 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. |
Fri Feb 23 18:03:27 2024, Tyler, Update, FLIR, Optical Test Setup in Cleanroom 
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[Tyler, Xuesi]
The FLIR and test mass stand-in have been transferred into the cleanroom. A software test will be run as soon as we get an ethernet
cable long enough to reach into the cleanroom where the camera is set up. Once this is finished, the FLIR will be moved aside for construction of the FROSTI!
When completed, the camera will be placed back into position for in-air optical testing.
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Fri Feb 23 15:01:48 2024, Shane, Update, CDS, Latest draft of MEDM screen for FROSTI readouts
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Here's the latest draft of the MEDM screen for the FrOSTI temp and power readouts. Also, debugged the text readout boxes so they're now correctly reading
out the live temperature and power values. |
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Thu Feb 22 21:48:16 2024, Jon, Update, VAC, Vacuum vent for RGA testing of reflector
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[Jon, Tyler, Luke, Aiden]
Summary
Following Wednesday's cleanroom cleaning [333],
we proceeded to vent the vacuum chamber, remove the heater elements and their mount structure, and install the FROSTI reflectors. The reflectors are the
final components to undergo RGA testing before the FROSTI prototype can be assembled. After installing the reflectors, we pumped the chamber |
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Wed Feb 21 23:15:07 2024, Michael, Update, Interferometer Simulations, Long Shoelaces 1 Layout Created in Gtrace and Fixed Ghosting in Beamsplitter
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I have created the long shoelaces 1 layout for cosmic explorer using gtrace, a slight modification from the shoelaces 1 layout design. I also modified the
simulation code slightly to remove ghosting effects in the beamsplitter. Originally the python code specified that the HR and AR sides of the beamsplitter
both have the same transmission/reflection. I modified this to the ideal case of: Refl_AR = 0, Trans_AR = 1. I have attached two images below to show the |
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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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Tue Feb 20 18:08:24 2024, Aiden, Update, General, Degassing the RGA
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I took an RGA measurement before and after degassing the RGA. Both data was taken with the Argon open. The pressure before taking data was 2.39 e-8 torr
in the main volume. Note that the main chamber was fully valved off for the degas and the main chamber pressure quickly rose to e-6 torr. Further investigation
of this rise should be done as this might be the main culprit for the leaking. |
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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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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" |
 Tue Feb 20 08:01:30 2024, Jon, Infrastructure, General, Power and network equipment installed in 1129 rack
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[Jon, Tyler, Pooyan, Luis, Luke, Peter]
On Thursday we installed the power conditioning/distribution equipment and networking equipment in the new 1129
rack. The hardware is identical to the setup in the 1119 rack and includes:
Tripp Lite SU5KRT3UTF - 208V, 5kVA on-line UPS with 120V transformer
CyberPower PDU20M2F12R - metered power distribution unit, |
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Mon Feb 19 14:40:21 2024, Shane, Update, CDS, MEDM screen for FROSTI temp readouts
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Here's the latest draft of the MEDM screen for the FROSTI heating elements' temperature readouts. Note that the MEDM screen isn't actually this grainy,
this just happens to be a photo of the lab monitor's screen off a phone. |
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Mon Feb 19 14:17:50 2024, Aiden, Update, VAC, Heater Element RGA Scan
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Three days after the completion of Bake 11, the Heater elements RGA scan looks much cleaner. The HC level is back down to 33 e-10 torrl/s with the pressure
at 2.13 e-8 torr. I could not take a= scan with the Argon closed as it was left open during the bake and not closed since then. |
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Fri Feb 16 18:37:28 2024, Jon, Update, VAC, Bake ended 6:23 pm
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I ended the bake of the UHV system (that began on Monday) at 6:23 pm today by switching OFF both PID controllers. The heaters elements were run at max
power (24 V DC / 200 mA per element) during this bake, and I left them powered at the same level.
At the time, the instrument readings were as follows: |
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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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Tue Feb 13 12:34:04 2024, Aiden, Update, VAC, VAC Heating System Update
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| Here is an overlay with for all the heating steps done with the heater elements. |
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Tue Feb 13 12:26:23 2024, Tyler, Update, Interferometer Simulations, BS Code Update
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I reproduced Cao's CE beamsplitter code (see below for example plots). I received the current info on the beamsplitter parameters for A+ and A# from
GariLynn also. The next steps are to perform a similar power loss analysis on the anticipated A# beamsplitter. |
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Tue Feb 13 11:54:45 2024, Tyler, Configuration, FLIR, In-Air Optical Test Configuration
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Below is the proposed schematic for FROSTI optical testing, chosen so enough space is allotted for prototype assembly.
Steps to be taken include:
Reconstruct FLIR staging apparatus
Move test mass stand-in to cleanroom
Mark FLIR camera position on cleanroom |
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Tue Feb 13 04:05:32 2024, Michael, Update, Interferometer Simulations, Shoelaces 1 Layout Simulated in GTrace
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I've worked on and have completed a first simulation of Cosmic Explorer's Shoelaces 1 layout. This is based off of Pooyan's original work with Gtrace much
like the Long Crab 1 layout I worked on last week. This layout will allow me to quickly created the alternate shoelaces layouts. I've included an image
of the dxf, and a desmos model for reference. |
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Tue Feb 13 01:26:30 2024, Peter, Update, Interferometer Simulations, CARM Power Simulations
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Cao's simulations of the circulating power and gouy phase through a single arm cavity of the interferometer have been reproduced. Images of the plots can
be shown in the pdfs attached. There are approx. 400 lines in this code (scenario_3_carm) that produces these plots. This code also calls on a separate
code source file (thermal_models) that defines many of the functions used in this main simulation. The thermal_models file consists of over 1000 lines. |
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Mon Feb 12 17:35:47 2024, Aiden, Update, VAC, Heater Element RGA Scan
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Took more RGA data before and after increasing the heater elements to 300 degC and before heating them up.
Started Bake 11 as well to hopefully prevent any hydrocarbons from getting captured by the room temperature walls of the chamber. The PID controllers
were set to 100C. |
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Thu Feb 8 17:37:48 2024, Aiden, Update, VAC, Heater Element RGA Scan
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Took more RGA data now that the heaters are powered by 18V. The pressure of the system during the data taking was 3.8 e-8 torr. The RGA scans seem to have
gotten worse as well with this power increase. |
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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 6 22:40:25 2024, Michael, Update, Scripts/Programs, Long Crab 1 Design Created In Gtrace
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Worked on and completed the python code for the simulation of the Long Crab 1 layout for Cosmic Explorer basing off of Pooyan's original work with the Crab
1 layout. From here I'll look into creating the shoelaces layouts. |
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Mon Feb 5 14:17:52 2024, Aiden, Update, VAC, Heater Element RGA Scan
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Here are the new RGA scans for the powered Heater elements. The pressure at the time of taking data was 2.88 e-8 torr. The HC levels are at 40 e-10 torrl/s
which is not bad but still higher than the lowest we have recorded. |
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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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Fri Feb 2 19:08:20 2024, Aiden, Update, VAC, 1st Hot Element RGA Scan
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| Here are the measurements for the RGA scan of the elements while on at around 160C. The pressure of the chamber during the test was 4.12 e-8 torr. |
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Fri Feb 2 16:56:56 2024, Jon, Update, CDS, RTS model implemented for FROSTI RTD readouts
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Summary
Today I finished implementing an RTS model to read out the integrated FROSTI RTDs (temperature sensors) via the CyMAC. The model is
named "MSC" and is located at cymac:/opt/rtcds/usercode/models/c1msc.mdl. We successfully tested it with the heater elements operating in vacuum at low
power (12 VDC), finding them to reach an average steady-state temperature of 160 C. |
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Wed Jan 31 14:37:26 2024, Shane, Summary, CDS, path directions for CyMAC model and parts library
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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 |
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Tue Jan 23 12:17:41 2024, Tyler, Update, Electronics, RTD Chassis
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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:
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Tue Jan 30 11:36:19 2024, Tyler, Update, Electronics, RTD Chassis
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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 |
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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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Thu Jan 18 15:13:37 2024, Aiden, Update, VAC, VAC Heating System Update
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[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. |
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Tue Jan 16 16:11:41 2024, Aiden, Update, VAC,
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[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 |
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Mon Nov 20 10:10:50 2023, Tyler, Configuration, Electronics, RTD Logic/Schematic Diagrams
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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. |
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Fri Dec 29 16:02:27 2023, Jon, Configuration, Electronics, RTD Readout Chassis
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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. |
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Tue Jan 9 12:08:59 2024, Tyler, Configuration, Electronics, RTD Readout Chassis Update
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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 |
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Tue Jan 16 12:20:21 2024, Tyler, Configuration, Electronics, RTD Readout Chassis Update 2
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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 |
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Tue Jan 16 10:01:21 2024, Peter, Update, VLC Update, VLC Faraday Isolator and Mode Matching
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| Attached is a PDF of my weekly updates. |
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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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Tue Jan 9 16:35:09 2024, Aiden, Update, VAC, VAC System Leak and Heating
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[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 |
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Mon Jan 8 20:24:53 2024, Aiden, Update, General,
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[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 |
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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 |
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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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Tue Dec 19 15:45:05 2023, Aiden, Update, VAC, Vacuum Chamber Baking Update
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| 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. |
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Mon Dec 18 15:51:49 2023, Aiden, Update, VAC, VAC System Heating Update
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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. |
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Sun Dec 17 19:43:18 2023, Aiden, Update, VAC, Vac Heating Update
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[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. |
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Fri Dec 15 14:03:02 2023, Aiden, HowTo, VAC, Vacuum Chamber Opening
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[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 |
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Mon Dec 11 16:20:17 2023, Jon, Summary, TCS, FROSTI Assembly Procedure
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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, |
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Mon Dec 11 12:58:57 2023, Shane, Luis, Update, CDS, DAC-ADC loopback test debugging
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[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. |
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Thu Nov 30 13:50:32 2023, Tyler, Update, Lore, Workbench Assembly Completed
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[Tyler, Luke, Aiden]
The workbenches are now completely assembled and put into their final places. Additionally, the tool chest has been moved.
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Sat Dec 9 12:34:12 2023, Jon, Update, General, Electronics workshop migrated to 1129
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[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 |
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Fri Dec 8 11:15:21 2023, Peter, Update, VLC Update, VLC Assembly
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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 |
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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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Thu Dec 7 12:42:42 2023, Aiden, Update, VAC, Vacuum Chamber Baking Update
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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. |
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Mon Dec 4 21:27:53 2023, Shane, Update, CDS, ADC-DAC loopback test results
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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 |
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Mon Dec 4 11:19:50 2023, Aiden, Update, VAC, Vacuum Chamber Baking Update
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[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. |
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Sat Dec 2 18:10:23 2023, Aiden, Update, VAC, VAC System Heating Update
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[Aiden]
Turned off the heating tape today in anticipation to take more RGA data on Sunday or Monday morning before the meeting. |