| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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. |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
168
|
Thu Jul 20 18:03:19 2023 |
Aiden | Update | VAC | Vacuum Chamber Baking Update |
Took another set of RGA data after the
second bake has cooled down to 27 degC.
Just
by visual comparison to the other graphs, |
|
|
170
|
Mon Jul 24 14:55:53 2023 |
Jon | Update | VAC | Removed extension power cable | I removed the extension cable that was powering
the leftmost heater controller, since there
is no bake currently happening. It is currently |
|
|
179
|
Fri Jul 28 13:46:17 2023 |
Aiden | Update | VAC | Vacuum Chamber Baking Update |
Took some more data to look at the HC
count. Initial data was from leaving the
Argon leak closed and then left it open for |
|
|
184
|
Tue Aug 1 12:10:03 2023 |
Aiden | Update | VAC | Vacuum Chamber Baking Update |
Dr. Richardson and I took off the insulation
on the lid again to add more insulation in-between
the heater tape folds in addition to what |
|
|
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 |
|
|
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, |
|
|
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 |
|
|
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. |
|
|
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. |
10x |
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
11x |
|
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 |
6x |
|
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 |
11x |
|
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 |
|
|
214
|
Mon Aug 21 17:13:25 2023 |
Aiden | Update | VAC | Vacuum Chamber Baking Update |
Came in to take RGA data and found the
turbo pump drawing .38 Amps. This was much
higher than what it was on Friday. I investigated |
|
|
215
|
Mon Aug 28 14:43:50 2023 |
Aiden | Update | VAC | Vacuum Chamber Baking Update | The PID controllers were turned off on Friday
and the chamber was left to cool over the
weekend. Just took data and it looks like |
|
|
216
|
Tue Aug 29 19:09:21 2023 |
Aiden | Update | VAC | Vacuum Chamber Baking Update | Here are some more plots with the RGA data
take August 29. It seems that more pumping
time has led to the HC levels being dramatically |
|
|
218
|
Thu Aug 31 12:56:29 2023 |
Aiden | Update | VAC | Vacuum Chamber Baking Update | Took some more RGA data to see if the HC levels
have further declined since bake 4 and it
seems that it has started to plateau with |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
226
|
Fri Sep 15 17:33:35 2023 |
Aiden | Update | VAC | Vacuum Chamber Baking Update | Took some more RGA data and see that the chamber
has gotten much cleaner since monday. Next
step would be another bake with some focus |
|
|
238
|
Wed Oct 11 20:47:11 2023 |
Jon | Update | VAC | Vacuum upgrade begins | [Jon, Tyler, Aiden, Peter]
Upgrade of the UHV system to a larger
turbo pump began today. After obtaining a |
|
|
239
|
Thu Oct 12 12:11:10 2023 |
Aiden | Update | VAC | Vacuum chamber Helium leak test | [Aiden, Tyler, Peter, Jon]
Continued
tightening bolts on the turbo pump and 6"-8"
reducer to reduce the leak. The final leak |
|
|
240
|
Thu Oct 19 11:41:04 2023 |
Aiden | Update | VAC | Vacuum Chamber Baking Update | [Aiden, Tyler, Mohak]
Took some RGA
data when we came into the room. The pressure
of the chamber was 8.63e-8 Torr before turning |
6x |
|
245
|
Thu Oct 26 13:00:45 2023 |
Aiden | Update | VAC | Vacuum Chamber Baking Update | Bake 6 was turned off on Monday. Tooke RGA
data today and have posted the data below.
The pressure of the chamber after taking |
|
|
246
|
Fri Oct 27 15:16:31 2023 |
Aiden | Update | VAC | Vacuum Leak Test | Leak tested the worst flanges on the chamber
after moving it and after bake 6. The 6 inch
flange connected to the 8 inch reducing nipple |
|
|
248
|
Mon Oct 30 08:42:22 2023 |
Jon | Update | VAC | Vacuum Leak Test | By 5:30 pm Friday, the pressure had reached
8.6e-8 torr and was continuing to fall. So
it seems we are OK to proceed with permanentizing |
|
|
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 |
|
|
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 |
|
|
258
|
Thu Nov 9 13:48:47 2023 |
Aiden | Update | VAC | Vacuum Chamber Baking Update | After bake 7 was stopped on Wednesday morning
(11,8,2023), I took RGA data of the chamber
to compare to a later scan that will be done |
|
|
261
|
Fri Nov 10 08:32:34 2023 |
Jon | Update | VAC | RGA experiments | I ran a 3-minute
degas cycle of the RGA filament for the first
time yesterday (in this process, the filament |
|
|
264
|
Mon Nov 13 11:07:50 2023 |
Tyler | Update | VAC | RTD Analysis |
After initial analysis from last week
on a single RTD, I then extended to looking
at all 8 in series with R_ref (set to 1 kOhm). |
|
|
266
|
Tue Nov 14 17:21:40 2023 |
Jon | Update | VAC | RGA best practices | As a follow up ELOG 261,
I have received advice from one of the vacuum
experts at LIGO Hanford on best practices |
|
|
267
|
Wed Nov 15 21:52:33 2023 |
Aiden | Update | VAC | Vacuum Chamber Baking Update | Took RGA data before running the degas mode.
Made sure to close off the main volume before
running the degas. And left the filament |
|
|
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 |
|
|
272
|
Mon Nov 20 20:37:45 2023 |
Aiden | Update | VAC | Clean and Bake Batch 20 | [Aiden, Luis]
Started to clean and bake the
macor parts for the FROSTI reflector. Per
LIGO documentation cleaned the macor in liquinox |
|
|
273
|
Mon Nov 20 20:45:16 2023 |
Aiden | Update | VAC | Leak Test |
[Aiden, Luis]
Tested every weld
and flange to find leaks. Only found that
the flange on the turbo pump and reducing |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
284
|
Mon Dec 4 11:19:50 2023 |
Aiden | Update | VAC | Vacuum Chamber Baking Update | [Aiden]
Took some RGA data of the chamber
after it has been cooling down. I do not
believe that this data accurately shows the |
|
|
286
|
Thu Dec 7 12:42:42 2023 |
Aiden | Update | VAC | Vacuum Chamber Baking Update | After leaving the RGA on for a few days the
chamber has settled at 2.01 e-8 torr. I also
have good news that the chamber looks to |
|