| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
65
|
Wed Jul 13 13:16:33 2022 |
Juan | General | General | Finished coil driver and sat amp | I have finished all coil driver and sat
amp chassis they all seem to be functioning
properly. |
|
|
69
|
Fri Jul 22 13:47:47 2022 |
Juan | General | General | Update | Just 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 |
Juan | General | General | OSEMS 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 |
Juan | General | General | Sat Amp | Sat 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 |
Juan | General | General | Sat Amp testing of OSEMS | In 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 | General | General | Update on Sat Amp and OSEMs | Sat
Amp
|
|
|
117
|
Sat Jan 7 16:07:13 2023 |
| General | General | | 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 |
Koji | General | General | Heavy item transport - preparation | 1) 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 |
|
|
121
|
Tue Jan 10 23:30:25 2023 |
Koji | General | General | Heavy item transport - preparation | [JC, Stephen, Paco, Gabriele, Aidan,
Radhika, Koji]
We have successfully extracted |
|
|
122
|
Thu Jan 12 11:38:26 2023 |
Koji | General | General | How to move the large engine hoist through the narrow door | See the attachments. |
|
|
123
|
Thu Jan 12 11:54:08 2023 |
Koji | General | General | Heavy 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 |
Koji | General | General | Crane configuration for the suspension test chamber | I made a quick investigation of the crane
configuration for the suspension test chamber.
Conclusions: |
|
|
138
|
Fri Aug 25 13:25:05 2023 |
Radhika | General | General | Summary of JPL/Ball cryocooler discussion | Here is a summary of the cryocooler discussion
hosted at JPL.
Dave Glaister of Ball Aerospace |
|
|
3
|
Fri Jun 5 11:13:50 2020 |
Raymond | General | Heat Load | Steady state heat load example | Attached is a cartoon partial view into
the heat load experienced by the Mariner
assembly. |
|
|
30
|
Fri Sep 24 13:12:00 2021 |
Radhika | General | Heat Load | Mariner 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 |
rana | General | Heat Load | Mariner cooldown model status + next steps | How
about a diagram so that we can understand |
|
|
32
|
Wed Sep 29 16:15:19 2021 |
Radhika | General | Heat Load | Mariner cooldown model status + next steps | Attachment 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 |
Radhika | General | Heat Load | Mariner cooldown model status + next steps | Building 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 |
Radhika | General | Heat Load | Mariner cooldown model status + next steps | I 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 |
Radhika | General | Heat Load | Mariner cooldown model status + next steps | I 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 |
Radhika | General | Heat Load | Mariner TM Cooldown model | Here 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 |
Radhika | General | Heat Load | Mariner TM Cooldown model | Here 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 |
Radhika | General | Heat Load | Mariner TM Cooldown model | The attached plot (upper) compares the
heat load delivered to the test mass from
various snout lengths (end to end), as a |
|
|
128
|
Wed Apr 12 12:03:34 2023 |
Radhika | General | Heat Load | Mariner TM Cooldown model | Here we lay out the Mariner cryocooler
requirements and discuss the most recent
cooldown model, which includes a cryocooler that cools |
|
|
129
|
Fri Jun 2 11:31:29 2023 |
Radhika | General | Heat Load | Mariner TM Cooldown model | Summarizing the current Mariner ITM cooldown
model assumptions:
- Inner shield and outer shield |
|
|
130
|
Fri Jun 23 15:37:39 2023 |
Radhika | General | Heat Load | Mariner TM Cooldown model | I simulated the Mariner cooldown with an
additional
LN2 tank connected to the main cold strap |
|
|
132
|
Fri Aug 4 17:07:41 2023 |
Radhika | General | Heat Load | Mariner TM Cooldown model | Here is the model including an additional
LN2 tank aiding in inner shield cooldown, |
|
|
60
|
Thu Jul 7 15:20:04 2022 |
rana | General | Optical Contacting | some useful links | For 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 Hritz | General | Optical Contacting | Baselining the temperature output of the Oster hot plate | This 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 Hritz | General | Optical Contacting | First successful bond | Note 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 Hritz | General | Optical Contacting | Testing isopropanol and methanol | Note 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 Hritz | General | Optical Contacting | Bonding without liquids and narrowing down heating issue | I 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 Hritz | General | Optical Contacting | Success with slowly heating | Yesterday, 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 Hritz | General | Optical Contacting | Razor blade test | We 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 Hritz | General | Optical Contacting | Razor test apparatus disassembly pictures | Pictures of the razor test apparatus before
and after disassembly, to make future reassembly
easier. |
|
|
83
|
Wed Sep 28 22:11:31 2022 |
Jennifer Hritz | General | Optical Contacting | Looked at Thor Lab slides | While 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 Hritz | General | Optical Contacting | Looked 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 Hritz | General | Optical Contacting | Quick test heat and pressure test | Given 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 Hritz | General | Optical Contacting | (RESULTS!) Quick test heat and pressure test | These are the results from the previous
log.
|
|
|
88
|
Sun Oct 2 23:23:07 2022 |
Jennifer Hritz | General | Optical Contacting | Cause of improved bond: time or pressure | Before 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 Hritz | General | Optical Contacting | Cause 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 Hritz | General | Optical Contacting | Hot plate PWM Test #1 | I 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 Hritz | General | Optical Contacting | Hot plate PWM Test #2 | I 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 Hritz | General | Optical Contacting | Hot plate PWM Test #3 | The 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 Hritz | General | Optical Contacting | Hot plate PWM v2 progress | I 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 Hritz | General | Optical Contacting | Hot plate PWM v2 test #1 | I 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 Hritz | General | Optical Contacting | Hot plate PWM v2 test #1 & 2 | For 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 Hritz | General | Optical Contacting | Hot plate PWM v2.1,2,3 Test #1 and v2.3 Test #2 | Before 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 Hritz | General | Optical Contacting | Hot plate PWM v2.3 Test #1 and 2 | Here 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 Hritz | General | Optical Contacting | Hot plate PWM v2.3 Test #3 | I tried increasing the temperature by 180°C
over 20 minutes. As suspected, it did not
quite reach the target temperature because |
|