 Thu Jun 22 13:58:00 2023, Pamella, Julian and Shane, Update, Cleanroom, Cleaning and Particle Count
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[Pamella, Shane, and Julian]
cleaning cleanroom and particle count
12:00 pm: started particle
count
Zone 3
0.3u: 3533
0.5u: 540
1.0u: 166
Zone 4
0.3u: 290
0.5u:
124
1.0u: 41
12:31 pm: Started checking the surface inside the cleanroom and began surface wipedown
12:50 |
Fri Apr 7 09:48:09 2023, Pamella, Update, General, Clean the system parts 7x
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Pamella and Julian wiped and tag system parts for the vacuum machine. We used isopropyl and vectra wipes in the most import pieces:
Inverted magnetron
pirani gauge and the air cooling kit 81. The other parts we uses the IPA wipe for cleaning.
So for now we finished with ever system parts which was in
the gabinetes.
I put photos below. The photos is for all part we cleaning, tag and which puted inside the cleaning room. |
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Wed Mar 22 15:25:00 2023, Shane, Update, General, Clean room recertification particle counts
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Attached are the five zone particle measurements for the clean room now that the fan speeds have been set to MEDIUM. 2 min sample time, 3 samples per zone.
The occupied clean room measurements were unusual in that they generally got larger towards minute 6 instead of settling and going to zero, and for this
reason didn't stay beneath the class 5 requirement at the end of the samples. The unoccupied counts look more similar to what was expected, and generally |
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Thu Feb 23 13:32:55 2023, Shane, Update, General, Clean room floor particle counts
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Here are the counts from the clean room floor today. The counts should be dated- the ones from today (2/23/23) are the last 8 in the chart. The first set
of 2 measurements from today were under the table by the clean room entrance, the next two were under the table by the vacuum chamber, the next two were
on the floor by the vacuum chamber lid, and the last two were on top of the table for comparison. All measurements were taken using 2 minute sample time. |
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Thu Mar 9 13:51:42 2023, Shane, Update, General, Clean room counts 3/9/23
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Here's the clean room counts from this morning. Also attached is rough diagram of where the five zones are in the clean room. Counts taken with 2 minute
sample time, three samples in each zone. |
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Mon Dec 2 13:35:45 2024, Luke , Update, General, Clean and bake of Viton O-rings
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[Luke, Luis]
We couldn't access the bake log on the wiki. (see attached) So we looked in the documentation provided on the DCC to find at what temperature to
bake the Viton O-rings. We found that we should bake Viton at 180°C for 24 hours. |
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Sun Dec 17 21:04:15 2023, Jon, Infrastructure, Clean & Bake, Clean and bake lab migrated to 1129
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[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
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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.
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Fri Mar 31 14:23:13 2023, Pamella, Update, General, Clean and bake batch 11
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Today I bagged and tagged batch 11. I wiped the some tools: Centering ring alum( 2 pieces), reversible ratcheting, gasket removal (CF). After wiped that
I bagged and tagged this parts and put inside the cleanroom.
Also I wiped one power cable (3 meters), bagged and tagged that and inside the cleanroom.
I put photo below. |
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Fri Mar 17 19:46:39 2023, Aiden, Summary, General, Clean and Bake batch 9
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Bagged and Tagged the reflector arms and bases and placed them inside the clean room. Total of 2 bags used. Cleaned and Baked parts in batch 9 on the spread
sheet and used the following procedure;
1. Ramp to 100 degC in 15 min.
2. Dwell at 100 degC for 30 min.
3. Ramp to 200 degC in 30 min.
4. Dwell at
200 degC for 48 hours.
5. OFF
Also soaked the 2.75" CF gate valve in acetone to try and clean the open threads around the part. Then cleaned it in |
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Tue Mar 14 18:21:41 2023, Aiden, Summary, General, Clean and Bake batch 8
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Starting off Peter and I refilled the deionized water barrel.
Then Aiden Cleaned and Bake the FROSTI arms and bases in liquinox for 5 minutes. Then placed
them in the oven where they will undergo the following steps;
1. Ramp to 100 degC in 15 min.
2. Dwell at 100 degC for 30 min.
3. Ramp to 120 degC in
30 min.
4. Dwell at 120 degC for 48 hours.
5. OFF
Also cleaned the 2.75 MDC Gate valve for 20 minutes (10 minutes each side) in liquinox. It looks |
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Wed Mar 8 19:29:00 2023, Aiden, Summary, General, Clean and Bake batch 7
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Today gave another cleaning to the MDC gate valve. It is still very dirty an will need more cleaning. I also cleaned the other 3 valves and the argon leak.
These are also in bags inside the clean room. I cleaned them by hand with IPA wipes and had to specifically give the MDC up to air valve a harder clean
with acetone as it was not getting clean with the IPA. This valve still has a ring around the face as shown in the first image. Be very cautious when moving |
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Tue Feb 28 19:37:22 2023, Aiden, Summary, General, Clean and Bake batch 5
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Bagged and Tagged batch 4 parts by placing no more than two part numbers per bag and taped them with kapton tape and labeled them with their name and part
number. Then placed them in the clean room on the work bench. Cleaned batch 5 part (Viton O-Ring) with liquinox and placed the into the oven for 5 steps;
1. Ramp to 100 degC in 15 minutes. 2. Dwell at 100 degC for 30 minutes. 3. Ramp to 180 degC in 30 minutes. 4. Dwell at 180 degC for 48 hours. 5. Turn off |
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Tue Feb 21 17:51:04 2023, Aiden, Summary, General, Clean and Bake batch 4
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Bagged and Tagged batch 3 parts by placing no more than two part numbers per bag and taped them with kapton tape and labeled them with their name and part
number. Then placed them in the clean room on the work bench.
Cleaned batch 4 parts with liquinox and placed the into the oven for 5 steps;
1. Ramp
to 100 degC in 15 minutes.
2. Dwell at 100 degC for 30 minutes.
3. Ramp to 200 degC in 30 minutes.
4. Dwell at 200 degC for 48 hours.
5. Turn off and |
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Fri Feb 17 19:12:39 2023, Aiden, Update, General, Clean and Bake batch 3
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Bagged and Tagged batch 2 parts by placing no more than two parts per ESD bag then taped them with kapton tape and tagged them with their name and part
number. Than placed them inside the clean room on the work bench. Total of 3 Bags used.
For Batch 3- Cleaned all copper gaskets with liquinox for 10
minutes, dried them off with nitrogen, then placed into oven where the are currently undergoing the following steps;
1. Ramp to 100 deg C in 15 minutes.
2. |
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Mon Feb 13 18:57:53 2023, Aiden, Summary, General, Clean and Bake batch 2
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Cleaned second batch of SS parts with liquinox for 20 min. Then put in oven for 5 steps; 1. Ramp, 100 degC, 15 min 2. Const, 100 degC, 30 min 3. Ramp, 200
degC, 30 min 4. Const, 200 degC, 48 hours 5. Ramp, 25 degC, (off). |
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Wed Jul 5 16:02:12 2023, Aiden, Update, Clean & Bake, Clean and Bake batch 14 Bagging
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| Bagged and Tagged the 2.75" copper gaskets from Batch 14 and placed them into the clean room on the work bench. |
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Mon Apr 17 17:06:49 2023, Aiden, Summary, General, Clean and Bake batch 11
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Cleaned the Viton O-Ring for the main chamber in Liquinox for 10 minutes. Then put it in the oven to back for;
1. Ramp to 100 degC in 15 min.
2. Dwell
at 100 degC for 30 min.
3. Ramp to 180 degC in 30 min.
4. Dwell at 180 degC for 24 hours.
5. Off
Note: There were three viton -rings in the bag sent
to us. I cleaned and baked 2 of them and left the third in the bag. |
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Fri Mar 24 13:36:17 2023, Pamella, Update, General, Clean and Bake batch 10
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Today I bagged and tagged batch 10.
I wiped the RGA vacuum component for around 25 minutes after that I bagged and tagged this part and put inside the
cleanroom. The RGA vacuum component have a big size and because off that i used the big bag.
I wiped one power cable (2 meters), bagged and tagged that
and inside the cleanroom.
For the parts in the oven, a bunch of screws, I bagged and tagged the screws and put inside the cleanroom.
I put photos below |
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Fri Apr 28 19:39:19 2023, Cao, Summary, General, Clean and Bake Leybold TTR 91 Pirani Gauge
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Quote:
I took batch 12 out of the oven and put
them in a bag and placed the bag inside the clean room in the first large stainless steel container.
I also looked at the small gauge that we felt like |
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Fri Mar 3 19:13:33 2023, Aiden, Summary, General, Clean and Bake Batch 6
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Started to clean the dirtiest of the valves. I could not finish but I definitely made good progress on it. The MDC valve is very dirty and there are many
places I could not reach with my fingers. I used Acetone and IPA for this first round of cleaning on it.
I also was going to bag the viton O-Ring from
the previous Batch, however it seems to have broken during the bake and I am leaving it inside the oven for now. |
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Mon Nov 27 19:34:50 2023, Aiden, Update, Clean & Bake, Clean and Bake Batch 20 Bagging
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| Bagged and tagged bath 20 which included the macor hardware and place it inside the clean room on the table. |
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Mon Nov 20 20:37:45 2023, Aiden, Update, VAC, Clean and Bake Batch 20
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[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. |
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Mon Oct 9 21:41:24 2023, Aiden, Update, Clean & Bake, Clean and Bake Batch 19
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| Bagged and tagged the parts from batch 18. Started the Copper batch that includes all the gaskets needed to start the vacuum chamber upgrade. |
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Sat Oct 7 17:10:27 2023, Aiden, Update, Clean & Bake, Clean and Bake Batch 18
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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. |
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Tue Oct 3 15:07:48 2023, Aiden, Update, Clean & Bake, Clean and Bake Batch 17
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| Cleaned and baked all the stainless steel parts in Batch 17. Check data base for more details on this. |
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Thu Sep 28 15:17:13 2023, Aiden, Update, Clean & Bake, Clean and Bake Batch 16
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| Bagged and Tagged the parts from batch 15 and started baking batch 16 which includes the 6" to 8" reducer. |
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Tue Sep 12 15:31:31 2023, Aiden, Update, Clean & Bake, Clean and Bake Batch 15
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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 |
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Fri Jun 16 17:40:28 2023, Aiden, Update, Clean & Bake, Clean and Bake Batch 14
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Cleaned and Baked the new and 2.75" copper gaskets for the vacuum system. Cleaned them with liquinox in the ultra sonic washer for 10 minutes. Then dried
them with nitrogen. Then put the copper parts into the oven for the following steps; 1. Ramp to 100 degC in 15 minutes 2. Dwell at 100 degC for 30 minutes
3. Ramp to 175 degC in 30 minutes 4. Dwell at 175 degC for 24 hours 5. Turn off
Also bagged and tagged the parts from Batch 13 and placed them into |
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Tue Jun 13 13:25:05 2023, Aiden, Summary, Clean & Bake, Clean and Bake Batch 13
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Cleaned and Baked the new 1.33" and 2.75" blanks for the vacuum system. Cleaned them with liquinox in the ultra sonic washer for 10 minutes. Then dried
them with nitrogen. Then put the two stainless steel parts into the oven for the following steps;
1. Ramp to 100 degC in 15 minutes
2. Dwell at 100 degC
for 30 minutes
3. Ramp to 200 degC in 30 minutes
4. Dwell at 200 degC for 48 hours
5. Turn off |
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Mon Apr 24 17:38:45 2023, Aiden, Summary, General, Clean and Bake Batch 12
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Today I Bagged and tagged the o-rings from batch 11 and placed them inside the clean room. I also cleaned batch 12 parts in liquinox for 10 minutes and
them placed them into the oven where they will undergo the following steps;
1. Ramp to 100 degC in 15 min.
2. Dwell at 100 degC for 30 min.
3. Ramp
to 200 deg C in 30 min.
4. Dwell at 200 deg C for 48 hours.
5. Off |
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Tue Feb 7 17:27:30 2023, Aiden, Physics, ELOG, Clean and Bake Batch #1
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Cleaned SS parts with liquinox for 20 min. Then put in oven for 5 steps;
1. Ramp, 100 degC, 15 min
2. Const, 100 degC, 30 min
3. Ramp, 200 degC, 30 min
4.
Const, 200 degC, 48 hours
5. Ramp, 25 degC, (off)
PS. Ultrasonic washer does not have heating feature. |
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Wed Mar 27 00:03:57 2024, Pooyan, Update, Computers, Chimay relocation to Physics 1129
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[Jon, Pooyan]
Moved Chimay from the server rack in Physics 1119 to a new rack in Physics 1129. It is connected to the switch in that rack
and has the same ip address as before.
All services are up and running.
It appears that JupyterHub creates some processes whenever a user
connects to an instance of it, but in some cases does not stop those processes after the user is not using that instance. This results in having lots of |
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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 Jul 24 16:19:29 2023, Shane, Jon, Update, Electronics, Chassis semi-assembled and moved
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Began assembly on AA and AI chassis today, moved them both to top work bench shelf (image attached). They are delicate so please do not disturb them or
put anything on top of them. |
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Tue May 9 20:55:12 2023, Jon, Infrastructure, VAC, Calibrated Ar leak rate
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For future reference, the calibrated Argon source has a leak rate of 7.55E-8 atm cc/s, or equivalently 5.74E-8
torr L/s. This can be used to calibrate RGA scans to units of physical leakage (outgassing) rate. |
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Sun Mar 24 11:50:37 2024, Aiden, Update, Clean & Bake, Cal Tech FROSTI Parts
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| Bagged the FROSTI legs and feet after the conclusion of the clean and bake. They are double bagged and sitting in the flow bench. |
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Tue Feb 13 13:02:41 2024, Pooyan, Update, Interferometer Simulations, Cacity sacn of Fabry-Perot
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| Created a simple model of Fabry-Perot cavity in SIS, and did a cavity scan. Total power in the cavity, 00 mode, and HOMs is measured. |
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Thu Jul 11 21:01:37 2024, Jon, Infrastructure, General, Cable tray installed in 1129
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Today I installed a 10' cable tray in 1129, for permanently routing Ethernet lines to the workstations. It is securely bolted to C-channels in the side
wall and in the center cable tray. |
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Tue Jul 30 07:42:47 2024, Jon, Infrastructure, General, Cable tray installed in 1119
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Yesterday I installed another 5' cable tray in 1119, for permanently routing Ethernet lines to the L-bench. It is securely bolted to the top of the electronics
rack, on one end, and to the top of the glass-door storage cabinet, on the other. This eliminates the need for the cable ramp which previously sat behind
the rack. |
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Mon Mar 6 15:32:58 2023, Jon, Infrastructure, General, Cabinet installation completed
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Jon, Cao, Peter
This morning Facilities delivered and installed two new cabinets with sliding glass doors.
The smaller of the two (36" W x 13" D x 84" H) has been installed in the Clean & Bake area adjacent the flow bench. The larger one (48" x 16" |
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Mon Jan 15 22:29:34 2024, Jon, Infrastructure, General, Cabinet installation & lab clean-up completed
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[Jon, Tyler, Aiden, Shane, Pooyan, Michael, Cynthia, Luke]
On Wednesday, we completed long list of work towards making the new lab (1129) fully operational and enabling the next phase of FROSTI testing.
Cabinet Installation
Three new VWR cabinets with sliding glass doors were installed in 1129. Each unit measures 48" |
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Fri Jun 14 13:32:13 2024, Liu, Update, Scripts/Programs, COMSOL simulation on rectangular heater elements design 6x
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I have been looking at the feasibility of an alternative heater element design for FROSTI that replaces the original ring-like heater elements with n
rectangular elements with straight edges. They form an n-sided regular polygon that could well approximate the original annular ring if n is large enough.
This eliminates curved surfaces requirement for the heater elements, which was the source of the many month production delay for the prototype parts. |
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Fri Jun 21 11:47:30 2024, Liu, Update, Scripts/Programs, COMSOL simulation on alternative straightened heater elements design 6x
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In the previous post, we saw that for the heater element design with straight
edges in replacement of the current eight-element ring-like design, it provides the similar Gaussian-like irradiance profiles, but with smaller power delivery
efficiencies, as shown in the plot. This turned |
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Mon Jun 10 14:52:38 2024, Tyler, Update, FLIR, CIT FROSTI Analysis Update
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[Tyler]
Upon further inspection, one adjustment was made to the FROSTI profile analysis: changing the transmission value of the ZnSe viewport. It
was initially assumed that the viewport possessed an AR coating, which would bring the transmission into the 90% range. Without the coating, it drops to
roughly 70%. Assuming no coating, the estimated delivered power was calculated to be 11.7 W. This is consistent with the estimated power given from the |
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Tue Jun 3 11:54:06 2025, Cece Ochoa, Update, , CE Cavity Design Update
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| Update on the design for the CE Cavity Mirrors |
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Fri Jul 5 14:12:32 2024, Liu, Update, Interferometer Simulations, CE BS Mechanical Resonances
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The butterfly and drumhead mechanical modes for the aLIGO BS were calculated in COMSOL. The resonant frequencies for the two acoustic modes are 2.45
kHz and 3.61 kHz, matching the results in reference
for instance.
For a quick projection for the resonant frequencies going from aLIGO to CE, the height and width of the BS are increased assuming |
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Tue Jun 3 11:50:08 2025, Pooyan, Update, CDS, CDS update
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There are three major issues with the lab's CDS system that should be addressed. They are ordered from the highest priority to the lowest.
CyMAC has stopped serving the fast channels (65k Hz)The channels are still there, and the data from the slow (16 Hz) channels is served correctly, but the fast data is not served. As a result, diagggui |
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Tue Jun 10 12:11:14 2025, Pooyan, Update, CDS, CDS update
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The MEDM models issue was fixed. The issue was that building the c1msc model alone was not enough and we had to re-build the c1iop as well, although
no changes has been made to the c1iop. Added a note in the wiki on this for future reference.
For
writing the fast channels to the frame files, our CDS system should have a GDS broadcaster. I followed this |
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Wed Jun 11 16:19:37 2025, Pooyan, Update, CDS, CDS update
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Fast channels recorded to .gwf frame files
Had to add a DAQ Channels block to the c1msc model for those channel to be recorded in the
.gwf frame files. The block is in the CDS_PARTS, and I just had to copy it to our model. Here is the example text for the channels: |