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New entries since:Wed Dec 31 16:00:00 1969
IDdown Date Author Type Category Subject Text Attachments
  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
  Draft   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.
  Draft   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​ and
  125   Thu Feb 2 17:28:37 2023 Sophia AdamsGeneralOptical ContactingTest of Temperature Reading of One Plate

The arduino was able to read temperature
  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.

  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
  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 
  121   Tue Jan 10 23:30:25 2023 KojiGeneralGeneralHeavy item transport - preparation[JC, Stephen, Paco, Gabriele, Aidan,
Radhika, Koji]

We have successfully extracted
  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
  119   Mon Jan 9 16:18:50 2023 Sophia AdamsGeneralOptical Contacting    arduinoRoomTempReading.jpg 
  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
  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
  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
  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
  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   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)
  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
  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
  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
  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
  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
  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
  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,
  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
  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
  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
  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
  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
  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
  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
  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
  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++).
  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
  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
  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
  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!
  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
  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,
  87   Sat Oct 1 23:00:03 2022 Jennifer HritzGeneralOptical Contacting(RESULTS!) Quick test heat and pressure testThese are the results from the previous
  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
  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
  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
  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
  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
  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
  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
  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
  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
  76   Tue Aug 16 09:58:23 2022 PacoGeneralDesign specsHR coating updateA couple of coating stacks with better
tolerance (transmission +- 10%). Attachments
#1-2 show the spectral reflectivities
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