 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 May 13 12:41:06 2025, Tyler, Update, TCS, A# Profiles Update
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| Slides on the A# ITM FROSTI profile modeling efforts can be found here. |
Tue May 13 12:35:01 2025, Xuesi Ma, Update, , 
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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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Fri May 9 20:06:27 2025, Luke , Summary, Cleanroom, Cleanroom cleaning
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[Luke, Mohak, Luis]
We were also able to remove the residue that has built up on the soft walls by donning a skinny bunny suit and with two wipes rubbing both sides
of the soft walls at the same time. The wipes would get gummy very quickly and need to be replaced frequently. |
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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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Tue May 6 13:19:31 2025, Xuesi Ma, Update, ,
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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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Tue May 6 12:25:03 2025, Tyler, Configuration, CDS, Cymac ADC CSD measurement
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An initial measurement of the cymbal ADC CSD is attached below. As of now, it seems that the sensitivity limit is roughly the same as that of the Red Pitaya.
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Sun May 4 18:17:45 2025, Luke , Update, Scripts/Programs, Ringheater modeling Update
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Slides
I have changed some properties of the thermal model and am re-running the thermal sweeping
I have also been messing around with making
a logo |
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Fri May 2 12:34:02 2025, Xuesi Ma, Update, VAC, Stopped bake
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The vacuum chamber has stopped baking.
Current state as of 12:30, 5/2/2025:
The gate valve is open, and the filament of the RGA is on. |
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Wed Apr 30 17:33:14 2025, Xuesi Ma, Update, VAC, Started bake
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[Luke, Ma, Tyler]
The vacuum chamber is currently baking.
Current state as of 5:00 |
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Wed Apr 30 15:43:56 2025, Luis, Update, VAC, Vacuum Update
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[Ma, Luke, Luis]
April 29, 2025
3:30 PM |
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Wed Apr 30 13:42:45 2025, Shane, Update, CDS, UPS comms successful
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Update on UPS1 serial interfacing: communication is now successful. On 4/15/25 we connected to UPS1 via ethernet rather than USB, and manually added its
static ip address (noted in lab network wiki) to the router. Able to connect and unpack all desired data nicely using telnet server connection via telnetlib.
In process of finalizing code and will work next on interfacing UPS2. |
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Tue Apr 29 10:59:25 2025, Liu, Update, Interferometer Simulations, Test Mass Thermal State Decoder with Updated Comparison Cases
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Mon Apr 28 22:08:28 2025, Luis, Update, VAC, Vacuum Leak Test result
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[Ma, Luke, Luis]
April 24, 2025
3:00 PM |
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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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Fri Apr 25 09:09:03 2025, Luke , Update, Scripts/Programs, Update to optimization plots
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I have calculated the curvature of the surface plots and created a heat map out of the data. I have also created a contour plot of them together. It is
very rough and the artifacts at small w make it hard to read. I am planning on excluding that data and replot them. In the meantime I have created a temporary
function that balance the two values. (log_10(curvature/HOMscattering))
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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 Apr 22 12:08:46 2025, Xuesi Ma, Update, ,
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Test 7: Reconnect ribbon cables
Setup: Reconnect all the ribbon cables, and turned on the AI Chassis while isolated
rack
Observation: No spike observed.
Test 8: Reconnect to rack
Setup:
Reconnect the AI Chassis to the rack.
Observation: No spike observed.
Test 9: Restore to original position.
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Tue Apr 22 11:04:31 2025, Liu, Update, Interferometer Simulations, Test Mass Thermal State Decoder Update with Interferometer Operation
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Tue Apr 22 08:00:39 2025, Luke , Update, Scripts/Programs, Thermal optimization modeling 40kg
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I have redone the width and location optimization with a 40kg test mass. This was to see where the nominal ring heater would fall in this optimization
map see attached.
There are two concerns I have with this modeling: |
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Mon Apr 21 16:56:42 2025, Michael, Update, Interferometer Simulations, Fixed Observed Squeezing Curve for Toroidal Mirror Case
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We've resolved the issue with the observed squeezing curve for the toroidal mirror case showing worse performance at lower frequencies and better performance
at higher frequencies compared to the nominal case. This issue was caused by the beam parameter at the squeezer being fixed before changing the radii of
curvature of the mirrors. This has been changed to be fixed after changing the mirrors, and we see an improvement in the toroidal mirror case. |
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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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Tue Apr 15 11:37:17 2025, Cynthia, Update, Interferometer Simulations, Finishing up mirror coating map step
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Tue Apr 15 11:13:43 2025, Xuesi Ma, Update, ,
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Test 4: AI Chassis ground isolation
Setup: AI Chassis isolated from the ground with readout directly connected to
adapter board
Observation: No spike observed.
Test 5: Ribbon cable check
Setup:
AI Chassis remains isolated from the ground. The signal is measured after the ribbon cable. (Attachment 3)
Observation: No |
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Tue Apr 15 11:09:37 2025, Liu, Update, FLIR, Test Mass Thermal State Decoder Update with robustness study
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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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Tue Apr 8 12:15:59 2025, Luke , Update, Scripts/Programs, Updated optimization plot
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Tue Apr 8 10:47:10 2025, Liu, Update, General, Test Mass Thermal State Decoder Update
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Tue Apr 8 00:17:01 2025, Michael, Update, Interferometer Simulations, Squeezing Performance Graphs for Case With and Without Toroidal Mirrors in LIGO
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I've created some graphs for the frequency dependent observed squeezing level in LIGO for both the nominal case and the case where we include toroidal mirrors,
giving some interesting results. https://docs.google.com/presentation/d/1RBr47hNaxFTdGrwys5ZCUEUOgVOVHmZ2B_5EQwY62IY/edit?usp=sharing |
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Mon Apr 7 13:28:49 2025, Xuesi Ma, Update, ,
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Test 1: Adapter Board Connected to Filter Board
Setup: AI Chassis is powered on. Signal is measured directly from
the adapter board. All other ports on the adapter board are connected to the filter board.
Observation: Two distinct spikes
observed at the beginning of the measurement.
Test 2: Adapter Board Disconnected from Filter Board
Setup: |
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Thu Apr 3 13:23:37 2025, shane, Update, CDS, UPS interfacing
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Update on UPS serial interfacing: the driver for the UPS webcard has been installed on spica (for UPS1 in room 1119) and logrus (for UPS2 in room 1129).
Static IP addresses have been assigned for both and noted on the lab wiki. Neither is yet able to connect, as the initial ip address webpage connection
test failed for both. In the process of troubleshooting now. |
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Tue Apr 1 11:47:08 2025, Liu, Update, ,
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Mon Mar 31 15:41:56 2025, Xuesi Ma, Update, ,
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The result from AI Chassis bypass test showed that the AI Chassis may be the problem. There are no spikes from DAC's direct output.
All chassis except timing chassis are turned off. Power supplies for 24V, 18V, and -18V are turned off
The AI chassis has been taken out of the rack for further inspection |
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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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Tue Mar 25 12:56:47 2025, Tyler, Update, TCS, FROSTI Analysis Finalization
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Upon final review of the FROSTI analysis included in the (hopefully) soon-to-be submitted instrument paper, I've made some adjustments to the reflectivity
analysis that estimates the amount of power delivered to the test mass by the FROSTI. Initially, as detailed in elog
447, the delivered power was approximated to be 12.6 W (later adjusted to 12.9 W), with roughly 18% of this power being reflected by the test mass. |
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Sun Mar 23 15:39:06 2025, Luke Johnson, Update, Scripts/Programs, Ringheater Location optimization
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Attached are some plots that show a new parameter sweep with a finer mesh then before. I have also been able to get a heatmap of power of HOMs in a very
simple finesse model. |
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Tue Mar 11 11:28:52 2025, Cynthia, Update, Interferometer Simulations, flattening mirror to study power discrepency
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Tue Mar 11 10:43:57 2025, Xuesi Ma, Update, ,
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Continue investigation in the spikes
Pulsed ADC with a function generator and find no spikes. Rules out ADC for causing the spikes
Loopback test that bypasses the FROSTI Chassis shows spikes (spikes happened on all channels at the same time) |
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Mon Mar 10 21:32:29 2025, Nathan, Physics, Electronics, Beam Profiling and PBS Measurements
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Beam wasn't diverging, however maybe was about to diverge when measurements stopped? Will discuss the PBS measurements and how the voltage changed due to
the wave plate. |
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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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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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Wed Mar 5 18:13:20 2025, Shane, Update, CDS, vac system comms
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[Shane, Jon]
Update on the serial interfacing with the Inficon VGC503 pressure gauge: We began setup of the Inficon pressure gauge today. We configured the ethernet
setting via USB and assigned it a static IP address of 192.168.1.30, which is listed in the network table on the lab wiki. It is showing up on the network |
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Wed Mar 5 12:16:28 2025, Shane, Update, CDS, Vac system communications update
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[Shane, Jon]
Update on the serial interfacing with the vacuum system: both turbo pumps are now able to successfully communicate through the code. The older
pump, for unknown reasons, required a newer version of the communication syntax (despite the newer, small pump being able to communicate fine with the |
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Tue Mar 4 10:47:03 2025, Shane, Update, CDS, Vac system pinouts
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Attached here are the pinouts, as we currently know them, for the vacuum system. The three items focused on here are the Agilent TwissTorr 74 FS turbo pump
(the smaller/newer pump) and controller, the Agilent TV 551 Navigator turbo pump (the larger/older pump) and controller, and the Eight-channel Perle IOLAN
SDS8 terminal server. The 'field' pinouts in the attached tables refer to the DB9 end of the RJ45F to DB9F converter. |
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Tue Mar 4 10:28:58 2025, Tyler, Update, TCS, RIN Plot Updates
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Tue Mar 4 10:18:43 2025, Cynthia, Update, Interferometer Simulations, attempted to remove curvature and tilt for the coating
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Tue Mar 4 03:33:18 2025, Xuesi Ma, Update, , Update 6x
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Spikes Appear Again, need to address it systematically.
Power on and off before reaching steady state ✔
At 12V, the rise and fall time of heater elements are different from 24V. |
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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 |