 Thu May 4 14:01:10 2023, Peter, Update, VLC Electronics, 532nm Intensity Measurement 
|
I adjusted the rotational mount of the wave plate to see if the power can be 100% coupled into either S or P polarization. The images shown below of the
oscilloscope indicate that this is not possible. The minimum transmitted power we can obtain in either S or P polarization is 75mV. The maximum voltage
we obtain in either S or P polarization is ~ 740mV. This means that at a maximum, we can obtain ~ 90% polarization in either direction, indicating that |
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Tue May 2 17:03:14 2023, Jon, Cao, Physics, VAC, First pump-down test of vacuum chamber
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[Jon, Cao]
1. Re-routing of cables
We re-routed the connections between the turbo pump and its fan to the controller. Instead of going through the side of the server rack, they |
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Tue May 2 15:55:33 2023, Peter, Update, VLC Electronics, 532nm Intensity Measurement
|
I changed the 1/2 wave plate from the lens mount to the rotational optic mount. This allowed me to rotate the 1/2 wave plate, which changed the respective
polarization power transmitting through S and P polarization. Initially, more power was coupled into the P polarization. Now, with the 1/2 plate rotated,
both channels are experiencing the same voltage reading. Before feeding the PDA signals into the red pitaya, a 50 ohm terminator had to be placed at the |
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Mon May 1 18:56:57 2023, Peter, Update, VLC Electronics, 532nm Intensity Measurement
|
I've configured the two PDA's to the Red Pitaya. I put a 50 ohm resistor connector to each red pitaya input port. This was because the oscilloscope showed
that the voltage reading from the P polarization PDA was almost at 1V, which was the limit of the red pitaya. Once both S and P polarization PDA's were
connected, I opened the red pitaya's oscilloscope. A screenshot of the voltage readings is shared below. Channel 1 (Yellow) is for S polarization. Channel |
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Mon May 1 17:10:25 2023, Julian, Cao, Physics, VAC, Installing Pirani gauge and RGA probe onto to vacuum chamber
|
[Julian, Cao]
03:00 pm: Particle count
: Zone 3
0.3 um: 498
0.5 um: 124
1 um: 124
:
Zone 4
0.3 um: 748
0.5 um: 457
1 um: 374
03:32 pm: Installing Pirani |
|
Thu Apr 27 09:48:34 2023, Aiden, Summary, General, Batch 12 Bagging
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I took batch 12 out of the oven and put them in a bag and placed the bag inside the clean room in the first large stainless steel container.
I also looked
at the small gauge that we felt like needed to be baked and I can confirm that without further cleaning around the inside of the gauge it should not be
connected to the main vacuum. I have attached a photo of the inside of the gauge. |
 Fri Apr 28 19:39:19 2023, Cao, Summary, General, Clean and Bake Leybold TTR 91 Pirani Gauge
|
Quote:
I took batch 12 out of the oven and put
them in a bag and placed the bag inside the clean room in the first large stainless steel container.
I also looked at the small gauge that we felt like |
|
Fri Apr 28 19:00:13 2023, Cao, Physics, VAC, Tighten CF ports on vacuum chamber
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[Cao]
After Jon's comment yesterday that some of the connection did not seem to have good metal-metal contact, in particular the gate valve connection,
I went through the ConFlat connections today and retighten them.
I found a lot of the CF connections are not particularly tightened and there were a lot
of range left that can be tightened with the wrench. After re-tightening, the copper gaskets are not visible anymore. For example, see the attached images |
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Thu Apr 27 16:23:44 2023, Cao, Pamella and Julian, Physics, VAC, Installing vacuum system (cont.)
|
[Pamella, Cao and Julian, Shane]
Particles account
10:37 am: Starting the particles account
Zone 3:
0.3u: 1662
0.5u: 872
1.0u: 415
Zone 4:
0.3u: 831
0.5u: 124
1.0u: 0
11:14 am: Start removal of calibrated leak to install 45 deg elbow
11:21 am: |
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Thu Apr 27 21:43:07 2023, Jon, Physics, VAC, Grounding vacuum system
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This afternoon I made up a green 10 AWG grounding cable and connected it to the vacuum system.
One end is tightly connected to the bottom flange of the vacuum chamber (photo 1). It is run along and up the table framing to the top of the cleanroom,
where it exits into the overhead cable tray in the same location as the other power cables. It drops down from the top of the server rack all the way to |
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Fri Apr 28 18:16:57 2023, Cao, Physics, VAC, Grounding vacuum system
|
Quote:
This afternoon I made up a green 10
AWG grounding cable and connected it to the vacuum system. |
|
Fri Apr 28 11:21:01 2023, Peter, Update, VLC Update, Laser intensity/polarization drift measurements
|
The Digi-key cables have arrived, and I have began implementing them in the intensity drift measurements.
There was a slight problem initially in connecting
the SMA to BNC cables from the photodiode to the red pitaya, since the red pitaya was way on the other side of the lab. Cao and I connected the red pitaya
to a new ethernet cable that extended far enough for the red pitaya to sit comfortably on the breadboard with the optics.
Right now the PDAs are not |
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Wed Apr 26 18:05:41 2023, Pamella, Julian, Shane, Update, Cleanroom, cleanroom particle counts and cleaning log
|
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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Tue Apr 25 11:56:37 2023, Jon, Update, VLC Electronics, Red Pataya has arrived
|
| The Red Pataya 125-14 starter kit that we ordered for locking the 532 nm cavity has arrived. I left it laying on the optical table near the laser. |
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Mon Apr 24 17:38:45 2023, Aiden, Summary, General, Clean and Bake Batch 12
|
Today I Bagged and tagged the o-rings from batch 11 and placed them inside the clean room. I also cleaned batch 12 parts in liquinox for 10 minutes and
them placed them into the oven where they will undergo the following steps;
1. Ramp to 100 degC in 15 min.
2. Dwell at 100 degC for 30 min.
3. Ramp
to 200 deg C in 30 min.
4. Dwell at 200 deg C for 48 hours.
5. Off |
|
Fri Apr 21 16:51:26 2023, Pamella, Update, General, Cleaning cables.
|
Cables for the vacuum system.
Today i wiped, bagged and tagged two cables for the vacuum system. I used IPA wipes for cleaning this two split
power cord. I attached a image below.
|
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Fri Apr 21 15:21:18 2023, Pamella, Update, FLIR,
|
FLIR project updates
01:50 pm: Starting test position 34 mm distance to black wall.
Parameters : 0.100 A, 1.5 V and
the temperature inside the mirrors 40°C.
2:09 pm : Finished the test and figured out this position it is too far the black wall so now we change
for more close position.
2:17 pm: Starting test in another position: 10 mm distance to the black wall( this measurement |
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Wed Apr 12 16:13:19 2023, Cao, Physics, VAC, Vacuum prep and installation
|
Aiden, Pamella, Peter, Shane, Cao
Today we started vacuum chamber assembly work
10:16 am: Particle count measurement of clean
room
10:34 am: Particle counting finished: meets ISO 5 standard
Zone 3 :
0.3 u: 3159
0.5 u: 789
1.0 u: 83
Zone 4 :
0.3 u: 498
0.5 u: 41
1.0 u: 0
|
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Fri Apr 21 00:06:43 2023, Jon, Update, VAC, Vacuum prep and installation - parts have arrived
|
The two parts needed to complete the vacuum assembly (ELOG 70) have arrived.
(10) 5/16"-24 x 1 3/4" threaded rods - for attaching the turbo pump reducing nipple to the CF 4.5" gate valve;
(1) 45 degree CF
2.75" elbow for attaching the calibrated Ar/He leak to the chamber.
I left them laying on top of the ultrasonic washer. They both need |
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Wed Apr 19 17:39:50 2023, Pamella, Update, FLIR, FLIR project
|
FLIR project updates- Initial tests
10:00: Starting test in position 2 cm to the black wall.
Parameters : 0,305
A, 05,5 V and the temperature inside the mirrors 141,8°C.
10:23 Finished this first tried and take snap. The image is attached below.
The name for the picture for this tried is “AcquisitionImage(Apr-19-2023_10 23)”.
10:37. Starting test in another position |
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Mon Apr 17 17:06:49 2023, Aiden, Summary, General, Clean and Bake batch 11
|
Cleaned the Viton O-Ring for the main chamber in Liquinox for 10 minutes. Then put it in the oven to back for;
1. Ramp to 100 degC in 15 min.
2. Dwell
at 100 degC for 30 min.
3. Ramp to 180 degC in 30 min.
4. Dwell at 180 degC for 24 hours.
5. Off
Note: There were three viton -rings in the bag sent
to us. I cleaned and baked 2 of them and left the third in the bag. |
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Wed Apr 12 16:17:50 2023, shane, Update, General, Particle Counter moved
|
With the added height of the new docking station, the particle counter no longer fits under the Windows monitor in the electronics rack and has been moved
to the desk in the corner of the lab. |
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Wed Apr 12 10:53:02 2023, Aiden, Summary, General, Valve Cleaning
|
Bagged and Tagged the parts from batch 10 and placed them inside the clean room.
Then cleaned the last gate valve in liquinox for 20 minutes (10 minutes
each side). Then dried the valve, bagged, tagged, and placed it inside the clean room. |
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Tue Apr 11 17:56:15 2023, Pamella, Update, General, Lab cleaning
|
Today Pamella and Julian finished cleaning of the cleanroom, starting with the HEPA vacuuming, mopping and clearing all floor with IPA wipes. Also we wiped
down some surfaces of the blue table, computer table and the top of chamber. |
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Tue Apr 11 13:15:40 2023, Cao, Infrastructure, Clean & Bake, Nitrogen gas tank replaced
|
The nitrogen gas tank has been replaced with a new unit. The new tank is ultra pure nitrogen (>99.9% nitrogen).
The new tank has been placed and secured
to the rack where the old one is; cap is removed and regulator is reinstalled onto the new tank. |
|
Fri Apr 7 09:48:09 2023, Pamella, Update, General, Clean the system parts 7x
|
Pamella and Julian wiped and tag system parts for the vacuum machine. We used isopropyl and vectra wipes in the most import pieces:
Inverted magnetron
pirani gauge and the air cooling kit 81. The other parts we uses the IPA wipe for cleaning.
So for now we finished with ever system parts which was in
the gabinetes.
I put photos below. The photos is for all part we cleaning, tag and which puted inside the cleaning room. |
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Thu Apr 6 10:20:43 2023, Peter, Update, VLC Update, Laser intensity/polarization drift measurements
|
More optical components were added to the optical set up for laser intensity / polarization drift measurements. Both lenses and both PDs were added to the
configuration, as seen in the image below. The beam is already well aligned into the center of both of PDs, and focused nicely by the lens.
Both PD's
take BNC connecting cables, and the Red Pitaya takes SMA connecting cables. Since we are currently without a BNC to SMA cable, and we do not want to cut, |
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Tue Apr 4 16:52:08 2023, Jon, Update, Cleanroom, Particle counter docking station
|
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 |
|
Tue Apr 4 16:43:53 2023, Jon, Update, VLC Electronics, Additional Thorlabs PDA10A2
|
I ordered a second PDA10A2 and mounting post + spacer (which puts the aperture at the VLC's standard 3" beam height). These arrived today and I delivered
them to the lab. They are sitting on the VLC table near the laser. |
|
Tue Apr 4 09:53:37 2023, Peter, Update, VLC Update, Laser intensity/polarization drift measurements
|
The set up for the next round of beam characterization measurements has begun. The beam is initially passing through a half waveplate, is split at a polarizing
beam splitter, and then stirring mirrors are used to properly aim the beam into photodiodes (not yet installed). This is the current configuration of the
set up. |
|
Tue Apr 4 09:39:58 2023, Peter, Update, VLC Electronics, 532 M2 Measurements
|
Final M squared measurements were taken Wednesday, 3/29/23 by Peter and Ryan Hinosawa. 5 separate sets of data were taken, and upon discussion, we declared
the plots shown below in attachment 1 and 2 as the final plots of our M squared measurements.
The optical design of the M squared measurement process
is given in attachment 3. The laser and three lenses shown below are mounted on the optical table. The track is placed behind the third lens, and the camera |
|
Mon Apr 3 17:04:05 2023, Aiden, Summary, General, IDP Scroll Pump Assembly
|
Aiden installed the isolation valve and the exhaust silencer kits on the IDP-3 Scroll pump. The entire assembly still needs to be wiped down but overall
no residue came off when putting on the kits. |
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Fri Mar 31 14:23:13 2023, Pamella, Update, General, Clean and bake batch 11
|
Today I bagged and tagged batch 11. I wiped the some tools: Centering ring alum( 2 pieces), reversible ratcheting, gasket removal (CF). After wiped that
I bagged and tagged this parts and put inside the cleanroom.
Also I wiped one power cable (3 meters), bagged and tagged that and inside the cleanroom.
I put photo below. |
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Wed Mar 29 16:00:36 2023, Pamella, Update, Cameras, FLIR project
|
Today Pamella and Tyler started work in the updates for the FLIR project.
We trie for the first time cover the mirrors with aluminum foil and run the
code with this.
We work in figured out how the python codes works with real datas.
To do:
Understand how get the real datas and how to compere that
with the old datas.
Starting test with the FLIR and mirrors with aluminum foil in with the power on.
Testing the FLIR camera more times with the mirrors |
|
Fri Mar 24 13:36:17 2023, Pamella, Update, General, Clean and Bake batch 10
|
Today I bagged and tagged batch 10.
I wiped the RGA vacuum component for around 25 minutes after that I bagged and tagged this part and put inside the
cleanroom. The RGA vacuum component have a big size and because off that i used the big bag.
I wiped one power cable (2 meters), bagged and tagged that
and inside the cleanroom.
For the parts in the oven, a bunch of screws, I bagged and tagged the screws and put inside the cleanroom.
I put photos below |
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Wed Mar 1 21:50:46 2023, Jon, Infrastructure, Computers, Workstation 2 (ws2) mounted on cleanroom cart
|
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
|
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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Thu Mar 23 18:40:08 2023, Julian, Update, General, Cleanroom Update
|
| Today Pamella and I came in to Hepa vacuum and mop the floor of the cleanroom for general maintenance. |
|
Wed Mar 22 15:25:00 2023, Shane, Update, General, Clean room recertification particle counts
|
Attached are the five zone particle measurements for the clean room now that the fan speeds have been set to MEDIUM. 2 min sample time, 3 samples per zone.
The occupied clean room measurements were unusual in that they generally got larger towards minute 6 instead of settling and going to zero, and for this
reason didn't stay beneath the class 5 requirement at the end of the samples. The unoccupied counts look more similar to what was expected, and generally |
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Wed Mar 22 12:16:20 2023, Jon, Infrastructure, Cleanroom, Experimenting with HEPA fan speeds
|
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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Fri Mar 17 19:46:39 2023, Aiden, Summary, General, Clean and Bake batch 9
|
Bagged and Tagged the reflector arms and bases and placed them inside the clean room. Total of 2 bags used. Cleaned and Baked parts in batch 9 on the spread
sheet and used the following procedure;
1. Ramp to 100 degC in 15 min.
2. Dwell at 100 degC for 30 min.
3. Ramp to 200 degC in 30 min.
4. Dwell at
200 degC for 48 hours.
5. OFF
Also soaked the 2.75" CF gate valve in acetone to try and clean the open threads around the part. Then cleaned it in |
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Tue Mar 14 18:21:41 2023, Aiden, Summary, General, Clean and Bake batch 8
|
Starting off Peter and I refilled the deionized water barrel.
Then Aiden Cleaned and Bake the FROSTI arms and bases in liquinox for 5 minutes. Then placed
them in the oven where they will undergo the following steps;
1. Ramp to 100 degC in 15 min.
2. Dwell at 100 degC for 30 min.
3. Ramp to 120 degC in
30 min.
4. Dwell at 120 degC for 48 hours.
5. OFF
Also cleaned the 2.75 MDC Gate valve for 20 minutes (10 minutes each side) in liquinox. It looks |
|
Fri Mar 10 12:08:09 2023, Peter, Update, VLC Electronics, 532 M2 Measurements
|
Took more M2 laser data today. The configuration is the same as before except now the beam camera is the only component moving. Pictures can be seen below.
The beam shape in x and y is very consistent with low error. However, the M2 value is still a bit high. |
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Thu Mar 9 13:51:42 2023, Shane, Update, General, Clean room counts 3/9/23
|
Here's the clean room counts from this morning. Also attached is rough diagram of where the five zones are in the clean room. Counts taken with 2 minute
sample time, three samples in each zone. |
|
Thu Mar 9 12:03:59 2023, Peter, Update, VLC Electronics, 532 M2 Measurements
|
Took more M2 Data today. Picture of the optical set up is shown below. lens1 f = 100mm, lens2 f = 50mm, lens3 f = 150mm. There was a nice converging/diverging
beam profile, and the beam waist was able to be read by the camera. I took as much data as I could before clipping loss. The M2 value is quite high. |
|
Wed Mar 8 19:29:00 2023, Aiden, Summary, General, Clean and Bake batch 7
|
Today gave another cleaning to the MDC gate valve. It is still very dirty an will need more cleaning. I also cleaned the other 3 valves and the argon leak.
These are also in bags inside the clean room. I cleaned them by hand with IPA wipes and had to specifically give the MDC up to air valve a harder clean
with acetone as it was not getting clean with the IPA. This valve still has a ring around the face as shown in the first image. Be very cautious when moving |
|
Wed Mar 8 18:35:52 2023, Pamella, Update, , Lab cleaning
|
Today Pamella finished cleaning of the cleanroom, starting with the HEPA vacuuming, mopping and clearing all floor with IPA wipes.
Also Pamella and Julian
finished cleaning of lab floor, starting with the HEPA vacuuming and mopping.
Shane and Pamella wiped down every surfaces of the laser table, computer
table and the table with the vacuum pieces inside the cleanroom.
Shane, Peter, Tayler, Pamella and Julian then wiped down every surface of the laser table |
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Mon Mar 6 18:48:43 2023, Pamella, Update, General, Cleanroom update
|
Today Pamella and Julian finished cleaning of the new lab cabinets. Also we wiped the computer and put inside the cleanroom so now the computer is not
move out side anymore.
We saw some dirty parts in the cleanroom floor again and is possible for the next step we should be clearing the floor one more
time.
Possible is necessary order more IPA wipes for keep cleaning in nexts weeks.
A photos of the cabinets and the computer are attached below. |
|
Mon Mar 6 15:32:58 2023, Jon, Infrastructure, General, Cabinet installation completed
|
Jon, Cao, Peter
This morning Facilities delivered and installed two new cabinets with sliding glass doors.
The smaller of the two (36" W x 13" D x 84" H) has been installed in the Clean & Bake area adjacent the flow bench. The larger one (48" x 16" |
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Sat Mar 4 00:34:46 2023, Julian, Update, General, Cleanroom Update
|
Today I was able to finish cleaning the frame of the laser table, and for good measure I wiped down the tabletop and exterior of the vacuum chamber when
I was finished. I was also able to go through and wipe down the bags containing the vacuum parts as well as the tabletop of the workbench. |
|
Fri Mar 3 19:13:33 2023, Aiden, Summary, General, Clean and Bake Batch 6
|
Started to clean the dirtiest of the valves. I could not finish but I definitely made good progress on it. The MDC valve is very dirty and there are many
places I could not reach with my fingers. I used Acetone and IPA for this first round of cleaning on it.
I also was going to bag the viton O-Ring from
the previous Batch, however it seems to have broken during the bake and I am leaving it inside the oven for now. |
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Thu Mar 2 20:53:56 2023, Julian, Update, General, Cleanroom Update
|
Today Pamella and Julian began the final cleaning of the cleanroom, starting with the HEPA vacuuming and mopping then wiping down every surface of the laser
table. We wiped the main tabletop as well as the legs, but we were unable to completely wipe down the upper frame of the table before we had to leave.
For next steps, Julian will come in on Friday and finish cleaning the frame, then both of us will come in on Monday to finish the final cleaning. |
|
Wed Mar 1 21:27:20 2023, Jon, Infrastructure, Cleanroom, Over-table shelf height raised
|
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. |
|
Tue Feb 28 19:37:22 2023, Aiden, Summary, General, Clean and Bake batch 5
|
Bagged and Tagged batch 4 parts by placing no more than two part numbers per bag and taped them with kapton tape and labeled them with their name and part
number. Then placed them in the clean room on the work bench. Cleaned batch 5 part (Viton O-Ring) with liquinox and placed the into the oven for 5 steps;
1. Ramp to 100 degC in 15 minutes. 2. Dwell at 100 degC for 30 minutes. 3. Ramp to 180 degC in 30 minutes. 4. Dwell at 180 degC for 48 hours. 5. Turn off |
|
Tue Feb 28 19:33:51 2023, Peter, Update, , 532 M2 Measurements
|
| Y axis of plot in units of micrometers. X axis in units of millimeters. |