 Thu Nov 16 19:32:31 2023, Aiden, Update, VAC, VAC HC Levels Update 
|
Took some more RGA data today and overlaid it with data taken from October 19. I added a red line that symbolizes where all amu peaks above 44 need to be
bellow as well as a black square around the 44th amu peak. The chamber is very close to being meeting LIGO's vacuum chamber standards. |
|
Thu Nov 16 17:12:42 2023, Luis, Shane, Mohak, Update, Cleanroom, Cleanroom cleaning and particle count
|
[Shane, Luis, Mohak]
cleaning cleanroom and particle count
3:37 pm: started particle count
zone 3: 0.3 u: 12050.5 u: 7481.0 u: 249
zone
4: 0.3 u: 14960.5 u: 7481.0 u: 290
3:57 pm: began surface check and wipedown, including |
|
Wed Nov 15 21:52:33 2023, Aiden, Update, VAC, Vacuum Chamber Baking Update
|
| Took RGA data before running the degas mode. Made sure to close off the main volume before running the degas. And left the filament on. |
|
Thu Nov 9 13:48:47 2023, Aiden, Update, VAC, Vacuum Chamber Baking Update
|
After bake 7 was stopped on Wednesday morning (11,8,2023), I took RGA data of the chamber to compare to a later scan that will be done on Monday to make
sure the chamber has reached its lowest pressure. Below are the graphs. |
 Fri Nov 10 08:32:34 2023, Jon, Update, VAC, RGA experiments
|
I ran a 3-minute degas cycle of the RGA filament for the first time yesterday (in this process, the filament gets very hot in
order to "boil off" settled particulate). I was surprised to see the pressure (of not just the RGA volume, but also
the main volume) rise from 2e-8 to 5e-6 torr.
This observation, |
|
Tue Nov 14 17:21:40 2023, Jon, Update, VAC, RGA best practices
|
As a follow up ELOG 261, I have received advice from one of the vacuum experts at LIGO Hanford
on best practices for our RGA:
For future RGA degassing, definitely keep the main volume isolated, since it |
|
Thu Nov 2 17:14:36 2023, Shane, Jon , Update, CDS, CyMAC set up permanentized
|
CyMAC connections have been finalized and made permanent. Also tested voltages, which are all looking good. Warning:
power is on. Do not touch power supply terminals or screws connected to grounding cables (see attached images 4 and 5; green wires on back of power supply
with black and yellow covers, and exposed positive and negative terminals on back of power supply). |
|
Mon Nov 13 11:23:54 2023, Jon , Update, CDS, CyMAC testing
|
[Jon, Shane, Luis]
My repair of the internal ribbon connecting the ADC to the adapter board resolved the timing signal problem. After this repair, we were able to
start the front-end IOP model and checked out the RTS diagnostic screens (pictured below). All indicator lights were green except for the DK flag (indicating |
|
Mon Nov 13 11:07:50 2023, Tyler, Update, VAC, RTD Analysis
|
After initial analysis from last week on a single RTD, I then extended to looking at all 8 in series with R_ref (set to 1 kOhm). Shown below are the
edge cases for the setup:
RTDs are all at ambient lab temperature. This would correspond to a minimum resistance value.
RTDs all read out 400 C. This gives the maximum resistance value.
|
|
Mon Nov 13 06:15:45 2023, Peter, Update, VLC Update, VLC Mode Matching
|
| Weekly Updates Attached in pdf |
|
Fri Nov 10 14:16:04 2023, shane, Update, Cleanroom, new cleanroom zone diagram
|
since the vac system has been moved and made permanent, here's a new diagram of the cleanroom zones. The zones themselves haven't moved, but the diagram
has been updated to reflect the new set up of the cleanroom. |
|
Thu Nov 9 19:06:46 2023, shane, Update, Cleanroom, 5 zone cleanroom measurement
|
Here's today's five zone measurement, taken ~5 hours after the cleaning. Zone 5 (closest to fire cabinet and back wall) is a bit over the limit in all size
ranges (about 1500 particles in 1.0u size range over), and zone 2 is slightly over the limit in the 1.0u range, but everything else is under the requirement.
|
|
Thu Nov 9 13:57:58 2023, Shane, Luis, Aiden, Tyler, Update, Cleanroom, cleanroom cleaning and particle count
|
[Aiden, Shane, Luis, Tyler]
cleaning cleanroom and particle count
12:30 pm: Tyler and Aiden started organizing cables in cleanroom
12:35 pm: started particle count in flow bench
0.3 u: 116810.5 u: 32841.0 u: 1039
12:50 pm: started cleanroom particle count
zone 3: 0.3 |
|
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 |
|
Mon Nov 6 11:31:25 2023, Peter, Update, VLC Update, VLC Mode Matching
|
| See Update Attached |
|
Mon Nov 6 11:29:24 2023, Tyler, Update, Electronics, Preliminary RTD Calculations, RP Software Update
|
Preliminary RTD calculations are shown below, given an input of 10 V and desiring a few mA of current. It looks like R_ref should be at least 1 kOhm
(refer to plots/circuit below), keeping in mind we need to have
RP: The Red Pitaya Software was updated to OS 2.00. All examples on the RP website should run without issue. |
|
Wed Nov 1 20:22:07 2023, Aiden, Update, VAC, VAC System Heating Update
|
Raised the PID controller temperature to 105C today as at that temperature the lid and the barrel temperature sensors were reading around 120C. I will check
again tomorrow to see if there is any room for increase after equilibrium. |
|
Wed Nov 1 18:24:01 2023, Shane, Update, CDS, CyMAC Power connections made
|
Finished power connections today for the CyMAC chassis. Images attached. Had to switch the shrink fork terminals on the
power supply cables to shrink ring terminals, but was able to get everything connected and secured. Upcoming work: turning on power supply and testing
voltages/checking everything is turning on and lighting up correctly.
Configuration is as follows:
Topmost Sorensen: +24V (reserved |
|
Tue Oct 31 19:46:35 2023, Aiden, Update, VAC, VAC System Heating Update
|
Started bake 7 on Monday but found issues with the heating as the cross in front of the RGA got way too hot too quickly. This resulted in shutdowns of the
heater tape while I could still only set the main PID controller for the lid to 75C. Tuesday I moved the PID controller sensors to be on the cross in front
of the RGA and on the Reducing nipple. I then placed the alarm sensors onto the lid of the chamber and the barrel. This should hopefully prevent excessive |
|
Mon Oct 30 18:15:13 2023, Shane, Update, CDS, CyMAC chassis mounted and progress on power connections
|
All CyMAC chassis mounted in electronics rack today, and shelf for monitor also mounted. Images attached. Assembled grounding cables for power connections,
and attached the timing chassis to power & gnd. Powered on successfully with correct voltages in expected places. After power test, everything was turned
off and unplugged. Next steps: attach grounding cables to other four power supply chassis. Also attach anti-aliasing, anti-imaging, binary input and binary |
|
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.
|
|
Fri Oct 27 15:16:31 2023, Aiden, Update, VAC, Vacuum Leak Test
|
Leak tested the worst flanges on the chamber after moving it and after bake 6. The 6 inch flange connected to the 8 inch reducing nipple is now leaking
at 1.5 e-9, previously at 4 e-9. The 8 inch flange connected to the turbo pump is now leaking at 1.9 e-9, previously at 3 e-9. This means that the baking
most likely improved the seals on these flanges and a hotter bake might fix the leaks for good. |
|
Mon Oct 30 08:42:22 2023, Jon, Update, VAC, Vacuum Leak Test
|
By 5:30 pm Friday, the pressure had reached 8.6e-8 torr and was continuing to fall. So it seems we are OK to proceed with permanentizing this configuration
(cable routing, heater tape reinstallation).
|
|
Fri Oct 27 15:28:30 2023, Shane, Update, CDS, AA and AI chassis for CyMAC powered on and functional
|
CyMAC updates: Switched out the faulty power regulator boards in the Anti-Aliasing and Anti-Imaging chassis. Both chassis are now powering up correctly
with lights on and the correct voltages in/out of the power regulator board. Images attached. All chassis for the CyMAC now functional, so next step is
mounting everything in the rack. |
|
Thu Oct 26 13:00:45 2023, Aiden, Update, VAC, Vacuum Chamber Baking Update
|
Bake 6 was turned off on Monday. Tooke RGA data today and have posted the data below. The pressure of the chamber after taking data was 3.22 e-8 Torr. The
chamber HC levels are still not low enough but I feel with more pumping it will go down as the RGA scan was still slowly going down during the data taking. |
|
Mon Oct 23 18:02:23 2023, Shane, Jon, Update, CDS, Timing chassis assembly complete
|
Concluded assembly of timing chassis for CyMAC today; see attachment 1 for interior set up of chassis. Installed front and rear panels, wired on/off switch
and LED assembly, and tested to confirm everything is powering on correctly. Also tested the outputted timing reference that will go to DAC and ADC adapter
boards (see attachment 2 for output 1 and attachment 3 for output 2). |
|
Mon Oct 23 11:28:05 2023, Tyler, Update, Cameras, FLIR Camera Code Updates
|
The past week I've been spending time going through the FLIR code on gitlab. Initially, it had appeared that our measurements with the camera had differed
about 2 degrees C from what the thermocouple was giving (Ref ELOG 181). Upon inspection of the FLIR streaming code, I noticed a few issues:
1. The emissivity
value wasn't set correctly (was 0.999 originally, should be about 0.95).
2. The ambient temperature was set to about 21.6 C (71 F).
3. The distance given |
|
Mon Oct 23 07:28:57 2023, Peter, Update, VLC Update, VLC Mode Matching
|
| I have attached a pdf with slides of my latest updates. |
|
Fri Oct 20 16:38:02 2023, Shane, Aiden, Update, Cleanroom, Cleanrooom cleaning and particle count
|
[Aiden, Shane]
cleaning cleanroom and particle count
3:16 pm: started particle count. NOTE: we are not within the ISO class 5 standard for any size ranges in zone
3. ~6000 above limit in 0.3 u, ~2000 above in 0.5, ~200 above in 1.0 |
|
Thu Oct 19 11:41:04 2023, Aiden, Update, VAC, Vacuum Chamber Baking Update 6x
|
[Aiden, Tyler, Mohak]
Took some RGA data when we came into the room. The pressure of the chamber was 8.63e-8 Torr before turning on the RGA filament.
We saw the usual spike in pressure when the filament was initially turned on. Took some data and saw that the chamber was definitely dirtier since the
vacuum upgrade. See figures below.
Put the heater tape back onto the section that was removed. We may need to rearrange the heater tape again |
|
Thu Oct 12 12:11:10 2023, Aiden, Update, VAC, Vacuum chamber Helium leak test
|
[Aiden, Tyler, Peter, Jon]
Continued tightening bolts on the turbo pump and 6"-8" reducer to reduce the leak. The final leak test values for the
turbo pump flange was 3.0 e-9 and the other 6"-8" reducer flange was 4.0 e-9.
We will continue to let it pump down as the screws could not
be tightened anymore. Looks like new gaskets will be needed to reduce the leaking on these flanges.
|
|
Wed Oct 11 20:47:11 2023, Jon, Update, VAC, Vacuum upgrade begins
|
[Jon, Tyler, Aiden, Peter]
Upgrade of the UHV system to a larger turbo pump began today. After obtaining a final RGA scan in the old configuration (Aiden to post), we vented
all three volumes and proceeded to disassemble the 4.5"-diameter pump line. We completed installation of the new 6"-diameter pump line to the point where |
|
Mon Oct 9 21:41:24 2023, Aiden, Update, Clean & Bake, Clean and Bake Batch 19
|
| Bagged and tagged the parts from batch 18. Started the Copper batch that includes all the gaskets needed to start the vacuum chamber upgrade. |
|
Mon Oct 9 16:59:21 2023, Shane, Jon, Update, CDS, timing chassis power cable and AI chassis testing for CyMAC
|
[Shane, Jon]
Today's CyMAC work:
Finished assembling external power supply cable for the timing
chassis (see attached image)
Also did some debugging of AA and AI chassis re: power issues. After testing voltages at various test points
on the power regulator board (TP1-TP6) in the AA chassis, it seems like it's the source of the problem. Used bench DC power supply to test, running 15V, |
|
Mon Oct 9 11:29:37 2023, Tyler, Update, Electronics, PSD/CSD Plot Updates
|
Continuing from Sophia's SURF Project this summer: Plotting the Power-Spectral Densities (PSDs) and Cross-Spectral Densities of two signals.
A continued
issue that has been observed in the plots is the random "jump" of one PSD curves. Below, a 1.4 kHz signal is driven with a magnitude of 0.7 Vpp, and connected
to the two output ports of the Red Pitaya via an SMC T-Adapter. At the moment, I anticipate that this bug might have something to do with the Real-Time |
|
Mon Oct 9 11:06:17 2023, Peter, Update, VLC Update, VLC Launch Chain
|
Implemented the new stage for the EOM. Took power data at different positions in the launch chain. Beam waist: 0.066mm (beam waist is inside EOM). Power
before EOM: 0.473mW. Power after EOM: 0.452mW. Power after Faraday Isolator: 0.415mW. Might need to adjust better to configure for clipping losses. Images
of setup are attached below. |
|
Sat Oct 7 17:10:27 2023, Aiden, Update, Clean & Bake, Clean and Bake Batch 18
|
Bagged and tagged the parts from Batch 17 and placed them in the clean room on the optic table. Also started an aluminum batch of parts that included the
kf clamps and the heater mounting parts. |
|
Tue Oct 3 15:07:48 2023, Aiden, Update, Clean & Bake, Clean and Bake Batch 17
|
| Cleaned and baked all the stainless steel parts in Batch 17. Check data base for more details on this. |
|
Fri Sep 29 17:27:30 2023, Shane, Jon, Update, CDS, Timing chassis assembly progress (CyMAC)
|
Worked on timing chassis assembly today for the CyMAC, settled on layout (see attachment 1). Frequency synthesizer and frequency divider tentatively mounted.
Next steps involve putting together and installing an LED and DC on/off switch assembly like the one in the binary input chassis (attachment 2 for comparison;
orange and black wires in BI chassis analogous to red and black wires in timing chassis). Will also use front and back panels of BI chassis as a template |
|
Fri Sep 29 11:53:54 2023, Shane, Update, Cleanroom, 5 zone particle count measurement in cleanroom
|
| Today's 5 zone measurement of cleanroom particulate concentration is attached |
|
Fri Sep 29 11:22:33 2023, Shane, Aiden, Update, Cleanroom, cleaning and particle count
|
[Aiden, Shane]
cleaning cleanroom and particle count
10:06 am: ran zero count test on particle counter
10:07 am: started particle count
zone 3: 0.3 u: 22030.5
u: 8311.0 u: 540
zone 4: 0.3 u: 3740.5 u: 1241.0 u: 124
10:25 |
|
Thu Sep 28 15:17:13 2023, Aiden, Update, Clean & Bake, Clean and Bake Batch 16
|
| Bagged and Tagged the parts from batch 15 and started baking batch 16 which includes the 6" to 8" reducer. |
|
Fri Sep 15 17:33:35 2023, Aiden, Update, VAC, Vacuum Chamber Baking Update
|
Took some more RGA data and see that the chamber has gotten much cleaner since monday. Next step would be another bake with some focus around heating the
RGA filament more. The pressure in the chamber before testing was 5.32 e-8 torr. |
|
Thu Sep 14 17:05:38 2023, Shane, Jon, Update, CDS, Timing chassis setup and testing
|
Tested the setup today for the timing chassis (intended to provide the timing reference for the CyMAC). Was able to read the correct frequency, but voltage
was significantly lower than needed. Still identifying source of problem, and looking into the relationship between the supportable ohm load and the voltage. |
|
Tue Sep 12 15:31:31 2023, Aiden, Update, Clean & Bake, Clean and Bake Batch 15
|
Cleaned and Baked the SS screws for the heater mount. Check the Clean and Bake data base on the website to get a precise list of the parts and their numbers.
Cleaned them with liquinox in the ultra sonic washer for 10 minutes. Then dried them with nitrogen. Then put the stainless steel parts into the oven for
the following steps; 1. Ramp to 100 C in 15 minutes 2. Dwell at 100 C for 30 minutes 3. Ramp to 200 C in 30 minutes 4. Dwell at 200 C for 48 hours 5. Turn |
|
Mon Sep 11 16:02:42 2023, Aiden, Update, VAC, VAC System Heating Update
|
The chamber has cooled down from bake 5 and I took the first set of data. The pressure measured during the RGA measurements reached 9.98 e-8 torr. The data
shows that the chamber got dirtier, however this has been the case for every first scan after a bake so I assume there are still some more hydrocarbons
to be vacuumed out and that the second scan will most likely give a better idea of where the chamber is at. After turning off the RGA the pressure immediately |
|
Fri Sep 8 16:10:43 2023, Aiden, Update, VAC, VAC System Heating Update
|
Turned off the PID controllers to let the chamber cool down. Final temperatures for the RGA cross and Turbo pump cross were 113 C and 80 C respectively.
The system should be cool enough to start taking measurements on Monday. |
|
Thu Sep 7 19:24:25 2023, Peter, Update, VLC Update, VLC Launch Chain
|
The launch optics up to the Faraday Isolator have been added to the breadboard. In the first image, the optics are (from L to R) the stirring mirror, half-wave
plate, polarizing cube, 100mm f lens, electro-optical modulator, Faraday isolator, 50mm lens (not part of final design), stirring mirror (not part of final
design) |
|
Tue Sep 5 16:43:19 2023, Aiden, Update, General, VAC System Heating Update
|
Checked on bake 5 today after 3 days of equilibrium. The RGA cross is at 106 C and the turbo pump cross is at 74 C. This was reached while the PID controllers
were at 140 C. I will now slowly raise the temperature to 150 on the PID controllers and see if the difference in the RGA cross can be reduced. |
|
Fri Sep 1 19:21:19 2023, Aiden, Update, VAC, VAC System Heating Update
|
Started bake 5 today. This will hopefully be a longer and hotter bake with it lasting 6-7 days at around 150 C. The pressure in the chamber before removing
the full range gauge and RGA box was 5.01 e-8 torr. The Argon leak was also left open for this bake to hopefully get rid of particulates on it. I also
put the heater tape I removed last time back onto the RGA cross. This made the heating up process take much longer as I had to not increase too much or |
|
Thu Aug 31 12:56:29 2023, Aiden, Update, VAC, Vacuum Chamber Baking Update
|
Took some more RGA data to see if the HC levels have further declined since bake 4 and it seems that it has started to plateau with August 29 160.7 e-10
Torrl/s and August 31 giving 158.4 e-10 Torrl/s. The pressure of the chamber before taking data was 5.1 e-8 Torr. I have attached an overlay of the data
from August 29 and August 31. It seems that the extra two days has not noticeably changed the data and another bake will most likely be needed to meet |
|
Tue Aug 29 22:07:38 2023, Aiden, Update, General, Electronic Bench
|
Dr Richardson is working on mounting more power supplies in the server rack and is using the electronics bench. Be aware to not move anything on the bench
itself. |
|
Tue Aug 29 19:09:21 2023, Aiden, Update, VAC, Vacuum Chamber Baking Update
|
Here are some more plots with the RGA data take August 29. It seems that more pumping time has led to the HC levels being dramatically reduced compared
to only a day ago. The pressure also rises significantly when turning on the RGA filament and it doe not go back down to the pressure before turning it
on while the RGA is still running. The pressure after I left was 6.86 e-8 torr. |
|
Mon Aug 28 14:43:50 2023, Aiden, Update, VAC, Vacuum Chamber Baking Update
|
The PID controllers were turned off on Friday and the chamber was left to cool over the weekend. Just took data and it looks like signal to noise ratio
is pretty bad again. I do not know if this means we need a hotter bake or if the chamber needs some more time to cool down. I will overlay this data and
make sure to take a second set a bit later to compare. Some good news though is that the chamber has reached a pressure below 10e-8 torr with the full |