 Fri Jul 26 17:25:42 2024, Jon, Infrastructure, Computers, New workstation ws4 installed in 1129 
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Today I installed the second desktop workstation in 1129. The new machine is an Intel NUC13ANHi5, with a 12-Core Intel i5-1340P CPU, 32GB DDR4 RAM, and
a 1TB SSD.
I loaded it with a fresh installation of Debian 12 and installed the LIGO CDS workstation (control room) tools. It is assigned the hostname ws4 |
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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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Wed Jun 11 16:33:45 2025, Pooyan, Update, Computers, Luke's ray tracing hosting
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Hosted Lukes model on Chimay. It's available at https://richardsonlab.ucr.edu/real-time-frosti
The
sourcecode is at Github. It is clones at /var/www/html/real-time-frosti, and
this is the block added to nginx config file at /etc/nginx/sites-available/default : |
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Sun Apr 10 15:39:49 2022, Rutuja Gurav, HowTo, Computer Scripts/Programs, HowTo: Renew the Let's Encrypt SSL certificate using certbot
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Port 80 is kept closed by default. This might be causing the certbot auto-renewal cronjob to fail. Therefore we must renew the certificate manually.
Step 1: Open port 80. (This is needed as the certificate renewal process runs some tests which requires client communication over |
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Wed Mar 1 21:27:20 2023, Jon, Infrastructure, Cleanroom, Over-table shelf height raised
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Jon, Cao
Today we raised the height of the shelf overhanging the cleanroom laser table by 8 inches. This was done to create more vertical clearance between
the top-loading vacuum chamber and the bottom of the shelf. The added clearance should make both removing the chamber lid and inserting large parts easier. |
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Wed Mar 22 12:16:20 2023, Jon, Infrastructure, Cleanroom, Experimenting with HEPA fan speeds
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Jon, Cao
In effort to try to reduce the noise level inside the cleanroom, we have dialed all four HEPA fan-filter units (FFUs) down from HIGH to MEDIUM
speed. These dials can only be accessed from inside the cleanroom, by bringing in the large ladder and opening adjacent ceiling tiles. |
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Tue Apr 4 16:52:08 2023, Jon, Update, Cleanroom, Particle counter docking station
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Due to the problems we have encountered trying to serially communicate directly with the Met One DR-528 particle counter, I went ahead and ordered the add-on
communications/charging dock. The dock "ethernetizes" the serial communications by wrapping them in TCP packets and transmitting them over the lab network.
This will allow our Python code to communicate using the standard Internet sockets package, rather than PySerial, PyNut, etc.
the docking station arrived |
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Wed Apr 26 18:05:41 2023, Pamella, Julian, Shane, Update, Cleanroom, cleanroom particle counts and cleaning log
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pre-cleaning particle counts:
zone 3
0.3 mu: 2494
0.5 mu: 748
1.0 mu 124
zone 4
0.3 mu: 374
0.5 mu: 41
1.0 mu: 0
3:45 pm: Started wiping
the surfaces(laser table,chamber, computer) inside the cleaning room.
4:05 pm: Finished wiped the surfaces
4:08 pm: Began vacuuming |
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Wed May 31 12:16:28 2023, Shane, Update, Cleanroom, cleanroom particle counts (full 5 zone measurement)
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| Attached is the full 5 zone particle measurement for the cleanroom after this week's cleaning, 5/31/23. |
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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 |
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Tue Jun 27 12:09:37 2023, Shane, Update, Cleanroom, cleanroom 5 zone particle count measurement
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Attached is 5 zone measurement for cleanroom particulate count. Zone 3 (in front of vacuum chamber) higher than usual, likely due to recent vac work. Slightly
above ISO class 5 standard in 1.0 micron range, measuring 997 particles/cubic meter while ISO standard is 832 particles/cubic meter in this range.
Zero
count test on particle counter performed prior to today's measurement. |
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Thu Jul 6 13:34:48 2023, Pamella, Shane, Julian, Aiden, Update, Cleanroom, cleaning and particle count
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[Pamella, Julian, Aiden, and Shane]
cleaning cleanroom and particle count
12:00 pm: started particle count
Zone 3: 0.3 u: 28260.5 u: 4571.0 u: 166
Zone 4: 0.3
u: 4570.5 u: 831.0 u: 41
12:17 pm: began surface check and wipedown. NOTE: found |
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Wed Jul 19 14:39:19 2023, Pamella, Shane, Aiden, Update, Cleanroom, cleaning and particle count
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[Pamella, Shane, Aiden]
cleaning cleanroom and particle count
1:10 pm: started particle count
Zone 3: 0.3 u: 2535 0.5 u: 2071.0 u: 41
Zone 4:
0.3 u: 7890.5 u: 411.0 u: 0
1:30 pm: began surface check and wipedown
1:41 pm: started vacuuming |
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Fri Jul 28 13:07:39 2023, Shane, Aiden , Update, Cleanroom, cleanroom cleaning and particle count 6x
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[Aiden, Shane]
cleaning cleanroom and particle count
11:08 am: started particle count
zone 3: 0.3 u: 4198 0.5 u: 1080 1.0 u: 581
zone
4: 0.3 u: 12470.5 u: 6231.0 u: 415
11:24 am: break for removal of vac chamber insulation (pictures |
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Fri Jul 28 13:39:39 2023, shane, Update, Cleanroom, full 5 zone cleanroom particle count
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| Here's the 5 zone cleanroom measurement from today. |
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Tue Aug 1 12:48:41 2023, Aiden, Update, Cleanroom, Pre Filter Change
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Changed the pre filter inside of the 3 stage HEPA system next to the soldering station. It was rather dirty and I have attached images with a clean
filter on the left and the used one on the right. I reset the pre filter age on the system. I tried to see if I could tell if the HEPA filter was dirty
but I could not see it. I did not reset the age of the HEPA or UV stations. They are currently 378 days old.
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Fri Sep 29 11:22:33 2023, Shane, Aiden, Update, Cleanroom, cleaning and particle count
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[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 |
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Fri Sep 29 11:53:54 2023, Shane, Update, Cleanroom, 5 zone particle count measurement in cleanroom
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| Today's 5 zone measurement of cleanroom particulate concentration is attached |
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Fri Oct 20 16:38:02 2023, Shane, Aiden, Update, Cleanroom, Cleanrooom cleaning and particle count
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[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 |
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Thu Nov 9 13:57:58 2023, Shane, Luis, Aiden, Tyler, Update, Cleanroom, cleanroom cleaning and particle count
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[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 |
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Thu Nov 9 19:06:46 2023, shane, Update, Cleanroom, 5 zone cleanroom measurement
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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.
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Fri Nov 10 14:16:04 2023, shane, Update, Cleanroom, new cleanroom zone diagram
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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. |
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Thu Nov 16 17:12:42 2023, Luis, Shane, Mohak, Update, Cleanroom, Cleanroom cleaning and particle count
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[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 |
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Fri Nov 17 14:06:01 2023, Shane, Update, Cleanroom, 5 zone particle count
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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. |
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Thu Dec 7 14:13:15 2023, Shane, Update, Cleanroom, cleanroom cleaning and particle count
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[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
|
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Wed Jan 10 15:27:18 2024, Shane, Update, Cleanroom, cleanroom cleaning and particle count
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[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 |
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Thu Jan 18 18:06:49 2024, shane, Update, Cleanroom, cleanroom 5 zone particle count measurement
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| Here's today's full five zone measurement of the cleanroom |
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Fri Feb 2 19:18:24 2024, shane, Update, Cleanroom, cleanroom cleaning and particle count
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[Aiden, Shane, Luis, Luke]
cleaning cleanroom and particle count
5:10 pm: ran zero count test on particle counter
5:14 pm: started particle count
NOTE: initial counts
are significantly above allowed limit. ~10 times larger than ISO class 5 standard in the smallest size range. Realized partway through ceiling tile changes |
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Wed Feb 7 12:43:22 2024, shane, Update, Cleanroom, cleanroom particle counts (full 5 zone measurement)
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| Here's today's full 5 zone measurement of the cleanroom. Everything is back under the requirement. |
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Tue Feb 20 11:31:49 2024, Tyler, Update, Cleanroom, Garment Cabinet Door Replacement
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[Luis, Luke, Pooyan, Tyler]
The replacement door for the HEPA garment cabinet arrived last week, and was installed on Thursday. However, it looks
like there's a small gap between the door and where the hinge is attached to the cabinet frame. No screws were provided with the replacement door. If we
want to perform any adjustments, we have to be very careful; the screws break very easily.
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Wed Feb 21 11:58:30 2024, Shane, Update, Cleanroom, cleanroom cleaning and particle count
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[Luke, Shane, Tyler]
cleaning cleanroom and particle count
11:50 am: ran zero count test on particle counter
11:55 am: started particle count
zone 3: 0.3 u: 17870.5
u: 5811.0 u: 166
zone 4: 0.3 u: 6230.5 u: 2901.0 u: 124
12:17 |
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Wed Apr 17 15:07:04 2024, Shane, Update, Cleanroom, Cleanroom cleaning and particle count
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[Mohak, Luke, Luis, Shane, Cynthia, Michael, Xuesi]
cleaning cleanroom and particle count
NOTE: particle counter was found dead, with the charging dock unplugged. For future reference, if you need to unplug
the dock, please either plug it back in when you're done, or make a note in an elog so someone else can come down and charge it. |
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Thu May 16 15:23:14 2024, Shane, Update, Cleanroom, Cleanroom cleaning and particle count
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[Luis, Michael, Luke, Shane]
cleaning cleanroom and particle count
1:45 pm: ran zero count test on particle counter
1:50 pm: started particle count
zone 3: 0.3 u: 2660 0.5
u: 3321.0 u: 41
zone 4: 0.3 u: 81060.5 u: 24941.0 u: 831
2:08 |
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Tue Jun 25 12:34:18 2024, Shane, Update, Cleanroom, cleanroom cleaning and particle count
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[Luke, Shane, Xuejun, Mohak, Michael, Tyler, Cynthia]
cleaning cleanroom and particle count
10:45 am: ran zero count test on particle counter
11:02 am: started particle count
zone 3: 0.3 u: 32840.5
u: 12471.0 u:332
zone 4: 0.3 u: 18290.5 u: 5811.0 u: 207
11:15 |
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Thu Jun 27 13:42:02 2024, Shane, Update, Cleanroom, cleanroom 5 zone particle count measurement
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Here's today's 5 zone measurement of the cleanroom. We're above the limit by a bit in zone three (all three size ranges), likely as a result of the recent
work installing FROSTI, so it could probably use another focused cleaning. Everything else is below the limit. |
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Fri Jun 28 10:43:13 2024, Xuejun, Update, Cleanroom, Frosti
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[Xuejun, Tyler]
We moved Frosti into the cleanroom and debugged it to make sure everything was working. One of the DB25 pins broke off at the connector
for element 1 so it needed to be recrimped. Element 6 short circuited but fixed with adjustment to the heater power pin position. We connected the power
and sensor connectors to the power box and recalibrated the RTD sensors.
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Mon Jul 29 14:30:16 2024, Tyler, Update, Cleanroom, RIN Measurement Set-up
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[Tyler]
I have begun moving parts into the cleanroom for the upcoming FROSTI RIN tests that will be conducted within the next few weeks. While waiting
for the rest of the equipment to arrive to perform the full-scale tests, I have additionally moved the FROSTI under the shelf above the optical table,
where it will stay for the meantime. As always, please use caution when in the cleanroom. Aside from the FROSTI, the IR photodetectors that will be used |
 Mon Aug 12 16:24:34 2024, Tyler, Update, Cleanroom, RIN Measurement Update 1
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[Tyler]
For some preliminary tests, I moved the IR photodetectors outside of the cleanroom and onto the other optical table. The basic goal was
to obtain a signal from both photodetectors. To achieve this, one of the heater cartridges used for early FLIR measurements months ago was hooked up to
a power supply (PS). The PS was set to supply 0.20 A with a voltage of 2.8 V; the corresponding power is thus 0.56 W. With this, I was able to measure |
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Thu Oct 3 19:35:04 2024, Shane, Update, Cleanroom, Cleanroom cleaning and particle count
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[Luke, Michael, Cynthia, Mary]
cleaning cleanroom and particle count
12:25 pm: started particle count
zone 3: 0.3 u: 46140.5 u: 8721.0 u:83
zone
4: 0.3 u: 24110.5 u: 4151.0 u: 83
12:48 pm: began surface check and wipedown, including |
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Thu Nov 14 10:46:20 2024, Luke , Summary, Cleanroom, Cleanroom cleaning
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[Luke, Luis, Michael]
cleaning cleanroom and particle count |
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Wed Jan 8 17:35:57 2025, Luke , Summary, Cleanroom, Cleanroom cleaning
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[Luke, Tyler, Cynthia, Shane, Michael]
Summary of Cleaning Activities:
We began cleaning Room 1119 at 2:00 PM. |
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Sun Feb 23 12:11:43 2025, Luke , Summary, Cleanroom, Cleanroom cleaning
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[Luke, Mary, Luis]
Particle Count Measurements:
Pre-cleaning (8:40 am):
Zone 3:
0.3 µm: 441
0.5 µm: 44
1.0 |
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Fri May 9 20:06:27 2025, Luke , Summary, Cleanroom, Cleanroom cleaning
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[Luke, Mohak, Luis]
We were also able to remove the residue that has built up on the soft walls by donning a skinny bunny suit and with two wipes rubbing both sides
of the soft walls at the same time. The wipes would get gummy very quickly and need to be replaced frequently. |
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Wed May 21 14:40:38 2025, Xuesi Ma, Infrastructure, Cleanroom, Cleanroom Temperature
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Date and Time: Around 2:20 PM on May 21, 2025
Location and Temperature:
Back of the room, around the working station: 85.5 °F
Front of the room, around the doorway: 82.3 °F
|
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Wed Jun 25 15:44:47 2025, Luke , Update, Cleanroom, Cleanroom cleaning
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[Luke, Luis, Tyler, Ma, Christina, Maple]
We started by cleaning outside of the cleanroom wiping down the cable channel and working our way down. We replaced the air filter in the HEPA
filter with what seemed to be the last one in storage. We then vacuumed outside, before wiping down the inside of the cleanroom. We then vacuumed, mopped, |
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Mon Jul 14 20:45:20 2025, Luke , Summary, Cleanroom, HEPA filter performance metrics
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[Luke, Luis]
We’ve been looking into methods for evaluating the performance of the HEPA filters in the clean room. Measuring flow rate appears to be
a promising approach, since the filter manual specifies a recommended minimum of 70 ft/min. |
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Thu Mar 5 12:08:47 2026, Pooyan, Infrastructure, Cleanroom, Cleanroom HEPA fan defect
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[Pooyan, Ma, Mary, Tyler]
While re-installing the clean-room HEPA fan filters, we realized that one of the blowers is broken. The issue seems to be that the plastic damper
bracket that is keeping the blower in place has failed. The fix is to open up the fan unit, and replace the broken vibration damper. We installed the |
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Wed Mar 11 19:38:21 2026, Pooyan, Infrastructure, Cleanroom, Parts and things to get after the cleanroom move 8x
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concrete Caulk to fill the drill holes in 1119
Example [Pooyan:
I have a caulk gun and silicon caulk at home, if needed.]
Water hose for the washer in 1125
1/2" diameter
almost
8 Ft
Exhaust for the oven in 1125
Question: not sure which way we want the exhaust to go. Measurements depend |
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Sun Apr 19 15:22:08 2026, Pooyan, Infrastructure, Cleanroom, HEPA fan air flow measurment
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[Ma, Mary, Tyler, Pooyan]
HEPA fan air flow measurements are done with the fans sitting on their side in the lab, and the anemometer being 24in away from the filter face
of the fan. Per company's documents, we need to replace the filter if the air flow velocity drops under 38-45 fpm for the medium settings.) |
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Sun May 3 21:13:14 2026, Pooyan, Infrastructure, Cleanroom, Cleanroom HEPA fan install
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[Ma, Cece, Pooyan, Tyler]
We installed the repaired HEPA fans on top of the cleanroom, and cleaned the fans themselves. The table of all the Serial Numbers for the fans,
filters, and where they are installed is added for the record. |