ID |
Date |
Author |
Type |
Category |
Subject |
542
|
Tue Mar 25 12:56:47 2025 |
Tyler | Update | TCS | FROSTI Analysis Finalization |
Upon final review of the FROSTI analysis included in the (hopefully) soon-to-be submitted instrument paper, I've made some adjustments to the reflectivity analysis that estimates the amount of power delivered to the test mass by the FROSTI. Initially, as detailed in elog 447, the delivered power was approximated to be 12.6 W (later adjusted to 12.9 W), with roughly 18% of this power being reflected by the test mass. After some final adjustments, this value now is closer to 12.0 W, with 10.2 W absorbed (15% power reflection). Below is a table showing the updated values for the FROSTI prototype tests:
|
Old Value |
New Value |
Delivered Power |
12.9 W |
12.0 W |
Absorbed Power |
10.6 W (18% reflectivity) |
10.2 W (15% reflectivity) |
Measured Peak Temperature Difference |
5.39 +/- 0.03 K |
5.26 +/- 0.03 K |
Model Peak Temperature Difference |
5.42 K |
5.21 K |
Measured Peak OPD |
765 +/- 9 nm |
771 +/- 7 nm |
Model Peak OPD |
630 nm |
654 nm |
|
Attachment 1: FROSTI_OPD_profile.pdf
|
|
Attachment 2: FROSTI_temperature_profile.pdf
|
|
541
|
Sun Mar 23 15:39:06 2025 |
Luke Johnson | Update | Scripts/Programs | Ringheater Location optimization |
Attached are some plots that show a new parameter sweep with a finer mesh then before. I have also been able to get a heatmap of power of HOMs in a very simple finesse model. |
Attachment 1: _4-4.png
|
|
Attachment 2: _40.png
|
|
Attachment 3: 02.png
|
|
Attachment 4: HOM_power.svg
|
|
540
|
Tue Mar 11 11:28:52 2025 |
Cynthia | Update | Interferometer Simulations | flattening mirror to study power discrepency |
|
Attachment 1: updates_3_11_(1).pdf
|
|
539
|
Tue Mar 11 10:43:57 2025 |
Xuesi Ma | Update | | |
Continue investigation in the spikes
Pulsed ADC with a function generator and find no spikes. Rules out ADC for causing the spikes
Loopback test that bypasses the FROSTI Chassis shows spikes (spikes happened on all channels at the same time)
Next step is to bypass the AI Chassis to find the source of the spikes |
Attachment 1: 20250310_171936.jpg
|
|
537
|
Mon Mar 10 21:32:29 2025 |
Nathan | Physics | Electronics | Beam Profiling and PBS Measurements |
Beam wasn't diverging, however maybe was about to diverge when measurements stopped? Will discuss the PBS measurements and how the voltage changed due to the wave plate. |
Attachment 1: Beam_Profiling_2_20_(2).pdf
|
|
Attachment 2: beamprfl.png
|
|
Attachment 3: thumbnail_(6).jfif
|
536
|
Mon Mar 10 21:13:12 2025 |
Nathan | Update | VLC Update | PDH Lock Progress and Next Steps |
Photodiode is set up, need to set up DC bias tee, and discuss about power supply |
Attachment 1: thumbnail_(2).jfif
|
Attachment 2: thumbnail_(3).jfif
|
Attachment 3: thumbnail_(4).jfif
|
Attachment 4: thumbnail_(5).jfif
|
Attachment 5: Visible_Light_Optical_Cavity_(2).pdf
|
|
535
|
Mon Mar 10 17:03:52 2025 |
Shane | Update | CDS | Pressure Gauge successful connect |
Vac system serial interfacing update: the pressure gauge is now able to communicate successfully through the code. It's been set to a static ip of 192.168.1.30, on port 8000. |
534
|
Wed Mar 5 18:13:20 2025 |
Shane | Update | CDS | vac system comms |
[Shane, Jon]
Update on the serial interfacing with the Inficon VGC503 pressure gauge: We began setup of the Inficon pressure gauge today. We configured the ethernet setting via USB and assigned it a static IP address of 192.168.1.30, which is listed in the network table on the lab wiki. It is showing up on the network successfully, and is responding to pings. Will attempt communication via code next.
|
533
|
Wed Mar 5 12:16:28 2025 |
Shane | Update | CDS | Vac system communications update |
[Shane, Jon]
Update on the serial interfacing with the vacuum system: both turbo pumps are now able to successfully communicate through the code. The older pump, for unknown reasons, required a newer version of the communication syntax (despite the newer, small pump being able to communicate fine with the old communication format). We have also confirmed that the newer pump works with this new format as well. Next step is interfacing the pressure gauge.
|
532
|
Tue Mar 4 10:47:03 2025 |
Shane | Update | CDS | Vac system pinouts |
Attached here are the pinouts, as we currently know them, for the vacuum system. The three items focused on here are the Agilent TwissTorr 74 FS turbo pump (the smaller/newer pump) and controller, the Agilent TV 551 Navigator turbo pump (the larger/older pump) and controller, and the Eight-channel Perle IOLAN SDS8 terminal server. The 'field' pinouts in the attached tables refer to the DB9 end of the RJ45F to DB9F converter. |
Attachment 1: vac_pinouts_1.jpeg
|
|
Attachment 2: vac_pinouts_2.jpeg
|
|
531
|
Tue Mar 4 10:28:58 2025 |
Tyler | Update | TCS | RIN Plot Updates |
|
Attachment 1: Dark_bin_veto.pdf
|
|
Attachment 2: Mock_final_plot_inst.pdf
|
|
530
|
Tue Mar 4 10:18:43 2025 |
Cynthia | Update | Interferometer Simulations | attempted to remove curvature and tilt for the coating |
|
Attachment 1: 3_4_updates.pdf
|
|
529
|
Tue Mar 4 03:33:18 2025 |
Xuesi Ma | Update | | Update |
Spikes Appear Again, need to address it systematically.
Power on and off before reaching steady state ✔
At 12V, the rise and fall time of heater elements are different from 24V.
Initial guess is due to temperature in the chamber. However, it does not seem to be the case, 24V with 30c have the same hall time as 24V at lower temperature.
Attached are some graphs for rise and fall time
After a weekend of powering on, the main chamber pressure stabilized in the UHV region.
Temperature in the chamber seems also not to change. |
Attachment 1: resistance_vs_time_all_channels_all_time.pdf
|
|
Attachment 2: resistance_vs_time_rise_time.pdf
|
|
Attachment 3: resistance_vs_time_fall_time.pdf
|
|
Attachment 4: resistance_vs_time_rise_time_12V.pdf
|
|
Attachment 5: resistance_vs_time_fall_time_12V.pdf
|
|
Attachment 6: resistance_vs_time_fall_time_24V_30c.pdf
|
|
528
|
Tue Mar 4 03:05:42 2025 |
Xuesi Ma | Update | ELOG | LOG |
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
12V 1.8A right before stop all 8 elements
1424564832.211584 2025/02/26 00:26:54 UTC Time start
12V 1.9A right after start all 8 elements
1424565208.359935 2025/02/26 00:33:10 UTC Time stop
12V 1.8A right before stop all 8 elements
1424565573.565066 2025/02/26 00:39:15 UTC Time start
12V 1.8A right after start all 8 elements
1424565931.242394 2025/02/26 00:45:13 UTC Time stop
12V 1.7A right before stop all 8 elements
1424566292.67104 2025/02/26 00:51:14 UTC Time start
12V 1.8A right after start all 8 elements
1424566648.619952 2025/02/26 00:57:10 UTC Time stop
12V 1.7A right before stop all 8 elements
1424566996.312246 2025/02/26 01:02:58 UTC Time start
12V 1.8A right after start all 8 elements
1424567381.748943 2025/02/26 01:09:23 UTC Time stop
12V 1.7A right before stop all 8 elements
1424567756.528736 2025/02/26 01:15:38 UTC Time start
12V 1.7A right after start all 8 elements
0.2A right before start
spikes!?
1424643001.864687 2025/02/26 22:09:43 UTC
change c_0(VEXC0 & VCXC0) to 2V (why is it on 5V ?)
2025/02/26 22:18:51 UTC
Main chamber pressure:5.92e-9
RGA chamber pressure:1.98e-9
1424650528.240947 2025/02/27 00:15:10 UTC Time start (increase voltage)
24V 2.1A right after start all 8 elements
disconnect and reconnect (exc 1-4)(out 9-12) & (exc 5-8)(out 13-16)
2025/02/27 19:34:26 UTC
Main chamber pressure:1.34e-8
RGA chamber pressure:4.33e-9
Main chamber temp: 29
RGA chamber temp:29
2025/02/28 18:02:29 UTC
Main chamber pressure:1.05e-8
RGA chamber pressure:3.53e-9
Main chamber temp: 29
RGA chamber temp:30
1424801097.374902 2025/02/28 18:04:39 UTC Time stop
24V 1.8A right before stop all 8 elements
0.1A right after stop
1424827460.71372 2025/03/01 01:24:02 UTC Time start
24V 2.9A right after start all 8 elements
0.1A right before start
2025/03/01 01:25:34 UTC
Main chamber pressure:5.98e-9
RGA chamber pressure:2.06e-9
Main chamber temp:27
RGA chamber temp:27
2025/03/03 20:28:03 UTC
Main chamber pressure:7.8e-9
RGA chamber pressure:2.64e-9
Main chamber temp:27
RGA chamber temp:27 |
527
|
Thu Feb 27 18:22:21 2025 |
Shane | Update | CDS | Ongoing work in server rack and desk area (1119) |
As part of the vacuum communications debugging process, there is ongoing work in the server rack and desk area in 1119. Please be careful not to move any of the materials left out in the server rack or on the work bench. |
526
|
Tue Feb 25 10:56:25 2025 |
Cynthia | Update | Interferometer Simulations | mirror coating added for simulation rerun |
I have tried to rerun the simulation on finesse after adding the mirror coating. The result has a large fluctuation in required input power vs arm power that is concerning. I am currently working on potentially resolve this issue and get a reasonable graph before I proceed to optimizing the thermal maps. |
Attachment 1: updats_(3).pdf
|
|
525
|
Tue Feb 25 10:02:32 2025 |
Xuesi Ma | Update | | |
1424039912.625576 2025/02/19 22:38:14 UTC Time start
24V 2.8A right after start all 8 elements
1424044804.902443 2025/02/19 23:59:46 UTC Time stop
24V 1.8A right before stop all 8 elements
0.1A right before start and right after stop
note: turned on briefly to check current right before stop
2/20 RGA Scan
spikes??
1424129207.857777 2025/02/20 23:26:29 UTC Time start
24V 2.9A right after start all 8 elements
1424140789.856096 2025/02/21 02:39:31 UTC Time stop
24V 1.7A right before stop all 8 elements
0.1A right before start and right after stop
2025/02/21 02:43:19 UTC
Main chamber pressure: 1.54e-8
RGA chamber pressure:5.06e-9
spikes are due to loose connection between connectors.
1424210410.173863 2025/02/21 21:59:52 UTC Time start
24V 2.9A right after start all 8 elements
1424218357.96404 2025/02/22 00:12:19 UTC Time stop
24V 1.7A right before stop all 8 elements
each elements: 0.3A (0.2A increment)(all)
0.1A right before start and right before stop
2/24 RGA Scan
1424467918.129082 2025/02/24 21:31:40 UTC Time start
12V 2A right after start all 8 elements
1424478936.635821 2025/02/25 00:35:18 UTC Time stop
12V 1.6A right before stop all 8 elements
each elements: 0.4A (0.2A increment)(all)
0.2A right before start
rise time: A(1-exp(-t/tau))+B
fall time: Aexp(-t/tau) +B |
Attachment 1: resistance_vs_time_all_channels_all_time.pdf
|
|
Attachment 2: temperature_vs_time_all_channels_all_time.pdf
|
|
Attachment 3: resistance_vs_time_rise_time.pdf
|
|
Attachment 4: resistance_vs_time_fall_time.pdf
|
|
523
|
Tue Feb 25 01:37:00 2025 |
Michael | Update | Interferometer Simulations | Updates and Current Next Steps for Toroidal Mirrors Project |
Since the previous discussion of this project, I've worked on building finesse models to verify mathematical results which model the astigmatism in a two mirror system which we attempt to minimize. This left us with a single condition for an output non-astigmatic beam. However, as can be seen in finesse simulations, there does exist other configurations which have a negligibly small astigmatism, which we may want to consider. Below I've attached the link to my overleaf project which has some updated information which I plan on discussing.
https://www.overleaf.com/project/67968921426e61d5b2fd8c96 |
522
|
Mon Feb 24 17:50:13 2025 |
Luis | Update | VAC | RGA Scan |
[Ma, Luis]
February 24, 2025 - 1:00PM
Ma performed an RGA scan with the vacuum system containing the heater elements. The results are attached below.
|
Pressure (Torr) |
Temperature (°C) |
RGA Volume |
3.31 × 10⁻⁹ |
25 |
Main Volume |
5.75 × 10⁻⁹ |
24 |
|
Attachment 1: 2025-2-24_HeaterElement_ArO.png
|
|
521
|
Sun Feb 23 16:00:07 2025 |
Luke | Update | Scripts/Programs | Ringheater modeling Update |
These are some plots:
The first shows the convergence of the 02 mode reducing the size of the mesh. The second shows the the numerical error of the zernike.
The first is found by sweeping a parameter that changes the size of the mesh. The HR surface was set to half a cm for all values.
The second by taking the inner product of a zernike mode with its self and calculating its deviation from pi for varying fineness of the mesh. |
Attachment 1: mesh_convergence.png
|
|
Attachment 2: numerical_error_in_innerproduct_of_zernike_basis_elemets.png
|
|
520
|
Sun Feb 23 12:11:43 2025 |
Luke | Summary | Cleanroom | Cleanroom cleaning |
[Luke, Mary, Luis]
Particle Count Measurements:
- Pre-cleaning (8:40 am):
- Zone 3:
- 0.3 µm: 441
- 0.5 µm: 44
- 1.0 µm: 0
- Zone 4:
- 0.3 µm: 353
- 0.5 µm: 176
- 1.0 µm: 44
- Started Cleaning (3:16 pm)
- Finished Cleaning (4:10 pm)
- Post-cleaning (4:15 pm):
- Zone 3:
- 0.3 µm: 574
- 0.5 µm: 265
- 1.0 µm: 132
- Zone 4:
- 0.3 µm: 177
- 0.5 µm: 44
- 1.0 µm: 0
|
Attachment 1: partical_count_2-21-25.png
|
|
519
|
Thu Feb 20 17:07:36 2025 |
Luis | Update | VAC | RGA Scan |
[Ma, Luis]
February 20, 2025 - 3:30 PM
Ma performed an RGA scan with the vacuum system containing the heater elements. The results are attached below.
|
Pressure (Torr) |
Temperature (°C) |
RGA Volume |
1.87× 10⁻⁹ |
23 |
Main Volume |
5.70 × 10⁻⁹ |
23 |
As we can see, we are not yet under cleanliness standards. The passing threshold is 4 × 10⁻¹⁰, we are very close to it.
|
Attachment 1: 2025-2-20_HeaterElement_ArO.png
|
|
518
|
Wed Feb 19 13:44:48 2025 |
Shane | Update | CDS | Vac serial interfacing update |
[Jon, Shane]
Debugging update for vac system serial communications: we were able to successfully connect the smaller turbo pump to the Varian (manufacturer) software today by plugging the controller db9 directly into spica, and verified that the pump was able to send and receive information. Still no success on communication with the larger pump via python serial code, though. Issue potentially lies in the pinout mapping of the connectors, as the pinouts we'd been using work successfully for the small pump which only requires 3 connections (RXD, TXD, GND), but the large pump may require more. Tried to test this on the big pump by keeping the pinout setup for the small pump, and incrementally adding the remaining 6 connections on a one to one scale (Pin 1 matched to Pin 1, etc) between the controller DB9 and the field DB9 connected to the IOLAN ethernet cable. After each new connection was added, I retried running the serial connection code. None of the additional connections yielded any results, and the large pump remained unable to connect through the code. Next step is further looking into documentation on the pinouts to see if the large pump requires a different connection setup than the small pump.
|
517
|
Tue Feb 18 11:19:13 2025 |
Luke | Configuration | VAC | Repositioning of the lid's temperature probe |
Before the recent bake I slightly repositioned the temperature probe on the lid from beside the heater tape to under the heater tape. This was done to better know and control the temperatures of the chamber while baking. It has appeared to work with the temperatures being held very close to the 120C target. |
516
|
Tue Feb 18 10:12:39 2025 |
Tyler | Update | TCS | Final RIN Plot Update |
Below is a preview of the final RIN figure that will be included in the FROSTI instrument paper. A quick summary of what is shown below:
The original RIN CSD measurement is shown on the top panel in red. Frequency bins that exhibit external electronics noise (ex. ADC, photodetector noise, etc.) are identified and shaded in gray. These noisy bins are then excluded from the dataset before beginning the next step in the analysis process: rebinning. Here, the resolution of the spectrum can be changed by averaging frequency bins together within a specified interval, with the goal of pushing the measurement curve closer to the A+ requirement shown in the figure. For demonstration below, the spectrum goes from a resolution of ~0.93 Hz to 14.90 Hz.
|
Attachment 1: Preliminary_RIN_plot.pdf
|
|
Attachment 2: FROSTI_ON.pdf
|
|
Attachment 3: Dark_Noise.pdf
|
|
Attachment 4: ADC_Noise.pdf
|
|
515
|
Tue Feb 18 10:02:16 2025 |
Xuesi Ma | Update | | Group Meeting Slides 2/18/2025 |
https://docs.google.com/presentation/d/1WiV2VqS0BzXNCK6VYYQ-Ty8xlHnzXatQaFbMf1-0rsY/edit?usp=sharing |
514
|
Tue Feb 18 10:01:07 2025 |
Xuesi Ma | Update | | |
[Ma, Pooyan, Tyler]
On Friday, we connected the vacuum chamber with the Cymac. |
Attachment 1: IMG_7916.jpeg
|
|
Attachment 2: IMG_7915.jpeg
|
|
Attachment 3: IMG_7917.jpeg
|
|
513
|
Sun Feb 16 16:45:18 2025 |
Luke | Update | General | Ringheater position optimization |
Over the last couple weeks I have been working on finding the optimal position of the ringheater's thermal profile.
Today I would like to give an update of where I am at and my next steps.
Using the python COMSOL interface I have been able to run and save deformation data sweeping through a great deal of potential combinations of widths and positions.
I then calculated their zernike coefficients and using a very simple "quality" function (02 - (40)*10 - (4-4)*10), where 02 stands for the zernike mode of quadratic deformation, I was able to generate a heat map of comparing the "quality" verses the width and position used.
Seen below are four plots. The first is simply the 02 coefficient of the decomposition followed by the negative of 40 and 4-4 then the "quality."
This 'quality' function was an arbitrary choice on my part. I believe that my next step would either be defining a more useful function or using finesse to model the actual effects of this surface deformation. |
Attachment 1: 02.png
|
|
Attachment 2: _40.png
|
|
Attachment 3: _4-4.png
|
|
Attachment 4: 02_40_4-4.png
|
|
512
|
Fri Feb 14 12:15:23 2025 |
Luis | Update | VAC | Vacuum sytem staus |
[Luis, Luke, Ma]
February 12, 2025 - 4:00 PM
We performed an RGA scan with the vacuum system containing the heater elements. The results are attached below.
|
Pressure (Torr) |
Temperature (°C) |
RGA Volume |
3.13 × 10⁻⁹ |
23 |
Main Volume |
6.15 × 10⁻⁹ |
23 |
As we can see, we are not yet under cleanliness standards. The passing threshold is 4 × 10⁻¹⁰, and we are currently measuring nearly double this value. We will continue performing scans to monitor any changes in these readings.
|
Attachment 1: 2025-2-12_HeaterElement-Bake1_ArC.png
|
|
Attachment 2: 2025-2-12_HeaterElement-Bake1_ArO.png
|
|
511
|
Fri Feb 14 11:57:50 2025 |
Luis | Update | VAC | Vacuum Update |
[Luis]
Feb/11/25 9:30am
Pressure gages were connected.
|
510
|
Tue Feb 11 08:07:02 2025 |
Luis | Update | VAC | Bake stopped |
[Luis, Ma]
Feb/10/25 4:00pm
Bake was stopped.
|
509
|
Fri Feb 7 12:25:56 2025 |
Luke | Summary | VAC | Started bake |
[Luke, Luis]
The vacuum chamber is currently baking.
We stepped up to 120°C by increments of 30°C starting at 60°C. We took about an hour break at 90°C to let the temperatures equilibrate.
Current state as of 12:20:
The gate valve is open, the calibrated Argon leak is open, and the filament of the RGA is on.
The temperatures are as follows:
PID right barrel upper: 113°C, RGA volume: 120°C
PID left barrel lower: 121°C, Lid: 114°C
The lower temperatures should climb as the whole system heats up.
|
508
|
Mon Feb 3 13:17:21 2025 |
Xuesi Ma | Update | | |
[Ma]
changed all zip ties to peek zip ties, and grouped wires together. The setup is ready to go into the chamber. |
Attachment 1: 20250203_123153.jpg
|
|
Attachment 2: 20250203_123213.jpg
|
|
507
|
Sat Feb 1 17:25:52 2025 |
Luke | Summary | General | Cleanroom cleaning |
[Luke, Cece, Luis]
Particle Count Measurements:
- Pre-cleaning (12:15 PM):
- Zone 3:
- 0.3 µm: 1325
- 0.5 µm: 265
- 1.0 µm: 0
- Zone 4:
- 0.3 µm: 618
- 0.5 µm: 132
- 1.0 µm: 44
- Started Cleaning (3:20 pm)
- Finished Cleaning (4:20 pm)
- Post-cleaning (4:35 PM):
- Zone 3:
- 0.3 µm: 1106
- 0.5 µm: 221
- 1.0 µm: 0
- Zone 4:
- 0.3 µm: 530
- 0.5 µm: 44
- 1.0 µm: 0
|
Attachment 1: 20250131_particalcount.png
|
|
506
|
Fri Jan 31 15:03:09 2025 |
Xuesi Ma | Update | | Heater Element Circuit Check |
[Ma] Wed 1/29/2025
No short circuit between heater element ✓
No short circuit to ground on any pin ✓
No short circuit between connectors ✓
Heater Number |
Power Resistor before (Ohm) |
Power Resistor now (Ohm) |
RTD Resistor before (Ohm) |
RTD Resistor now (Ohm) |
1 |
73.6 |
73.1 |
81.8 |
81.3 |
2 |
70.4 |
69.6 |
82.1 |
81.6 |
3 |
71 |
70.5 |
84.5 |
84 |
4 |
71.5 |
71 |
80 |
79.4 |
5 |
70.5 |
70.2 |
81.7 |
81.2 |
6 |
72 |
71.6 |
79.4 |
78.7 |
7 |
69.2 |
69 |
78.2 |
77.5 |
8 |
71.1 |
70.6 |
84.2 |
83.6 |
|
505
|
Tue Jan 28 13:30:46 2025 |
shane | Update | CDS | Serial comms testing update |
Attempted to communicate with the smaller vac pump (TwissTor 74) via Agilent software today. Was able to communicate with the pump via python serial connection code as usual, with no issues. When using the manufacturer software though, it was unable to 'locate' the pump and failed to connect to it. So manufacturer software works for the big (older) pump, but not the smaller, newer one. Unclear if this is somehow related to the fact that using the manufacturer software for the bigger pump involved manually connecting its controller to spica with a db9, and there was no obvious way to do that for the smaller pump's controller. |
504
|
Mon Jan 27 23:35:28 2025 |
Xuesi Ma | Update | | |
[Ma]
Installed all the pins to the peek DB 25 connectors |
Attachment 1: 20250127_142647.jpg
|
|
Attachment 2: 20250127_153454.jpg
|
|
Attachment 3: 20250127_154516.jpg
|
|
503
|
Mon Jan 27 11:29:38 2025 |
Xuesi Ma | Update | | Heater Element Test |
[Ma, Cece, Luke, Mary, Shane]
On Friday (Jan 24), we installed the heater elements on the stand. The heater elements are arranged from 1 to 8, oriented from right to left as shown in Attachment 1. Each wire has been labeled according to its corresponding element number and type (e.g., RTD connections, heater connections).
Note: We currently do not have enough PEEK zip ties, so standard zip ties have been used temporarily. These must be replaced with PEEK zip ties before the setup is placed in the vacuum chamber. |
Attachment 1: 20250124_165434.png
|
|
Attachment 2: 20250124_165342.png
|
|
502
|
Sat Jan 25 18:19:39 2025 |
Luke | Update | General | Ringheater modeling Update |
Here is a quick update on some of the things I have been working on regarding my project. |
501
|
Wed Jan 22 10:50:08 2025 |
Tyler | Update | TCS | FROSTI Disassembly |
[Tyler, Ma, Cece, Luis, Shane, Luke, Cynthia, Liu, Jon]
On Tuesday (Jan 21), we took the FROSTI apart in front of a filming crew. It was a success! The footage is going to be used in an APS video detailing the experimental cosmology research conducted in the department.
The FROSTI reflectors, heater elements, and legs were all bagged separately and a currently being stored in the cleanroom. If you need to do any work in there, please be mindful of these parts. The elements are currently on the shelf above the optical table, and the reflectors are placed on the table in the back corner. |
Attachment 1: IMG_1843.png
|
|
Attachment 2: IMG_1844.png
|
|
Attachment 3: IMG_1849.png
|
|
Attachment 4: IMG_1850.png
|
|
500
|
Tue Jan 21 10:12:02 2025 |
Luke | Summary | General | Frosti toy model |
[Luke, Liu]
Over the winter break I have been working on this desmos toy model of the Frosti. There are still a few rough spots but I belive that it is a good visual representation of a 2D slice of the frosti. |
499
|
Fri Jan 17 13:27:07 2025 |
Tyler | Update | TCS | FROSTI Pre-disassembly |
[Tyler, Ma, Cece, Jon, Luke, Cynthia, Michael]
On Tuesday, we prepared the FROSTI for disassembly in anticipation of the APS filming that is set to take place in the labs. The FROSTI has been unbolted from the optical table in the cleanroom, with its wires weighted down and the majority of its screws removed to ensure an easy removal of the reflectors during the filming process.
|
Attachment 1: IMG_1828.jpeg
|
|
Attachment 2: IMG_1830.jpeg
|
|
498
|
Tue Jan 14 10:27:14 2025 |
Tyler | Update | TCS | RIN Updates |
[Tyler]
Attached below are updated plots for the FROSTI RIN measurements for Jan 14 group meeting.
|
Attachment 1: ASD_plots_01_14_2025.pdf
|
|
497
|
Wed Jan 8 17:35:57 2025 |
Luke | Summary | Cleanroom | Cleanroom cleaning |
[Luke, Tyler, Cynthia, Shane, Michael]
Summary of Cleaning Activities:
We began cleaning Room 1119 at 2:00 PM.
At 2:30 PM, we moved to Room 1129 and continued cleaning.
Cleaning tasks included wiping down dust-collecting surfaces and vacuuming the floors.
Once the labs were clean, we proceeded to the cleanroom.
- Wiping down surfaces and soft walls
- Vacuuming, mopping the floor, and finishing with IPA wipes
Particle Count Measurements:
- Pre-cleaning (2:30 PM):
- Zone 3:
- 0.3 µm: 973
- 0.5 µm: 354
- 1.0 µm: 132
- Zone 4:
- 0.3 µm: 486
- 0.5 µm: 177
- 1.0 µm: 0
- Post-cleaning (4:10 PM):
- Zone 3:
- 0.3 µm: 619
- 0.5 µm: 132
- 1.0 µm: 0
- Zone 4:
- 0.3 µm: 397
- 0.5 µm: 0
- 1.0 µm: 0
|
Attachment 1: partical_count_250108.png
|
|
496
|
Thu Jan 2 17:52:58 2025 |
Luis | Update | VAC | MR Testing Continuation |
[Luis, Luke]
RGA Volume: T = 22°C, P = 2.10e-9 Torr
Main Volume: T = 21°C, P = 5.71e-9 Torr
Measurements of the current state of the vacuum systems were taken today, now that the system had reached UHV status, the results are attached bellow. The first plot overlays the data of the empty chamber taken on 12/16/24 before inserting the MR material, and the data of the system today, with the MR inside. The second plot displays the S/N Ratio of the system. The last plot displays the data of the system with the Ar leak open and closed. Notice that it is common for the Ar leak close data to fail due to the calculation of the gas flux per unit ion current, which is dependent on the Ar peak.
|
Attachment 1: 2024-12-16_PostBake2_ArO_overlay.png
|
|
Attachment 2: 2025-1-2_MR-Bake1_ArO.png
|
|
Attachment 3: 2025-1-2_MR-Bake1_ArC_overlay.png
|
|
495
|
Mon Dec 23 14:33:36 2024 |
Tyler | Update | TCS | Latest RIN Measurement Results |
Attached below are the measurements I took from the FROSTI from 12/18-12/22. |
Attachment 1: Updated_ASD_plots.pdf
|
|
Attachment 2: Dark_Noise_Thermal_ASD_plots.pdf
|
|
Attachment 3: DC_Voltages.pdf
|
|
Attachment 4: RP-2.jpg
|
|
494
|
Sun Dec 22 20:43:35 2024 |
Luis | Update | VAC | MR Testing |
[Luis, Luke]
RGA Volume: T = 23°C, P = 3.0e-9 Torr
Main Volume: T = 22°C, P = 9.90e-9 Torr
After letting the vacuum cool down for a couple days, we reattached the magnets and sensors, then we performed a RGA scan of the vacuum system, now containing the MR sample. The results are attached below. Something to notice is that we are technically not under UHV, though Luke and I believe the reading of the sensor is not completely accurate since it was still coming to a steady state, further test will be performed when the physics building is open again.
|
Attachment 1: 2024-12-13_PostBake2_ArO_Degas_overlay.png
|
|
Attachment 2: 2024-12-22_MR-Bake1_ArO.png
|
|
493
|
Thu Dec 19 12:00:44 2024 |
Luke | Update | VAC | End of bake |
The vacuum chamber has stopped baking.
Current state as of 11:40, 12/19/2024:
The gate valve is open, and the filament of the RGA is on.
The temperatures were steady at:
PID right: barrel upper: 129°C, RGA volume: 125°C
PID left: barrel lower: 125°C, Lid: 114°C
The RGA flange was 37°C
Cleanroom was 26°C
Note the upper barrel was very close to the emergency shut off temp of 130°C. In the future we may want to either rewire some of the heating tape or lower the set temperature of the right PID controller.
Luis and I are planning on taking an RGA scan of the MR on Sunday before the campus shuts down for the holidays. |
492
|
Wed Dec 18 15:41:56 2024 |
Tyler | Update | TCS | FROSTI RIN |
[Tyler]
I have begun the (hopefully) final RIN measurements at 3:30 PM today. If you need to go into the cleanroom at any time between now and Sunday (the 22nd), please do not touch the FROSTI, the Red Pitaya, the photodetectors, or any of the wiring. |
491
|
Tue Dec 17 13:53:53 2024 |
Luis | Update | VAC | Vacuum system status |
[Luis]
The vacuum system is being baked. I disconnected the digital gages and the magnets, opened the Ar leak and started the bake by taking the temperature from 60C-90C-125C waiting about 15-20 minutes between each interval. The RGA electronics were left on since the temperature of the flange was 36.6C (bellow the 60C threshold) |