ID |
Date |
Author |
Type |
Category |
Subject |
136
|
Tue Jun 27 21:47:56 2023 |
Jon | Infrastructure | VAC | Vacuum chamber bake attempt 1 |
The electrical overload problem encountered in ELOG 130 has been resolved. The two heater controllers, which draw up to 14.1 A each, overloaded the UPS and tripped one of its circuit breakers, shutting off power to both power strips mounted above the optical table.
I reset the circuit breaker and rerouted the two heater power cables instead to two separate 20 A outlets in the overhead cable tray outside the cleanroom (both on the LP3B 6 circuit). The two high-limit temperature controllers are now permanently positioned, as shown in the photos. For now, the PID controllers have been left sitting at the table level. I am ordering extension cords that will enable us to move those up to the overhead shelf, as well. I ran the heaters in their new configuration for several minutes without issue. Thus we should be able to now proceed with baking the chamber.
For future clarity, I added labels to power strips around the lab indicating which ones are powered by the UPS. To avoid overloading the UPS, only sensitive electronics or devices that could be damaged by a sudden loss of power should be connected to these. |
Attachment 1: IMG_0256.png
|
|
Attachment 2: IMG_0257.png
|
|
Attachment 3: IMG_0254.png
|
|
135
|
Tue Jun 27 15:18:26 2023 |
Pamella | Update | FLIR | New data collection |
Yesterday, I did a new data collection. I could get a better data in this time and I realized than I need use some angle on the reflector for got a better shot. I need do that because the FLIR camera just is able to get the triangle shape for complete if I keep exactly in same line for center point on the camera but for the data now I need move the refletor to go up and go down. So wasn't working very well if I keep the reflector without angle.
Now I am using the refletor with a angle. In the more high part I turn the mask for look the table and in the lower part I turn the mask to look up. I attached a photo below for this configuration.
Also the processes to get the data was the same than I using last time, the only diference is now I just moved the pillar after get data for high position and lower position for the same reference point on the triangle shape.
Note: In most data it is impossible to keep the same parameter for current, voltage and temperature. Most have a small variation but not a big difference. For example: I got the temperature in the first position 46.8 °C and in the second position I got 47.1 °C, it's just an example. It's just so we know that we don't have the exact same parameters all the time. In my opinion this is not a problem because it is just a small variation.
- 09:35 am: Turned on the device (current on). I wanted for 30 minutes before start get data.
- 10:05 am: Started taking snap on position one (Reference point: -0.10, 0.050). Parameters:0.11A,1.7V,46.8°C
- I took four snap on the same position for compare after on data analyzes. I just wanted one minute break between the snaps. I did the same for every position.
- 10:15 am: Started taking snap on position two (Reference point:-0.10,-0.050 ). Parameters: 0.11A,1.7V,47.1° C
- 10:22 am: Started taking snap on position three (Reference point:0.00 ,0.050). Parameters: 0.11A,1.6V,48.1°C
- 10:26 am: Started taking snap on position four (Reference point: 0.00,-0.050). Parameters:0.11A,1.6V,48 °C
- 10:32 am: Started taking snap on position five (Reference point: 0.05,-0.050). Parameters:0.11A, 1.6V, 48°C
- 10:37 am: Started taking snap on position six (Reference point: 0.05,0.050). Parameters: 0.11A,1.7V,47.6 °C
- We can see in the photos attached below every position also I am working in the analyzes.
|
Attachment 1: FLIR_data.002.jpeg
|
|
Attachment 2: FLIR_data_2.002.jpeg
|
|
134
|
Tue Jun 27 14:04:42 2023 |
Sophia A. | Update | Measuring Noise in Interferometer | Interferometer set up and connection to red pitaya |
Today we (Sophia and Tyler) constructed the set-up for the electrical noise calculation that I will be conducting this summer. I have included images of the setup below. Our system is effectively a green laser, that feeds into a type of polarizer, then into a beam splitter which sends the laser light down two arms into detectors. We started by connecting the detectors to an oscilloscope to determine whether the signal will exceed 1V, as the red pitaya (our planned data collection device) cannot receive signals with a higher voltage than 1V. We spent most of our time calibrating the oscilloscope and fine-tuning the set-up so that we would have approximately equal voltages in each arm of the interferometer. Once confirming that the output voltage would not meet or exceed 1V, we switched from an oscilloscope to the red pitaya for our measurements. Now that the system is set up, we will be able to run code in the red pitaya interface that will run an FFT on the signal, and then do noise analysis from there. |
Attachment 1: IMG_6756.jpg
|
|
Attachment 2: IMG_6754.jpg
|
|
Attachment 3: IMG_6755.jpg
|
|
133
|
Tue Jun 27 12:09:37 2023 |
Shane | Update | Cleanroom | cleanroom 5 zone particle count measurement |
Attached is 5 zone measurement for cleanroom particulate count. Zone 3 (in front of vacuum chamber) higher than usual, likely due to recent vac work. Slightly above ISO class 5 standard in 1.0 micron range, measuring 997 particles/cubic meter while ISO standard is 832 particles/cubic meter in this range.
Zero count test on particle counter performed prior to today's measurement. |
Attachment 1: 23.png
|
|
132
|
Fri Jun 23 15:47:06 2023 |
Pamella | Update | FLIR | Collecting data - Moving horizontal and vertical on screen. |
[Pamella]
- 02:09 pm: Turned on the device (current on)
- 02:42 pm: Started taking snap on position one (Reference point: 0,-0.062). Parameters:0.10A,1.5V,41.5C
- I took multiplier snap on the same position for compare after on data analyzes. I just wanted one/two minute break between the snaps. I did that same for every position.
- 02:55 pm: Started taking snap on position two (Reference point:-0.10,-0.062 ). Parameters: 0.10A,1.5v,43 C
- 03:01 pm: Started taking snap on position three (Reference point:0.05 ,-0.062). Parameters: 0.1A,1.4V,42.8C
- 03:07 pm: Started taking snap on position four (Reference point: 0.05,0.045). Parameters:0.10A,1.5V,43.6 C
- 03:15 pm: Started taking snap on position five (Reference point: 0,0.045). Parameters:0.10A, 1.4V, 44.1C
- 03:22 pm: Started taking snap on position six (Reference point: 0,0.045). Parameters: 0.10A,1.4V,43.3 C
- We can see in the photos attached below than have some differences between every position so I should be starting analyzes on that.
|
Attachment 1: AcquisitionImage(Jun-23-2023_14_42).jpg
|
|
Attachment 2: AcquisitionImage(Jun-23-2023_14_57).jpg
|
|
Attachment 3: AcquisitionImage(Jun-23-2023_15_01).jpg
|
|
Attachment 4: AcquisitionImage(Jun-23-2023_15_07)_(3).jpg
|
|
Attachment 5: AcquisitionImage(Jun-23-2023_15_15).jpg
|
|
Attachment 6: AcquisitionImage(Jun-23-2023_15_22).jpg
|
|
131
|
Thu Jun 22 13:58:00 2023 |
Pamella, Julian and Shane | Update | Cleanroom | Cleaning and Particle Count |
[Pamella, Shane, and Julian]
cleaning cleanroom and particle count
-
12:00 pm: started particle count
- Zone 3
- 0.3u: 3533
- 0.5u: 540
- 1.0u: 166
- Zone 4
- 0.3u: 290
- 0.5u: 124
- 1.0u: 41
12:31 pm: Started checking the surface inside the cleanroom and began surface wipedown
12:50 pm: started vacuuming the floor
1:05 pm: Finished vacuuming floor
1:09 pm: Started mopping the floor
1:21 pm: Finished mopping the floor
1:22 pm: Started cleaning the baskets
1:25 pm: Started mopping with IPA wipes
1:39 pm: Finished mopping with IPA wipes
1:41 pm: Changed sticky floor mats
1:45 pm: Started particle count
- Zone 3
- 0.3u: 2327
- 0.5u: 581
- 1.0u: 207
Zone 4
- 0.3u: 1662
- 0.5u: 374
- 1.0u: 290
|
130
|
Wed Jun 21 20:25:05 2023 |
Cao | Infrastructure | VAC | Vacuum chamber bake attempt 1 |
TL;DR:
We are not yet able to bake the chamber at 150 deg C due to some current limit, most likely caused power supply switching off. Also, smoke was observed at some insulation points, mainly in the small arm sections, This is likely because the insulation does not fit well and the velcro came into direct contact with heat tape. Some Velcro (made from Nylon/ Polyester) has lower melting temperature point (in 90-120 deg C range)
Full version:
20 June 23:
- Turn off heater (short term testing) Close valves to RGA line and main volume. Pressure (Torr) readout:
- Gauge 1 (main volume): 3.43E-6
- Gauge 2 (RGA line): 2.61E-6
- Gauge 2 (pump line): 3.8E-4
- Turn off turbo pump, let vacuum line vent
- Connect high temperature control unit to main power, power up, set setpoints:
- Temperature setpoint: 150 deg C
- High temperature setpoint (to switch off) : 175 deg C
- Hysteresis: 10 dec C
- change setpoint of PID control unit to 150 dec C, with high alarm set at 165 deg C
- Connect power output of high temperature control units to PID temperature control units, ensuring both are off
- Turn off scroll pump
- Replace Pirani gauge in front of turbo pump with blanks (see image)
- Pump the vacuum line back down
- Open up valves and wait until pressure of full system drop back down to 1E-6
- Install the high temperature controller thermocouples onto the chamber (see images):
- One thermocouple is installed on the other side of the cross before the turbo pump
- One thermocouple is installed on the main volume next to the PID controller RTD
- Attempt to remove electronic box and magnetic shield of full range gauges:
- Electronic box is easily removed with an Allen key
- Magnetic shield cannot be removed since the gap between the vacuum flange and the gauge bolt is too short for a spanner to go in. This is mainly due to the bolt washers are in the way (see images)
- To remove the magnetic shield, the main volume has to be vented and the gauges need to be readjusted.
- Attempt to power heaters (but only heat to 80 deg C):
- Leaving the gauges intact, the high temperature controller + PID controller are turned on to test heating the chamber
- At this point, both of the high temperature controllers are connected to the same power strip (Vacuum chamber end of the table)
- After heating up to 65-70 deg C range, the powers turned off on both controllers + the lights on one end of the table
- Upon inspection, the power strip has turned itself off, I don't know what the model of the power strip but we should check its current limit
- For a quick test, I connect one of the two heater controlling system to the power board on the work desk while leaving the other running off the same power strip: The heaters appeared to be function ok and able to reach 80 deg C, at which point I turned it off and left for the day
21 June 23:
The goals of today was to remove the electronic boxes and magnetic shields on full range gauges to enable high temperature bakeout
- Upon returning to the lab, the gauges readout of vacuum pressures were:
- Gauge 1 (main volume): 3.31E-7
- Gauge 2 (RGA line): 3.40E-7
- Venting the both main volume and RGA line
- Remove the two full range gauges from their flanges
- Electronic boxes and magnetic shields were removed according to the gauge manuals (see images)
-
- Mount the gauges (with only its probing volume) back onto their respective flanges, ensuring that the flange washers do not block access to the magnetic shield screws
- Only remount magnetic shield + electronic box for one gauge (gauge 2: RGA line) for monitoring chamber pressure
- Turn on scroll pump and let the chamber pump down
- Rearrange heater controller connections while waiting for pumping down:
- Controllers for bottom + pump & RGA line heaters remain the same: connected to power strip on vacuum end of the table
- Controllers for lid + upper chamber main volume: connected to power strip on clean&bake end of the table
- Once the pressure readout by gauge 2 reached 3 Torr, the turbo pump was turned on and left to run for 45 minutes
- Upon returning to the lab, pressure on gauge 2 read 5E-6 Torr and was still decreasing
- Disconnect the ethernet cable to gauge 2, remove its electronic box and magnetic shield
- Turn on heater controller units and let them drive the heaters to get up 150 deg C
- At 95 degree range, I could see smoke at some locations, mainly the RGA and pump lines where the insulation do not fit properly and the velcros are likely to be overheated
- Upon reaching 90 degree range (measured by sensors), the powers turned off on both sides of table (including heaters, lights and scroll pump)
- Turn off both heaters controllers and unplug them from power strip. Attempt to switch the power strip back on but nothing happened
- It is now not the power strips problem and must be further down the line from outside the tent, most likely the power supply that these strips connected to: What is the power supply model + current limit?
- The heater controllers left unplugged, I temporarily plugged scroll pump to the desk power strip so it can still run
|
Attachment 1: Pirani_gauge_blankReplacement.jpg
|
|
Attachment 2: ThermoCouple1.jpg
|
|
Attachment 3: ThermoCouple2.jpg
|
|
Attachment 4: Gauge1_magneticShield_screw.jpg
|
|
Attachment 5: Gauge2_magneticShield_screw.jpg
|
|
Attachment 6: Fullrange_gauges_components.jpg
|
|
129
|
Tue Jun 20 22:14:24 2023 |
Pamella, Cao | Infrastructure | VAC | Short term testing of vacuum heater controller units |
[Pamella, Cao]
Fuse replacement
- Replace blown 10A fuse in ucontroller outside cleanroom
- Replace 10 A fuse in main power connection slot of the controller unit inside cleanroom
- Pamella wiped down unit outside cleanroom.
- Controller units turned on and temperature setpoint set to be 80 deg C
- Temperature settle in approx. 15 minutes(as recorded by the RTD). No problems with fuses observed
- Recording of pressure gauges (in Torr) :
- Before turning heater on :
- Gauge 1(main chamber): 3.73E-7
- Gauge 2(RGA line): 3.65E-7
- Gauge 3(Pump line): 3.8E-4
- After 15 minutes :
- Gauge 1(main chamber): 7.07E-7
- Gauge 2(RGA line): 6.12E-7
- Gauge 3(Pump line): 3.8E-4
- Reduce setpoint temperature to 60 deg C due to Pinrani gauge (Gauge 3) temperature limit
- Upon returned to lab to reduce temperature (35 minutes after turned on):
- Gauge 1(main chamber): 1.22E-6
- Gauge 2(RGA line): 9.98E-7
- Gauge 3(Pump line): 3.8E-4
- Once temperature has settled to 60 C (approx 20 mins after changing setpoint), pressure readout showed:
- Gauge 1(main chamber): 1.37E-6
- Gauge 2(RGA line): 1.10E-6
- Gauge 3(Pump line): 3.8E-4
- Heater left on for the whole afternoon, pressure readout upon returning to lab at 5:30 pm:
- Gauge 1(main chamber): 3.43E-6
- Gauge 2(RGA line): 2.61E-6
- Gauge 3(Pump line): 3.8E-4
|
128
|
Tue Jun 20 17:28:23 2023 |
Pamella | Update | Electronics | Heater system parts - Wiped |
[Pamella]
Wiping the heater system parts.
04:37 pm: Started wiping the electronic device part for the heater system (HL101 Series Digital Benchtop temperature limit control).
05:19 pm: Finished wiping the parts to the heater system (HL101 Series Digital Benchtop temperature limit control). I wiped the HL101 Series Digital Benchtop temperature limit control and I didn't bagged and tagged because we should install that soon.
05:23 pm: I putted heater electronic device inside the cleanroom without the bag. Also the electronic device is near to the vacuum chamber and the other parts to heater system.
I attached the photo below. |
Attachment 1: IMG_7696.jpg
|
|
127
|
Mon Jun 19 11:20:57 2023 |
Pamella | Update | FLIR | FLIR - Fixed some problems |
[Pamella]
- 08:59 am: Turned on the electronic device (current on) for started taking data.
- 09:37 am: Tried understanding the error in the focal point. I realized the pillars was in the wrong place and because of that we got problems to keep the reflector in the correct position to FLIR focus.
- 09:58 am: Started checking the temperature and the parameters.Changed the pillars to the original position (0.5645m) just for checking with the problem was the pillar in the wrong place.
- 10:06 am: Changed the reflector to point (0.3282m) and now in the correct position for the pillars. Started take snap and collecting data. I moved up and down the reflector for got data to compare later.
- 10:37 am: Used the closest point possible for the reflector in front of the FLIR camera with the correct spot for the pillars.(0.2032m)
- 11:00 am: Started taking snap after kept the current on for a few hours. Parameters: Current: 0.10A , Volt: 1.3V and Temperature: 41.9 C.
- I attached below the snap in the most close point possible, now i can see a better photo and I think a fixed the problem about the focal point in the reflector for have more uniformity between the triangles, isn't perfect yet but now is just some adjustments. Furthermore after that I should be change the reflector position and also the optical focus distance in the FLIR camera and try use the black wall.
|
Attachment 1: AcquisitionImage(Jun-19-2023_11_00).jpg
|
|
126
|
Fri Jun 16 17:40:28 2023 |
Aiden | Update | Clean & Bake | Clean and Bake Batch 14 |
Cleaned and Baked the new and 2.75" copper gaskets for the vacuum system. Cleaned them with liquinox in the ultra sonic washer for 10 minutes. Then dried them with nitrogen. Then put the copper parts into the oven for the following steps; 1. Ramp to 100 degC in 15 minutes 2. Dwell at 100 degC for 30 minutes 3. Ramp to 175 degC in 30 minutes 4. Dwell at 175 degC for 24 hours 5. Turn off
Also bagged and tagged the parts from Batch 13 and placed them into the clean room on the computer table. |
Attachment 1: IMG_4441.jpg
|
|
Attachment 2: IMG_4440.jpg
|
|
125
|
Fri Jun 16 16:17:13 2023 |
Pamella | Update | FLIR | FLIR - Change the position |
[Pamella]
Today I change the distance between the FLIR camera and reflector (3D-Mask with mirrors and light). Now the distance is 0.3282 m.
- Note: In this distance is possible move up and down the reflector and take data to compare.
- The focal point inside the reflector keeping like little problem, every time I tried adjust this I got some triangles is not with "perfect emission" (looks like different than the others). Also if I move up or down the focal point inside the reflector have some issues as well.Therefore I am working on that.
|
Attachment 1: IMG-7637.jpg
|
|
124
|
Wed Jun 14 15:35:36 2023 |
Pamella | Update | VAC | Heating system installation |
[Pamella and Cao]
Heating system installation - Second day.
- Today we kept installing the equipment for the heating system.
- First: Started installing the two heating cable around the chamber vacuum, the arms and covered it with aluminum tape.
- Second: Started installing the insulation stuff around the vacuum chamber and around the connections points (the arms) in the vacuum chamber.
- Third:Started installing the heater system (electronic device) and tried testing.
-
Note: The around part of the chamber vacuum was difficult to cover, so we spent a little time on. Also one heater system electronic device wasn't working because one fuse is burned so we could not finished this part and we need wait for a new one to replace and working on it.
|
Attachment 1: heater_equipment_install.jpg
|
|
123
|
Tue Jun 13 21:33:46 2023 |
Pamella | Update | General | New cabinet for PPI |
[Pamella and Dr.Richardson]
Dr. Richardson installed the new cabinet outside the room for the PPI equipments, and then I wiped all surfaces inside and outside of the new cabinet.
Dr.Richardson and I have finished organizing the PPI within the new cabinet. Also we have new supplies of gloves, and will likely have more supplies for other PPIs soon. |
122
|
Tue Jun 13 21:08:46 2023 |
Pamella | Infrastructure | VAC | Heater system - Installation |
[Pamella, Cao and Jon]
Heating system installation
- Today we started installing the equipments for the heating system.
- First: Started installing the heating cable on the top lid and covered it with aluminum tape.
- Second: Started installing the insulation cover on top of the chamber lid.
- Third:Started installing the heating cable from under the vacuum chamber and covered with aluminum tape.
- Forth: Started installing the insulation cover under the vacuum chamber
- Note: The under part of the chamber vacuum was very difficult to cover, so we spent a little time on it and we couldn't finish the whole installation today. So tomorrow we should be able to keep doing the installation.
|
Attachment 1: IMG_7563.jpeg
|
|
Attachment 2: IMG_7561.jpeg
|
|
121
|
Tue Jun 13 13:25:05 2023 |
Aiden | Summary | Clean & Bake | Clean and Bake Batch 13 |
Cleaned and Baked the new 1.33" and 2.75" blanks for the vacuum system. Cleaned them with liquinox in the ultra sonic washer for 10 minutes. Then dried them with nitrogen. Then put the two stainless steel parts into the oven for the following steps;
1. Ramp to 100 degC in 15 minutes
2. Dwell at 100 degC for 30 minutes
3. Ramp to 200 degC in 30 minutes
4. Dwell at 200 degC for 48 hours
5. Turn off |
120
|
Tue Jun 13 10:28:50 2023 |
Pamella | Update | General | Wiped and bagged the heating and cords. |
[Pamella]
- 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. |
Attachment 1: heater_cords_wiped.jpg
|
|
119
|
Mon Jun 12 18:52:00 2023 |
Pamella | Update | General | Heater system parts - Wiped and bagged |
[Pamella]
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.
|
Attachment 1: heater_equipment_wiped.jpg
|
|
118
|
Mon Jun 12 12:15:10 2023 |
Pamella | Update | FLIR | FLIR- Take data in the closest point. |
[Pamella]
- 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).
|
Attachment 1: AcquisitionImage(Jun-12-2023_12_04).jpg
|
|
117
|
Thu Jun 8 14:51:58 2023 |
Pamella | Update | FLIR | FLIR- Distance |
[Pamella, Tyler]
- 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.
|
Attachment 1: AcquisitionImage(Jun-08-2023_14_33).jpg
|
|
Attachment 2: thumbnail_IMG_7441.jpg
|
|
116
|
Tue Jun 6 16:15:09 2023 |
Peter | Update | VLC Update | Launch Optics for Visible Light Cavity |
I assembled the first few components of the launch optics for the visible light cavity. Below is an image of the current table configuration, and the image is how the cavity will be oriented on the table. |
Attachment 1: IMG-0882.jpg
|
|
Attachment 2: IMG-0883.jpg
|
|
115
|
Tue Jun 6 16:04:46 2023 |
Aiden | Update | General | Water |
Aiden went and refilled the de-ionized water to continue clean and bake batches. |
114
|
Fri Jun 2 14:28:40 2023 |
Pamella | Update | FLIR | FLIR project - Test without the black wall. |
[Pamella]
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).
|
Attachment 1: 1Axis_y___tests.jpg
|
|
113
|
Thu Jun 1 14:41:36 2023 |
Pamella | Update | FLIR | FLIR project - Test without the black wall. |
[Pamella]
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.
|
Attachment 1: thumbnail_IMG_7316.jpg
|
|
Attachment 2: AcquisitionImage(Jun-01-2023_14_14).jpg
|
|
Attachment 3: thumbnail_IMG_7320.jpg
|
|
112
|
Wed May 31 16:55:55 2023 |
Pamella | Update | FLIR | FLIR- Focus distance |
[Pamella and Tyler]
- 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.
|
Attachment 1: AcquisitionImage(May-31-2023_16_40).jpg
|
|
Attachment 2: thumbnail_IMG_7310.jpg
|
|
111
|
Wed May 31 16:18:41 2023 |
Aiden | Summary | General | Mock FROSTI |
Finished assembly on the Mock FROSTI so it is ready for the fit test at LIGO lab. |
Attachment 1: IMG_4394.jpg
|
|
110
|
Wed May 31 12:16:28 2023 |
Shane | Update | Cleanroom | cleanroom particle counts (full 5 zone measurement) |
Attached is the full 5 zone particle measurement for the cleanroom after this week's cleaning, 5/31/23. |
Attachment 1: 23.png
|
|
109
|
Wed May 31 11:42:16 2023 |
Pamella, Julian and Shane | Update | General | Cleaning room and particle count |
[Pamella, Shane and Julian]
Cleaning room and particle count
- 09:58 am: Started the particle count
- Zone 3:
- 0.3u : 1,995
- 0.5u : 540
- 1.0u : 0
- Zone 4:
- 0.3u : 124
- 0.5u : 0
- 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.
- Zone 3:
- 0.3u : 2,951
- 0.5u : 872
- 1.0u : 207
- Zone 4:
- 0.3u : 374
- 0.5u : 83
- 1.0u : 0
|
108
|
Tue May 30 14:51:27 2023 |
Pamella | Update | FLIR | New 3D mask - Bigger triangles shapes. |
[Pamella]
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.
|
Attachment 1: AcquisitionImage(May-30-2023_14_38).jpg
|
|
Attachment 2: thumbnail_IMG-7303.jpg
|
|
107
|
Wed May 24 14:28:26 2023 |
Peter | Update | VLC Electronics | Laser intensity/polarization drift measurements |
I went in and took polarization drift data for 16 hours. The run started at 6:08pm and finished at 9:15am the next day. The four plots below are the same plots shown for the 2 hour collection and previous trials, except they extend to 16 hours. The only one that is different is the Power vs. Time graph. This is a graph of the actual incoming power of the laser (as opposed to the signal voltage that the PDA's output into the red pitaya). This was done using the calibration factors of the respective PDA's and as we can see, since there is a difference in the calibration factors between detectors, there is a difference in the power that's coupled into S and P polarization. |
Attachment 1: Time_Series_Trial_7_16hrs.png
|
|
Attachment 2: Power_vs_Time_16hrs.png
|
|
Attachment 3: Polar_angle_vs_time_16hrs.png
|
|
Attachment 4: Rel_Intens_vs_time_16hrs.png
|
|
106
|
Wed May 24 14:06:27 2023 |
Pamella | Update | FLIR | FLIR project - Tests |
[Pamella]
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.
|
Attachment 1: AcquisitionImage(May-24-2023_10_50).jpg
|
|
Attachment 2: thumbnail_IMG-7146.jpg
|
|
Attachment 3: AcquisitionImage(May-24-2023_14_30).jpg
|
|
105
|
Tue May 23 16:52:56 2023 |
Pamella | Update | FLIR | FLIR project - Reinstalling the mask and Reconfiguration FLIR position. |
[Pamella]
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.
|
Attachment 1: AcquisitionImage(May-23-2023_16_36).jpg
|
|
Attachment 2: Reconfiguration.jpg
|
|
104
|
Mon May 22 17:08:50 2023 |
Pamella | Update | FLIR | FLIR project - Installing the mask. |
[Pamella]
- 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:
- Change the FLIR camera position for the other side on the table.
- Start the test without the black wall.
- Try a better tool to cut the triangles inside the 3D-mask.
|
Attachment 1: Mask.jpg
|
|
Attachment 2: AcquisitionImage(May-22-2023_16_35).jpg
|
|
Attachment 3: AcquisitionImage(May-22-2023_16_01).jpg
|
|
102
|
Mon May 22 16:43:28 2023 |
Peter | Update | VLC Electronics | Laser intensity/polarization drift measurements |
In order to fully analyze the polarization data taken last Thursday, I needed to convert the signal output (which is in volts) to power (units of watts). I used the power meter to accomplish this. Keeping the exact same configuration of PD's and beam splitting, opened the red pitaya's oscilloscope package. I then took the power meter, and held it in front of the PD to measure the amount of Watts at each PD. I then wrote down the corresponding voltage being seen in the red pitaya. I took 5 sets of measurements for each PD to get experimental accuracy. I then used a simple y = mx + b fit to find out the constant m that converts the input wattage into voltage. For the s polarization, the conversion factor is 0.83. For the p polarization, the conversion factor is 1.12. I then used this data to plot polarization angle as a function of time, and the relative intensity drift as a function of time. The plots are shown below. The physical meaning of the polarization angle is shown in the unit circle diagram below, in which P is the total power. |
Attachment 1: S-P_Polarization_Diagram.svg
|
|
Attachment 2: Polar_angle_vs_time.png
|
|
Attachment 3: Rel_Intens_vs_time.png
|
|
101
|
Thu May 18 14:07:08 2023 |
Peter | Update | VLC Update | 532nm Intensity Measurement |
I figured out a method in which to capture power measurements including the initial seconds in which the beam is first turned on. I first clear and restart the kernel of the python notebook. Then I run the command to connect the red pitaya oscilloscope package to the input data being taken in both channels. To my understanding, this allows for data acquisition as the code compiles. I then started looping the 1.074s trigger bunches, and then roughly 2 seconds after I ran that command, I went and turned on the laser. The first plot shown is a 2 minute practice trial of me trying this technique to make sure that the python package was correctly registering the input of the red pitaya. It is clear that initially the laser is off, and then as I turned it on, the voltage in each channel spikes, which is compelling evidence that the code is working. I then set the data collection to be 7518 seconds (7000 loops), which is about 2 hours and 5 minutes. I repeated the same technique as for the first plot, only changing the amount of time I collected data. The second plot shown here is the voltage being read in each channel as a function of time. As we can see, over a period of hours, the intensity drifts quite dramatically for the first several minutes, and then begins to stabilize slightly. However, there are still some strong sudden fluctuations in each channel. |
Attachment 1: Time_Series_Trial_4.png
|
|
Attachment 2: Time_Series_Trial_5_2hrs.png
|
|
100
|
Wed May 17 12:18:08 2023 |
Pamella, Julian and Shane | Update | General | Cleaning room and particle count |
[Pamella, Julian and Shane]
Particle count:
- 10 am: Started particle count
- Zone 3 :
- 0.3u: 1288
- 0.5u: 332
- 1.0u: 124
- 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.
- Zone 3 :
- 0.3u: 3782
- 0.5u: 706
- 1.0u: 207
- Zone 4 :
- 0.3u: 374
- 0.5u: 83
- 1.0u: 83
|
99
|
Tue May 16 11:56:33 2023 |
Peter | Update | VLC Electronics | 532nm Intensity Measurement |
With the configuration the exact same as before, I used the Jupyter notebook in the red pitaya's development package to collect data from both input channels. Last week, I was able to take data, yet only for a very short period of time, and I did not know how to change it. I went online to the red pitaya's user manual to figure out how to change the sampling period for longer. The link to the page is here: https://redpitaya.readthedocs.io/en/latest/appsFeatures/examples/acqRF-samp-and-dec.html#s-rate-and-dec Though I now know how to change the period of time for which data is taken, the maximum amount of time is still only about 8 seconds. So with help from Cao, we looped over the data taking samples, and got a mean value for each iteration. We then put all those mean values in an array, and plotted it. Below, we see a plot of both the S and P polarizations, and a sum of both of them. As seen in the graph, I have set the time to be able to take data for almost 2 minutes. There is some slight drift in the respective intensities. The next steps I believe are to convert the units into watts, and take data for longer periods of time. |
Attachment 1: Time_Series_Trial_3.png
|
|
98
|
Sun May 14 15:50:48 2023 |
Cao | Infrastructure | Computers | High resolution display of logrus machine |
[Cao]
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.
|
97
|
Fri May 12 20:28:34 2023 |
Aiden, Cao | Physics | VAC | Vacuum chamber Helium leak test |
[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
After finishing the Helium 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 |
Attachment 1: PXL_20230512_211717602.jpg
|
|
Attachment 2: ArLeak_230512.png
|
|
96
|
Wed May 10 10:49:34 2023 |
Aiden | Update | General | RGA Software |
[Aiden, Cao]
Went over how to use the RGA software, how to change the graph units, scaling and mass detection. Also went over how to remove the RGA from the vacuum system as well as procedure for turning it on. |
95
|
Tue May 9 20:55:12 2023 |
Jon | Infrastructure | VAC | Calibrated Ar leak rate |
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. |
Attachment 1: VTI-Calibrated-Ar-Leak.jpeg
|
|
94
|
Tue May 9 15:49:20 2023 |
Jon | Infrastructure | VAC | Permanent cable routing |
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:
- Close the 4.5" gate valve, 2.75" gate valve, and the bypass line angle valve.
- Shut down the turbo pump.
- Shut down the scroll pump.
- Unplug the scroll pump and install the extension cable.
- Power on the scroll pump.
- Power on the turbo pump.
- 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. |
93
|
Mon May 8 12:00:03 2023 |
Pamella, Shane, Julian | Update | General | Cleanroom particle counts and cleaning the cleanroom. |
[Pamella,Julian, Shane]
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
|
92
|
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 our laser has a slightly elliptical polarization. |
Attachment 1: graphs(3).jpg
|
|
Attachment 2: graphs(2).jpg
|
|
91
|
Wed May 3 19:03:47 2023 |
Julian,Pamella and Cao | Physics | VAC | Modify vacuum asssembly and install RGA |
[Pamella, Julian, Cao]
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.
- Zone 3 :
- 0.3 u: 2244
- 0.5 u: 997
- 1.0 u: 207
- 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.
- Channel 1 : 1.06E-5 mbar
- Channel 2 :8.89E-6 mbar
- Channel 3 :5.0E-4 mbar
- 05:59 pm: Test pressure readout from the gauges.
- Channel 1: 9.09E-6 mbar
- Channel 2: 7.75E-6 mbar
- Channel 3: 5.0E-4 mbar
|
Attachment 1: vaccum_chamber_re-configuration.jpg
|
|
90
|
Tue May 2 17:03:14 2023 |
Jon, Cao | Physics | VAC | First pump-down test of vacuum chamber |
[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
While preparing for our first pump-down, we notices that RGA pump line gate valve, at its fully closed position, is higher than the height of the chamber lid. The full range gauge attached to the RGA line, while not that high, can also cause obstruction during removal/ installation of the vacuum lid. The calibrated leak, eventhough is now running within the perimeter of the optical table, it stills introduce weak points that are susceptible to damage if personnel installing chamber lid may lean onto it. Thus we made a few suggested modification to the vacuum chamber assembly:
- 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
- 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 )
- 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 )
- 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
- 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
- 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
- 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"
- 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 )
- Press "START" on the controller to start the turbo pump
- 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
- 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
|
Attachment 1: PXL_20230502_203343616.jpg
|
|
Attachment 2: PXL_20230502_210234897.MP.jpg
|
|
89
|
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 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
|
|
88
|
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 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
|
|
87
|
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 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
- : Zone 3
- 0.3 um: 1413
- 0.5 um: 872
- 1 um: 623
- : 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
|
|
86
|
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 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
|