 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 20 12:31:24 2024, Luis, Update, VAC, Leak test RGA Scan after vacuum repairs
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[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
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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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Thu Nov 14 11:58:05 2024, Shane, Update, CDS, Turbo pump connection troubleshooting
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Attempted connection to the TV551 turbo pump through Varian/Agilent's software on spica. Successful connection established, and we are able to read out
al the readings associated with the pump (status, temperature, etc) through the software, which is actually pretty extensive and well organized. Was able
to stop and restart the pump with no issues. Serial communications seem to be working fine, and the current serial settings (baud rate 9600, serial type |
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Thu Nov 14 10:46:20 2024, Luke , Summary, Cleanroom, Cleanroom cleaning
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[Luke, Luis, Michael]
cleaning cleanroom and particle count |
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Wed Nov 13 14:06:00 2024, Luke , Update, General,
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| slides |
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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 6 13:48:55 2024, Liu, Update, Interferometer Simulations, QN modeling update
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| Slides |
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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 Nov 5 09:56:04 2024, Luis Martin, Update, Clean & Bake, MR Bake
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[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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Tue Oct 29 16:37:35 2024, Tyler, Update, Electronics, Red Pitaya OS Update
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The Red Pitaya ecosystem has been upgraded to OS 2.00-35, with a key feature being greater freedom in adjusting the sampling frequency for signal
analysis. Before, decimation factors could only be applied if they were a power of 2 (i.e 2,4,8,16,...) up to 65536. Now, the factors can be any power
of two up to 16, and any whole number greater than 16 up to 65536. Further information can be found here. |
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Fri Oct 25 10:56:30 2024, Shane, Update, CDS, Timing Chassis fixed and reinstalled
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[Ma, Shane]
We replaced the 1A breaker in the timing chassis today with a 4A one, and tested that all is working
well. The chassis successfully outputted the correct signal (image attached). The real time models have also been restarted and the CyMAC diagnostics screen
is showing all green flags. Timing chassis has been closed up and reinstalled in the server rack. |
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Wed Oct 23 12:33:54 2024, Luke , Update, , Zernike calculation update
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PowerPoint slides new
PowerPoint slides older |
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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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Wed Oct 23 11:48:06 2024, Luis Martin, Update, VAC, Leak Test Results
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[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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Thu Oct 17 13:24:23 2024, Shane, Update, CDS, Timing Chassis issue identified
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[Ma, Luis, Shane]
Working theory for the timing chassis issues had been that the 1A breaker was tripping and
causing the failure of the Valon 5015 and 3010 to output the timing signal correctly. We just tried bypassing the breaker, running 6 V on the benchtop
power supply (set the current limit to 1.5A), with the 5010 generating the sine wave to pass to the 3010. All worked correctly, and there were no issues. |
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Wed Oct 16 14:13:31 2024, Liu, Update, , FROSTI with non uniform absorption scattering sources
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| Slides |
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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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Tue Oct 15 15:27:38 2024, Xuesi Ma, Update, ELOG, Timing Chassis Update 12x
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I conducted separate tests on the '5015' and '3010a'. When powered individually, the '5015' outputs a signal at 33.55 MHz with an amplitude of 608
mV. It draws 1 A of current from the power source. The input signal for the '3010a' is 33.54 MHz with an amplitude of 670 mV (peak-to-peak) and a 15 mV
DC offset. The output signal from channel 1 is a 65.5 kHz square wave with an amplitude of 3.28 V. The '3010a' draws 0.1 A of current.
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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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Thu Oct 3 19:35:04 2024, Shane, Update, Cleanroom, Cleanroom cleaning and particle count
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[Luke, Michael, Cynthia, Mary]
cleaning cleanroom and particle count
12:25 pm: started particle count
zone 3: 0.3 u: 46140.5 u: 8721.0 u:83
zone
4: 0.3 u: 24110.5 u: 4151.0 u: 83
12:48 pm: began surface check and wipedown, including |
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Wed Oct 2 14:49:59 2024, Liu, Update, , FROSTI ETM actuation
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Proposed FROSTI ETM actuation on the HOM7 resonance.
Animation |
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Wed Oct 2 13:38:00 2024, Cynthia, Update, Interferometer Simulations, cavity scan with averaged O4 ETM coating as plume
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| |
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Wed Oct 2 12:20:43 2024, Tyler, Update, TCS, Updated FROSTI Analysis 10/02/2024
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| Attached below are updates on current FROSTI prototype analysis. |
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Wed Oct 2 12:05:42 2024, Luke , Update, , Ringheater modeling Update
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| Power point slides |
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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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Tue Oct 1 19:41:23 2024, Shane, Update, CDS, CyMAC Timing Chassis Issue
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[Shane, Luis]
Summary of the issue we've been having with the timing chassis: when we connect only the Valon 5015 to power, the timing signal comes
out of it sinusoidal as expected and the status lights are steady and all looks good. As soon as we connect the 3010 to power, the signal (both coming
out of the 5015 and coming out of the 3010) go flat and the status lights of the 5015 start to flicker.
We think what may be going on is that the 5015 |
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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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Mon Sep 23 15:11:21 2024, Tyler, Update, Scripts/Programs, Effective Emissivity Analysis and RIN Update
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A quick update on the effective emissivity analysis for the CIT FROSTI testing:
I was able to (roughly) match the OPD data to a referenced COMSOL model, with an applied power of 12.6 W (as seen below). However, when changing
the emissivity of the ETM in COMSOL, the dT profiles do not seem to change much. I am not sure as to why this is the case at the moment, and will continue |
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Mon Sep 23 15:00:41 2024, Cynthia , Update, Interferometer Simulations, corrections on assumption for O5 coating
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The document recording ETM07 and ETM08 coating (T2300093) was discussed:
the current plume files are not necessarily correct in a way that LIGO lab
have tried to add it on uncoated ETM such as ETM07 and it does not match what the coated ETM07 would look like.
the plume should be added on top of
the uncoated ETM instead of assuming an ideal ETM. According to Garilynn, the imperfection on uncoated ETM matters.
So far the possible ETM data used |
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Mon Sep 23 08:29:49 2024, Luke, Update, Interferometer Simulations, Ringheater update
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Ringheater Update
If the link does not work here is the file. |
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Mon Sep 16 15:18:59 2024, Cynthia , Update, Interferometer Simulations, a breakdown of FROSTI and thermal effects and the resulting cavity scan
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| |
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Mon Sep 16 14:59:51 2024, Tyler, Update, TCS, FLIR RIN Update 09/16
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Below is the dark noise spectrum of the Red Pitaya, which was measured over the course of a weekend. Additionally, I have successfully measured a signal
from the photodetectors with the FROSTI as the IR source, so it seems there shouldn't be any worry of these particular detectors not being feasible for
the RIN measurement. |
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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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Mon Sep 16 07:28:16 2024, Luke, Update, Interferometer Simulations, Ring heater update
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| |
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Mon Sep 9 21:02:37 2024, Luke, Update, VAC, Steadystate temperature of flanges
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I measured the temperature of the flanges and reconnected the RGA turning on its filament. I then turned off the PID controllers.
Here is a table that has the temperature of the different parts of the vacuum chamber.
Electronics
Temperature (C)
Pressure gauge (Main volume)
81
Main |
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Mon Sep 9 14:27:36 2024, Pooyan, Infrastructure, Computers, Chimay backup attempt
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One ongoing work is to make all lab machines automatically backed-up on Scribe on a daily basis. The updates should be boatable and stored for some time
(potentially a few weeks) on Scribe. Making whole disk images has already been tried for some of the machines with no problems. (e.g., Cymac and WorkStations)
The same thing can not be done with Chimay though, as it currently has one huge RAID-controlled volume that stores all the information (OS, home |
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Mon Sep 9 12:36:45 2024, Michael, Update, Interferometer Simulations, Update on Analysis of Mode Mismatch Minimization in A#
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I have taken a closer look at the solution curve in the mirror parameter space which I have searched, focusing on the "resilience" of specific points, with
the plan to analyze how certain conditions of the interferometer change as we move along this solution curve. |
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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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Tue Sep 3 18:24:17 2024, Tyler, Update, CDS, Cymac Timing Chassis Issue
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[Tyler, Jon]
The timing chassis used for the cymac has been shut off due to an unknown issue causing its supplied current to fluctuate. All real-time
models will be suspended until a solution is found.
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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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Sun Sep 1 16:17:40 2024, Luke, Update, VAC, Vacuum chamber leak checking and re-applying heating tape
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[Luke, Luis, Cinthia, Michal, Tyler]
On the 26th Cinthia, Michal, and I took off the insolation on the vacuum chamber and re-routed it to include the new RGA volume.
The next day Luis and I finished up the last of the flanges to be attached. We attached the Pirani gauge with a conical reducing nipple to the |
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Thu Aug 29 16:39:34 2024, Luke, Update, VAC, Photos of heater tape 6x
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| |
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Tue Aug 27 18:37:40 2024, Luke, Update, Interferometer Simulations, Ringheater model update
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Updated the model to produce a more circular deformation in the HR surface. The first three attachments are from irradiance patterns gotten from ray tracing.
The last is from a pre-defined irradiance pattern. |
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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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Mon Aug 26 14:42:04 2024, Cynthia , Update, Interferometer Simulations, current status on cavity scan with effects of FROSTI
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I used the code and arm cavity model used for previous O5 study on mirrors and HOM (the pdf of the study and the result can be found at https://dcc.ligo.org/LIGO-G2100878),
but it seems like the result I obtained is different from the study result. Since my cavity scans codes have a large portion of it relying on this code,
I will have to go over the study result and the code to make sure there is no issue with that code itself first. There are also some other updates or issued |
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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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Mon Aug 19 07:11:55 2024, Cynthia, Update, Interferometer Simulations, cavity scans with FROSTI effects
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Fri Aug 16 12:51:46 2024, Luis Martin, Update, VAC, Update on vacuum chamber status
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[Luis, Luke, Tyler]
Vacuum chamber parts were finally received and assembled. After whipping down the parts, the blank was removed from the reducing cross. Then,
the zero-length reducer was attached. Lastly, we installed the T that had the argon leak and RGA. The final pump down showed signs of an improved seal |
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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 |