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IDup Date Author Type Category Subject Text Attachments
  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 
  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 
  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 
  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 
  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 
  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 
  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 
  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 
  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 
  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]
  
  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]
  
  Draft   Thu Oct 27 19:54:20 2022 Jennifer Hritz   Somehow I never thought of this before,
but instead of increasing the "on"
time of the hot plate to account for the
  
  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
  
  117   Sat Jan 7 16:07:13 2023 GeneralGeneral The bond quality measurements can be split
into two categories: destructive and nondestructive.
For destructive, we have measuring tensile
  
  118   Sat Jan 7 17:08:47 2023 Sophia AdamsGeneralOptical Contacting I am getting started on building the arduino
circuit as well as setting up my computer
so I can communicate between jupyter notebook
  
  119   Mon Jan 9 16:18:50 2023 Sophia AdamsGeneralOptical Contacting    arduinoRoomTempReading.jpg 
  120   Mon Jan 9 21:03:53 2023 KojiGeneralGeneralHeavy item transport - preparation1) Paco cleared the path in the DOPO lab.
We'll need a flat dolly or wooden bars
(covered with a mylar sheet) to place the
 DOPO.jpgCAML.jpgQIL.jpg 
  121   Tue Jan 10 23:30:25 2023 KojiGeneralGeneralHeavy item transport - preparation[JC, Stephen, Paco, Gabriele, Aidan,
Radhika, Koji]

We have successfully extracted
 PXL_20230110_214532535.jpgPXL_20230110_221731553.jpgPXL_20230110_222947057.MP.jpg 
  122   Thu Jan 12 11:38:26 2023 KojiGeneralGeneralHow to move the large engine hoist through the narrow doorSee the attachments.  PXL_20230110_223009017.jpgPXL_20230110_223015483.MP.jpgPXL_20230110_223026446.MP.jpgPXL_20230110_223035480.MP.jpg 
  123   Thu Jan 12 11:54:08 2023 KojiGeneralGeneralHeavy item transport[JC, Koji]

Caltech transport came in this
morning. They first went to the OMC lab and
 7x 
  124   Thu Jan 12 15:36:22 2023 KojiGeneralGeneralCrane configuration for the suspension test chamberI made a quick investigation of the crane
configuration for the suspension test chamber.

Conclusions:
 crane_config.pdf 
  125   Thu Feb 2 17:28:37 2023 Sophia AdamsGeneralOptical ContactingTest of Temperature Reading of One Plate

The arduino was able to read temperature
 bokeh_plot.pngIMG_3135.jpg 
  126   Mon Feb 6 15:36:39 2023 Jennifer HritzGeneralOptical ContactingPapers on making Q measurements of bondsUpper limits on the mechanical
loss of silicate bonds in a silicon tuning
fork oscillator​
  
  127   Fri Mar 24 20:27:46 2023 Jennifer HritzGeneralOptical ContactingControlling hot plate and recording temperature with one ArduinoPreviously, we had one Arduino taking the
two thermocouple readings and another, separate
one controlling the PWM of the hot plate.
 one_arduino_to_rule_them_all.png 
  128   Wed Apr 12 12:03:34 2023 RadhikaGeneralHeat LoadMariner TM Cooldown modelHere we lay out the Mariner cryocooler
requirements and discuss the most recent
cooldown model, which includes a cryocooler that cools
 MarinerTMCooldown_LN2_OS.pdfTMPowerBudget.pdfmariner_block_diagram_joints.pdf 
  129   Fri Jun 2 11:31:29 2023 RadhikaGeneralHeat LoadMariner TM Cooldown modelSummarizing the current Mariner ITM cooldown
model assumptions:

- Inner shield and outer shield
 MarinerITMCooldown_2023-05-31_ref.pdfMarinerTMPowerBudget.pdfMarinerTotalCoolingPower.pdfMariner_ITM_SUS_blockdiagram4.pdf 
  130   Fri Jun 23 15:37:39 2023 RadhikaGeneralHeat LoadMariner TM Cooldown modelI simulated the Mariner cooldown with an
additional
LN2 tank connected to the main cold strap
 MarinerCooldown_withLN2.pdfMarinerITMCooldown_halfCstrapL.pdf 
  131   Mon Jun 26 13:53:40 2023 Sophia AdamsGeneralOptical Contactingcantilever geometry to find the quality factor of a silicon bondI am trying to design a cantilever setup
to find the quality factor of optically bonded
silicon. The cantilever will be given an
 Picture1.jpg 
  132   Fri Aug 4 17:07:41 2023 RadhikaGeneralHeat LoadMariner TM Cooldown modelHere is the model including an additional
LN2 tank aiding in inner shield cooldown,
 VoyagerITMCooldown_with_LN2.pdfVoyagerITMCooldown_2023-05-31_ref.pdf 
  133   Tue Aug 22 10:16:54 2023 Sophia AdamsGeneralOptical ContactingMatlab fminsearch Cantilever Geometry OptimizationI am trying to use fminsearch to find the
best cantilever dimensions to maximize the
bond/cantilever energy ratio. Fminsearch
 getEnergy.mgetRatio.mfminSearch.m 
  134   Tue Aug 22 12:12:05 2023 Sophia AdamsGeneralOptical ContactingMatlab fminsearch Cantilever Geometry OptimizationThe code works now. If the function is
specified by a file, there should be an @
symbol front of it when it is passed into
  
  135   Tue Aug 22 13:14:22 2023 Sophia AdamsGeneralOptical ContactingMatlab fminsearch Cantilever Geometry OptimizationRestricting the search to nothing less
than the initial parameters (L = 2 cm, h
= 0.3 mm, d = 0.55 mm), fminsearch outputs
  
  136   Wed Aug 23 11:13:58 2023 Sophia AdamsGeneralOptical ContactingMatlab fminsearch Cantilever Geometry OptimizationI am trying to get a plot of the fminsearch
data, but I was not sure how to extract the
data. But fminsearch has built in plots that
 fminsearch_fvalplot.figfminsearch_graph.pdf 
  137   Wed Aug 23 16:34:47 2023 Sophia AdamsGeneralOptical ContactingMatlab Cantilever Geometry OptimizationHere is the code to generate a random list
of parameters and evaluate the energy ratio
of each. 
 optimizingParameters.mRectangularCantilever.mph 
  138   Fri Aug 25 13:25:05 2023 RadhikaGeneralGeneralSummary of JPL/Ball cryocooler discussionHere is a summary of the cryocooler discussion
hosted at JPL. 

Dave Glaister of Ball Aerospace
  
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