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ID Date Author Type Category Subject Text Attachments
  2647   Thu Aug 19 14:34:10 2021 RadhikaDailyProgressCryo vacuum chamberCooldown model fitting for MS   model_fit_tm_painted.pdfmodels_painted.pdf 
  2646   Wed Aug 18 13:06:03 2021 Aidan, StephenLab InfrastructureCleanlinessNorth table clean-upStephen and I spent about an hour today
tidying up the North Table in preparation
for 2um photodiode testing in the Megastat.
 IMG_4230a.jpgIMG_4232a.jpg 
  2645   Sun Aug 15 00:33:15 2021 KojiSummaryCryo vacuum chamberAquadag painting on the inner shield[Stephen Koji]

We applied Aquadag painting on
the inner side of the inner shield.
 IMG_9636.JPGIMG_9632.JPGIMG_9646.JPG 
  2644   Fri Aug 13 21:01:42 2021 RadhikaDailyProgressCryo vacuum chamberCooldown model fitting for MSWow, 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 RadhikaDailyProgressCryo vacuum chamberCooldown model fitting for MSPer Koji's suggestion, I added two
terms to the expression for test mass cooling
power for radiative/conductive cooling from
 rad_295_model_fit_v_data.pdf 
  2642   Wed Aug 11 18:00:19 2021 KojiDailyProgressCryo vacuum chamberCooldown model fitting for MSHow about incorporating radiative and conductive
terms from the object at 300K?

 
  
  2641   Wed Aug 11 14:58:47 2021 RadhikaDailyProgressCryo vacuum chamberCooldown model fitting for MSI've made simplifications to the testmass
cooling model. Assuming 2 possible cooling
mechanisms, radiative and conductive, the
 rad_model_fit_v_data.pdfrad_cond_model_fit_v_data.pdf 
  2640   Fri Aug 6 16:15:03 2021 PacoLab Infrastructure2micronLasersBrimrose AOM and amplifierAlso borrowed Mini-Circuits amplifier ZFL-500LN+
from same setup.

  
  2639   Thu Aug 5 14:29:42 2021 StephenLaser2um PhotodiodesOptical design for 2um PD in new cryo chamberActions 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
 IMG_9685.JPGIMG_9687.JPGrouting_markup_of_IMG_9688.pngIMG_9682.JPG 
  2638   Thu Aug 5 14:12:36 2021 StephenDailyProgressCryo vacuum chamberloading 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 AidanLaser2um PhotodiodesOptical design for 2um PD in new cryo chamberHere's a more detailed layout of the
in-air design for the PD testing. Things
to note:
 Cryo_in-air_setup.pdf 
  2636   Thu Aug 5 11:53:26 2021 RadhikaDailyProgressCryo vacuum chamberCooldown model fitting for MSI've used the following model
for cooling of the coldplate and testmass
in Megastat:
 model_fit_v_data.pdf 
  2635   Thu Aug 5 09:20:44 2021 AidanLaser2um PhotodiodesOptical design for 2um PD in new cryo chamberI've sketched out a way to change the
beam size on the in-vacuum PD. I think the
beam diameter coming from the collimator
 Cryo_Chamber_optical_layout.pdf 
  2634   Wed Aug 4 18:55:58 2021 aaronDailyProgressCryo vacuum chamberloading cantilevers into megastatThis 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 KojiDailyProgressCryo vacuum chamberWarmup started 02 August- Confirmed the heating stopped in the
evening -> The heater was deactivated
@~23:00
 P_20210804_000247.jpgP_20210803_235421.jpg 
  2632   Mon Aug 2 21:51:37 2021 KojiDailyProgressCDSConnecting CTC100 to EPICS/rtcds systemThe legit
way to restart st.cmd is

  
  2631   Mon Aug 2 17:24:20 2021 RadhikaDailyProgressCDSConnecting CTC100 to EPICS/rtcds systemI added an EPICS channel for the heater
power controlled by the 
  
  2630   Mon Aug 2 13:25:32 2021 StephenDailyProgressCryo vacuum chamberWarmup started 02 AugustWith 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 KojiSummaryCryo vacuum chamberCooling updateThe test mass temperature indicates 121K@100hr
but there seemed a few sensor glitches for
the test mass (𝛥=-4.2K) and the inner
 temp_log_cool_down_20210728_1830.pdfcooling_meas.pdfOSEM_cooling.pdfcooldown_210728.zip 
  2628   Fri Jul 30 18:18:21 2021 KojiDailyProgressCDSConnecting 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 RadhikaDailyProgressCDSConnecting 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 StephenThings to BuyCryo vacuum chamberUpgrades 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 KojiSummaryCryo vacuum chamberCooling curve comparisonsIn all aspects, the latest cooling shows
the best performance thanks to better thermal
connection, thermal isolation, and the black
 comparison_cold_head.pdfcomparison_inner_shield.pdfcomparison_test_mass.pdf 
  2624   Fri Jul 30 12:22:15 2021 RadhikaDailyProgressCDSConnecting CTC100 to EPICS/rtcds systemCurrently 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 RadhikaDailyProgressCryo vacuum chamberCooling model updates from Koji's analysisI replicated Koji's recent cooldown
analysis on data prior to painting the test
mass with black coating. The model first
 cooldown_Cp_fixed.pdfcooldown_Cp_varying.pdfe_tm_comp_Cp_fixed.pdf 
  2622   Thu Jul 29 13:11:17 2021 KojiSummaryCryo vacuum chamberCooling progress: UpdateThe current cooling curve suggests that
the radiative cooling factor Fe (black body
=1) increased from 0.15 to 0.5.
 temp_log_cool_down_20210728_1830.pdfcooling_model1.pdfcooling_model2.pdfOSEM_cooling.pdf 
  2621   Thu Jul 29 00:42:38 2021 KojiSummaryCryo vacuum chamberThe test mass successfully suspended[Stephen Koji]

Road to cooling down


The suspension with the
  
  2620   Wed Jul 28 00:59:47 2021 KojiSummaryCryo vacuum chamberThe test mass successfully suspended[Stephen Koji]

While Stephen worked on the RTD
reattachment, I worked on the suspension
 P_20210727_154143.jpegP_20210727_190356.jpegP_20210727_190426.jpegP_20210727_190543.jpeg 
  2619   Mon Jul 26 22:49:00 2021 KojiSummaryCryo vacuum chamberAquadag painting[Stephen Koji]

We decided to paint the
silicon test mass with Aquadag to increase
 10x 
  2618   Mon Jul 26 01:30:42 2021 KojiSummaryCryo vacuum chamberPrep for the 2nd cooling of the suspensionUpdated Jul 26, 2022 - 22:00

 


Reconstruct the
  
  2617   Sun Jul 25 21:45:46 2021 KojiSummaryCryo vacuum chamberAbout the radiation heat transfer modelThe following radiation cooling model well
explained the cooling curve of the test mass
(until ~150K)
  
  2616   Fri Jul 23 20:53:40 2021 KojiSummaryGeneralJul 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
 P_20210723_212158.jpg 
  2615   Thu Jul 22 22:03:45 2021 KojiSummaryCryo vacuum chamberTest 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
 IMG-9395.jpgtemp_log_warmup_20210721_2052.pdf 
  2614   Wed Jul 21 21:05:59 2021 KojiSummaryCryo vacuum chamberTest mass cooling (2021/07/16 ~ 2021/07/21)[Stephen and Koji for discussion
/ Koji for the execution]

1. Temperature Trend
 oplev_trend.png20210721201333_IMG_0765.jpeg20210716234113_IMG_0742.jpegScreenshot_from_2021-07-21_20-19-09.png 
  2613   Wed Jul 21 14:53:28 2021 KojiSummaryGeneralJul 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 PacoLab Infrastructure2micronLasersBrimrose AOM and amplifierYesterday 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 KojiSummaryCryo vacuum chamberA cooling model (Temp Log 210716_2255)Updated the model the latest log
data with cooling prediction


The radiative cooling is
 cooling_model.pdf 
  2610   Tue Jul 20 11:33:52 2021 KojiSummaryCryo vacuum chamberA cooling model (Temp Log 210716_2255)A naive cooling model was applied
to the cooling curve.
A wild guess:
 cooling_model.pdfIMG_9390.JPGIMG_9391.JPG 
  2609   Mon Jul 19 17:21:19 2021 KojiSummaryCryo vacuum chamberTemp Log 210716_2255Temp Log on Jul 19 2021 17:20

I wonder what is the heat transfer
mode for the test mass right now. Radiative?
 temp_log_cool_down_20210716_2255.pdf 
  2608   Mon Jul 19 15:57:17 2021 StephenSummaryCryo vacuum chamberTemp Log 210716_2255Uh oh, review of the
cooldown plot from the previous cooldown
(QIL/2603)
  
  2606   Sat Jul 17 00:55:41 2021 KojiSummaryCryo vacuum chamberTemp Log 210716_2255Temperature log for the first 2 hours (Attachment
1)

I wonder why the temperatures displayed
 temp_log_cool_down_20210716_2255.pdf 
  2605   Fri Jul 16 23:28:24 2021 KojiSummaryCryo vacuum chamberSus Test Work 07/16/2021[Stephen Koji]

We started cooling down
of the test mass. 
 7x 
  2604   Thu Jul 15 23:37:53 2021 KojiSummaryCryo vacuum chamberBonding work for the prep of the preliminary suspension test[Stephen / Koji]

Bonding work for the prep of the
preliminary suspension test
 P_20210715_170102-1.jpgP_20210715_172218-1.jpgexperiment_plan.pdf 
  2603   Thu Jul 15 23:34:17 2021 KojiSummaryTempCtrlTemprerature Log for cooling down / warming up[Stephen Koji Radhika]

Stephen and Radhika worked on the
cooling down and warming up of the cryostat
 temp_log_cooldown_20210709_1747.pdftemp_log_warmup_20210712_1315.pdf 
  2602   Mon Jul 12 14:42:42 2021 StephenDailyProgressCryo vacuum chamberRTD attached to coldhead with spring clamp, Si mass to be installed this weekBrief 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 RadhikaSummaryCryo vacuum chamber1D cooling model updates*Takeaway*: The current 1D cooling model
is getting closer to matching our observed
cooling trends, mainly in the lower temperature
 model_vs_data_7-1.pdfcoldhead_capacity.pdfmodel_vs_data_7-1.pdf 
  2600   Fri Jul 9 10:57:58 2021 RadhikaSummaryCryo vacuum chamberCTC100 temperature extractionI wrote a python script to extract temperature
data from the CTC100 via ethernet, for monitoring
cooldown/warmup of Megastat. This is intended
 terminal1.png 
  2599   Tue Jul 6 18:07:20 2021 RadhikaDailyProgressCryo vacuum chamberCooldown 7/1-7/6I've attached cooldown data from 7/1-7/4,
which was extracted via ethernet from the
CTC100. Initially I was having issues getting
 cooldown_7-1.pdf 
  2598   Fri Jul 2 11:27:01 2021 RadhikaDailyProgressCryo vacuum chamberCcooling 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 StephenThings to Buy2um PhotodiodesIntegrating 2um PD measurements into Cryo Vacuum ChamberRadhika and I started discussing in detail
the items needed to transfer the 2um PD setup
into the Cryo Vacuum Chamber.
  
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