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New entries since:Wed Dec 31 16:00:00 1969
ID Date Author Type Categoryup Subject Text Attachments
  61   Fri Jul 8 17:09:10 2022 JuanGeneralGeneralCoil Driver and Sat AmpAll three coil driver boards are complete
and have been tested. Modification for all
4 sat amp have been completed. Ideally, I
  64   Mon Jul 11 17:39:17 2022 JuanGeneralGeneralCoil driver chassis Finished all 3 Coil Drover chassis
and power lines still need to install the
rear cables will do that after I finish Sat
  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
  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.
  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
  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
  75   Mon Aug 15 16:37:51 2022 Juan GeneralGeneralUpdate on Sat Amp and OSEMsSat

  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
  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].
  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
  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
  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
  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
  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
  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
  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
  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.
  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.
  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
  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
  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
  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
  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
  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
  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
  87   Sat Oct 1 23:00:03 2022 Jennifer HritzGeneralOptical Contacting(RESULTS!) Quick test heat and pressure testThese are the results from the previous
  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,
  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
  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!
  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
  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
  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
  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++).
  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
  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
  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
  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
  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
  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
  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
  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
  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,
  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
  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
  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
  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
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