 Wed Jan 31 14:37:26 2024, Shane, Summary, CDS, path directions for CyMAC model and parts library
|
Path to cds parts library in Matlab simulink: /usr/share/advligorts/src/src/epics/simLink. File name CDS_PARTS.mdl
Path to user models: /opt/rtcds/usercode/models,
using file name c1msc.mdl |
Tue Jan 23 12:17:41 2024, Tyler, Update, Electronics, RTD Chassis 
|
After updating the wiring in the RTD Chassis, a signal is now seen at each ADC input. However, there seems to be a discrepancy between the voltages
I measured out with the multimeter (see below). Next steps include:
Finish final debugging
Calibrate ADC inputs with known voltage source (likely to use DAC).
Voltage Readings:
|
 Tue Jan 30 11:36:19 2024, Tyler, Update, Electronics, RTD Chassis
|
Quote:
After updating the wiring in the
RTD Chassis, a signal is now seen at each ADC input. However, there seems to be a discrepancy between the voltages I measured out with the multimeter (see |
|
Thu Jan 18 18:06:49 2024, shane, Update, Cleanroom, cleanroom 5 zone particle count measurement
|
| Here's today's full five zone measurement of the cleanroom |
|
Thu Jan 18 15:13:37 2024, Aiden, Update, VAC, VAC Heating System Update
|
[Aiden]
Took more data today and the chamber and elements are showing an even lower HC level than we have gotten before. It is safe to say that the
elements are not contaminated and out gassing HC into the chamber. |
|
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 |
|
Mon Nov 20 10:10:50 2023, Tyler, Configuration, Electronics, RTD Logic/Schematic Diagrams
|
Below are a basic diagram of what the RTD measurement circuit logically looks like and an example schematic of the actual wiring. The schematic wiring
will be placed internally into a chassis, connected to the RTDs via DB25 cable.
Note: The DB25 Breakout Board connector is Female, not Male. |
|
Fri Dec 29 16:02:27 2023, Jon, Configuration, Electronics, RTD Readout Chassis
|
The custom front and rear panels for the RTD readout chassis arrived last Friday. I installed them in the chassis frame to check their fit. They fit
very well, so all that now remains is to complete the internal wiring and test the connections.
The chassis panel designs are archived to LIGO-D2300452 and LIGO-D2300453. |
|
Tue Jan 9 12:08:59 2024, Tyler, Configuration, Electronics, RTD Readout Chassis Update
|
Below is the current state of the RTD readout chassis wiring. Initial continuity tests seem good, will run through one more time to confirm.
Quote:
The custom front and rear panels for |
|
Tue Jan 16 12:20:21 2024, Tyler, Configuration, Electronics, RTD Readout Chassis Update 2
|
I performed another continuity test on the RTD chassis wiring, and everything seems to be set up correctly. The chassis should be ready for installation.
Quote:
Below is the current state of the |
|
Tue Jan 16 10:01:21 2024, Peter, Update, VLC Update, VLC Faraday Isolator and Mode Matching
|
| Attached is a PDF of my weekly updates. |
|
Wed Jan 10 15:27:18 2024, Shane, Update, Cleanroom, cleanroom cleaning and particle count
|
[Aiden, Shane]
cleaning cleanroom and particle count
2:03 pm: changed sticky floor mats
2:05 pm: started particle count
zone 3: 0.3 u: 48630.5 u: 12051.0
u: 872
zone 4: 0.3 u: 19530.5 u: 7891.0 u: 457
2:35 |
|
Tue Jan 9 16:35:09 2024, Aiden, Update, VAC, VAC System Leak and Heating
|
[Luis, Luke, Aiden]
Leak tested each flange and weld and only found two flanges to have noticeable leaks with the electron multiplier on. These were
the turbo pump flange and the RGA flange that connects to the cross. The RGA one is rather new as it has not had a measurable leak before and it was around
2 e-8. We then applied the new sealant to these two flanges as directed by the instructions on the packaging.
Then after waiting a few minutes for |
|
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 |
|
Sun Dec 17 21:04:15 2023, Jon, Infrastructure, Clean & Bake, Clean and bake lab migrated to 1129
|
[Jon, Tyler, Aiden, Luke]
On Friday we completed assembly of the new stainless steel-topped benches in 1129. We then moved the clean and bake equipment from 1119 to its
new larger space in 1129. This included the HEPA flow bench, ultrasonic washer, deionized water drum, nitrogen tanks, and forced-convection oven. The oven |
|
Wed Dec 20 10:33:34 2023, Jon, Infrastructure, Clean & Bake, Clean and bake lab migrated to 1129
|
Update: I have completed permanent routing of the electrical cables. I also ran the ultrasonic washer's drain line to
the sink drain (the current hose does reach). The new clean and bake lab is now fully operational.
|
|
Tue Dec 19 15:45:05 2023, Aiden, Update, VAC, Vacuum Chamber Baking Update
|
| Took RGA data for the macor parts inside of the chamber. With the Ar open the HC levels read 30 torrl/s which is around where it was before the bake. |
|
Mon Dec 18 15:51:49 2023, Aiden, Update, VAC, VAC System Heating Update
|
After letting the chamber cool down I put the electronics back on and turned the RGA element back on. No data has been taken yet as to let the pressure
continue to fall as the RGA is powered. |
|
Sun Dec 17 19:43:18 2023, Aiden, Update, VAC, Vac Heating Update
|
[Aiden]
I measured the temperature of the flanges where some of the electronics will go and I found that the RGA flange was at 55C and the two full
range gauges were at 65C. I also stopped bake 9 to cool down for measurement. |
|
Fri Dec 15 14:03:02 2023, Aiden, HowTo, VAC, Vacuum Chamber Opening
|
[Aiden]
1. Turn off the RGA filament and disconnect it.
2. Record the pressure and then close the angle valve and gate valve on the RGA line
to isolate it from the system.
3. Turn off the backing and turbo pump and let the turbo pump spin to a stop by slowly leaking the chamber. The slower
the safer.
4.Slowly open the vents on the chamber and the turbo pump. Making sure not to raise the pressure too fast.
5. Once done venting |
|
Mon Dec 11 16:20:17 2023, Jon, Summary, TCS, FROSTI Assembly Procedure
|
Below is the procedure we will follow to assemble the FROSTI prototype.
Install SS guide rods and bottom Macor spacers in bottom reflector
Install AlN elements on top of bottom Macor spacers
Install
upper Macor spacers on top of AlN elements
Feed unterminated power and RTD leads through slots in upper reflector
Install upper reflector, |
|
Mon Dec 11 12:58:57 2023, Shane, Luis, Update, CDS, DAC-ADC loopback test debugging
|
[Luis, Shane]
Working on debugging last week's weird results for the ADC-DAC loopback test for channels 14 and 15. With DAC output channels 12-15 connected
to ADC input channels 12-15: tried setting matrix coefficients for channels 12-15 to 1, and as with last week's results, DAC is outputting as expected
for all three channels and ADC is not reading in the signal (hovering around -4,-5) for channels 14 and 15. Channels 12 and 13 still reading in correctly. |
|
Thu Nov 30 13:50:32 2023, Tyler, Update, Lore, Workbench Assembly Completed
|
[Tyler, Luke, Aiden]
The workbenches are now completely assembled and put into their final places. Additionally, the tool chest has been moved.
|
|
Sat Dec 9 12:34:12 2023, Jon, Update, General, Electronics workshop migrated to 1129
|
[Jon, Tyler, Shane, Luis]
On Wednesday we completed the migration of the electronics workshop from 1119 to the large new workbenches in 1129. The two workstations pictured
closest to the front of the room are for electronics assembly and testing, while the two in the rear will house LIGO CDS workstations. We moved all of |
|
Fri Dec 8 11:15:21 2023, Peter, Update, VLC Update, VLC Assembly
|
The optics of the visible light cavity have been assembled. The mode matching telescope is folded through the two stirring mirrors at the corners shown
in the image below, with the first lens (f=0.2m) before the first stirring mirror, and the second lens (f=0.5m) between the two stirring mirrors. The distance
from the cavity to the edge of the table is 14cm. There is still some work to be done on the alignment of the cavity, as the beam does not seem to be completely |
|
Thu Dec 7 14:13:15 2023, Shane, Update, Cleanroom, cleanroom cleaning and particle count
|
[Aiden, Shane, Michael, Luke, Cynthia]
cleaning cleanroom and particle count
12:30 pm: ran zero count test on particle counter
12:32 pm: started particle count.
zone 3: 0.3 u: 59,488
0.5 u: 95611.0 u: 706
zone 4: 0.3 u: 77320.5 u: 19121.0 u: 290
|
|
Thu Dec 7 12:42:42 2023, Aiden, Update, VAC, Vacuum Chamber Baking Update
|
After leaving the RGA on for a few days the chamber has settled at 2.01 e-8 torr. I also have good news that the chamber looks to be even cleaner as the
HC levels are now the lowest they have been being at 26 e-10 Torr l/s. |
|
Mon Dec 4 21:27:53 2023, Shane, Update, CDS, ADC-DAC loopback test results
|
Here are the test results from today's ADC-DAC loopback tests. Channels 14 and 15 were the only ones behaving abnormally. Not sure what the issue is, but
needs further debugging. The DAC output was as expected for both of them, but the corresponding ADC inputs were the same regardless of what offset was
used (hovering around values of -4 and -5). NOTE: all measurements listed in the attached table are 'averages' in the sense that the ADC inputs and DAC |
|
Mon Dec 4 11:19:50 2023, Aiden, Update, VAC, Vacuum Chamber Baking Update
|
[Aiden]
Took some RGA data of the chamber after it has been cooling down. I do not believe that this data accurately shows the HC levels in the chamber
as the pressure is still above where it was at before the bake and was still falling. I believe more time is needed to let the pressure fall and for the
RGA filament to remain on to return to a point where the data can be trusted. |
|
Sat Dec 2 18:10:23 2023, Aiden, Update, VAC, VAC System Heating Update
|
[Aiden]
Turned off the heating tape today in anticipation to take more RGA data on Sunday or Monday morning before the meeting. |
|
Thu Nov 30 13:58:18 2023, Aiden, Update, VAC, VAC System Heating Update
|
[Aiden]
Came into the lab in the morning to check on the chamber heating. I decided to set the PID controllers to 110C rather than 120C as the chamber
lid and wall were reading near 140C. With the PID controllers at 110C the chamber lid and wall now read 126C and 132C. Currently the PID controllers are
placed on the cross in front of the RGA and the reducing nipple in front of the turbo pump. I believe this is a good equilibrium and will leave the tape |
|
Wed Nov 29 21:13:32 2023, Aiden, Update, VAC, VAC System Heating Update
|
Started Bake 8 today. Set the PID controllers to 120 C and will check in the morning for equilibrium temperatures for the lid and chamber wall. The chamber
pressure was 2.13 e-8 torr before taking off the full range gauges.
After the bake is done on Saturday it will be cooled down and RGA data will
be taken to measure the out gassing rate of the stainless steel fasteners inside the chamber. Then on Tuesday we will plan to vent and open the chamber |
|
Mon Nov 27 19:34:50 2023, Aiden, Update, Clean & Bake, Clean and Bake Batch 20 Bagging
|
| Bagged and tagged bath 20 which included the macor hardware and place it inside the clean room on the table. |
|
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.
|
|
Wed Nov 22 15:46:50 2023, Shane, Update, CDS, DB25 signal connections for FROSTI heaters
|
[Shane, Jon]
Installed new DC smart switch in electronics rack, configured power connections. Images attached. Attached is a diagram of the male DB25 signal connections
to be used for FROSTI heaters. Also included below is table detailing pin and signal configuration.
|
|
Thu Nov 23 12:34:44 2023, Jon, Update, CDS, DB25 signal connections for FROSTI heaters
|
Update: I was able to put the FROSTI power controller on the lab network. It is connected to the switch in the top of the rack and is assigned
a static IP address of 192.168.1.12 and an NDS hostname of relay1.
The controller can be remotely accessed through an SSH command line interface as well as an HTML webpage, which can be opened from any web browser |
|
Tue Nov 21 22:09:44 2023, Aiden, Update, General, Testing Parts 8x
|
[Aiden, Luis]
Luis and Aiden vented the chamber today. We closed off the RGA section and then proceeded to open the the vent on the main body after
turning off the turbo and backing pump. We then opened the lid and placed in all the stainless steel hardware that will be used in evaluating the FROSTI
optics and heater elements. We also inspected the weldments before closing it up. Check the clean and bake data base where there is now a new section outlining |
|
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. |
|
Mon Nov 20 20:45:16 2023, Aiden, Update, VAC, Leak Test
|
[Aiden, Luis]
Tested every weld and flange to find leaks. Only found that the flange on the turbo pump and reducing nipple was still at 2e-9
torr on the leak. The chamber still rose in pressure when the two gate valves were closed but no noticeable leak could be found on the lid or welds. |
|
Mon Nov 20 20:37:45 2023, Aiden, Update, VAC, Clean and Bake Batch 20
|
[Aiden, Luis]
Started to clean and bake the macor parts for the FROSTI reflector. Per LIGO documentation cleaned the macor in liquinox for 10 minutes and
put them in the oven at 200 degC for 24 hours. |
|
Fri Nov 17 14:06:01 2023, Shane, Update, Cleanroom, 5 zone particle count
|
Here's today's 5 zone particle count measurement for the cleanroom. Zone 5 (closest to back wall by fire cabinet) is still above the limit for the larger
size ranges; everything else is in good shape and roughly 10 times under the limit. Not sure why zone 5 is still so dirty (maybe some of the electronics
being stored in bags/bins on the upper shelf of the desk aren't clean?) but will focus cleaning efforts on this zone next time. |
|
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 |