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IDup Date Author Type Category Subject Text Attachments
  2729   Fri Mar 4 13:18:09 2022 RadhikaDailyProgressCryo vacuum chamberDouble copper bar cooldown rerun started 02/23Analysis of 02/24 cooldown data

Attachment 1 shows the cooldown
data for this run. Attachment 2 compares
 02-24_cooldown_data.pdf02-24_cooldown_data_comparison.pdfcooldown_0224_bestfit.pdf 
  2730   Thu Mar 10 16:21:11 2022 RadhikaDailyProgressCryo vacuum chamberInsulated outer shield cooldown started 3/10[Stephen, Radhika]

Our goal for this week's cooldown
was to tape peek sheets fully around the
 9x 
  2731   Thu Mar 10 17:12:01 2022 awadeUpdateWOPOWaking up WOPO - attempts at readout[awade]

Good to see this experiment being
revived.
  
  2732   Mon Mar 14 14:04:54 2022 RadhikaDailyProgressCryo vacuum chamberInsulated outer shield cooldown started 3/10The heater was turned on at 2:05PM 3/14,
with a setpoint of 123K.
The cryocooler was turned off at 10:50AM
  
  2733   Wed Mar 16 12:22:44 2022 YehonathanUpdateWOPOWaking up WOPO - attempts at readout{Shruti, Yehonathan}

Yesterday, we measured a bunch
of noises.
 Moku_Noise.pdfPD_Connected_no_light.pdfDiff_Channel.pdf 
  2734   Fri Mar 18 19:34:35 2022 RadhikaDailyProgressCryo vacuum chamberMegastat cooldown 3/18 - adding indium gaskets to copper bar jointsToday I opened up Megstat to add indium
in between the copper bar joints, with the
hopes of speeding up cooldown and informing
 8x 
  2735   Tue Mar 22 09:19:38 2022 shrutiUpdateWOPOWaking up WOPO - back to green path[Yehonathan, Shruti]

Yesterday we went back to fiddling
with the green path. Soon after opening the
 before_opt.jpgaround_waveguide.png 
  2736   Thu Mar 24 16:08:35 2022 RadhikaDailyProgressCryo vacuum chamberMegastat cooldown 3/18 - adding indium gaskets to copper bar jointsThe data from this cooldown is attached
(labeled 03/19 - UTC time), compared
to the run started on 03/10. In between these
 cooldown_0319_vs_0310.pdf 
  2737   Sat Mar 26 12:49:18 2022 StephenDailyProgressCryo vacuum chamberWarmup started, issue with steady state heating25 March 2022 (Friday) at 21:00, went to
QIL to start warmup.

 - Cryocooler was turned off
  
  2738   Mon Mar 28 14:29:22 2022 shrutiSafetyCleanlinessLab floodingWhen I went into QIL today there was a
lot of flooding from water dripping from
the ceiling at several places in the lab.
 Flooding.zip 
  2739   Mon Mar 28 16:09:57 2022 AidanSafetyCleanlinessLab floodingSome photos of affected areas in B265A
and B265B (elog shows some preview photos
- click on PDF for full set).
 Flood_in_sub-basement-20220328.pdf 
  2740   Mon Mar 28 18:00:43 2022 KojiSafetyCleanlinessLab floodingFlood photo album: https://photos.app.goo.gl/BZAG8DyQzFVTfMNz6
(This link is read-only who has no access
to the account)
  
  2741   Tue Mar 29 09:13:20 2022 AidanSafetyCleanlinessLab floodingFacilities placed a blower and dehumidifier
in B265B. I checked the airflow and the air
around the tables is comparitively still.
 IMG_8104.jpgIMG_8103.jpgIMG_8102.jpgIMG_8101.jpgIMG_8100.jpg 
  2742   Wed Mar 30 10:46:49 2022 RadhikaSafetyCleanlinessLab flooding[Radhika, Shruti]

This morning, facilities removed
all the porous ceiling panels that had been
 IMG_3227.jpegIMG_3228.jpegIMG_3234.jpegIMG_3233.jpegIMG_3231.jpeg 
  2743   Wed Mar 30 16:25:06 2022 KojiSafetyCleanlinessLab floodingMuddy Waters is not new, but if the facility
can fix it we'd take it.

 
  
  2744   Fri Apr 1 13:53:02 2022 RadhikaSafetyCleanlinessLab floodingFacilities will be returning on Monday
4/4 between 8-9 AM to remove all ceiling
panels above the workstations in B265B (QIL).
  
  2745   Mon Apr 4 17:05:20 2022 RadhikaSafetyCleanlinessLab floodingPictures attached. WS1 and WS2 have been
turned back on, since the replacement for
the ceiling panels will not arrive for another
 IMG_3298.jpegIMG_3299.jpegIMG_3300.jpeg 
  2746   Tue Apr 5 11:15:13 2022 RadhikaThings to BuyPurchasesNew optical table legs for north tableThe current QIL optical tables are Thor
Labs PTH503 (discontinued, replaced by PTH603
  
  2747   Tue Apr 5 12:20:09 2022 ranaThings to BuyPurchasesNew optical table legs for north tablewe don't really need Pneumatic legs.
How much for rigid legs?

 
  
  2748   Tue Apr 5 16:41:17 2022 RadhikaThings to BuyPurchasesNew optical table legs for north tableThe 13.5" rigid
legs would cost $1,891.
  
  2749   Tue Apr 5 16:47:46 2022 RadhikaDailyProgress Rerun of cooldown with indium gaskets in copper bar joints[Radhika, Stephen]

On Thursday 3/31 we opened up with
a goal to diagnose and fix the heater
 9x 
  2750   Wed Apr 6 10:31:55 2022 ranaDailyProgress Rerun of cooldown with indium gaskets in copper bar jointsI think this is a nice debugging find.
Its not very robust to use the workstations
as 24/7 script machines (as we have found
  
  2751   Fri Apr 8 14:28:05 2022 RadhikaDailyProgressEmissivity estimationSi wafer emissivity testingI've modeled the cooldown of a 2"
diameter and 4" diameter Si wafer in
Attachments 1 and 2, using the current Megastat
 Si_wafer_2in.pdfSi_wafer_4in.pdf 
  2752   Fri Apr 8 16:25:54 2022 StephenDailyProgress2um PhotodiodesRecovery of IR Labs dewar WIPQuick log describing effort to recover
leaky IR Labs dewar.

POC Steve Zoltowski - Stevez@irlabs.com
 IMG_1354.JPG 
  2753   Fri Apr 8 17:34:10 2022 StephenDailyProgressCryo vacuum chamberCooldown started, two copper bars; manual logging.Restart, without vacuum incursion, of cooldown
from QIL/2749.
Hopefully we pull data this time, via manual
  
  2754   Mon Apr 11 14:50:45 2022 ranaDailyProgressCryo vacuum chamberSi wafer emissivity testingthat's good. Can you from these models
estimate what the uncertainty will be on
the emissivity? i.e. by MCMC or otherwise
  
  2755   Fri Apr 15 11:44:41 2022 RadhikaDailyProgressCryo vacuum chamberCooldown started, two copper bars; manual logging.Since the heater seems to not be functional
once again (displaying N/A and no power output),
I proceeded to turn off the cryocooler so
  
  2756   Fri Apr 15 13:30:41 2022 RadhikaDailyProgressCDSCTC100 for Megastat not responding to Telnet[Radhika, Chris, Ian, Paco]

There are two CTC100s in QIL, so
we will use the following nicknames:
  
  2757   Mon Apr 18 12:02:36 2022 RadhikaDailyProgressEmissivity estimationPlan towards MCMC emissivity estimationBelow are the outlined steps towards building
an MCMC model for estimating the emissivity
of a surface inside Megastat, and determining
  
  2758   Wed Apr 20 00:00:39 2022 YehonathanLab InfrastructureGeneralPreparing for planned power outage{Yehonathan, Shruti}

We shut down the workstations and
the FBs by doing 
  
  2759   Wed Apr 20 00:12:12 2022 YehonathanUpdateWOPOStill figuring out the readout electronics and fixing of some stuff{Yehonathan, Shruti}

1. Grabbed 30Hz-3GHz HP spectrum
analyzer from the Cryolab. Installed it in
 20220419_153109.jpg20220419_164600.jpg20220419_184248.jpg20220419_184233.jpg 
  2760   Thu Apr 21 10:33:33 2022 shrutiUpdateWOPOStill figuring out the readout electronics and fixing of some stuff[Yehonathan, Shruti]

 

First we turned on the relevant
  
  2761   Fri Apr 22 13:58:09 2022 RadhikaDailyProgressEmissivity estimationPlan towards MCMC emissivity estimationI've used the following model of heat
transfer between a suspended Si sample (1)
and the inner shield (2) in Megastat:
 e_uncertainty_eIS.pdfe_uncertainty_CpSi.pdf 
  2762   Mon Apr 25 11:08:35 2022 YehonathanUpdateWOPOStill figuring out the readout electronics and fixing of some stuff{Shruti, Yehonathan}

We realized that the PD amp circuit
only requires a 5V DC supply so we try that.
  
  2763   Thu Apr 28 11:39:24 2022 JCElectronicsGeneralNetworkI checked the internet in the TCS/MD Lab
and it is running great and the switch is
runing properly.
 IMG_0671.jpeg 
  2764   Thu Apr 28 14:12:20 2022 YehonathanUpdateWOPOStill figuring out the readout electronics and fixing of some stuff{Shruti, Yehonathan}

We went to the e-shop to investigate
the PD circuits. Completely confused about
 JustTIR.pdfTIR_WithCapacitors.pdfOnlyV_plus.pdf 
  Draft   Mon May 9 09:45:17 2022 StephenDailyProgress2um PhotodiodesRecovery of IR Labs dewar WIP[Jordan, Jancarlo, Stephen, Radhika]

The Helium leak testing setup from
the 40m Bake Lab was transported to WB B265B
  
  2766   Tue May 10 14:27:26 2022 AidanLab InfrastructureCleanlinessCeiling tile replacement - Day 1Henry from the Carpentry Shop has started
replacing ceiling tiles. They need to be
cut to fit each location. There was a lot
 IMG_8782.jpg 
  2767   Wed May 11 15:53:06 2022 AidanLab InfrastructureCleanlinessCeiling tile replacement - Day 2Tiles are replaced.




 IMG_8806.jpgIMG_8807.jpgIMG_8803.jpg 
  2768   Fri May 13 09:12:14 2022 RadhikaDailyProgressEmissivity estimationPlan towards MCMC emissivity estimationI've now used the following model of
heat transfer between a suspended Si sample
(1), inner shield (2), and aperture
 e1_eval_uncertainty_TM.pdfe1_eval_uncertainty_wafer.pdfe1_posterior_TM.pdfe1_posterior_wafer.pdf 
  2769   Wed May 18 09:42:34 2022 RadhikaDailyProgressEmissivity estimationMegastat Inner Shield for emissivity estimation[Radhika, JC]

In order to avoid having to order
a new inner shield for emissivity estimation
 9x 
  2770   Wed May 18 21:53:31 2022 ranaDailyProgressEmissivity estimationMegastat Inner Shield for emissivity estimationI'd recommend drilling a through hole
and using a nut, rather than tapping as I
suggested earlier. The shield is not thick
  
  2771   Fri May 20 11:08:16 2022 RadhikaDailyProgressEmissivity estimationMegastat Inner Shield for emissivity estimationThe results from tapping are in the previous
entry, and it seemed to work well. As for
the emissivity of the inner surface, it would
  
  2772   Wed May 25 14:32:12 2022 RadhikaSummaryEmissivity estimationList of Megastat upgrades for emissivity estimationThis post will serve as a running list
of modifications for Megastat for emissivity
estimation (brain dump). It is divided into
  
  2773   Thu May 26 13:12:25 2022 RadhikaSummaryEmissivity estimationList of Megastat upgrades for emissivity estimationI think this flashlight
would work

  
  2774   Fri May 27 13:30:21 2022 RadhikaDailyProgressEmissivity estimationSi wafer emissivity testingI modeled the cooldown of a 2" Si
wafer in Megastat with cooling from a) the
existing cryocooler and b) LN2. The
 cryocooler_vs_LN2_wafer.pdf 
  2775   Fri May 27 17:33:24 2022 RadhikaSummaryEmissivity estimationList of Megastat upgrades for emissivity estimation[Stephen, Radhika]

Today we further discussed ideas
for the enclosure, suspension/support, and
 IMG_3493.jpegIMG_3494.jpegIMG_3492.jpegIMG_1633.jpeg 
  2776   Tue May 31 17:53:07 2022 ranaDailyProgressEmissivity estimationSi wafer emissivity testingthat's a good start, but we want the
cooldown to be fast, so what we would need
from the model is for you to change some
  
  2777   Thu Jun 2 10:28:26 2022 YehonathanUpdateWOPOInstalling 1811 PDs[Shruti, Yehonathan]

We took newport 1811
PDs, one from CTN lab (suspicious) and one
  
  2778   Mon Jun 6 09:45:58 2022 RadhikaDailyProgressEmissivity estimationMegastat cooldown - repainted inner shield aquadag, added aquadag foil to cold plate[Stephen, Radhika, Hiya]

This entry describes efforts towards
the most recent Megastat cooldown with: 
 6x 
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