 Thu May 15 12:03:41 2025, Xuesi Ma, Infrastructure, Electronics, Notice
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All Sorensen power supplies are turned off. The Cymac system is down (All Chassis are down)
If you need more information or if you need to turn them back on please contact Xuesi Ma. |
Tue Jun 17 12:46:47 2025, Tyler, Update, Electronics, CyMAC ADC Noise 
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Below are results from power spectra measurements of the CyMAC ADC, computed form 30 hours of time series data, compared to the performance of the Red Pitaya.
The frequency resolution for the initial Cymac CSD is 2 Hz, and 216,000 spectra measurements are averaged together. As of now, it still looks like we haven't
reached the correlated noise floor of the CyMAC. We have a few days worth of data to take from, so I'll look into using a longer period of time. |
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Mon Nov 28 18:10:23 2022, shane, Update, ELOG, Particle counts in the clean room
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Particle count stats for the clean room Nov 28, 2022:
Took 10 sample runs in each of 5 regions in the clean room (5 runs per region with a person inside
the clean room for the measurement, and 5 runs per region without anyone in the clean room for the measurement), for a total of 50 samples taken. Sample
time was 60 seconds. Overall clean room average particle count for the size ranges are as follows:
0.3 micrometers- 3405.76 (room occupied), 974.92 (room |
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Wed Jan 18 22:06:05 2023, Julian, Update, ELOG, Cleanroom Update
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| I wiped down all the inner walls of the cleanroom using alcohol wipes, as per Cao's instruction. |
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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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Tue Oct 15 15:27:38 2024, Xuesi Ma, Update, ELOG, Timing Chassis Update 12x
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I conducted separate tests on the '5015' and '3010a'. When powered individually, the '5015' outputs a signal at 33.55 MHz with an amplitude of 608
mV. It draws 1 A of current from the power source. The input signal for the '3010a' is 33.54 MHz with an amplitude of 670 mV (peak-to-peak) and a 15 mV
DC offset. The output signal from channel 1 is a 65.5 kHz square wave with an amplitude of 3.28 V. The '3010a' draws 0.1 A of current.
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Tue Mar 4 03:05:42 2025, Xuesi Ma, Update, ELOG, LOG
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1424564097.243212 2025/02/26 00:14:39 UTC Time start
12V 2A right after start all 8 elements
1424564478.079428 2025/02/26 00:21:00 UTC Time stop |
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Thu Nov 6 12:39:43 2025, Cece Ochoa, Update, ELOG, CE Cavity Design Update
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| Updated mode placements and ROC. No thermal effects added yet. |
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Thu Nov 20 13:03:58 2025, Cece Ochoa, Update, ELOG, CE Cavity Design Update
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| Update on grouping 0+8th Order Modes |
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Thu Feb 12 12:53:51 2026, Cece Ochoa, Update, ELOG, CE Cavity Design Update
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Update on HOM placement w/ cavity locking. Still verifying mode placement
RoC: 28340m and 26874m |
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Mon Jul 3 16:26:21 2023, Cao, Infrastructure, DAQ, Access and control Red Pitaya remotely and run it on local machine
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[Cao]
To access and control the Red Pitaya using Python locally on a machine within the local network, one should follow these steps:
Start the SCPI server. This is achieved by first log onto the Red Piatay page
rp-xxxxxx.local/
Go to Development >> SCPI server and turn the server on. (Note : The server is currently running)
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Thu Mar 21 16:56:42 2024, Tyler, Update, DAQ, RTD Parameter Calibration
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[Jon,Tyler]
We noticed that the RTD temperature readings given on the Cymac were off, and traced the issue to miscalibration in the relationship
between the resistance and temperature of each RTD (Callendar-Van Dusen eqn). Below is the table of values inferred from independent measurements of temperature
and resistance to rectify this problem. This data was then fitted to better determine the coefficients present in the temperature-resistance relation: |
 Mon Mar 25 10:55:33 2024, Tyler, Update, DAQ, RTD Parameter Calibration
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Refitted RTD calibration, neglecting quadratic term:
R_0 (ohm) Alpha (1/C)
RTD 0 79.3962 0.002031
RTD 1 78.2874 0.002530 |
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Tue Mar 26 13:51:56 2024, Tyler, Update, DAQ, RTD Parameter Calibration
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Another re-fit, but this time the quadratic coefficient (beta) is set to 1.003e-6:
R_0 (ohm) Alpha
(1/C)
RTD 0 79.7386 0.001863 |
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Mon Jul 29 13:39:16 2024, Tyler, Update, DAQ, RTD Parameter Calibration
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[Tyler]
Using the data taken during the FROSTI testing at Caltech, I attempted to find a better calibration of the RTD sensors, given our past issues
with inaccurate readings. The fit parameters, alpha and beta, are still all different from the initial values given to us by Fralock (alpha = .003, beta
= 1.003e-6, R_0 was not given), but the true values will differ based on factors such as part geometry.
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Wed Dec 14 17:35:41 2022, Jon, Infrastructure, Computers, Windows Laptop
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I set up the new Windows 10 laptop (pictured below), which arrived yesterday. This laptop is intended to be used for running lightweight Windows-only
programs, such as the Thorlabs beam profiler software or the SRS RGA client. However, none of that software is installed yet.
Configuration details
As usual, the computer is configured with one shared account (username: controls) and the standard password. Note |
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Tue Feb 7 17:44:17 2023, Jon, Infrastructure, Computers, Workstation 1 (ws1) set up
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The Linux workstation (ws1) that used to sit on the old workbench has been mounted on the new electronics bench and is now ready for use again. I upgraded
the OS to Debian 11.6 and also upgraded the CDS workstation tools. |
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Wed Mar 1 21:50:46 2023, Jon, Infrastructure, Computers, Workstation 2 (ws2) mounted on cleanroom cart
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The Linux workstation (ws2) that used to sit on the blue workbench (now inside the cleanroom) has been mounted on a mobile cart, as pictured below. This
is intended to be a clean cart that will be housed inside the cleanroom.
The cart is currently dirty and will need to be throughly wiped down (along with the computer monitor and peripherals) prior to being moved into |
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Fri Mar 24 07:14:38 2023, Jon, Infrastructure, Computers, Workstation 2 (ws2) mounted on cleanroom cart
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The ws2 cart has been thoroughly wiped down with IPA wipes and moved inside the cleanroom. I have reconnected it to power and Ethernet (cables bundled and
ran to the server rack just outside the cleanroom). It is ready for use.
Quote:
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Sun May 14 15:50:48 2023, Cao, Infrastructure, Computers, High resolution display of logrus machine
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[Cao]
The display resolution of the logrus has been 1064x768 and has been the only option, which is not great. While remote access to logrus using
rdesktop allows rendering a virtual display of user's chosen resolution, it is not fast when using graphic-intensive program. NoMachine allows user to
take over and control the machine remotely and thus appears as the same machine. However, NoMachine cannot render a virtual display like rdesktop. This |
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Sat Feb 24 08:53:38 2024, Jon, Infrastructure, Computers, Matlab upgraded to 2023b on Chimay
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| I upgraded Matlab on chimay to the latest stable release, 2023b. From some quick tests, it appears to be in working order. Let me know of any issues. |
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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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Thu Jun 20 18:01:11 2024, Jon, Infrastructure, Computers, New workstation ws3 in 1129
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I have repurposed a spare Intel NUC to serve as the first of two planned workstations in 1129. Today I set it up with a fresh installation of Debian 12.5,
assigned it the static IP address 192.168.1.15, and installed the LIGO CDS workstation packages. It is assigned the host name ws3.
Temporarily, the
mouse is borrowed from ws1 in 1119. We need to order another mouse as well as a 25-ft Ethernet cable for connecting the workstation to the 1129 switch, |
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Mon Jun 24 21:38:25 2024, Pooyan, Infrastructure, Computers, Computer server changes in 1119 and 1129
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[Jon, Pooyan, Tyler]
A few computer machine changes have been made. |
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Wed Jun 26 15:33:41 2024, Jon, Infrastructure, Computers, New workstation ws3 in 1129
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Set-up of the first CDS workstation for 1129, ws3, is complete and the machine is ready for use. The login credentials are the same as the other lab
machines.
All that now remains is to install a permanent cable tray for running the new Ethernet cables between the electronics rack and bench (they are |
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Mon Jul 15 14:49:06 2024, Pooyan, Update, Computers, Synology NAS server setup
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Installed a Synology NAS server (Synology RackStation RS1221) in lab room 1129, with host name “scribe” and ip “192.168.1.17”. It is mounted on the rack
and each of its 8 storage bays has a 2TB SSD disk. It will be used to set up automated backups of all the lab machines (e.g., chimay, logrus, megatron).
One shared storage is set on it with SHR-2 as its RAID type. It can tolerate the failure of two disks and has 10.4TB of total capacity. |
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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. |