| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
2647
|
Thu Aug 19 14:34:10 2021 |
Radhika | DailyProgress | Cryo vacuum chamber | Cooldown model fitting for MS | |
|
|
2646
|
Wed Aug 18 13:06:03 2021 |
Aidan, Stephen | Lab Infrastructure | Cleanliness | North table clean-up | Stephen and I spent about an hour today
tidying up the North Table in preparation
for 2um photodiode testing in the Megastat. |
|
|
2645
|
Sun Aug 15 00:33:15 2021 |
Koji | Summary | Cryo vacuum chamber | Aquadag painting on the inner shield | [Stephen Koji]
We applied Aquadag painting on
the inner side of the inner shield. |
|
|
2644
|
Fri Aug 13 21:01:42 2021 |
Radhika | DailyProgress | Cryo vacuum chamber | Cooldown model fitting for MS | Wow, nice fit!
How is this c compared to the 300K
exposure from the open aperture for the oplev |
|
|
2643
|
Fri Aug 13 15:14:14 2021 |
Radhika | DailyProgress | Cryo vacuum chamber | Cooldown model fitting for MS | Per Koji's suggestion, I added two
terms to the expression for test mass cooling
power for radiative/conductive cooling from |
|
|
2642
|
Wed Aug 11 18:00:19 2021 |
Koji | DailyProgress | Cryo vacuum chamber | Cooldown model fitting for MS | How about incorporating radiative and conductive
terms from the object at 300K?
|
|
|
2641
|
Wed Aug 11 14:58:47 2021 |
Radhika | DailyProgress | Cryo vacuum chamber | Cooldown model fitting for MS | I've made simplifications to the testmass
cooling model. Assuming 2 possible cooling
mechanisms, radiative and conductive, the |
|
|
2640
|
Fri Aug 6 16:15:03 2021 |
Paco | Lab Infrastructure | 2micronLasers | Brimrose AOM and amplifier | Also borrowed Mini-Circuits amplifier ZFL-500LN+
from same setup.
|
|
|
2639
|
Thu Aug 5 14:29:42 2021 |
Stephen | Laser | 2um Photodiodes | Optical design for 2um PD in new cryo chamber | Actions on my to-do list, once we are warm
and up to air, before Aidan and I are able
to run the JPL PD test. This list complements |
|
|
2638
|
Thu Aug 5 14:12:36 2021 |
Stephen | DailyProgress | Cryo vacuum chamber | loading cantilevers into megastat (and actions toward pumping down) | Actions on my to-do list, before we are
able to pump down for Aaron and Shruti’s
Si Cantilever Q measurement: |
|
|
2637
|
Thu Aug 5 12:39:56 2021 |
Aidan | Laser | 2um Photodiodes | Optical design for 2um PD in new cryo chamber | Here's a more detailed layout of the
in-air design for the PD testing. Things
to note: |
|
|
2636
|
Thu Aug 5 11:53:26 2021 |
Radhika | DailyProgress | Cryo vacuum chamber | Cooldown model fitting for MS | I've used the following model
for cooling of the coldplate and testmass
in Megastat: |
|
|
2635
|
Thu Aug 5 09:20:44 2021 |
Aidan | Laser | 2um Photodiodes | Optical design for 2um PD in new cryo chamber | I've sketched out a way to change the
beam size on the in-vacuum PD. I think the
beam diameter coming from the collimator |
|
|
2634
|
Wed Aug 4 18:55:58 2021 |
aaron | DailyProgress | Cryo vacuum chamber | loading cantilevers into megastat | This afternoon I met with Aidan and Stephen
about near-term plans for the megastat. Aidan
and I got familiar with the various viewports, |
6x |
|
2633
|
Tue Aug 3 23:56:00 2021 |
Koji | DailyProgress | Cryo vacuum chamber | Warmup started 02 August | - Confirmed the heating stopped in the
evening -> The heater was deactivated
@~23:00 |
|
|
2632
|
Mon Aug 2 21:51:37 2021 |
Koji | DailyProgress | CDS | Connecting CTC100 to EPICS/rtcds system | The legit
way to restart st.cmd is
|
|
|
2631
|
Mon Aug 2 17:24:20 2021 |
Radhika | DailyProgress | CDS | Connecting CTC100 to EPICS/rtcds system | I added an EPICS channel for the heater
power controlled by the |
|
|
2630
|
Mon Aug 2 13:25:32 2021 |
Stephen | DailyProgress | Cryo vacuum chamber | Warmup started 02 August | With Test Mass RTD at 119K, and with all
of Koji's trials completed, I started
the warmup this afternoon. |
|
|
2629
|
Sun Aug 1 22:22:00 2021 |
Koji | Summary | Cryo vacuum chamber | Cooling update | The test mass temperature indicates 121K@100hr
but there seemed a few sensor glitches for
the test mass (𝛥=-4.2K) and the inner |
|
|
2628
|
Fri Jul 30 18:18:21 2021 |
Koji | DailyProgress | CDS | Connecting CTC100 to EPICS/rtcds system | [Radhika, Koji]
During the process, we corrected
the channel labeling for RTD #3/#4. So |
|
|
2627
|
Fri Jul 30 17:28:14 2021 |
Radhika | DailyProgress | CDS | Connecting CTC100 to EPICS/rtcds system | [Koji, Radhika]
We were able to successfully integrate
the Megastat CTC100 temp data into EPICS |
|
|
2626
|
Fri Jul 30 14:44:56 2021 |
Stephen | Things to Buy | Cryo vacuum chamber | Upgrades and updates in advance of PD testing | (Aidan, Stephen, Koji)
Building off of QIL/2597
after more thorough discussion in Mariner |
|
|
2625
|
Fri Jul 30 12:22:56 2021 |
Koji | Summary | Cryo vacuum chamber | Cooling curve comparisons | In all aspects, the latest cooling shows
the best performance thanks to better thermal
connection, thermal isolation, and the black |
|
|
2624
|
Fri Jul 30 12:22:15 2021 |
Radhika | DailyProgress | CDS | Connecting CTC100 to EPICS/rtcds system | Currently the CTC100 temperature data for
Megastat is extracted via ethernet (telnet)
through a python file. The file queries the |
|
|
2623
|
Fri Jul 30 09:48:11 2021 |
Radhika | DailyProgress | Cryo vacuum chamber | Cooling model updates from Koji's analysis | I replicated Koji's recent cooldown
analysis on data prior to painting the test
mass with black coating. The model first |
|
|
2622
|
Thu Jul 29 13:11:17 2021 |
Koji | Summary | Cryo vacuum chamber | Cooling progress: Update | The current cooling curve suggests that
the radiative cooling factor Fe (black body
=1) increased from 0.15 to 0.5. |
|
|
2621
|
Thu Jul 29 00:42:38 2021 |
Koji | Summary | Cryo vacuum chamber | The test mass successfully suspended | [Stephen Koji]
Road to cooling down
The suspension with the |
|
|
2620
|
Wed Jul 28 00:59:47 2021 |
Koji | Summary | Cryo vacuum chamber | The test mass successfully suspended | [Stephen Koji]
While Stephen worked on the RTD
reattachment, I worked on the suspension |
|
|
2619
|
Mon Jul 26 22:49:00 2021 |
Koji | Summary | Cryo vacuum chamber | Aquadag painting | [Stephen Koji]
We decided to paint the
silicon test mass with Aquadag to increase |
10x |
|
2618
|
Mon Jul 26 01:30:42 2021 |
Koji | Summary | Cryo vacuum chamber | Prep for the 2nd cooling of the suspension | Updated Jul 26, 2022 - 22:00
Reconstruct the |
|
|
2617
|
Sun Jul 25 21:45:46 2021 |
Koji | Summary | Cryo vacuum chamber | About the radiation heat transfer model | The following radiation cooling model well
explained the cooling curve of the test mass
(until ~150K) |
|
|
2616
|
Fri Jul 23 20:53:40 2021 |
Koji | Summary | General | Jul 17, 2021: Canon camera / small silver tripod / macro zoom lens / LED ring light returned / ELectronics borrowed | [Returned] Brought one HAM-A coil driver
(D1100687 / S2100619) and one Satellite Amplifier
(D1002818 / S2100741) from the 40m |
|
|
2615
|
Thu Jul 22 22:03:45 2021 |
Koji | Summary | Cryo vacuum chamber | Test mass heating in progress (2021/07/21 ~ 2021/07/23) | - Temperature Log updated 2021/7/23
12:00 Heating Ended
- Assuming reaching the room temp |
|
|
2614
|
Wed Jul 21 21:05:59 2021 |
Koji | Summary | Cryo vacuum chamber | Test mass cooling (2021/07/16 ~ 2021/07/21) | [Stephen and Koji for discussion
/ Koji for the execution]
1. Temperature Trend |
|
|
2613
|
Wed Jul 21 14:53:28 2021 |
Koji | Summary | General | Jul 17, 2021: Canon camera / small silver tripod / macro zoom lens / LED ring light borrowed -> QIL | See https://nodus.ligo.caltech.edu:8081/40m/16250 |
|
|
2612
|
Wed Jul 21 13:14:11 2021 |
Paco | Lab Infrastructure | 2micronLasers | Brimrose AOM and amplifier | Yesterday I came in the QIL and performed
an express kidnapping of the 2um in fiber
AOM (Brimrose) and the 5 W RF amplifier that |
|
|
2611
|
Tue Jul 20 17:28:30 2021 |
Koji | Summary | Cryo vacuum chamber | A cooling model (Temp Log 210716_2255) | Updated the model the latest log
data with cooling prediction
The radiative cooling is |
|
|
2610
|
Tue Jul 20 11:33:52 2021 |
Koji | Summary | Cryo vacuum chamber | A cooling model (Temp Log 210716_2255) | A naive cooling model was applied
to the cooling curve.
A wild guess: |
|
|
2609
|
Mon Jul 19 17:21:19 2021 |
Koji | Summary | Cryo vacuum chamber | Temp Log 210716_2255 | Temp Log on Jul 19 2021 17:20
I wonder what is the heat transfer
mode for the test mass right now. Radiative? |
|
|
2608
|
Mon Jul 19 15:57:17 2021 |
Stephen | Summary | Cryo vacuum chamber | Temp Log 210716_2255 | Uh oh, review of the
cooldown plot from the previous cooldown
(QIL/2603) |
|
|
2606
|
Sat Jul 17 00:55:41 2021 |
Koji | Summary | Cryo vacuum chamber | Temp Log 210716_2255 | Temperature log for the first 2 hours (Attachment
1)
I wonder why the temperatures displayed |
|
|
2605
|
Fri Jul 16 23:28:24 2021 |
Koji | Summary | Cryo vacuum chamber | Sus Test Work 07/16/2021 | [Stephen Koji]
We started cooling down
of the test mass. |
7x |
|
2604
|
Thu Jul 15 23:37:53 2021 |
Koji | Summary | Cryo vacuum chamber | Bonding work for the prep of the preliminary suspension test | [Stephen / Koji]
Bonding work for the prep of the
preliminary suspension test |
|
|
2603
|
Thu Jul 15 23:34:17 2021 |
Koji | Summary | TempCtrl | Temprerature Log for cooling down / warming up | [Stephen Koji Radhika]
Stephen and Radhika worked on the
cooling down and warming up of the cryostat |
|
|
2602
|
Mon Jul 12 14:42:42 2021 |
Stephen | DailyProgress | Cryo vacuum chamber | RTD attached to coldhead with spring clamp, Si mass to be installed this week | Brief summaries of the last week's
progress and the coming week's plans
(plots will be posted soon!): |
|
|
2601
|
Fri Jul 9 13:44:39 2021 |
Radhika | Summary | Cryo vacuum chamber | 1D cooling model updates | *Takeaway*: The current 1D cooling model
is getting closer to matching our observed
cooling trends, mainly in the lower temperature |
|
|
2600
|
Fri Jul 9 10:57:58 2021 |
Radhika | Summary | Cryo vacuum chamber | CTC100 temperature extraction | I wrote a python script to extract temperature
data from the CTC100 via ethernet, for monitoring
cooldown/warmup of Megastat. This is intended |
|
|
2599
|
Tue Jul 6 18:07:20 2021 |
Radhika | DailyProgress | Cryo vacuum chamber | Cooldown 7/1-7/6 | I've attached cooldown data from 7/1-7/4,
which was extracted via ethernet from the
CTC100. Initially I was having issues getting |
|
|
2598
|
Fri Jul 2 11:27:01 2021 |
Radhika | DailyProgress | Cryo vacuum chamber | Ccooling updates 6/29-7/2 | [Radhika, Stephen]
On Tuesday 6/29, we opened up Megastat
after a weekend of warmup. Our goals were |
16x |
|
2597
|
Tue Jun 29 17:29:16 2021 |
Stephen | Things to Buy | 2um Photodiodes | Integrating 2um PD measurements into Cryo Vacuum Chamber | Radhika and I started discussing in detail
the items needed to transfer the 2um PD setup
into the Cryo Vacuum Chamber. |
|