ID |
Date |
Author |
Type |
Category |
Subject |
314
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Fri Feb 2 19:08:20 2024 |
Aiden | Update | VAC | 1st Hot Element RGA Scan |
Here are the measurements for the RGA scan of the elements while on at around 160C. The pressure of the chamber during the test was 4.12 e-8 torr. |
Attachment 1: bake10_240202_Elements_ArC.png
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Attachment 2: bake10_240202_Elements_ArO.png
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274
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Tue Nov 21 14:47:24 2023 |
Tyler | Update | Lore | 1129 Workbench Assembly Update 1 |
[Tyler, Shane, Mohak, Cynthia, Luke, Michael, Luis]
Started assembly of the workbench equipment today. We completed the stools, and have constructed the frames of each workbench. All that needs to be added are the tabletops and the top shelves, which will be done on Monday. |
Attachment 1: IMG_7569.jpg
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Attachment 2: IMG_7568.jpg
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278
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Mon Nov 27 14:22:30 2023 |
Tyler | Update | Lore | 1129 Assembly Update |
[Tyler, Michael, Luke, Cynthia]
The tabletops have been attached to the workbench frames. Unfortunately, one of the tabletops came out of the box with a large scratch and small dent in the middle. One of the electric top shelves is ready to be attached to the undamaged table, but the other is yet to be opened. Assembly will be completed Wednesday morning.
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Attachment 1: IMG_7669.jpg
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Attachment 2: IMG_7668.jpg
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75
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Fri Apr 21 15:21:18 2023 |
Pamella | Update | FLIR | |
FLIR project updates
- 01:50 pm: Starting test position 34 mm distance to black wall.
- Parameters : 0.100 A, 1.5 V and the temperature inside the mirrors 40°C.
- 2:09 pm : Finished the test and figured out this position it is too far the black wall so now we change for more close position.
- 2:17 pm: Starting test in another position: 10 mm distance to the black wall( this measurement is between the black wall and the aluminum lid)
- 2:26 pm : Finished this second tried and take a snap. The image is attached below.
- The name for the picture for this tried is “AcquisitionImage(Apr-21-2023_14 26)”.
Note: The second tried the temperature didn't up more than 40°C for 8 minutes so I change the current for a few seconds.
I started with 0.98 A with 1.7 V and up until 0.350 A with 2.5 V, just for a few seconds and in this way the temperature up to 72°C and I get the snap.
The next step should be understand the problem with the shape and work in changes for get the triangle in the FLIR image. |
Attachment 1: AcquisitionImage(Apr-21-2023_14_26).jpg
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249
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Mon Oct 30 11:03:56 2023 |
Tyler | Update | Scripts/Programs | |
FLIR: After some adjustments, the plot generated from the FLIR measurements look much more symmetric (see attachment). There are more included grid points, which smooths out the curve as compared to last week.
Red Pitaya: It looks like a new OS update was released for the RP, which includes a new Python API (was previously only available in C). I'm going to try and update the one we have currently running in lab.
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Attachment 1: Screenshot_2023-10-23_at_12.39.05_PM.png
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299
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Mon Jan 8 20:24:53 2024 |
Aiden | Update | General | |
[Jon, Aiden]
Installed the heater elements into their fixture and prepped the cables by twisting the wires into pairs. We also installed the pins onto the wires and placed them into the peek DB 25 connector. The installation tool we had did not fit the pin size we had so the pins needed to be installed by hand by opening the connector and holding them in place. In the future we will need to make sure we twist the wires together, group them, and then splice them all to the same size for easier installation. We then grouped all the twisted pairs into a bundle and zipped them together. On the left with two peek zip ties is the power and on the right is the RTD with one peek zip tie. This orientation remains true when looking at the feed through flange from the outside with the power port on closest to the wall.
We also installed the heater elements numbered 1-8 starting from the left in image 3. These elements have numbers as resistance data was taken before as to identify the heaters after they are in the chamber. After installing the DB 25 connectors we tested that the pins were in the right orientation by using a volt meter and testing the resistance where the cable runs into the the actual power supply. It seems that all the pins were properly installed and the resistance values all match with each one gaining about 2 Ohms from the cable itself.
Then the pump down was started. The pump was very slow and we suspected a leak but after changing the o-ring pump down was not any faster and we decided to leave it over break as it seemed to just be water outgassing from the aluminum. The chamber is now able to be RGA scanned and leak tested before the next bake as it is low enough pressure. |
Attachment 1: IMG_4888.jpg
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Attachment 2: IMG_4886.jpg
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Attachment 3: IMG_4887.jpg
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306
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Tue Jan 16 16:11:41 2024 |
Aiden | Update | VAC | |
[Aiden,Luis]
Below is the data for the most recent bake. I believe the chamber is cleaner than it is actually showing as the RGA data was still getting lower while the data was being taken. I will take the data again tomorrow just in case. Still, the data shows that the chamber is basically as clean as it was before bake 10 and this means further power testing can proceed.
Helium leak tested the chamber again today to check if the sealant changed anything. The two primary target flanges from last time have improved significantly with the flange from the RGA on the cross now being below 2e-14. While the turbo pump flange was leaking at a rate of 4e-13. Much better than what it has been before. |
Attachment 1: bake10_240116_Elements_ArO.png
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Attachment 2: bake10_240116_Elements_ArC.png
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391
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Mon Jul 1 11:45:45 2024 |
Sid | Update | Interferometer Simulations | |
Progress update: Most of last week was spent getting set up with SIS, and learning how to do basic simulations. The goal for this week is to begin reproducing the methodology from T2000338. I have begun with studying perturbations to mirror curvature and position in a simple FP cavity, but thus far have been unable to get the same results. |
421
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Tue Aug 6 13:07:07 2024 |
Xuejun | Update | Interferometer Simulations | |
[Xuejun]
The width and location of the measured in-air change in temperature profile has been determined to be 0.045m and 0.137m respectively. Subsequently, a fake irradiance profile was able to be generated that best resembled what the actual irradiance profile could be using this information for testing in COMSOL. The generated irradiance profile that output the most similar change in temperature profile as the measured in-air profile has been included as well as the change in temperature profile it produced on the blackbody screen "test mass" model in COMSOL. |
Attachment 1: Thermal_model_image.png
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Attachment 2: generated_irradiance_profile.png
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471
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Wed Nov 13 14:06:00 2024 |
Luke | Update | General | |
slides |
504
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Mon Jan 27 23:35:28 2025 |
Xuesi Ma | Update | | |
[Ma]
Installed all the pins to the peek DB 25 connectors |
Attachment 1: 20250127_142647.jpg
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Attachment 2: 20250127_153454.jpg
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Attachment 3: 20250127_154516.jpg
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508
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Mon Feb 3 13:17:21 2025 |
Xuesi Ma | Update | | |
[Ma]
changed all zip ties to peek zip ties, and grouped wires together. The setup is ready to go into the chamber. |
Attachment 1: 20250203_123153.jpg
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Attachment 2: 20250203_123213.jpg
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514
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Tue Feb 18 10:01:07 2025 |
Xuesi Ma | Update | | |
[Ma, Pooyan, Tyler]
On Friday, we connected the vacuum chamber with the Cymac. |
Attachment 1: IMG_7916.jpeg
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Attachment 2: IMG_7915.jpeg
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Attachment 3: IMG_7917.jpeg
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525
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Tue Feb 25 10:02:32 2025 |
Xuesi Ma | Update | | |
1424039912.625576 2025/02/19 22:38:14 UTC Time start
24V 2.8A right after start all 8 elements
1424044804.902443 2025/02/19 23:59:46 UTC Time stop
24V 1.8A right before stop all 8 elements
0.1A right before start and right after stop
note: turned on briefly to check current right before stop
2/20 RGA Scan
spikes??
1424129207.857777 2025/02/20 23:26:29 UTC Time start
24V 2.9A right after start all 8 elements
1424140789.856096 2025/02/21 02:39:31 UTC Time stop
24V 1.7A right before stop all 8 elements
0.1A right before start and right after stop
2025/02/21 02:43:19 UTC
Main chamber pressure: 1.54e-8
RGA chamber pressure:5.06e-9
spikes are due to loose connection between connectors.
1424210410.173863 2025/02/21 21:59:52 UTC Time start
24V 2.9A right after start all 8 elements
1424218357.96404 2025/02/22 00:12:19 UTC Time stop
24V 1.7A right before stop all 8 elements
each elements: 0.3A (0.2A increment)(all)
0.1A right before start and right before stop
2/24 RGA Scan
1424467918.129082 2025/02/24 21:31:40 UTC Time start
12V 2A right after start all 8 elements
1424478936.635821 2025/02/25 00:35:18 UTC Time stop
12V 1.6A right before stop all 8 elements
each elements: 0.4A (0.2A increment)(all)
0.2A right before start
rise time: A(1-exp(-t/tau))+B
fall time: Aexp(-t/tau) +B |
Attachment 1: resistance_vs_time_all_channels_all_time.pdf
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Attachment 2: temperature_vs_time_all_channels_all_time.pdf
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Attachment 3: resistance_vs_time_rise_time.pdf
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Attachment 4: resistance_vs_time_fall_time.pdf
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539
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Tue Mar 11 10:43:57 2025 |
Xuesi Ma | Update | | |
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)
Next step is to bypass the AI Chassis to find the source of the spikes |
Attachment 1: 20250310_171936.jpg
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544
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Mon Mar 31 15:41:56 2025 |
Xuesi Ma | Update | | |
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
Refer to:
https://dcc.ligo.org/LIGO-E2300117
https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?.submit=Identifier&docid=D2300124&version= |
545
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Tue Apr 1 11:47:08 2025 |
Liu | Update | | |
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Attachment 1: Thermal_state_decoder_update.pdf
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547
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Mon Apr 7 13:28:49 2025 |
Xuesi Ma | Update | | |
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: AI Chassis remains powered on. Signal is again measured directly from the adapter board. This time, the remaining ports on the adapter board are not connected to the filter board.
- Observation: Multiple spikes observed, distributed evenly across the entire measurement.
Test 3: Isolation Test with Spare Adapter Board (ongoing)
- Setup: Suspecting the original adapter board may be faulty, a spare adapter board is used for comparison. Signal is measured directly from this spare board.
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Update, 04/08/25, Tue 17:30
Took the old adapter board out of the AI chassis and and used it to connect DAC to AA chassis. If no spikes are seen, it means that the glitches are not originating from this board.
Also checked al the previous spikes using the raw data (65536 Hz sample rate). The duration of the glitches are ~1 second, despite the previous guess that they are happening in the Milli-second scale.
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Attachment 1: 20250403_151946.jpg
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Attachment 2: ELOG_Spike_adapter_filter_on.png
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Attachment 3: 20250404_143624.jpg
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Attachment 4: ELOG_Spike_adapter_isolate.png
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Attachment 5: 20250407_105846.jpg
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553
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Tue Apr 15 11:13:43 2025 |
Xuesi Ma | Update | | |
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 spike observed.
Test 6: Single ground connection check
- Setup: AI chassis powered on but remains isolated from the frame. The signal is measured from the output of the AI Chassis. (Attachment 1 ,2)
-
- Observation: No spike observed.
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Attachment 1: 20250414_120428.jpg
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Attachment 2: 20250414_120423.jpg
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Attachment 3: 20250411_163105.jpg
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559
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Tue Apr 22 12:08:46 2025 |
Xuesi Ma | Update | | |
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.
- Setup: CLose up the AI Chassis, and put it back to its original location.
-
- Observation: No spike observed.
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Attachment 1: 20250415_161755.jpg
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Attachment 2: 20250416_174640.jpg
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Attachment 3: 20250422_105614.jpg
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572
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Tue May 6 13:19:31 2025 |
Xuesi Ma | Update | | |
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Attachment 1: resistance_vs_time_RV_rise_time_24.pdf
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Attachment 2: resistance_vs_time_all_channels_all_time_RV.pdf
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576
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Tue May 13 12:35:01 2025 |
Xuesi Ma | Update | | |
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Attachment 1: resistance_vs_voltage_all.pdf
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Attachment 2: resistance_vs_voltage_overlay.pdf
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Attachment 3: resistance_vs_time_all_channels_all_time_RV.pdf
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579
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Mon May 19 10:59:14 2025 |
Xuesi Ma | Infrastructure | | |
Status Update
Previous Status:
All Sorensen power supplies were turned off. The Cymac system was down (all chassis were offline).
If you need more information or assistance in turning them back on, please contact Xuesi Ma.
Update: The systems are now back online.
Note: The Sorensen power supplies’ voltage can now be controlled via channel VEXC8 of the DAC.
If scripting is required, the ezca Python package is highly recommended for interfacing and control.
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583
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Tue May 27 12:52:22 2025 |
Xuesi Ma | Update | | |
Using the configuration in section 2.11.1 in the Sorensen installation and operation manual (attached below), I'm able to remote control the Sorensen power supply.
I use DAC VEXC8 as the external voltage source and a breakout board to match the configuration of connector J3.
I have recorded 7 cycles (attached below), and am now working on analyzing the data. |
Attachment 1: operating-manual-Sorensen-DCS-programmable-switching-dc-power-supplies-1kw-dcs-e.pdf
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Attachment 2: 20250515_171905.jpg
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Attachment 3: 20250515_164637.jpg
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Attachment 4: 20250515_164634.jpg
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Attachment 5: 20250515_164842.jpg
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Attachment 6: resistance_vs_time_all_channels_all_time_RV_ladder.pdf
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588
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Tue Jun 3 13:08:47 2025 |
Xuesi Ma | Update | | |
We currently have the parts for a DB9 connector but need parts for a DB25 connector, where did we get the parts for the DB9 connector? We may be able to use the same company for the DB25 connector.
Also need a cable for the connectors. Find a DB9 to DB9 cable in 1129, not sure if I can disassemble it and use just the cable.
The pressure in the vacuum chamber rises to 2.12e-8 torr, which needs baking. |
Attachment 1: 934.jpg
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Attachment 2: 933.jpg
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589
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Tue Jun 3 13:16:53 2025 |
Xuesi Ma | Infrastructure | | |
Date and Time: Around 3:50 PM on June 2, 2025
Location and Temperature:
- Back of the room 1119, around the working station: 86 °F
- Front of the room 1119, around the doorway: 84.1 °F
- Back of the room 1129, around the working station: 78.6 °F
- Front of the room 1129, around the doorway: 78.3 °F
- In the hallway in front of room 1119: 75.2 °F
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