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New entries since:Wed Dec 31 16:00:00 1969
ID Date Author Type Categoryup Subject Text Attachments
  65   Wed Jul 13 13:16:33 2022 JuanGeneralGeneralFinished coil driver and sat amp I have finished all coil driver and sat
amp chassis they all seem to be functioning
properly.
 IMG-5553.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
  
  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 
  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 
  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 
  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 
  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
  
  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 
  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 
  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
  
  32   Wed Sep 29 16:15:19 2021 RadhikaGeneralHeat LoadMariner cooldown model status + next stepsAttachment 1 is a geometric diagram that
reflects the current state of the ITM cooldown
model, introduced in [30].
 Heat_Load_Sketch_geometry.pdfHeat_Load_Sketch_diagram.pdfheating_cooling_P_vs_T.pdfCooldownTM_radiative.pdf 
  37   Tue Oct 5 17:46:14 2021 RadhikaGeneralHeat LoadMariner cooldown model status + next stepsBuilding on [32],
I added a copper cold finger to conductively
cool the inner shield, instead of holding
 Heat_Load_Sketch_all.pdfVaryingISA.pdfCooldownTM.pdf 
  42   Fri Oct 15 13:45:55 2021 RadhikaGeneralHeat LoadMariner cooldown model status + next stepsI used the same model in [37]
to consider how test mass length affects
the cooldown. Attachment 1 plots the curves
 VaryingTMl.pdf 
  43   Fri Oct 15 14:31:15 2021 RadhikaGeneralHeat LoadMariner cooldown model status + next stepsI reran the cooldown model, setting the
emissivity of the inner surface of the inner
shield to 0.7 (coating), and the emissivity
 VaryingISA.pdfVaryingTMl.pdf 
  79   Fri Aug 26 14:24:57 2022 RadhikaGeneralHeat LoadMariner TM Cooldown modelHere I describe the current radiative cooldown
model for a Mariner test mass, using parameters
from the most recent CAD model. A diagram
 6x 
  80   Mon Aug 29 15:44:46 2022 RadhikaGeneralHeat LoadMariner TM Cooldown modelHere is a more detailed analysis of varying
the length and radius of the snout.

Attachment 1 plots the heat load
 VaryingSnoutparams.pdfMarinerTMCooldown_snout_optimal.pdf 
  81   Wed Sep 7 10:42:12 2022 RadhikaGeneralHeat LoadMariner TM Cooldown modelThe attached plot (upper) compares the
heat load delivered to the test mass from
various snout lengths (end to end), as a
 SnoutLengthCooldownTM.pdf 
  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
  
  62   Mon Jul 11 16:24:31 2022 Jennifer HritzGeneralOptical ContactingBaselining the temperature output of the Oster hot plateThis was performed last Friday (7/8).

I secured a thermocouple perpendicular
against the hotplate and recorded the
 PXL_20220708_230038748.jpgPXL_20220708_230234841.MP.jpg 
  63   Mon Jul 11 17:27:39 2022 Jennifer HritzGeneralOptical ContactingFirst successful bondNote that the slides have "GLOBE"
printed on one side. I always bond the opposite
using the opposite side without the text.
 PXL_20220712_223449788.MP.jpg 
  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 
  71   Wed Jul 27 14:50:20 2022 Jennifer HritzGeneralOptical ContactingBonding without liquids and narrowing down heating issueI have found that, after cleaning the glass
with methanol (or even sometimes with just a dry
lense-cleaning cloth), I can get glass slides to
 PXL_20220727_214658230.jpgPXL_20220727_214241668.mp4 
  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 
  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 
  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 
  83   Wed Sep 28 22:11:31 2022 Jennifer HritzGeneralOptical ContactingLooked at Thor Lab slidesWhile finalizing my work plan for the quarter,
I decided to look at the Thor Lab slides.
This was instructive because they highlighted
 thor_lab_slides_first_bond_PXL_20220929_045352675.MP.jpgthor_lab_slides_after_attempting_to_expand_bond_area_PXL_20220929_045510075.MP.jpg 
  84   Thu Sep 29 18:36:40 2022 Jennifer HritzGeneralOptical ContactingLooked at Thor Lab slides (continued)Continuining with my casual exploration
of the Thor Lab slides, I heated them from
off --> low --> med --> high, with
 before_heat_PXL_20220930_011031420.MP.jpgset_up_PXL_20220930_011050114.MP.jpgright_after_heating_PXL_20220930_014301900.MP.jpgafter_4ish_hours_of_cooling_PXL_20220930_063533904.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 
  87   Sat Oct 1 23:00:03 2022 Jennifer HritzGeneralOptical Contacting(RESULTS!) Quick test heat and pressure testThese are the results from the previous
log.
 samples_before_AND_after_pressure_PXL_20221002_054158446.MP.jpgsamples_before_AND_after_heat_w_pressure_PXL_20221002_053842185.MP.jpg 
  88   Sun Oct 2 23:23:07 2022 Jennifer HritzGeneralOptical ContactingCause of improved bond: time or pressureBefore jumping to conclusions based on
my previous results, I wanted to check that
it was indeed heat and pressure, not time,
 before_time_on_left_pressure_on_right_PXL_20221003_061828860.MP.jpgset_up_time_vs_pressure_PXL_20221003_062018249.MP.jpgin_progress_time_vs_pressure_PXL_20221003_062117715.MP.jpg 
  89   Mon Oct 3 23:32:30 2022 Jennifer HritzGeneralOptical ContactingCause of improved bond: time or pressure (Update)I was unable to check the samples because
I could not get access to Bridge, so they
will be checked tomorrow and the results
 pressure_v_time_samples_both.jpg 
  90   Tue Oct 4 22:15:23 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM Test #1I wrote a program to control the heating
rate of the hot plate using Pulse Width Modulation
(PWM), and it was a great success!
 PWM_Test_#1_(first_300_sec).pdfframe_from_pwm_test1_video_PXL_20221005_064240498_exported_231444.jpg 
  91   Wed Oct 5 23:24:08 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM Test #2I repeated the first test, but let the
hot plate run longer. It revealed that the
linearity for the lower temperatures completely
 PWM_Test_#2.pdfPWM_Test_#2_(comparison).pdf 
  92   Fri Oct 7 00:21:24 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM Test #3The previous test was cycled with 0.3s
on follwed by 0.7s off*. This test was 0.7s
on followed by 0.3s off. I intended to let
 PWM_Test_#3.pdfPWM_Test_#3_(comparison).pdfhot_plate_cycler_v1.zipPWM_tests_1-3.zip 
  93   Fri Oct 7 21:20:08 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM v2 progressI had a little set back regarding the non-linear
portion of the heating. After about 150°C,
if the heating rate is kept constant, the
 PWM_Test_#2_(log_comparison).pdfPWM_Test_#3_(log_comparison).pdf 
  94   Sat Oct 8 23:22:25 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM v2 test #1I had some trouble with the code not working
as intended (partially because it has been
I while since I coded in C++).
 PWM_v2_Test_#1.pdf 
  95   Sun Oct 9 21:55:53 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM v2 test #1 & 2For the following two graphs, I ram
four tests: two using the the v1 of the PWM
code and two using v2 of the PWM code. The
 PWM_v2_Test_#1_-_increase_180°C_in_10_minutes.pdfPWM_v2_Test_#2_-_increase_180°C_in_7_minutes.pdf 
  96   Mon Oct 10 15:34:13 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM v2.1,2,3 Test #1 and v2.3 Test #2Before trying the PWM on actual samples,
I wanted to make one final attempt at improving
my code (labled as v2.1). This change
 PWM_v2.1_test1_max_rate_reached_and_peak_heat.jpg 
  97   Tue Oct 11 23:59:07 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM v2.3 Test #1 and 2Here are the graphed results from
yesterday's tests, both by themselves
and overlayed with the previous tests. I
 PWM_v2.3_Test_#1_-_increase_180°C_in_10_minutes.pdfPWM_v2.3_Test_#2_-_increase_180°C_in_7_minutes.pdfPWM_v2_Test_#1_-_increase_180°C_in_10_minutes.pdfPWM_v2_Test_#2_-_increase_180°C_in_7_minutes.pdf 
  98   Wed Oct 12 23:26:48 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM v2.3 Test #3I tried increasing the temperature by 180°C
over 20 minutes. As suspected, it did not
quite reach the target temperature because
 PWM_v2.3_Test_#3_-_increase_180°C_in_20_minutes.pdf 
  99   Thu Oct 13 20:56:48 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM v2.4,5 Test #3My two corrections ended up being huge
overshoots. The drop off time (100°C)
is correct, but the default rate increase
 PWM_v2.3_Test_#3_-_increase_180C_in_20_minutes.pdf 
  100   Fri Oct 14 21:36:52 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM v2.6 Test #3The goal of "v2.X test #3" is
to heat the hot plate to 200°C over the
course of 20 minutes, and with v2.6, I have
 PWM_v2_Test_#3_-_increase_180°C_in_20_minutes.pdfPWM_v2.6_Test_#3_-_increase_180°C_in_20_minutes.pdfcycler_v1_graphs.zipcycler_v2_graphs.ziphot_plate_cycler_v1-2.6.zip 
  101   Sat Oct 15 21:59:13 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM v2.6 Test #1, 2, 3I realized that, after changing so much
from v2.3 to 6, I should check that my first
two tests produce correct results with the
 PWM_v2.6_Test_#1_2_3_-_increase_180C_in_10_7_20_minutes.pdfPWM_v2.6_tests_data.zip 
  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 
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