ELOG ligo-ex

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 SMA connection port so that the input power into the red pitaya did not exceed 1V. With this configuration, both channels experience about 0.35mV. (See attached) I then opened the Jupyter notebook, and ran a demo time series measurement from the red pitaya. This time, I was able to get a plot featuring both channels (green is P polarization. Blue is S polarization). The plots are consistent with what is shown in the red pitaya oscilloscope. However, the time collection (I'm assuming) only runs for about 0.018s. I will have to write some of my own code to loop over this measurement, and collect more data.

Attachment 1: IMG-0221.jpg

Attachment 2: IMG-0222.jpg

Attachment 3: graphs(1).jpg

Attachment 4: Time_Series_Trial_2.png

Mon May 1 18:56:57 2023

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 2 (Green) is for P polarization. It would seem that there is a significant amount of polarization in the P direction as opposed to the S direction. I then tried running the template time series measurement within the python notebook from channel 1 only. The python notebook graph is shown below. I have not figured out what are the units of time on the x axis, and I have not figured out how to change the amount of time that the red pitaya takes data. A plot of the time series measurement is shown below.

Attachment 1: graphs.jpg

Attachment 2: Time_Series_Trial_1.png

Mon May 1 17:10:25 2023

Julian, Cao

Installing Pirani gauge and RGA probe onto to vacuum chamber

[Julian, Cao]

03:00 pm: Particle count
1. : Zone 3
  - 0.3 um: 498
  - 0.5 um: 124
  - 1 um: 124
2. : Zone 4
  - 0.3 um: 748
  - 0.5 um: 457
  - 1 um: 374
03:32 pm: Installing Pirani gauge onto pump line
03:51 pm: Finish installing Pirani gauge, start installing RGA probe
04:03 pm: Finish installing PRGA probe, start routing cable from gauge controller to Pirani gauge
04:30 pm: All ethernet cables are routed and connected to gauge controllers
04:48 pm: Power gauge controller up, all gauges are recognised and readout shows atmospheric pressure as expected (1000 mbar)
04:51 pm: End-of-work particle count
1. : Zone 3
  - 0.3 um: 1413
  - 0.5 um: 872
  - 1 um: 623
2. : Zone 4
  - 0.3 um: 374
  - 0.5 um: 166
  - 1 um: 166

We also closed all the valves so we can start testing vacuum pump down of isolated volume tomorrow.

Attachment 1: PXL_20230501_225241491.jpg

Attachment 2: PXL_20230501_235854958.jpg

Attachment 3: PXL_20230501_234750795.MP.jpg

Fri Apr 28 19:39:19 2023

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 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.

�

Following the problem with contamination particles observed in the the Leybold thermovac TTR 91, we have taken the following step to clean the gauge:

Wipe with IPA-wetted Vectra Alpha: Cover the tip of a ziptide with Vectra Alpha wipe corner that has been wetted with IPA, push the wipe around and remove visible particulates
Fill the gauge flange with IPA: (following Jon's recommendation to use Lesker's procedure for cleaning their Pirani gauge), flip the gauge up such that the CF flange points upward, fill the flange with IPA all the way up. Use the tip of a SSTL tweezer to agitate the IPA. Let it sits for 20 minutes, agitate every 5 minutes. After 20 minutes, pour the IPA out then spray with dry pure nitrogen
Passive drying : Let the gauge sit inside the flowbench for 3 hours (3:30 pm to 6:30 pm)to ensure all IPA has evaporated
Baking : Leave the gauge in oven at 50 degree C for 48 hours (maximum allowed temperature is 65 deg C, we use 50 deg C to ensure we are well below this limit). Baking started at 7pm, should finish on Sunday 7pm and ready for assembling to vacuum chamber on Monday morning

Fri Apr 28 19:00:13 2023

Tighten CF ports on vacuum chamber

[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 for the difference before and after tightening.

Note for future installation of CF

After tightening the bolts/ screws in jumping order (to provide uniform torque) and there is resistance appearing in further tightening, start going through each screw/ bolts in a direction, each time applying a small torque until it resists to further tightened
After each time going all the bolts/ screw and returning to the starting point, one will find they can further tighten the screws/ bolts. Repeat the process until no further tightening can be achieved
The copper gasket should not be clearly visible at the connection

Attachment 1: TightenCF.png

Fri Apr 28 18:16:57 2023

Grounding vacuum system

Quote:

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 the bottom, where the other end is connected to the lab's electrical ground in the rear of the 240 V UPS (photo 2).

The connections were confirmed to be secure, but continuity testing with an ohmmeter remains to be done to confirm that the chamber and tabletop are indeed grounded.

�

[Cao]

Continuity Test

Following from Jon's grounding work on the vacuum system, I did a continuity test with the afternoon with a multimeter. The chamber is indeed grounded:

Chamber wall to optical table: continuity confirmed, resistance: 0 Ohm
Chamber wall to ground point connection on chamber: continuity confirmed, resistance: 0 Ohm
Turbo pump to ground point connection on chamber: continuity confirmed, resistance: 0 Ohm
Turbo pump to optical table: continuity confirmed, resistance: 0 Ohm
Optical table to chassis frame outside cleanroom: continuity confirmed, resistance: 0 Ohm
Front of chassis frame to earth point: continuity confirmed, resistance: 0 Ohm

Fri Apr 28 11:21:01 2023

Laser intensity/polarization drift measurements

VLC Update

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 connected to the red pitaya. I have connected them to the oscilloscope in order to read out how much voltage they produce upon incidence of 532nm laser light. This was done in order to make sure that they do not surpass the limit of the red pitaya (+-1V). I have not acquired a value for the readout voltage of the PDAs since I had to go to class. I will gather this preliminary data soon.

Attachment 1: IMG-0183.jpg

Thu Apr 27 21:43:07 2023

Grounding vacuum system

This afternoon I made up a green 10 AWG grounding cable and connected it to the vacuum system.

The connections were confirmed to be secure, but continuity testing with an ohmmeter remains to be done to confirm that the chamber and tabletop are indeed grounded.

Attachment 1: IMG_0141.png

Attachment 2: IMG_0140.png

Thu Apr 27 16:23:44 2023

Cao, Pamella and Julian

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: Elbow installed, re-install calibrated leak back on
11:29 am: Finished re-install calibrated leak, start installing gate valve on pump line
11:47 am: Finished installing gate valve, start installing reducing cross onto gate valve
12:02 pm: Finished installing reducing cross, start installing 90 deg elbow to reducing cross
12:17 pm: Finished installing reducing cross, lunch break
01:24 pm: Come back to the lunch break.
01:26 pm: Start installing vacuum hose to elbow.
01:40 pm: Finished installing vacuum hose.
01:43 pm: Start installing turbo pump.
02:00 pm: finished installing turbo pump .
02:10 pm: Start installing standard wall hose from turbo pump to scroll pump
02:21 pm: finished installing hose onto scroll pump, start installing lid. Remove lid from chamber, insert viton O-ring. Place lid back
02:30 pm: Secure lids with screw. Start installing turbo pump controller cable: Pass cable from outside (controller) up the top of clean tent and connect to 8 pin connector on turbo pump
03:00 pm: Installing air cooling unit for turbo pump, found 8 M3 screws for air cooling unit in the C&B cabinet to install the fan bracket onto the back of turbo pump. Fan control cable is routed up to the top of the cleanroom to the controller
03:15 pm: Installing full-range gauge cable to the controller outside cleanroom. Ethernet cables 1 and 2 are used. Cable 1 is used on the RGA line gauge. Cable 2 is connected to the main body gauge. Cable1 and 2 are connected controller's channel 1 and 2 respectively.
04:00 pm: Finish installing gauges cables. Cables are routed up along the frame to the controller sitting outside the cleanroom
04:15 pm: Finished. End-of-date particle count
1. Zone 3:
  - 0.3u: 3699
  - 0.5u: 1454
  - 1.0u: 872
2. Zone 4:
  - 0.3u: 1662
  - 0.5u: 706
  - 1.0u: 290

Attachment 1: IMG_0139.png

Attachment 2: IMG_0136.png

Thu Apr 27 09:48:34 2023

Attachment 1: IMG_4279.jpg

Attachment 2: IMG_4278.jpg

Wed Apr 26 18:05:41 2023

Pamella, Julian, Shane

cleanroom particle counts and cleaning log

Cleanroom

pre-cleaning particle counts:
- zone 3
- zone 4
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 cleanroom floor
4:28 pm: Finished vacuuming cleanroom floor.
4:29 pm: Began mopping the cleanroom floor.
5:15 pm: Finished cleanroom clean.
6:00 pm: post-cleaning particle counts (full 5 zone measurement) attached below

Attachment 1: counts4_26_23.png

Tue Apr 25 11:56:37 2023

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.

Attachment 1: Red_Pataya.jpg

Mon Apr 24 17:38:45 2023

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

Attachment 1: IMG_4269.jpg

Attachment 2: IMG_4268.jpg

Fri Apr 21 16:51:26 2023

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.

Attachment 1: IMG_5416.jpeg

Fri Apr 21 15:21:18 2023

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 is between the black wall and the aluminum lid)
2:26 pm : Finished this second tried and take a snap. The image is attached below.
The name for the picture for this tried is �AcquisitionImage(Apr-21-2023_14 26)�.

The next step should be understand the problem with the shape and work in changes for get the triangle in the FLIR image.

Attachment 1: AcquisitionImage(Apr-21-2023_14_26).jpg

Fri Apr 21 00:06:43 2023

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 to cleaned and baked following the standard procedure for stainless steel, as the threaded rods are visibly dirty.

Attachment 1: SS_parts.png

Wed Apr 19 17:39:50 2023

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 now 3 cm distance to the black wall ( this is more close than the original position.)
Parameters : 0,348 A, 05,5 V and the temperature inside the mirrors 160,3�C.
10:57 Finished this second tried and take a snap. The image is attached below.
The name for the picture for this tried is �AcquisitionImage(Apr-19-2023_10 57)�.

11:03 Starting test another position 1.3 cm distance to black wall.
Parameters : 0,347 A, 05,5 V and the temperature inside the mirrors 158,7�C.
11:18 Finished this second tried and take a snap. The image is attached below.
The name for the picture for this tried is �AcquisitionImage(Apr-19-2023_11 18)�.

The next step should be fix the problem with the shape (aluminum foil lid).

Attachment 1: AcquisitionImage(Apr-19-2023_10_23)(1).jpg

Attachment 2: AcquisitionImage(Apr-19-2023_10_57)_(1).jpg

Attachment 3: AcquisitionImage(Apr-19-2023_11_18)_(2).jpg

Mon Apr 17 17:06:49 2023

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.

Attachment 1: IMG_4262.jpg

Wed Apr 12 16:17:50 2023

shane

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.

Attachment 1: IMG_6693.HEIC

Wed Apr 12 16:13:19 2023

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
1. Zone 3 :
  - 0.3 u: 3159
  - 0.5 u: 789
  - 1.0 u: 83
2. Zone 4 :
  - 0.3 u: 498
  - 0.5 u: 41
  - 1.0 u: 0
10:45 am: Assemble vacuum feedthrough
11:08 am: Finish assembling feedthrough
11:14 am: Assemble inverted magnetron pirani gauge
11:29 am: Finish assembling magnetron gauge
11:31 am: Assemble calibrated Ar Leak
11:47 am: Finish assembling Ar leak
11:49 am: Assemble up to up-to-air valve
11:59 am: Finish assembling up-to-air valve
12:00 pm: Break for Lunch
1:00 pm: Came back from lunch
1:20 pm: Assemble 45 degree elbow [RGA Line]
1:35 pm: Finish assembling 45 degree elbow
1:35 pm: Assemble Reducing nipple [Pump Line]
1:49 pm: Finish assembling Reducing nipple
1:53 pm: Attempt to install gate valve [Pump line] but bolts could not fit to the gap between 2.5" reducing nipple (0.95" length, shortest 5/16 bolt is 1.5" in total length).
Thickness of of CF flange on reducing nipple is 0.75" inch. Ideally, we want to have 0.2" engagement to the gate valve, thus0.95" + 0.25" head thickness = 1.2" > 0.95" gap.
We thus most likely will need a replacement for the reducing nipple. We decided we would hold up on installing the rest of the pump line until we have got components to fix this problem
2:05 pm: Assemble gate valve [RGA line]
2:15 pm: Finish assembling gate valve [RGA line]
2:18 pm: Assemble 4-way cross [RGA line]
2:30 pm: Finish assembling 4- way cross [RGA line]
2:37 pm: Assemble manual bellow sealed angle valve [RGA line]
2:43 pm: Finish assembling sealed angle valve [RGA line]
2:45 pm: Assemble inverted magnetron pirani gauge [RGA line]
2:55 pm: Finish assembling magnetron pirani gauge [RGA line]
2:56 pm: Assemble vacuum hose, thin wall [RGA line]
3:04 pm: Finish assembling vacuum hose, thin wall [RGA line]
3:45 pm: Packing up for the the day
4:00 pm: End-of-date particle count measurement
1. Zone 3
  - 0.3 u: 1080
  - 0.5 u: 124
  - 1.0 u: 83
2. Zone 4
  - 0.3 u: 540
  - 0.5 u: 83
  - 1.0 u: 83

Attachment 1: VacAssy230412.png

Wed Apr 12 10:53:02 2023

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.

Tue Apr 11 17:56:15 2023

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.

Tue Apr 11 13:15:40 2023

Nitrogen gas tank replaced

Clean & Bake

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

Clean the system parts

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.

Attachment 1: 645E597D-AEA6-4669-B967-08C82AA84D13.jpeg

Attachment 2: 2669F0AC-69BC-422B-8723-AD047F3EBEB6.jpeg

Attachment 3: 7731FE17-EDD2-46B4-B6E1-546531D98EC3.jpeg

Attachment 4: F8921950-63C3-4E03-B79E-0A4C8EDB8EF6.jpeg

Attachment 5: AA9374DB-377C-48BD-866B-D686AF945D09.jpeg

Attachment 6: B3CE9D1E-A01E-4747-9F01-D427097F340C.jpeg

Attachment 7: BAE63151-D3D1-41D9-881E-B6175544811C.jpeg

Thu Apr 6 10:20:43 2023

Laser intensity/polarization drift measurements

VLC Update

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, strip, and crimp what we have, then measurement process cannot proceed until we get the cables.

Attachment 1: Optical_Setup_4-6-23.jpg

Tue Apr 4 16:52:08 2023

Particle counter docking station

Cleanroom

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 today and I delivered it to the lab. I left it laying next to the particle counter in the electronics rack.

Attachment 1: Met_One_Dock.png

Tue Apr 4 16:43:53 2023

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.

Attachment 1: PDA10A2.png

Tue Apr 4 09:53:37 2023

Laser intensity/polarization drift measurements

VLC Update

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.

Attachment 1: initial_Intens_measure_set_up.jpg

Tue Apr 4 09:39:58 2023

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 is moved along the track to take successive measurements of the beam's width. This will allow us to see a change in the beam's width over its propagation direction. The raw data is given in attachment 4 as a Beam_Data_8_3lens.txt file. This is eventually what gets used to generate the plots shown below. The code to run the analysis on these measurements (as well as analysis on the Gaussian intensity profile fitting) can be found: git@git.ligo.org:uc_riverside/visible-light-cavity.git

Attachment 1: OmegaY_M2_Fit_8.pdf

Attachment 2: OmegaX_M2_Fit_8.pdf

Attachment 3: M2_Measurements_Set_Up.svg

Attachment 4: Beam_Data_8_3lens.txt

z-z0	x_width	y_width	x_error	y_error
-50	267	304	30	30
-40	227	261	30	30
-30	192	223	30	30
-20	167	194	30	30
-10	153	169	50	50
0	149	154	50	50
10	166	152	50	50
20	198	169	50	50
30	233	195	50	50

... 17 more lines ...

Mon Apr 3 17:04:05 2023

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.

Attachment 1: IMG_4244.jpg

Fri Mar 31 14:23:13 2023

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.

Attachment 1: 4AC705B8-D906-47E3-86E4-49E4967910E7.jpeg

Wed Mar 29 16:00:36 2023

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 covered with aluminum foil.

Attachment 1: 15D13FE3-48A9-4ACF-9422-07032DD8D028.jpeg

Fri Mar 24 13:36:17 2023

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 about this process.

Attachment 1: 260AEB73-02D0-4635-93B3-B2EB3269FB84.jpeg

Attachment 2: 59FD199A-A444-439A-8D51-C242B65BBECD.jpeg

Attachment 3: 9A48A0EE-5EFE-409D-ACC0-17011F6F7EBF.jpeg

Attachment 4: 950F85B7-D304-4724-AB3D-B606E422F1E3.jpeg

Fri Mar 24 07:14:38 2023

Workstation 2 (ws2) mounted on cleanroom cart

Computers

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:

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 the cleanroom. Once the cleaned cart has been moved inside, it should never be brought back outside the cleanroom and should never be touched with ungloved hands.

I also upgraded the OS to Debian 11.6 and upgraded the CDS workstation tools.

�

Thu Mar 23 18:40:08 2023

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

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 settle under the class five requirement.

Attachment 1: counts3.22.23.pdf

Wed Mar 22 12:16:20 2023

Experimenting with HEPA fan speeds

Cleanroom

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.

We tested three configurations, in each case with all the FFUs on either HIGH (initial state), MEDIUM, or LOW. We measured the ambient noise in each configuration.

Fan speed	Noise inside cleanroom (dB)	Noise outside cleanroom (dB)
HIGH	80	70
MEDIUM	74	66
LOW	71	66

Going from HIGH to MEDIUM yields the largest improvement, reducing the ambient sound intensity by 6 dB (i.e., by a factor of 4, corresponding to a ~35% reduction in perceived volume).

An additional 3 dB of noise reduction can be achieved by further reducing the fan speeds to LOW. However, even after allowing some extended settling time (few hours), we found the particle counts to be fluctuating right at the threshold zone for ISO Class 5. Thus we dialed the fan speeds back up to MEDIUM with the expectation that this will be sufficient for Class 5 performance.

The cleanroom now needs to be recertified with a fresh round of five-zone particle count measurements.

Fri Mar 17 19:46:39 2023

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 the ultrasonic washer with liquinox for 20 minutes (10 minutes each side). It looks better than it used to but the threads still seem to be the problem and will probably need even further cleaning.

Attachment 1: IMG-4208.jpg

Attachment 2: IMG-4209.jpg

Tue Mar 14 18:21:41 2023

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 significantly cleaner in areas I could not reach before. However some areas like the flat bottom threaded holes are still very dirty. I also made sure to dry it thoroughly and wrapped it in UHV foil until I further cleaning is decided.

Fri Mar 10 12:08:09 2023

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.

Attachment 1: OmegaX_M2_Fit_4.png

Attachment 2: OmegaY_M2_Fit_4.png

Thu Mar 9 13:51:42 2023

Shane

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.

Attachment 1: particlecounts3.9.23.pdf

Attachment 2: clean_room_zones.JPG

Thu Mar 9 12:03:59 2023

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.

Attachment 1: OmegaY_M2_Fit_3.png

Attachment 2: OmegaX_M2_Fit_3.png

Attachment 3: optical_setup.jpg

Wed Mar 8 19:29:00 2023

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 the parts in the large ESD bag, it may be heavy and the parts will move inside.

Attachment 1: IMG_4180.jpg

Attachment 2: IMG_4182.jpg

Wed Mar 8 18:35:52 2023

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 outside the cleanroom. We wiped the main tabletop as well as the legs and all parts for the table. We wiped the computer desk, the boxes, the cabinets and every part outside the cleanroom. For now we finished the lab cleaning.

Mon Mar 6 18:48:43 2023

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.

Attachment 1: 203863E0-106A-465E-8D9C-461B0358FB60.jpeg

Attachment 2: 779F360D-CAD0-4C49-AE0B-973F97F6D099.jpeg

Attachment 3: 276B9F0C-6661-441F-AD34-D79DA61E1FC3.jpeg

Mon Mar 6 15:32:58 2023

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" D x 84" H) has been installed in the back of the room next to the electronics bench. Both cabinets have been securely anchored to the wall in two places each for earthquake safety.

We also installed the sliding glass doors and leveled them. However, we have not installed any of the shelves yet because the cabinets are quite dirty from the installation. Everything needs to be wiped down with IPA wipes, and it will be easier to do that before the shelves are in place.

Attachment 1: IMG_0088.jpg

Attachment 2: IMG_0089.jpg

Sat Mar 4 00:34:46 2023

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