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ID Date Author Type Category Subject Text Attachments
  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
  
  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
  
  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 
  2767   Wed May 11 15:53:06 2022 AidanLab InfrastructureCleanlinessCeiling tile replacement - Day 2Tiles are replaced.




 IMG_8806.jpgIMG_8807.jpgIMG_8803.jpg 
  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 
  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
  
  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 
  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 
  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.
  
  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 
  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
  
  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 
  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 
  
  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
  
  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:
  
  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
  
  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
  
  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
  
  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 
  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 
  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
  
  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 
  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.
  
  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?

 
  
  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
  
  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 
  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).
  
  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.

 
  
  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 
  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 
  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)
  
  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 
  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 
  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
  
  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 
  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 
  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 
  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 
  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
  
  2731   Thu Mar 10 17:12:01 2022 awadeUpdateWOPOWaking up WOPO - attempts at readout[awade]

Good to see this experiment being
revived.
  
  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 
  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 
  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 
  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
  
  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
  
  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
  
  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 
  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
  
  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.
  
  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
  
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