ELOG ligo-ex

ADC-DAC loopback testing and IOLAN installation

UPDATE: Follow up ADC-DAC loopback testing now complete, matching all the ADC channels to a single DAC channel, and then matching all the DAC channels to a single ADC channel (see attached xlsx file or access directly here). Also note c1msc model file has been updated to include the second set of 16 ADC channels. The newly added channels also have their own filter modules, but those are not needed for anything other than the loop-back testing and can now be deleted if we don't want to keep them.

Quote:

[Shane, Jon]

Finished ADC-DAC loopback testing today (see attached xlsx file or access directly here). All looks well with the first 8 channels, with the gain hovering just under 2. Also edited c1msc model in simulink to add channels 7-15 (the last 8 channels), and changed the rate back to 64K. See image 1 for the updated c1msc model. The last 8 channels are also looking good and show no problems, with slightly more scattering for the gain, but all values very close to 2.

We also installed the new eight-channel Perle IOLAN SDS8 terminal server today. Image attached.

NOTE: When we were installing it, we noticed an energized wire dangling from the 24V power supply. Has since been fixed and put back into place.

Attachment 1: Follow-up_ADC-DAC_Loopback_Testing.xlsx

419

Fri Aug 2 13:50:22 2024

Serial Comm. Test (Agilent Turbo Pump)

Did a brief communication test with the agilent turbo pump today, to see if we could get serial communications up and running for it. Used a simplified python script with sockets package to establish a connection and send a simple command to query the pump's operational status. The connection was successful, and had no issues establishing. The command also sent successfully, and received a response. The response didn't make sense, though, as all the possible statuses correspond to integers 0-7, and this test returned the integer 15. Need to troubleshoot some more to figure out why it's returning nonsense values. Possible match-up issue with the way the information is being encoded on each end? At the very least, connection and command sending are both working fine, and this showed that the pin-out connections we were assuming (image attached) are correct for basic connection to work.

Attachment 1: pinouts.jpeg

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Tue Sep 3 18:24:17 2024

Tyler

Cymac Timing Chassis Issue

[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.

Draft

Tue Oct 1 19:41:23 2024

CyMAC Timing Chassis Issue

[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 is drawing just enough power to survive on its own, but when the current gets split to go to the 3010 as well, the 5015 takes more than it needs and becomes overpowered, and thus no longer outputs anything. We want to test further by powering them with two separate power supplies, but we need another one of the power connectors for the 3010 (the only one we have branches out from the connector to the 5015 and we don't want to cut any of the wires). Images of the inside of the chassis, along with two roughly sketched circuit diagrams (one showing the current setup, in which they're powered by the same source, and one showing a possible test set up, in which they're powered separately.

Attachment 1: IMG_5917.jpeg

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Attachment 3: IMG_5804.jpeg

461

Thu Oct 17 13:24:23 2024

Timing Chassis issue identified

[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. Square wave outputted by the 3010 was exactly as desired (image attached) at the correct frequency, and this confirms the issue was the breaker, not the valon 5015. Ready to go ahead with ordering a new replacement breaker.

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Fri Oct 25 10:56:30 2024

Timing Chassis fixed and reinstalled

[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.

Attachment 1: successful_timing.jpeg

473

Thu Nov 14 11:58:05 2024

Turbo pump connection troubleshooting

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 RS232) all match what the Iolan was expecting with the previous connection test. Also notable: the code used for the previous (failed) connection test is written using 'Letter protocol', which is the older of the two communications protocols supported by these kinds of pumps. This rules out the pump being too old to accept the newer communication format as the issue, since it's the older format being used anyway. Will continue trouble shooting to determine why previous connection test failed.

Fri Jul 22 13:20:28 2022

Phoebe

Comsol

I will be using comsol until 1:30 pm today. I will be updating the model for the heater mount to be thicker in certain areas, so that it can feasibly be 3D printed. Specifically, the radius of the center cartridge mount has been increased to add thickness to the pipe and the arms of the bridge. This will allow us to print with a much smaller chance for error, as the printer can print objects with a minimum length of 1 mm.

Tue Feb 28 19:33:51 2023

Peter

532 M2 Measurements

Y axis of plot in units of micrometers. X axis in units of millimeters.

Wed Mar 8 18:35:52 2023

Pamella

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 outside the cleanroom. We wiped the main tabletop as well as the legs and all parts for the table. We wiped the computer desk, the boxes, the cabinets and every part outside the cleanroom. For now we finished the lab cleaning.

371

Fri May 31 19:37:47 2024

Luke

Vacuum chamber Disassembly

[Luke, Aiden, Jon, Michel, Tyler] Work done: On Tuesday (5/28) we removed the RGA line with minimal difficulty. On Wednesday (5/29) we removed the turbo pump, which had a few bolts that we needed to cut. We borrowed a dremel with ceramic blades from the machine shop to help remove some of the bolts. On Thursday we moved the vacuum chamber onto the floor to check and resecure the heating band on the bottom of the vacuum chamber. We then relocated the posts the vacuum chamber rests on closer to the end of the table and reinstalled the chamber. The post’s height was also reduced from 2in to 1in. Current state of vacuum chamber: The vacuum chamber is currently reinstalled in its new position. Some of the parts on the table will be used in the assembly of the turbo pump and RGA lines with the others being able to be moved to storage.

Attachment 1: IMG_1681.jpg

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Wed Jun 19 18:45:14 2024

Luke