40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  ATF eLog, Page 54 of 56  Not logged in ELOG logo
ID Dateup Author Type Category Subject Text Attachments
  2676   Wed Oct 6 13:50:18 2021 AidanSummary2micronLasersStarting data taking and second test of JPL PD A1
Turned cryocooler off around 1317588441
(about 1:46PM)
Restarted measurement
with output going to JPL_PD/data/A1_test3
Room
  
  2677   Thu Oct 7 08:07:03 2021 AidanSummary2micronLasersStarting data taking and second test of JPL PD A1
We're at 164K as of 8AM this
morning.
  
  2678   Mon Oct 11 08:35:21 2021 AidanSummary2micronLasersStarting data taking and second test of JPL PD A1Terminated the data taking at 8:35Am this
morning. The termperature traces of the cryo
chamber show a couple of discontinuities
 Screenshot_from_2021-10-11_08-36-06.png 
  2679   Mon Oct 18 15:25:14 2021 AidanSummary2micronLasersStarting data taking and second test of JPL PD A1Initial running of analysis code puts the
max QE at ~62 + /- 1% around 130-150K. I
want to explore this temperature regime manually
  
  2680   Thu Oct 21 15:32:32 2021 Aidan, RadhikaLaser2um PhotodiodesImproved measurement of QE on photodiodes ~89% at 140K[Aidan, Radhika]

We turned off the heater and the
cryocooler this morning to around 11:30AM
 IMG_5305.jpg 
  2681   Thu Oct 21 16:52:26 2021 ranaLaser2um PhotodiodesImproved measurement of QE on photodiodes ~89% at 140Kits worth looking into how fiber optic
mode cleaning actually works:

https://doi.org/10.1201/9780203739662
  
  2682   Thu Oct 21 17:48:33 2021 AidanLaser2um PhotodiodesImproved measurement of QE on photodiodes ~89% at 140KDefinitely. I think the lack of beam profiling/imaging
equipment is something we want to address
too. We will waste a lot of time in Mariner
  
  2683   Fri Oct 22 09:20:13 2021 AidanLaser2um PhotodiodesImproved measurement of QE on photodiodes ~89% at 140KSome of the data recorded during the current/micrometer
scanning yesterday.


Distance between fiber/lens
  
  2684   Fri Oct 22 12:04:13 2021 ranaLaser2um PhotodiodesImproved measurement of QE on photodiodes ~89% at 140Kagreed. You should put into Voyager chat
and cryo/ET slack questins about 2 um beam
profiling. We'll want it for anything
  
  2685   Fri Oct 22 13:31:36 2021 ChrisLaser2um PhotodiodesImproved measurement of QE on photodiodes ~89% at 140KSomewhere
around the labs there should be a DataRay
Beam'R2 scanning slit profiler, with
  
  2686   Mon Oct 25 16:10:51 2021 AidanUpdateCDSRestarted computers and front-end model following campus power outage Rebooted the workstations and FB4.

 Restarted the model on the
FB4:
  
  2687   Mon Oct 25 16:13:47 2021 AidanUpdateCryo vacuum chamberHeater left on - chamber got warmThe cryocooler was switched off last Thursday
to do testing on the JPL_PD. I turned the
heater back on during this testing and neglected
 Screenshot_from_2021-10-25_16-19-39.png 
  2689   Tue Oct 26 07:32:52 2021 AidanUpdateCryo vacuum chamberHeater left on - chamber got warmWe're at 300K as of 7AM this morning.




  
  2690   Tue Oct 26 08:43:38 2021 AidanUpdateCryo vacuum chamberCTC100 temperature alarm and heater shutoffInstructions on how to enable the alarm
and heater shut off for the CTC100.

Status: This reports
 Screenshot_from_2021-10-26_08-42-57.pngIMG_5371.jpgIMG_5396.jpgIMG_5401.jpg 
  2691   Wed Oct 27 10:18:33 2021 Aidan, StephenSummaryCryo vacuum chamberInspection of Megastat post 408K event and pumping timeline[Aidan]

I've attached a timeline of
our inspection this afternoon along with
 8x 
  2692   Fri Nov 12 08:21:22 2021 AidanSummary2um PhotodiodesResults from JPL PD: A1-Test3[Aidan]

Here is the analyzed data from
Test 3 of the A1 JPL PD.
 A1_test3_nominal_QE.pdfA1_test3_darkcurrent.pdfA1_test3_noise_spectra_rev.pdf 
  2693   Fri Nov 12 10:54:55 2021 ranaSummary2um PhotodiodesResults from JPL PD: A1-Test3IT would also be good if you could plot
the RMS noise
around 10 Hz and 100 Hz as a function of
  
  2694   Fri Nov 12 14:21:32 2021 Stephen, RadhikaDailyProgressCryo vacuum chamberUpgrade to Rigid Copper Bar, and assorted transitions from PD testingThis post describes upgrade efforts from
10 - 16 November, with the following goals:

 - introducing a solid copper
 10x 
  2695   Fri Nov 12 14:31:38 2021 Stephen, RadhikaDailyProgressCryo vacuum chamberRadiative Cooling of Si Mass, with better shield emissivityIn this phase, we are working toward improving
our setup with a rigid copper bar, and obtaining
a new data point for our radiative cooling
 IMG_2738.jpegIMG_2741.jpegIMG_2742.jpegIMG_2745.jpegIMG_2747.jpeg 
  2696   Fri Nov 19 09:36:52 2021 AnchalMiscEquipment transferBorrowing two 2" opticsI came and looked around for a Y1S HR coated
2" optic. I found two ATFilms labeled
optics with information of only their substrate.
 PXL_20211119_174146457.jpg 
  2697   Fri Nov 19 14:01:40 2021 Stephen, RadhikaDailyProgressCryo vacuum chamberRadiative Cooling of Si Mass, with better shield emissivity[WIP]

11/16 was the first Megastat cooldown
after exchanging the copper braid linkage
 comp_cooldown_728_cooldown_1116.pdf 
  2698   Fri Dec 3 09:31:40 2021 RadhikaDailyProgressCryo vacuum chamberTransitioning MS cooldown fitting to MCMC schemeThis week I have been working towards a
Markov-chain Monte Carlo (MCMC) approach
for fitting Megastat cooldown data and obtaining
 MS.stanstan_blackcoat_fit.pdf 
  2699   Sun Dec 5 17:33:50 2021 ranaDailyProgressCryo vacuum chamberTransitioning MS cooldown fitting to MCMC schemethats looking good

You should try to use either the
corner or getdist packages to plot the 'corner'
  
  2701   Fri Dec 10 15:58:57 2021 StephenDailyProgressCryo vacuum chamberRadiative Cooling of Si Mass, with worse inner shield inner surface emissivityStarted a new run this afternoon, with
the following goals:

   1) confirm that the
  
  2702   Thu Dec 16 15:54:44 2021 Stephen, RadhikaDailyProgressCryo vacuum chamberRadiative Cooling of Si Mass, with worse inner shield inner surface emissivity - CTC100 temperature control successThis post will host plots and trends from
this radiative cooling run. At a glance,
the tuned CTC100 PI control was able to control
 cooldown_12-10_all.pdfcooldown_12-10_vs_11-16.pdf 
  2703   Thu Dec 16 17:57:15 2021 Radhika, StephenSummaryCryo vacuum chamberMegastat geometric parametersThis ELOG serves as a compilation of known/measured
geometric parameters of Megastat. This is
informative for thermal modeling of the system,
 D2000310_y-003_20211222.png 
  2704   Tue Dec 21 15:33:39 2021 StephenDailyProgressCryo vacuum chamberRadiative Cooling of Si Mass, with worse inner shield inner surface emissivity - next run repeatingI opened the QIL cryostat today for a health
check and visual inspection before the next
run. Because I saw a couple of interesting
  
  2706   Fri Jan 7 14:54:58 2022 StephenDailyProgressCryo vacuum chamberFastest Radiative Cooling run started 14 JanAs discussed during the 07 Jan 2022 meeting,
the next cryostat run will seek the
fastest radiative cooling through
  
  2707   Mon Jan 10 16:46:19 2022 PacoMiscEquipment transfer2 inch GYRO optics[Paco, Yehonathan]

This afternoon, we entered the
QIL to look for a 2 in optic from the old
 PXL_20220111_004553530.jpg 
  2708   Tue Jan 18 16:11:35 2022 StephenDailyProgressCryo vacuum chamberStatus of Fastest Radiative Cooling run started 14 JanI ended the first cooldown of the run at
12:49 today, approximately 92 hours after
it had started. Workpiece temperature was
 5w_input_qil_cryostat_20220119.png5w_input_121_to_145_hours_qil_cryostat_20220124.png 
  2709   Fri Jan 21 13:28:48 2022 RadhikaDailyProgressCryo vacuum chamberHeat transfer between grease joints and pressure jointsI took a deep dive into Ekin 2.6 to understand heat
tranfer between various joint types, specifically pressure
joints and grease joints. This was motivated
 thermal_conductance_joints.png 
  2710   Fri Jan 21 17:32:40 2022 ranaDailyProgressCryo vacuum chamberHeat transfer between grease joints and pressure jointsIs there a units issue? 50 kg is a mass,
but not a force.
  
  2711   Tue Jan 25 10:24:14 2022 ranaDailyProgressCryo vacuum chamberHeat transfer between grease joints and pressure jointsFor one surface resting on another, the
force of the contact is the grativational
force of the top surface. There's an
  
  2712   Tue Jan 25 13:15:40 2022 ranaDailyProgressCryo vacuum chamberHeat transfer between grease joints and pressure jointsI think its least confusing to just replace
50 kg g with 500 N. Writing 50 g can be misleading,
it seems like 50 grams.
  
  2713   Tue Jan 25 14:01:27 2022 StephenDailyProgressCryo vacuum chamberHeat transfer between grease joints and pressure jointsThere's also a convention to write
"50 kgf" to designate "kilograms
of force" (implying the same conversion
  
  2714   Fri Jan 28 10:31:15 2022 ranaSummaryTutorial videooh no, stap the units madness, aaaaahhhh!!! noooooo!!!!    
  2715   Mon Jan 31 15:40:21 2022 StephenDailyProgress 31 Jan Fastest Radiative Cooling run startedAs discussed during the 21 Jan 2022 meeting,
the next cryostat run will seek the fastest
radiative cooling (again, see QIL/2706)
  
  2716   Fri Feb 4 14:00:19 2022 RadhikaDailyProgress 31 Jan Fastest Radiative Cooling run startedAttached are best fits for cooldown runs
on 01/14 and 01/31. The setup for both cooldowns
can be found in the previous ELOGs. We noticed
 Cooldown_0114_analyzed.pdfCooldown_0131_analyzed.pdfCooldown_0131_copperbar_halfR.pdfCooldown_0131_flexstrap_halfR.pdf 
  2717   Mon Feb 7 11:57:38 2022 StephenDailyProgressCryo vacuum chamberDoubled Thermal Linkage Capacity run started 11 Feb 2022[Stephen, Radhika]

The double copper bar configuration
pictured in Attachment 1 has been implemented.
 D2000310_y-004_section_double_linkage_20220207.png 
  2718   Mon Feb 7 16:06:36 2022 StephenDailyProgress 31 Jan Fastest Radiative Cooling run, ended 07 Jan[Radhika, Stephen]

The heater was turned on at 3:13pm
on Friday 2/4.
  
  2719   Wed Feb 9 15:21:27 2022 ranaHowtoTempCtrlplotsIn the plots comparing data and models,
can you use the legend to indicate which
is which? e.g. use dots for data and solid
  
  2720   Tue Feb 15 11:59:22 2022 RadhikaDailyProgressCryo vacuum chamberDoubled Thermal Linkage Capacity run started 11 Feb 2022*Note: The RTD spring-clamped to the cold
head gave spazzy readings for this cooldown,
so the last cooldown's cold head temperature
 Cu_bar_comparison.pdfcooldown_0211_all.pdf 
  2721   Tue Feb 15 16:54:27 2022 ranaDailyProgressCryo vacuum chamberDoubled Thermal Linkage Capacity run started 11 Feb 2022I've been assuming that the inner shield
can be treated as a point mass, but perhaps
the thinness make a significant delay between
  
  2722   Wed Feb 16 11:35:18 2022 StephenDailyProgressCryo vacuum chamberDoubled Thermal Linkage Capacity run started 11 Feb 2022[Stephen, Radhika]

The heater was turned on on Wed,
2/16 at 11:30am, with control setpoint 123K.
  
  2723   Tue Feb 22 07:53:06 2022 YehonathanUpdateWOPOWaking up WOPO{Shruti, Yehonathan}

On Friday, we came down to QIL
to poke around the WOPO setup. The first
  
  2724   Thu Feb 24 10:44:06 2022 RadhikaDailyProgressCryo vacuum chamberDouble copper bar cooldown rerun started 02/23[Radhika, Aaron]

The goals for this cooldown are:

 IMG_3095.jpgIMG_3096.jpgIMG_3083.jpgIMG_3087.jpgIMG_3092.jpg 
  2725   Fri Feb 25 17:09:53 2022 shrutiUpdateWOPOWaking up WOPO - green beam[shruti, yehonathan]

SHG and 532 nm beam alignment

Yehonathan
brought over 532nm/1064nm laser goggles from
  
  2726   Tue Mar 1 15:59:34 2022 RadhikaDailyProgressCryo vacuum chamberDouble copper bar cooldown rerun started 02/23The heater was turned on on Tue, 3/1 at
4pm, with control setpoint 123K.

*UPDATE: After checking a few hours
  
  2727   Wed Mar 2 14:38:55 2022 YehonathanUpdateWOPOWaking up WOPO - some more fiddling and a plan{Shruti, Yehonathan}

We made some a list of some random
questions and plans for the future. We then
  
  2728   Fri Mar 4 11:49:45 2022 shrutiUpdateWOPOWaking up WOPO - attempts at readout[Yehonathan, Shruti]

1. Doubling cavity and green beam

Since
we had left the lasers ON with the shutters
 LO_shot_noise.pdf 
ELOG V3.1.3-