feb 24 08:53:38 2024, Jon, Infrastructure, Computers, Matlab upgraded to 2023b on Chimay
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| I upgraded Matlab on chimay to the latest stable release, 2023b. From some quick tests, it appears to be in working order. Let me know of any issues. |
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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 16 21:32:21 2024, Luis, Update, VAC, MR Testing
|
[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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Sun Dec 22 20:43:35 2024, Luis, Update, VAC, MR Testing
|
[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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Tue Nov 5 09:56:04 2024, Luis Martin, Update, Clean & Bake, MR Bake
|
[Luke, Luis]
On Friday, 11/1/24, the MR was unpackaged and cleaned under the flow bench. We noticed an ink stain on one of the corners of the
material. After wiping it down with IPA and Vector Alpha wipes, the stain was removed. However, the material showed some wear.
|
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Mon Feb 19 14:40:21 2024, Shane, Update, CDS, MEDM screen for FROSTI temp readouts
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Here's the latest draft of the MEDM screen for the FROSTI heating elements' temperature readouts. Note that the MEDM screen isn't actually this grainy,
this just happens to be a photo of the lab monitor's screen off a phone. |
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Thu Feb 29 17:16:48 2024, Shane, Update, CDS, MEDM screen for FROSTI T/P readouts
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Here's the latest draft of the MEDM screen for the FROSTI temp and power readouts, now with a button linking to the c1msc file display. Size/color/label
are all changeable, if adjustment is needed. Checked in execute mode as well, and it's working correctly. Also noticed that the MEDM file name has been
changed to FROSTI.adl, which I'm noting here for future reference. Still in medm_sandbox directory. |
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Wed Jun 11 16:33:45 2025, Pooyan, Update, Computers, Luke's ray tracing hosting
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Hosted Lukes model on Chimay. It's available at https://richardsonlab.ucr.edu/real-time-frosti
The
sourcecode is at Github. It is clones at /var/www/html/real-time-frosti, and
this is the block added to nginx config file at /etc/nginx/sites-available/default : |
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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 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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Wed Nov 20 12:31:24 2024, Luis, Update, VAC, Leak test RGA Scan after vacuum repairs
|
[Luke, Luis]
After the gasket replacement performed on Monday (11/18/24) we let the vacuum pump down to UHV pressure for a couple days. Today (11/20/24) we
measured the pressure to be 5.30*e^-9 with a temperature of 22C, and we performed a leak test and RGA Scan. |
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Tue Nov 19 17:10:34 2024, Luke , Update, VAC, Leak check
|
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 Oct 23 11:48:06 2024, Luis Martin, Update, VAC, Leak Test Results
|
[Luke, Luis, Mary, Ma]
On 10/22/24 Luke, Ma, Mary and myself ran a leak test, 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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Mon Nov 20 20:45:16 2023, Aiden, Update, VAC, Leak Test
|
[Aiden, Luis]
Tested every weld and flange to find leaks. Only found that the flange on the turbo pump and reducing nipple was still at 2e-9
torr on the leak. The chamber still rose in pressure when the two gate valves were closed but no noticeable leak could be found on the lid or welds. |
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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
|
| 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
|
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
|
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
|
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
|
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
|
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
|
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
|
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
|
[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
|
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
|
| 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
|
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.)
|
[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
|
[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
|
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 May 26 23:24:33 2025, Michael, Update, Interferometer Simulations, Initial Monte Carlo Simulations for Toroidal Mirrors Project
|
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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Tue May 6 13:07:34 2025, Michael, Update, Interferometer Simulations, Initial Convergence Plots for Toroidal Mirrors Project
|
| |
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Mon Jun 3 14:14:39 2024, Tyler, Update, FLIR, Initial CIT FROSTI Analysis
|
[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
|
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 |
|
Tue Mar 19 10:55:30 2024, Tyler, Update, FLIR, In-Air Optical Test
|
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. |