• Cleaning the heater system parts.
• 09:13 am: Started wiping the last parts for the heater system (heating and cords).
• 10:18 am: Finished wiping the parts to the heater system (heating and cords). I wiped, tagged and bagged the heating and cords.
• Note: In some parts looks like the silicone insulation material is having some sort of residue on the wipe so I wiped very careful this part and just for a few minutes.
• 10:23 am: I putted all bags inside the cleanroom.

I attached the photos below.

Cleaning the heater system parts.
• 04:32 pm: Started wiping the heater system parts.
• 06:38 pm: Finished wiping the heater and some parts to the system. I wiped, tagged and bagged the heater system, power cables, adapter cables and power connectors. Also I wiped, bagged and tagged the aluminum foil tape.
• 06:43 pm: I putted all bags inside the cleanroom.
• To do: I started but I was not able to finished wiping the heating and cords for the heater system so I will finished this parts after.
• I attached the photos below.

• Used the closest point possible for the reflector in front of the FLIR camera.
• 11:32 am : Turned on the electronic device (current on) for started taking data.
• 11:50 am: Started checking the temperature and the parameters.
• 12:04 pm: Started taking snap after waited for 30 minutes with the current on. Parameters: Current: 0.13A , Volt: 1.8V and Temperature: 51.4 C.
• Note: This snap is in the most close point possible, after that I should be change the reflector position and also the optical focus distance in the FLIR camera.
We can see, in the photo attached below, thought in this closest position the cable connect to reflector is a bit problem to take a good snap also the have issues to keep very uniform triangles (temperature) in the reflector.
• To do: I'll change the position on the light inside to see if the problem it is in the focal point inside the reflector (mirror).

• Today we change the distance between the FLIR camera and reflector (3D-Mask with mirrors and light). Now the distance is 0.2032 m.
• Note: This distance is just for take a snap most close possible but we need move again for a little far way because in this distance we can't move up and down the reflector for have data to compare.

Test without the black wall.

Note: So today i collected data for some positions in axis Y (height) for starting analyses and compares the triangles shapes. I tried keep the same parameters every time.

First position:
• 01:20 pm : Started testing and collection data. Parameters: 0.10 A, 1.6V. Reference position: (0,0.05).
• 01:30 pm : Started snapping the screen. Parameters: 0.10 A, 1.6V and 37.7 C. Reference position: (0,0.05).
Second position:
• 01:34 pm : Started testing and collection data. Parameters: 0.10 A, 1.6V Reference position: (0,0).
• 01:44 pm : Started snapping the screen. Parameters: 0.10 A, 1.6V and 40.6 C. Reference position: (0,0).
Third position:
• 01:50 pm : Started testing and collection data. Parameters: 0.10 A, 1.6V. Reference position: (0,-0.05).
• 02:00 pm : Started snapping the screen. Parameters: 0.10 A, 1.6V and 39.1C. Reference position: (0,-0.05).
Fourth position:
• 02:03 pm : Started testing and collection data. Parameters: 0.10 A, 1.6V. Reference position: (0,-0.10).
• 02:13 pm : Started snapping the screen. Parameters: 0.10 A, 1.6V and 39.6 C. Reference position: (0,-0.10).

Test without the black wall.
General test:.
• 11:15 am : Started running the code. Parameters: 0.11 A, 1.9V and focus distance around 0.55m.
• 11:28 am : Started snapping the screen. Parameters: 0.12 A, 1.8V and 44.1 C .
First trying:
• 01:18 pm : Started testing and collection data. Parameters: 0.09 A, 1.4V. Reference position: (0,0).
• 01:28 pm : Started snapping the screen. Parameters: 0.10 A, 1.5V and 37.9 C. Reference position: (0,0).
Second trying:
• 01:34 pm : Started testing and collection data. Parameters: 0.08 A, 1.4V. Reference position: (0,-0.10).
• 01:44 pm : Started snapping the screen. Parameters: 0.09 A, 1.7V and 35.8 C. Reference position: (0,-0.10).
Third trying:
• 01:50 pm : Started testing and collection data. Parameters: 0.08 A, 1.3V. Reference position: (0,-0.05).
• 02:00 pm : Started snapping the screen. Parameters: 0.09 A, 1.4V and 35.4 C. Reference position: (0,-0.05).
Fourth trying:
• 02:04 pm : Started testing and collection data. Parameters: 0.09 A, 1.3V. Reference position: (0,0.05).
• 02:14 pm : Started snapping the screen. Parameters: 0.11 A, 1.6V and 41.7 C. Reference position: (0,0.05).

Note: So today i tried collecting data for every possible position in Y (height) way for starting analyses and compares the triangles shapes. I realize maybe we get a problem because i keep the same time in every try but the final temperature and the parameters change every time, so i will try do a better system to keep the parameters equal, maybe i can wait the reflector be back to a normal temperature after every test or keep the system on all the time and just change the reflector position. I pretty sure this was the problem.

• We changed the FLIR Focus Distance for around 0.55 m.
• Note: The old focus distance was 1.3 m.

• We tested this new focus distances and looks good. I attached a snap below.
Parameters: 0.1 A , 1.5 V and 38.4 C.

Cleaning room and particle count

• 09:58 am: Started the particle count
1. Zone 3:
2. 0.3u : 1,995
3. 0.5u : 540
4. 1.0u : 0
5. Zone 4:
6. 0.3u : 124
7. 0.5u : 0
8. 1.0u : 0

• 10:25 am: Started checking the surfaces inside the cleanroom.
• 10:30 am: Started vacuuming the floor.
• 10:45 am: Finished vacuuming the floor.
• 10:46 am: Started mopping the floor.
• 10:58 am: Finished mopping the floor.
• 11:00 am: Started wiping floor with polypropylene wipes.
• 11:03 am: Started and finished cleaning the mop buckets.
• 11:15 am: Finished wiping floor with polypropylene wipes.
• 11:16 am: Changed sticky floor mats.
• 11:20 am: Started the particle count.

1. Zone 3:
2. 0.3u : 2,951
3. 0.5u : 872
4. 1.0u : 207
5. Zone 4:
6. 0.3u : 374
7. 0.5u : 83
8. 1.0u : 0

Change the 3D mask
• Started removing the old mask in the reflector.
• Started cutting the new aluminum lid for the new 3D mask and assembling in the 3D mask.
• Started doing the new cable connections for the light.
• Started testing the resistance in the new cable connections. The multimeter show us 14.2 Ω.
• Started attaching the mask with the light and the thermometer sensor.
• Started assembling the 3D mask in the reflector.
• Started the initial tests.
• 2:00 pm: Started testing the new mask. Parameters: 1.4 V 0.1A and 27 C
• 2:38 pm: Started taking snap. Final parameters:1.4 V 0.1A and Temperature: 39.9 C
• Started doing some adjustments in the triangles shapes for the futures tests.

Initial tests
• 10:30 am : Started trying take some test with the new position/configuration between the 3D reflector-mask and the FLIR camera.
• 10:41 am : Started running the python code and take a snap. Parameters: 0.10 A, 1.4 V.
• 10:50 am : Started take the snap.It is possible see the triangles, this is a good thing. Negative thing: The middle/center point for the light maybe would be some problems for the future measurements. Parameters: 0.10A, 1.4 V and 41 C.
• 11:00 am : Started working to better align the entire structure. And double-check the distance between the 3D reflector-mask and the FLIR camera, following the instructions in Cassidy's Final FLIR Project Report.
• 11:10 am : Difficult point: I tried to attach the complete FLIR camera to the table, but I had a problem to secure the four screws to the table, the distance is not completely compatible with the table stand. Yesterday I just put two screws in the diagonal position, it works fine, but it's not the correct position to work.
• 12:00 am : Note: Two triangles take more long time to come back a not (low) irradiation position (east and south point).
• 2:00 pm : Started running the python code again.
• Parameters: 0.13 A 1.8 V.
• 2:30 pm: Started take snap. Parameters: 0.13 A, 1.8 V and 49.1 C
• 3:00 pm: Note: This time every triangles was able to come back a low irradiation position.

Reinstalling the mask and Reconfiguration FLIR position.
• Today i change the aluminum foil inside the 3D mask. After some tries i was able to have a better shape for the triangles.
• I reinstalled the connections (the light with the thermometer point). Also i checked for the focal point inside the reflector, looks fine.
• I did a reconfiguration for the initial tests, without the black wall. I moved the FLIR camera and the Reflector-Mask for other position on the table.
To do:
• Start the test with the power current on.
• I need figure out a better position for the light cables because in front of the mask isn't a good position for us do measurement.

• The new mask for the reflector.
• 1:40 pm: Started reconfiguration on the FLIR camera project. Changed the old bridge for the new mask-bridge.
• 2:00 pm: Started figure out the best way to cutting the aluminum foil with the new mask. Unfortunately, I had been some problems for cutting the perfect shape triangles with the mask because the size inside the triangle is different (smaller) than cutter/knife, so is not able to do the cut with precious and carefully then maybe I need other tool for this job. Also I tried use the scissor, didn't work. However, just for the initial testing I worked with the not perfect triangles shape.
• 2:49 pm: Started installing/attaching the light in the mask.
• 3:21 pm: Finished installing the light in the mask-bridge.
• 3:22 pm: Started testing the current and voltage in the new mask-bridge for make sure the light cable is working well.
• 3:25 pm: Started measurement the resistance with multimeter.
• 3:29 pm: The measurement looks fine. The multimeter show us 14.1 Ω;
• 3:38 pm: Started putting the reflector( with the mask attached) in front of the black wall.
• 3:44 pm: Started roll the testing with the python code to observer the behavior with this new mask. Parameters: 0.14 A and 1.9 V.
• 4:00 pm: Started snapping. Parameters: 0.13 A and 1.9 V. Final Temperature: 42.7 C.
• 4:02 pm: Started trying again with more current. Parameters: 0.16 A and 2.2 V.
• 4:36 pm: Started snapping. Parameters: 0.16 A and 2.2 V. Final Temperature: 50.3 C.
• 4:55 pm: For now, we can't see the triangles in the snap so i need do some changes.

• To do:
  1. Change the FLIR camera position for the other side on the table.
  2. Start the test without the black wall.
  3. Try a better tool to cut the triangles inside the 3D-mask.

Particle count:
• 10 am: Started particle count
1. Zone 3 :
   • 0.3u: 1288
   • 0.5u: 332
   • 1.0u: 124
2. Zone 4 :
   • 0.3u: 498
   • 0.5u: 166
   • 1.0u: 83
• 10:40 am: Checked the surfaces inside the cleanroom.
• 10:50 am: Started vacuuming the cleanroom.
• 11:15 am: Started mopping the cleanroom.
• 11:35 am: Started wiping the cleanroom floor.
• 11:40 am: Finished cleaning the cleanroom.
• 11:41 am: Started the particle count.
• 12:17 am: Finished the particle count.
1. Zone 3 :
   • 0.3u: 3782
   • 0.5u: 706
   • 1.0u: 207
2. Zone 4 :
   • 0.3u: 374
   • 0.5u: 83
   • 1.0u: 83

The display resolution of the logrus has been 1064x768 and has been the only option, which is not great. While remote access to logrus using rdesktop allows rendering a virtual display of user's chosen resolution, it is not fast when using graphic-intensive program. NoMachine allows user to take over and control the machine remotely and thus appears as the same machine. However, NoMachine cannot render a virtual display like rdesktop. This has been limiting the resolution of using logrus via NoMachine.

On Friday, I found that even though we had NVIDIA Quadro P600 graphic card installed, we were not actually using it. The monitor has been connecting to the the integrated VGA display connector. This uses Microsoft Basic Display Adapter which limits the the resolution. Today I got a HDMI to Mini-display cable to connector the monitor to the Nvidia graphic card. Then in Display settings, go to Graphic settings, then enable Hardware-accelerated GPU scheduling. After restarting the machine, the machine recognised the Display 2using the Nvidia Quadro P600. In multiple displays field, selected "Show only on 2" and remove the VGA connection to the monitor. Logrus is now set at Nvidia Qadro P600 native display resolution of 1920x1080. This is now also the display resolution in NoMachine.

[Aiden, Cao]

1. Helium leak test

• 2:00 pm: Uninstall regulator from nitrogen gas tank and move to helium gas tank. Place helium onto cart and move to the rear door of the clean tent. With the tank remaining outside, feed hose through the flexible wall to use in clean tent - See attached image
• 2:25 pm: Start Helium leak test: At each CF connection, He gas is sprayed while its level is monitored with the RGA in leak detection mode. A constant flow of helium is maintained until the level of helium detected by the RGA plateaus out.
  • All connections show low helium leak detected (< 3e-11 Amp)
  • The connections with highest leak detected are from reducing cross to flex hose and cross to RGA. They are on 2 - 3e-11 Amps. All other connections are less than 8e-12 Amps. We verified tightness of these two connection but they cannot be tighten any further

2. Argon calibrated leak test

• We opened the Ar calibrated leak. Upon opening the valve to allow Ar to flow through, we can see a surge in pressure measured by the gauges from 6.7e-7 mbar to 1.2e-6 mbar. This is then drop down and stabilised around 8.9e-7 after 5 minutes.
• Upon the the equilibrium is reached, we ran RGA scan twice in Analog mode with the following settings:
  • Points Per AMU: 10
  • Start Mass : 1
  • End Mass : 100
  • Focus Voltage: 90 V
  • Channel Electron Multiplier (CEM) : On
  • CEM Voltage: 1060 V
  • Unit: Amps (ion current)
  The settings is saved as rga100amu_scan.rga RGA application file in C:/Users/controls/Documents/Vacuum/VacuumChamber/RGA. The data file is saved in Data folder as ArLeak_230512.txt. This file contains the current values for corresponding AMUs. Using this dataset, we can obtain our chamber outgassing rate.
• Using RGA_scan_process.py , which is adapted from Mike Zucker's Matlab code E2000071, and the Ar calibrated leak posted in elog 95 we can compute the outgassing rate to be 150.5E-10 Torr l/s . Our outgassing rate is 37.5 times higher than the required (4.00E-10 Torr L/s per E080177)
• See image attached for the spectrum and the hydrocarbon (HC) tracer masses used to evaluate outgassing
• All codes and data are stored in Vacuum git repo . I'll qrite up an instruction to use the code and post it on our wiki page.

After finishing with Ar cal leak test, we close Ar valve, disconnect and turn off RGA. The He tank is moved back to the wall mount. The chamber is ready for baking installation

For future reference, the calibrated Argon source has a leak rate of 7.55E-8 atm cc/s, or equivalently 5.74E-8 torr L/s. This can be used to calibrate RGA scans to units of physical leakage (outgassing) rate.

Today I brought in a fresh supply of zip ties (we now have 1500 in the tool chest) and used them to permanentize the cable routing for the gauges, pumps, and RGA.

I also brought and installed a 3-foot 15A extension cable for powering the scroll pump. Installing the cable required shutting down the pumps, which I did and then reverted via the following procedure:

1. Close the 4.5" gate valve, 2.75" gate valve, and the bypass line angle valve.
2. Shut down the turbo pump.
3. Shut down the scroll pump.
4. Unplug the scroll pump and install the extension cable.
5. Power on the scroll pump.
6. Power on the turbo pump.
7. Open all three valves.

Incidentally, before I started, I noticed that the pressure in the main volume had reached 7E-7 torr, which is lower than the pressures seen last week. The system quickly returned to this pressure after I restarted the pumps.

Today we cleaned the clean-room (floor, surfaces) and particle count.

10:00 am: Started particle count.
• Zone 3:
• 0.3u: 1330
• 0.5u: 540
• 1.0u: 415
• Zone 4:
• 0.3u: 290
• 0.5u: 83
• 1.0u: 0

Clean-room:
• 10:30 am: Started wiping down the surfaces inside the clean-room
• 10:41 am: Finished wiping down the surfaces inside the clean-room and Started vacuuming the clean-room.
• 10:58 am: Finished vacuuming the clean-room.
• 11:00 am: Started mopping on the floor.
• 11:20 am: Finished mopping on the floor and started wiping on the floor.
• 11:34 am: Finished wiping on the floor.
• 11:35 am: Started the particle count.
• 11:57 am: Finished the particle count.

• Zone 3
• 0.3u: 997
• 0.5u: 290
• 1.0u: 207
• Zone 4
• 0.3u: 374
• 0.5u: 207
• 1.0u: 207

Today we started re-configuring the vacuum chamber components.

Particle count
• 10:45 am : Starting the particle count in the clean room.
• 11:13 am : Finished the particle count in the clean room.
• Zone 3 :
  • 0.3 u: 2535
  • 0.5 u: 1413
  • 1.0 u: 789
• Zone 4 :
  • 0.3 u: 457
  • 0.5 u: 290
  • 1.0 u: 207
  Starting the reconfiguration.
  • 11:21 am: Started removing up-to-air valve
  • 11:30 am: Finished removing up-to-air valve.
  • 11:33 am: Started removing calibrated Ar Leak and the elbow.
  • 11:35 am: Finished removing calibrated Ar Leak and started assembling the up-to-air valve.
  • 11:47 am: Finished assembling up-to-air valve.
  • 11:48 am: Started removing magnetron gauge.
  • 11:55 am: Finished removing magnetron gauge.
  • 11:57 am: Started installing the elbow and calibrated Ar Leak and started removing the RGA probe
  • 12:13 pm: Finished installing the elbow and calibrated Ar Leak.
  • 12:20 pm: Break for lunch.
  • 01:25 pm: Come back from lunch break.
  • 01:30 pm: Started removing RGA line.
  • 01:39 pm: Finished removing RGA line.
  • 01:39 pm: Started removing gate valve [RGA line] and finished removing gate valve.
  • 02:00 pm: Started installing gate valve in the new position.
  • 02:08 pm: Fished installing gate valve [RGA line].
  • 02:09 pm: Checked the screws in the elbow to gate valve. [RGA line].
  • 02:28 pm: Finished checking the screws in the elbow to gate valve [RGA line].
  • 02:29 pm: Started installing RGA line.
  • 02:39 pm: Finished installing RGA line.
  • 02:50 pm: Started installing magnetron gauge.(In this part we assembled gauge with the used gasket)
  • 03:02 pm: Finished installing magnetron gauge.
  • 03:04 pm: Started installing RGA probe [RGA line].
  • 03:13 pm: Finished installing RGA probe [RGA line].
  • 03:15 pm: Connected the cables to the magnetron gauge.
  • 03:20 pm: Started the testing in the vacuum chamber.
  • 04:30 pm: Started installing the RGA 200 and connected the cables (power cable and DB9 cable).
  • 04:52 pm: Finished installing the RGA 200 and connected the cables (power cable and DB9 cable).
  • 04:53 pm: Started testing the RGA connections. Logrus is able to recognize and connect to RGA unit. We are leaving the turbo pump on for a few hours before checking back for pressure readouts.
  • 05:00 pm : Starting the particle count in the clean room.
    1. Zone 3 :
       • 0.3 u: 2244
       • 0.5 u: 997
       • 1.0 u: 207
    2. Zone 4 :
       • 0.3 u: 2993
       • 0.5 u: 1579
       • 1.0 u: 498
  • 05:30 pm : Finished the particle count in the clean room.
  • 05:34 pm: Test pressure readout from the gauges.
    1. Channel 1 : 1.06E-5 mbar
    2. Channel 2 :8.89E-6 mbar
    3. Channel 3 :5.0E-4 mbar
  • 05:59 pm: Test pressure readout from the gauges.
    1. Channel 1: 9.09E-6 mbar
    2. Channel 2: 7.75E-6 mbar
    3. Channel 3: 5.0E-4 mbar

[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 are now routed along the the cable tray and came down from the top of the server rack.

2. Planning for vacuum assembly re-configuration

• Move the entire RGA arm to the mirrored CF port, where the Up-to-Air valve is at
• Move the Up-to-Air valve to the calibrated leak port
• Move the calibrated Ar leak the main chamber full-range gauge port
• Move the full-range gauge to the RGA line port

3. First test pump-down

1. With all valves closed, we started scroll pump, pump line quickly got down to 6.08 mbar from atmospheric 1000 mbar (measured by Pirani gauge, channel 3 on controller )
2. We open Lesker angled valve and let the RGA arm pumped down, Pirani gauge read 6.3 mbar while the full-range guage on RGA line reads 4.9 mbar ( channel 1 on controller )
3. We open the pump line gate to expose the pump to the main volume, all gaugues readout immediate rise back up 1000 mbar. After 3 minutes, we started to see channel 3 slowly dropped down. A minute later channel 1 and 2 (main body) also dropped down. The slow pressure dropping speed and 6.3 mbar measured earlier got us suspected that there is some large leaks
4. We proceed to tighten all the ports as the vacuum is pumped down. In particular, we found that large feedthrough port still required a lot of tightening up
5. As we tighten up all the ports, after 40 minutes, the gauges are now
   • Channel 1 : RGA line full-range gauge: 2.55E-1 mbar
   • Channel 2 : Main chamber full-range gauge: 2.60E-1 mbar
   • Channel 3 : Pump line Pirani gauge: 2.94E-1 mbar
   Compare this to the scroll pump manual , Table 1, page 3, the ultimate pressure of the scroll pump is 2.5E-1 Torr (3.3E-1 mbar), we thus managed to achieve scroll pump ultimate pressure
6. Turn on turbo pump : Change turbo pump controller from REMOTE to FRONT PANEL mode by pressing both "COUNTERS" and "MEASURE" buttons at the same time, select "MODE=FRONT"
7. Shorting interlock pin: since we do not have an interlock signal for the controller, use the provided DB-9 connector that has pin 3 and 8 shorted and connect this to the P1 IN connection at the rear of the controller (see attachment 1 )
8. Press "START" on the controller to start the turbo pump
9. The pressure readout from the gauges quickly dropped down. After 3 minutes, the Pirani range is maxed out at 0.5E-3 mbar. After 20 minutes, we recorded the following values:
   • Channel 1 : RGA line full-range gauge: 1.50E-5 mbar
   • Channel 2 : Main chamber full-range gauge: 1.89E-5 mbar
   • Channel 3 : Pump line Pirani gauge: 5.0E-4 mbar
   This is Medium vacuum , we want to further reduce this by 2 orders of magnitude. However, we can run RGA test + helium leak test at this pressure
10. Turn off turbo pump, wait for 10 minutes, turn off scroll pump, open Up-to-Air valve, all pressure gauges indicated pressure returned back to atmospheric pressure

3. To-do actions

• Run RGA test to get information about contamination status of vacuum
• Implement suggested changes in section 2
• Check and modify suspected poor connection: Pirani gauge on pump line. A gap can be seen between connection. There's no good way to tighten it with the screw. Maybe use threaded pin + hex bolt?
• Controller communications

[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

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

1. 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
2. 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
3. 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
4. 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

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

[Cao]

Continuity Test

• 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

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.

[Pamella, Cao and Julian, Shane]

• Particles account
• 10:37 am: Starting the particles account
1. Zone 3:
   • 0.3u: 1662
   • 0.5u: 872
   • 1.0u: 415
2. 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

• 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 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

• 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.

• 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)”.

Note: The second tried the temperature didn't up more than 40°C for 8 minutes so I change the current for a few seconds. I started with 0.98 A with 1.7 V and up until 0.350 A with 2.5 V, just for a few seconds and in this way the temperature up to 72°C and I get the snap.
The next step should be understand the problem with the shape and work in changes for get the triangle in the FLIR image.

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.

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).

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