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ID Date Author Type Category Subjectdown Text Attachments
  60   Thu Jul 7 15:20:04 2022 ranaGeneralOptical Contactingsome useful linksFor our optical contacting, Jennifer and
I are starting out with glass (microscope
slides), with the setup in the EE shop next
  
  114   Thu Oct 27 22:12:21 2022 ranaGeneralOptical Contactingplotting and PIDThe Arduino / AC PWM interface looks good.
I recommend that you maintain the code in
GitHub and post a link to the repo whenever
  
  58   Tue Jul 5 21:06:47 2022 JuanGeneralGeneralWork Update Update of my current work I have finished
one coil driver board and started on the
last two that I need here is the progress
 IMG-5362.jpgIMG-5361.jpg 
  106   Thu Oct 20 22:43:05 2022 Jennifer HritzGeneralOptical ContactingWired the thermocouples backwardsSince the two devices are giving different
temperature readings, I would like to find
out if this imprecision is linear (e.g. they
 wrong_correct_polarization_PXL_20221022_054250498_20221022_055117337.MP.jpg 
  75   Mon Aug 15 16:37:51 2022 Juan GeneralGeneralUpdate on Sat Amp and OSEMsSat
Amp 

 IMG-6458.jpgIMG-6355.jpgIMG-6459.jpgIMG-6460.jpgOSEMdata.png 
  59   Thu Jul 7 10:23:04 2022 JuanGeneralGeneralUpdate Almost done with coil driver boards   IMG-5378.jpgIMG-5379.jpg 
  69   Fri Jul 22 13:47:47 2022 JuanGeneralGeneralUpdateJust a general update of what I have been
up to deriving Lagrange for double pendulum
system and also been looking at code that
  
  20   Fri Aug 6 04:34:43 2021 KojiGeneralGeneralTheoretical Cooling Time LimitI was thinking about how fast we can cool
the test mass. No matter how we improve the
emissivity of the test mass and the cryostat,
 cooling_curves.pdf 
  105   Wed Oct 19 21:51:10 2022 Jennifer HritzGeneralOptical ContactingThe trials and tribulations of the thermocouplesI intended to test the new thermocouple
set up today, but when I plugged them in,
both did not read a temperature. It took
 thermocouple_connector_test_ciruit_PXL_20221020_035719119.MP.jpgcorrect_assembly_PXL_20221020_042855181.MP.jpgresistance_through_broken_and_fixed_connector_PXL_20221020_035951538_20221020_041939698.MP.jpgbroken_and_fixed_thermocouple_PXL_20221020_042242792_20221020_042201775.MP.jpgthermocouples_and_thermometers_room_temp.zip 
  66   Thu Jul 14 14:55:01 2022 Jennifer HritzGeneralOptical ContactingTesting isopropanol and methanolNote that I am just testing out different
techniques, so I have not set up the thermocouples
to precisely measure the temperatue.
 PXL_20220714_220953206.MP_2.jpgPXL_20220714_220940258.MP_2.jpgPXL_20220714_222105409.jpgPXL_20220713_003923957.jpg 
  103   Mon Oct 17 23:17:25 2022 Jennifer HritzGeneralOptical ContactingTesting PWM code with actual samplesNow that I have (relatively) good PWM code,
I wanted to do my first real test with actual
samples. Since everything went smoothly,
 first_real_PWM_test_samples_before_PXL_20221018_071840794.MP.jpgfirst_real_PWM_test_set_up_PXL_20221018_071943406.MP.jpgfirst_real_PWM_test_in_action_PXL_20221018_072832135.mp4 
  16   Tue Jun 22 22:28:09 2021 KojiGeneralDesign specsTest Mass wedge designThe
ETM wedge of 0.5deg will allow us to separate
the AR reflections. We will be OK with the
 wedge.pdfLayout.pdfETM.pdfITM.pdf 
  53   Thu Jun 16 14:04:30 2022 JuanGeneralSuspensionTable for Mariner Suspension CryoToday we looked at possible locations for
where we will be setting up Mariner Suspension
and Cryo chamber. The first option was the
  
  54   Thu Jun 16 19:43:36 2022 KojiGeneralSuspensionTable for Mariner Suspension Cryo- B246/QIL Skyhook


Find the base of Skyhook.
It should be in the storage room (B246).
  
  55   Thu Jun 23 21:11:03 2022 KojiGeneralSuspensionTable for Mariner Suspension CryoTable moving effort in the OMC lab: See
https://nodus.ligo.caltech.edu:8081/OMC_Lab/412

 
  
  34   Fri Oct 1 12:01:24 2021 PacoGeneralDesign specsTM Barrel coating emissivity[Paco, Nina, Aidan]

We ran our stack emissivity calculation
on different AR stacks to try and make a
 stack_1.pdfstack_2.pdfstack_3.pdfinterpolated_n_k.pdf 
  35   Fri Oct 1 13:24:40 2021 AidanGeneralDesign specsTM Barrel coating emissivityI have to question whether this passes
a sanity test. Surely in the case of Stack
2, the 10um thick Ta2O5 will absorb the majority
  
  36   Fri Oct 1 14:11:23 2021 PacoGeneralDesign specsTM Barrel coating emissivityAgree with this.
Quickly running tmm on the same "stacks"
gave the Attachment #1-3. (Ignore the
 stack_1.pdfstack_2.pdfstack_3.pdf 
  73   Thu Aug 4 13:44:56 2022 Jennifer HritzGeneralOptical ContactingSuccess with slowly heatingYesterday, I did two rounds of slowly heating
4 samples to the maximum hot plate temperature.
This was to formally test if my success
 PXL_20220803_232203193.jpgPXL_20220804_002433906.jpg 
  3   Fri Jun 5 11:13:50 2020 RaymondGeneralHeat LoadSteady state heat load exampleAttached is a cartoon partial view into
the heat load experienced by the Mariner
assembly.
 Heat_Load_Sketch.pdf 
  4   Thu Mar 4 17:04:52 2021 PacoGeneralDesign specsSilicon TM dichroic coatings for phase IHave been using the 40m
Coatings repo code by Gautam (with some
modifications to make dichroic designs under
 ETM_coating_candidates.pdfITM_coating_candidates.pdf 
  6   Wed Mar 17 19:51:42 2021 PacoGeneralDesign specsSilicon TM dichroic coatings for phase IUpdate on ETM

New optima are
being found using the same basic code with
some modifications, which I summarize below;
 ETM_R_210317_1927.pdfETM_Layers_210317_1927.pdfETM_nominal_cornerPlt.pdf 
  7   Wed Mar 17 21:24:27 2021 gautamGeneralDesign specsSilicon TM dichroic coatings for phase II guess you have tried it already - but
does enforcing the stacks to be repeating
bilayer pairs of the same thickness fail
  
  9   Wed Mar 24 17:42:50 2021 PacoGeneralDesign specsSilicon TM dichroic coatings for phase IYeah, the magnitudes are the inverse weighted
scalar costs (so they lie on the appropriate
relative scale) and indeed larger enclosed
  
  104   Tue Oct 18 19:33:38 2022 Jennifer HritzGeneralOptical ContactingSetting up thermocouplesFirstly, last night's heating did not
change the contacted surface area greatly,
but there is too many factors to speculate
 first_real_PWM_test_samples_before_after_PXL_20221018_080838426.MP.jpgK_Type_connector_PXL_20221019_000708969.MP.jpgthermocouple_plates_PXL_20221019_003002817.MP.jpg 
  23   Thu Aug 26 17:40:41 2021 StephenGeneralSuspensionSelecting MOS-style frame[Koji, Stephen]

Kind of a silly post, and not very
scientific, but we are sticking to it. During
 no_sos_cad_screenshot.pngvault_check_in_of_mariner_suspension_cad.png 
  74   Mon Aug 8 13:00:56 2022 JuanGeneralGeneralSat Amp testing of OSEMSIn the following test, a single Sat Amp
chassis that holds Sat Amp Board S1106078
and S1106077
 OSEMs.xlsx 
  72   Thu Aug 4 11:26:55 2022 JuanGeneralGeneralSat AmpSat amp seems to be working just fine.
There does seem to be a saturation issue
with one of the outputs we may need to change
 IMG-6153.jpg 
  102   Sun Oct 16 14:20:32 2022 Jennifer HritzGeneralOptical ContactingSamples after 2 weeks under pressureSince I was focusing on the hot plate code
and therefore did not need my weights, I
decided to leave them on top of my samples
 2_weeks_pressure_PXL_20221004_190652540_20221017_074745619.jpg 
  24   Thu Sep 9 11:25:30 2021 PacoGeneralDesign specsRerun HR coatings with n,k dispersion[Paco]

I've re-run the HR coating
designs for both ETM and ITM using interpolated
 etm_updated.pdfitm_updated.pdf 
  25   Thu Sep 9 20:42:34 2021 PacoGeneralDesign specsRerun HR coatings with n,k dispersion[Paco]

Alright, I've done a re-optimization
targetting a wider T band around 2128 nm.
 ETM210909190218.pdfITMLayers210909204021.pdf 
  82   Tue Sep 27 22:29:34 2022 Jennifer HritzGeneralOptical ContactingRazor test apparatus disassembly picturesPictures of the razor test apparatus before
and after disassembly, to make future reassembly
easier.
 razor_before_PXL_20220817_211123631.MP.jpgrazor_after_PXL_20220911_062818511.MP.jpg 
  77   Tue Aug 16 19:54:29 2022 Jennifer HritzGeneralOptical ContactingRazor blade testWe succeeded in setting up an apparatus
for quantifiying the razor blade test. After
mounting the glass slides such that
 PXL_20220817_023737796.MP.jpgPXL_20220817_023741865.MP.jpg 
  86   Fri Sep 30 21:51:31 2022 Jennifer HritzGeneralOptical ContactingQuick test heat and pressure testGiven that these glass slides are much
thinner than the ones I worked with prior,
I suspected they would be more receptive
 pressure_set_up_PXL_20221001_040539385.MP.jpgsamples_before_pressure_PXL_20221001_040441662.MP.jpgheat_w_pressure_set_up_PXL_20221001_033228622.MP.jpgsamples_before_heat_w_pressure_PXL_20221001_034620991.MP.jpg 
  57   Sat Jul 2 09:22:39 2022 Juan GeneralGeneralProgress update I've completed one coil driver board. 
Hopefully next week I can finish the
other 2 boards and make the modifications
 IMG-5220.jpg 
  108   Sat Oct 22 21:18:56 2022 Jennifer HritzGeneralOptical ContactingPWM v3.0With v3.0, I took a couple steps backwards
by getting rid of the feature that increases
the heating rate so I can isolate the base
 PWM_plates_-_increase_280C_in_10_minutes.pdf 
  107   Fri Oct 21 22:22:37 2022 Jennifer HritzGeneralOptical ContactingPWM v2.6 on new thermocouple set upI performed the same tests I have been
doing prior (+180°C in 10 minutes)
but now with the (correctly wired) thermocouples
 PWM_plates_-_increase_180C_in_10_minutes.pdf 
  Draft   Tue Oct 25 18:55:38 2022 Jennifer HritzGeneralOptical ContactingPWM 3.1 very slow heating[I'm behind on data processing, but
I'm creating an entry on the day I actually
run the tests]
  
  110   Mon Oct 24 21:23:22 2022 Jennifer HritzGeneralOptical ContactingPWM 3.1 longer off times in cycleTo combat the bottom plate heating up much
faster than the top plate, I decided to try
increasing the cycle period from 1000ms (1s)
 PWM_plates_-_1000_ms_on_9000_ms_off.pdf 
  112   Wed Oct 26 21:27:23 2022 JenniferGeneralOptical ContactingPWM 3.1 (more) very slow heating[I'm (once again) behind on data processing,
but I'm creating an entry on the day
I actually run the tests]
  
  109   Sun Oct 23 21:01:40 2022 Jennifer HritzGeneralOptical ContactingPWM 3.0 (+280C in 5)I decided test how fast the plates
would heat up if the heat was just on constantly
on for 5 minutes. In general, these tests
 PWM_plates_-_increase_280°C_in_5_minutes.pdf 
  13   Fri May 7 09:57:18 2021 StephenGeneralEquipmentOverall Dimensions for Mariner Suspension Test Chamber ConceptKoji, Stephen

Putting together Koji's design
work with Stephen's CAD, we consider
 mariner_suspension_test_chamber_concept.jpg 
  18   Wed Jul 7 16:32:27 2021 StephenGeneralEquipmentOverall Dimensions for Mariner Suspension Test Chamber ConceptWIP - Stephen to check on new suspension
dimensions and fit into 40m chamber
  
  2   Thu May 21 12:10:03 2020 StephenGeneralResourcesOngoing Mariner ResourcesOngoing points of updates/content (list
to be maintained and added)
Mariner
  
  70   Tue Jul 26 14:17:44 2022 JuanGeneralGeneralOSEMS actuators we have 23 OSEMS they look all full built
and I will try and test them this week and
or next week.
 8x 
  78   Tue Aug 23 17:10:50 2022 PacoGeneralDesign specsNew corner plotsInstead of varying individual layer thicknesses
using the MC sampler, I made sure both the
thickness and index of refractions are varied
 ITM_corner.pdfETM_corner.pdf 
  39   Tue Oct 12 12:44:44 2021 Jiri SmetanaGeneralGeneralNew Damping Loop ModelI've ironed out the issues with my
MATLAB model so that it now shows correct
phase behaviour. The problem seems to arise
  
  38   Mon Oct 11 15:22:18 2021 YehonathanGeneralGeneralMicrocomb alternativesFollowing our discussion at the Friday
JC meeting, I gathered several resources
and made a small simulation to show how frequency
 ELMO_specs.pngHNLF_specs.pngSimulationResults1.pngSimulationResults3.png 
  30   Fri Sep 24 13:12:00 2021 RadhikaGeneralHeat LoadMariner cooldown model status + next steps*Note: the current modeling script can
be found at: CryoEngineering/MarinerCooldownEstimation.ipynb

Nina pointed me to the current
  
  31   Mon Sep 27 17:01:53 2021 ranaGeneralHeat LoadMariner cooldown model status + next stepsHow
about a diagram so that we can understand
  
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