ID |
Date |
Author |
Type |
Category |
Subject |
533
|
Wed Mar 5 12:16:28 2025 |
Shane | Update | CDS | Vac system communications update |
[Shane, Jon]
Update on the serial interfacing with the vacuum system: both turbo pumps are now able to successfully communicate through the code. The older pump, for unknown reasons, required a newer version of the communication syntax (despite the newer, small pump being able to communicate fine with the old communication format). We have also confirmed that the newer pump works with this new format as well. Next step is interfacing the pressure gauge.
|
518
|
Wed Feb 19 13:44:48 2025 |
Shane | Update | CDS | Vac serial interfacing update |
[Jon, Shane]
Debugging update for vac system serial communications: we were able to successfully connect the smaller turbo pump to the Varian (manufacturer) software today by plugging the controller db9 directly into spica, and verified that the pump was able to send and receive information. Still no success on communication with the larger pump via python serial code, though. Issue potentially lies in the pinout mapping of the connectors, as the pinouts we'd been using work successfully for the small pump which only requires 3 connections (RXD, TXD, GND), but the large pump may require more. Tried to test this on the big pump by keeping the pinout setup for the small pump, and incrementally adding the remaining 6 connections on a one to one scale (Pin 1 matched to Pin 1, etc) between the controller DB9 and the field DB9 connected to the IOLAN ethernet cable. After each new connection was added, I retried running the serial connection code. None of the additional connections yielded any results, and the large pump remained unable to connect through the code. Next step is further looking into documentation on the pinouts to see if the large pump requires a different connection setup than the small pump.
|
484
|
Wed Dec 4 16:01:23 2024 |
Shane | Update | CDS | Vac serial interfacing troubleshooting update |
Update on the issue with serial interfacing for the TV 551 turbo pump: Tried a new test today, to see if the commands being sent to the controller were actually getting through at all, since we know that no response is getting back to us. To test this, I sent the start/stop command for the pump, disconnected the serial connection and instead connected the controller to spica so I could run the manufacturer's software, and used the manufacturer's sotware to check the pump status manually. After trying a few variations of this test, during which the pump status did not change at all from 'normal' (meaning the stop command being sent was not actually received), we've concluded that the commands being sent to the pump with the serial comms code are not being received. Further troubleshooting needed. |
293
|
Sun Dec 17 19:43:18 2023 |
Aiden | Update | VAC | Vac Heating Update |
[Aiden]
I measured the temperature of the flanges where some of the electronics will go and I found that the RGA flange was at 55C and the two full range gauges were at 65C. I also stopped bake 9 to cool down for measurement. |
242
|
Mon Oct 23 07:28:57 2023 |
Peter | Update | VLC Update | VLC Mode Matching |
I have attached a pdf with slides of my latest updates. |
256
|
Mon Nov 6 11:31:25 2023 |
Peter | Update | VLC Update | VLC Mode Matching |
See Update Attached |
263
|
Mon Nov 13 06:15:45 2023 |
Peter | Update | VLC Update | VLC Mode Matching |
Weekly Updates Attached in pdf |
221
|
Thu Sep 7 19:24:25 2023 |
Peter | Update | VLC Update | VLC Launch Chain |
The launch optics up to the Faraday Isolator have been added to the breadboard. In the first image, the optics are (from L to R) the stirring mirror, half-wave plate, polarizing cube, 100mm f lens, electro-optical modulator, Faraday isolator, 50mm lens (not part of final design), stirring mirror (not part of final design) |
234
|
Mon Oct 9 11:06:17 2023 |
Peter | Update | VLC Update | VLC Launch Chain |
Implemented the new stage for the EOM. Took power data at different positions in the launch chain. Beam waist: 0.066mm (beam waist is inside EOM). Power before EOM: 0.473mW. Power after EOM: 0.452mW. Power after Faraday Isolator: 0.415mW. Might need to adjust better to configure for clipping losses. Images of setup are attached below. |
304
|
Tue Jan 16 10:01:21 2024 |
Peter | Update | VLC Update | VLC Faraday Isolator and Mode Matching |
Attached is a PDF of my weekly updates. |
288
|
Fri Dec 8 11:15:21 2023 |
Peter | Update | VLC Update | VLC Assembly |
The optics of the visible light cavity have been assembled. The mode matching telescope is folded through the two stirring mirrors at the corners shown in the image below, with the first lens (f=0.2m) before the first stirring mirror, and the second lens (f=0.5m) between the two stirring mirrors. The distance from the cavity to the edge of the table is 14cm. There is still some work to be done on the alignment of the cavity, as the beam does not seem to be completely centered on the two mirrors. |
360
|
Mon Apr 15 11:51:03 2024 |
Peter | Update | VLC Update | VLC |
An update on the VLC project is attached below: |
368
|
Mon May 13 14:53:29 2024 |
Peter | Update | VLC Update | VLC |
VLC Update WEEK 7 attached below |
301
|
Tue Jan 9 16:35:09 2024 |
Aiden | Update | VAC | VAC System Leak and Heating |
[Luis, Luke, Aiden]
Leak tested each flange and weld and only found two flanges to have noticeable leaks with the electron multiplier on. These were the turbo pump flange and the RGA flange that connects to the cross. The RGA one is rather new as it has not had a measurable leak before and it was around 2 e-8. We then applied the new sealant to these two flanges as directed by the instructions on the packaging.
Then after waiting a few minutes for the sealant to dry we started the bake. We got the PID controllers set to 120 after many steps and we checked the temperature of the flanges throughout this increase. The flanges never reached 70C with the electronics still left on it. The RGA was left on as well. |
150
|
Fri Jul 7 15:11:39 2023 |
Aiden | Update | VAC | VAC System Heating Update |
The temperature of the flange connecting to the turbo pump after reaching equilibrium is 74 degC. This means that it is safe to proceed with raising the temperature from 120 degC to 150 degC.
Raised the set temperature of the chamber from 120 degC to 150 degC in 15 deg steps.
|
152
|
Mon Jul 10 13:23:23 2023 |
Aiden | Update | VAC | VAC System Heating Update |
Checked on the system today.
The flange on the turbo pump has reached an equilibrium temperature of 87 degC when set at 150 degC. While the main body of the chamber has reached an equilibrium temperature of 142 degC.
|
153
|
Thu Jul 13 14:56:43 2023 |
Aiden | Update | VAC | VAC System Heating Update |
Checked on the vacuum system today to change the PID controls back to their default values in order to try and get the temperature of the cross in front of the turbo pump higher. Currently it is sitting at 90 degC before changing the controls. While the main body is at 146 degC.
Will update again tomorrow on new equilibrium with the default PID settings.
|
156
|
Fri Jul 14 14:37:25 2023 |
Aiden | Update | VAC | VAC System Heating Update |
Checked on the vacuum system and it looks like it will either need to be increased in temperature or baked for a longer time. The main body is at 146C while the cross is at 91C.
|
160
|
Mon Jul 17 13:50:41 2023 |
Aiden | Update | VAC | VAC System Heating Update |
Started to cool down the chamber today. Final temperature readings of the chamber were 146C and 91C for the body and cross respectively.
|
161
|
Mon Jul 17 14:01:41 2023 |
Aiden | Update | VAC | VAC System Heating Update |
The insulation on the lid of the vacuum chamber has some discoloration and it may be wise to place a sensor closer to this spot in future bakes.
|
188
|
Wed Aug 2 17:02:38 2023 |
Aiden | Update | VAC | VAC System Heating Update |
Moved the temperature sensor on the PID controller to one of the switch backs on the lid.
Also started the next bake with both PID controllers set to 150 degC. When leaving the temperature sensors above the chamber read 119 C and 83 C. These sensors are on the chamber wall and flange in front of the turbo pump respectively.
|
189
|
Thu Aug 3 16:00:25 2023 |
Aiden | Update | VAC | VAC System Heating Update |
Check on the temperature of the bake today to see the equilibrium temperatures. With both of the PID controllers set to 150 C, the temperature sensors for the wall of the chamber and the flange in front of the turbo pump read: 125 C and 90 C respectively. At these temperatures the bake would need to last at least a week unless the temperature were to be increased. |
192
|
Fri Aug 4 15:21:33 2023 |
Aiden | Update | VAC | VAC System Heating Update |
Checked on Bake 3 today and the temperature sensors read 126 C and 91 C for the chamber barrel and turbo pump flange respectively. These were reached while the PID controllers were set to 150 C. |
201
|
Thu Aug 10 14:36:00 2023 |
Aiden | Update | VAC | VAC System Heating Update |
Came in to install one of the Full range gauges. Checked the temperature first of the cross and it was reading 30 C. After installing the gauge above the RGA line the controller was reading 2E-1 torr. Installed the other full range gauge to confirm this and it also read that pressure. There may be a leak so I will let it sit for a bit and then perform a Helium leak test. |
202
|
Thu Aug 10 15:10:12 2023 |
Jon | Update | VAC | VAC System Heating Update |
I shut down the turbo pump since this is evidently a large leak. We CANNOT turn on the RGA for leak checking with the pressure above 1E-5 Torr.
I think we will have to manually inspect it. The most likely cause would be that the Viton seal around the lid overheated and failed.
Quote: |
Came in to install one of the Full range gauges. Checked the temperature first of the cross and it was reading 30 C. After installing the gauge above the RGA line the controller was reading 2E-1 torr. Installed the other full range gauge to confirm this and it also read that pressure. There may be a leak so I will let it sit for a bit and then perform a Helium leak test. |
|
203
|
Thu Aug 10 18:32:39 2023 |
Aiden | Update | VAC | VAC System Heating Update |
[Dr. Richardson, Aiden]
DO NOT TOUCH ANY VALVES ON THE CHAMBER. THERE IS A PRESSURE DIFFERENTIAL BETWEEN THE RGA LINE, TURBO PUMP LINE AND THE MAIN VOLUME. THE TURBO PUMP WILL BE DESTROYED IF OPENED.
Closed the valves to the turbo pump line and RGA line. Turned the turbo pump back on and saw that the pressure in the RGA Line and Turbo pump line was going down so there was no large leak within that line or with the valves as the main body pressure stayed constant. Then raised the pressure of the main body of the chamber as we suspect the viton o-ring has failed and needs to be changed. The bolts to the lid of the chamber were also removed but the lid was left on.
Then performed a helium leak test on the section of the system that was under vacuum. We found two flanges that had small but significant leaks compared to the others in the lines. The flange connecting the full range gauge to the cross and the flange connecting the stainless steel tube to the valve under the cross. These showed large spikes when sprayed with helium and were then tightened to hopefully fix it. After tightening, the flange under the full range gauge was fixed as the bolts were pretty loose and tightening reduced any spike seen on leak test. The other flange on the SS tube could not be fixed with tightening and it still shows signs of helium leaking through. This flange will need to have its gasket changed to fix this leak. Then left the system where it is in the picture for further changes tomorrow August 11. Again, DO NOT TOUCH THE VALVES ON THE RGA LINE AND TURBO PUMP LINE AS THERE IS A PRESSURE DIFFERENTIAL AND IT WILL DESTROY THE TURBO PUMP IF OPENED.
Note: We also found that the pump under the table had flipped the breaker and needed to be turned back on. This may be something to look into.
|
205
|
Fri Aug 11 18:32:00 2023 |
Aiden | Update | VAC | VAC System Heating Update |
[Dr. Richardson, Aiden] Large Update
Removed most of the insulation on the chamber in order to pull back some of the heater tape to get to the flange connecting the bypass line to the valve under the RGA line. Most of the heater tape on the bottom half of the chamber was pulled off and the rest will need to be removed as well in order to place the start of the heater tape on the barrel of the chamber rather than one of the flanges.
Engaged the valve under the RGA line to prevent it from getting more contaminated. Turned off the turbo pump. Turned off the scroll pump. Let the turbo pump sit for a few minutes to let the fans stop. Then leaked the turbo pump volume by turning the knob slowly on top of the turbo. Then proceeded to unscrew the bypass line after done leaking the volume. Replaced the copper gasket and then proceeded to screw it on while maintaining a circular path to ensure equal pressure on the gasket. BEWARE THAT REUSING SILVER PLATED SCREWS HAS A HIGH CHANCE OF STRIPPING THE SCREW AND WILL RESULT IN A LOT OF WORK TO GET THEM OFF. IT IS RECOMMENDED TO USE NEW SILVER SCREWS. HOWEVER WE HAVE NONE LEFT SO DO NOT TRY TO REUSE ANY SCREWS UNTIL WE HAVE SPARES. We were able to use the remaining two spare screws to tighten the flange to a point where it will not tighten anymore.
Then the lid was removed in order to inspect the inside of the chamber and the Viton O-Ring. The chamber had no physical damage and the viton had some visual damage that may correlate to the failure observed during bake 3. Note that some metal chips were found inside of the o-ring groove and needed to be removed. We changed out the o-ring for a new one and placed the old one inside of an anti static bag labeled "Viton O-Ring". Put the lid back on after inspecting for damage and put the bolts on hand tightened. Started to pump down again by turning on the scroll pump first until full range gauge 1 read below 1 torr and then began to turbo pump. The turbo pump was running for 1.5 hours until it plateaued around 3e-4 torr. We then realized the bolts on the lid needed to be tightened more with a wrench. After further tightening the pressure quickly dropped to 6e-6 torr. In the future the bolts should be tightened with a wrench from the begining.
Then proceeded to Helium leak test every weld, flange, and valve. Two of the flanges needed a little more tightening such as the 2 6" flanges. Other than that the only noticeable leak was from the flange just fixed today, however the leak is 10 times less than how it was yesterday and will most likely not hold the chamber back from reaching low 10e-8 torr pressures.
|
219
|
Fri Sep 1 19:21:19 2023 |
Aiden | Update | VAC | VAC System Heating Update |
Started bake 5 today. This will hopefully be a longer and hotter bake with it lasting 6-7 days at around 150 C. The pressure in the chamber before removing the full range gauge and RGA box was 5.01 e-8 torr. The Argon leak was also left open for this bake to hopefully get rid of particulates on it. I also put the heater tape I removed last time back onto the RGA cross. This made the heating up process take much longer as I had to not increase too much or the cross would heat above 150 C. Hopefully some PID settings in the future will help with this issue. I was able to set the PID controllers to 140 C and after some equilibrium time I should be able to get the temperature up to 150 C. The temperature sensors are reading 150 C and 77 C for the RGA cross and Turbo pump cross respectively. The Turbo pump is drawing the normal .17 Amps at 33 C. |
220
|
Tue Sep 5 16:43:19 2023 |
Aiden | Update | General | VAC System Heating Update |
Checked on bake 5 today after 3 days of equilibrium. The RGA cross is at 106 C and the turbo pump cross is at 74 C. This was reached while the PID controllers were at 140 C. I will now slowly raise the temperature to 150 on the PID controllers and see if the difference in the RGA cross can be reduced. |
222
|
Fri Sep 8 16:10:43 2023 |
Aiden | Update | VAC | VAC System Heating Update |
Turned off the PID controllers to let the chamber cool down. Final temperatures for the RGA cross and Turbo pump cross were 113 C and 80 C respectively. The system should be cool enough to start taking measurements on Monday. |
223
|
Mon Sep 11 16:02:42 2023 |
Aiden | Update | VAC | VAC System Heating Update |
The chamber has cooled down from bake 5 and I took the first set of data. The pressure measured during the RGA measurements reached 9.98 e-8 torr. The data shows that the chamber got dirtier, however this has been the case for every first scan after a bake so I assume there are still some more hydrocarbons to be vacuumed out and that the second scan will most likely give a better idea of where the chamber is at. After turning off the RGA the pressure immediately dropped to 7.4 e-8 torr and was still dropping. |
251
|
Tue Oct 31 19:46:35 2023 |
Aiden | Update | VAC | VAC System Heating Update |
Started bake 7 on Monday but found issues with the heating as the cross in front of the RGA got way too hot too quickly. This resulted in shutdowns of the heater tape while I could still only set the main PID controller for the lid to 75C. Tuesday I moved the PID controller sensors to be on the cross in front of the RGA and on the Reducing nipple. I then placed the alarm sensors onto the lid of the chamber and the barrel. This should hopefully prevent excessive heating on then smaller components. I also started the bake again Tuesday, but only set the temperature to 85C for now and will increase it further tomorrow when I get a good idea of the equilibrium point of the chamber. |
253
|
Wed Nov 1 20:22:07 2023 |
Aiden | Update | VAC | VAC System Heating Update |
Raised the PID controller temperature to 105C today as at that temperature the lid and the barrel temperature sensors were reading around 120C. I will check again tomorrow to see if there is any room for increase after equilibrium. |
280
|
Wed Nov 29 21:13:32 2023 |
Aiden | Update | VAC | VAC System Heating Update |
Started Bake 8 today. Set the PID controllers to 120 C and will check in the morning for equilibrium temperatures for the lid and chamber wall. The chamber pressure was 2.13 e-8 torr before taking off the full range gauges.
After the bake is done on Saturday it will be cooled down and RGA data will be taken to measure the out gassing rate of the stainless steel fasteners inside the chamber. Then on Tuesday we will plan to vent and open the chamber again to put the macor inside and repeat the another low temp bake and then test the macor early in week 11. Then the next material will be the aluminum mounting hardware for mounting the heaters and that should hopefully be done before the end of week 11 so the heaters can be tested afterwards after being cleaned with vector alpha wipes. |
282
|
Thu Nov 30 13:58:18 2023 |
Aiden | Update | VAC | VAC System Heating Update |
[Aiden]
Came into the lab in the morning to check on the chamber heating. I decided to set the PID controllers to 110C rather than 120C as the chamber lid and wall were reading near 140C. With the PID controllers at 110C the chamber lid and wall now read 126C and 132C. Currently the PID controllers are placed on the cross in front of the RGA and the reducing nipple in front of the turbo pump. I believe this is a good equilibrium and will leave the tape on until Saturday when it will be turned off to cool down. |
283
|
Sat Dec 2 18:10:23 2023 |
Aiden | Update | VAC | VAC System Heating Update |
[Aiden]
Turned off the heating tape today in anticipation to take more RGA data on Sunday or Monday morning before the meeting. |
295
|
Mon Dec 18 15:51:49 2023 |
Aiden | Update | VAC | VAC System Heating Update |
After letting the chamber cool down I put the electronics back on and turned the RGA element back on. No data has been taken yet as to let the pressure continue to fall as the RGA is powered. |
190
|
Thu Aug 3 17:47:51 2023 |
Aiden | Update | VAC | VAC Heating System Update |
Did some further testing to determine if it was within reason to increase the temperature of the chamber. I used a thermometer and pulled back some insulation to test many points on the chamber. Mainly focused on the barrel and the bottom lid of the chamber to see if it was possible to increase the temperature of just the PID controller that is powering the bottom half of the chamber.
Found that the barrel of the chamber seems to be hotter than what the sensor is saying, 125 C. Found many points on the barrel that reached 140 C. I believe this is because the sensor is taped on top of the heater tape rather than in between the aluminum and the heater tape.
Also measured many points on the bottom lid as it has the same configuration the top did before it damaged the insulation. It seemed to be consistently at 150 C but I was able to find a couple points that were hotter around 160 C. These hotter spots were most likely the heater folds. There is not much we can do about this as removing the insulation for fixing would required a very invasive procedure to do it safely.
Then moved to the stainless steel tube that connects the RGA and Turbo pump lines. This tube was around 150 C but many points on it were hotter around 160 C. Before another bake I think some of the tape around the tube may need to be pulled back and relocated to avoid damaging insulation while also providing more heat to the main body of the chamber.
Measured a couple more points on the cross that connects the RGA and the full range gauge and found it to be around 130-140 C which means this section could be hotter as the electronics of the full range gauge can reach 150 C.
Over all I believe that the chamber temperature should not be increased in its current state as the bottom lid is a concern with what happened with the top in the second bake. Some optimizations could be made for a fourth bake however. Moving the temperature sensors to be between the heater tape and chamber. Pulling some of the heater tape from the stainless steel tube and relocating it to the main body of the chamber. Moving the PID temperature sensor on the tube to be on the bottom lid or another hotter spot. These are some changes I would make for a fourth bake but maybe this bake could be the last with how the second bake went.
|
195
|
Tue Aug 8 15:31:26 2023 |
Aiden | Update | VAC | VAC Heating System Update |
Vacuum Chamber equilibrium temperature for bake 3 are 126 C and 88 C for the chamber wall and turbo pump flange respectively. There were reached with the PID controllers both being set to 150 C.
Also noticed some discoloration around the port insulation. It could be burned from being exposed to the heater tape directly without insulation or it could be that the insulation, which looks much different, is depositing something around the ports.
The turbo pump overheated and the heating tape had to be turned off in order to get the pump back online. It was unusually hot at 52 C. Hottest it got in bake 2 was 38 C.
|
208
|
Tue Aug 15 16:04:23 2023 |
Aiden | Update | VAC | VAC Heating System Update |
Pulled off the rest of the heater tape along with the aluminum tape left behind. The aluminum tape adhesive left behind a ton of junk on the walls of the chamber. This is probably due to excessive heating. In order to get the adhesive off I sprayed a vector alpha wipe with acetone and wiped down the walls. This took a lot of acetone to get it off.
When removing some of the aluminum tape I noticed small sections that seemed to have been melted to the silicone part of the heater tape and would have been damaging to try and forcefully remove it.
The heater tape is now ready to be put on again but now with the start of the tape placed on the other side so that the PID controllers can be placed on the shelf above the chamber and be seen outside of the curtain.
|
212
|
Thu Aug 17 15:02:44 2023 |
Aiden | Update | VAC | VAC Heating System Update |
Put the heating tape back on and made sure to have 4 coils around the barrel of the chamber. To make this happen I did not put any heater tape on the ports but made sure to place some of the heater no more than 1 inch away from the ports. Also re-placed some of the heating sensors. For the PID controllers there is one sensor placed on the lid and one sensor placed on the barrel. For the temperature alarms one sensor was placed near the flange of the turbo pump and another placed on the cross in the RGA line. Note that all four of these sensors were placed under the heating tape compared to the last few bakes where they were on top.
The insulation was also put back on and now the chamber should be ready for a low temperature bake after some RGA data is taken before for comparison.
|
213
|
Thu Aug 17 15:18:48 2023 |
Aiden | Update | VAC | VAC Heating System Update |
Relocated the PID controllers so that the heating tape could be plugged in. In the picture the left one controls the top half of the chamber along with the RGA line and has its sensor on the lid near a fold. The right one controls the bottom half along with the turbo pump line and the bypass line and has its sensor on the barrel of the chamber. The chamber is almost ready to bake again and just needs to have the full range gauges and RGA electronics box removed. |
308
|
Thu Jan 18 15:13:37 2024 |
Aiden | Update | VAC | VAC Heating System Update |
[Aiden]
Took more data today and the chamber and elements are showing an even lower HC level than we have gotten before. It is safe to say that the elements are not contaminated and out gassing HC into the chamber. |
325
|
Tue Feb 13 12:34:04 2024 |
Aiden | Update | VAC | VAC Heating System Update |
Here is an overlay with for all the heating steps done with the heater elements. |
269
|
Thu Nov 16 19:32:31 2023 |
Aiden | Update | VAC | VAC HC Levels Update |
Took some more RGA data today and overlaid it with data taken from October 19. I added a red line that symbolizes where all amu peaks above 44 need to be bellow as well as a black square around the 44th amu peak. The chamber is very close to being meeting LIGO's vacuum chamber standards. |
140
|
Fri Jun 30 16:43:14 2023 |
Pamella | Update | FLIR | Updates: Small moving the FLIR camera |
[Pamella]
Today, I was able to make some adjustments to the FLIR camera angle, suggested by Dr. Richardson, and we got small possible movements keeping the same pattern in the shapes of the triangles. I have attached photos below. I was able to move left and right as well as up and down and it worked in four points that I marked on the table.
The only problem is that it only worked on a part of the screen, if I try to place it farther to the right or to the left, we are back to the same problem as yesterday.
|
523
|
Tue Feb 25 01:37:00 2025 |
Michael | Update | Interferometer Simulations | Updates and Current Next Steps for Toroidal Mirrors Project |
Since the previous discussion of this project, I've worked on building finesse models to verify mathematical results which model the astigmatism in a two mirror system which we attempt to minimize. This left us with a single condition for an output non-astigmatic beam. However, as can be seen in finesse simulations, there does exist other configurations which have a negligibly small astigmatism, which we may want to consider. Below I've attached the link to my overleaf project which has some updated information which I plan on discussing.
https://www.overleaf.com/project/67968921426e61d5b2fd8c96 |
453
|
Wed Oct 2 12:20:43 2024 |
Tyler | Update | TCS | Updated FROSTI Analysis 10/02/2024 |
Attached below are updates on current FROSTI prototype analysis. |
414
|
Mon Jul 29 12:20:56 2024 |
Liu | Update | Interferometer Simulations | Update on wavefront actuation with astigmatically driven RH for CE |
Update on wavefront actuation with astigmatically driven RH for CE is attached. |
425
|
Fri Aug 16 12:51:46 2024 |
Luis Martin | Update | VAC | Update on vacuum chamber status |
[Luis, Luke, Tyler]
Vacuum chamber parts were finally received and assembled. After whipping down the parts, the blank was removed from the reducing cross. Then, the zero-length reducer was attached. Lastly, we installed the T that had the argon leak and RGA. The final pump down showed signs of an improved seal since the pressure dropped quite fast. This pressure is well bellow the limit required to use the RGA, argon test leak could be performed some time next week. |