| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
7
|
Wed Mar 17 21:24:27 2021 |
gautam | General | Design specs | Silicon TM dichroic coatings for phase I | I guess you have tried it already - but
does enforcing the stacks to be repeating
bilayer pairs of the same thickness fail |
|
|
38
|
Mon Oct 11 15:22:18 2021 |
Yehonathan | General | General | Microcomb alternatives | Following our discussion at the Friday
JC meeting, I gathered several resources
and made a small simulation to show how frequency |
|
|
2
|
Thu May 21 12:10:03 2020 |
Stephen | General | Resources | Ongoing Mariner Resources | Ongoing points of updates/content (list
to be maintained and added)
Mariner |
|
|
5
|
Fri Mar 5 11:05:13 2021 |
Stephen | General | Design specs | Feasibility of 6" optic size in CAD | 6" vs 4" optic size comparison
using CAD - worth hopping into the 3D geometry
using the link below, but also posting a |
|
|
13
|
Fri May 7 09:57:18 2021 |
Stephen | General | Equipment | Overall Dimensions for Mariner Suspension Test Chamber Concept | Koji, Stephen
Putting together Koji's design
work with Stephen's CAD, we consider |
|
|
Draft
|
Wed Jun 30 16:21:53 2021 |
Stephen | General | Design specs | | [Stephen, Koji]
WIP - check layout of 60 cm suspension
in chamber at 40m, will report here |
|
|
18
|
Wed Jul 7 16:32:27 2021 |
Stephen | General | Equipment | Overall Dimensions for Mariner Suspension Test Chamber Concept | WIP - Stephen to check on new suspension
dimensions and fit into 40m chamber |
|
|
23
|
Thu Aug 26 17:40:41 2021 |
Stephen | General | Suspension | Selecting MOS-style frame | [Koji, Stephen]
Kind of a silly post, and not very
scientific, but we are sticking to it. During |
|
|
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 |
|
|
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 |
|
|
4
|
Thu Mar 4 17:04:52 2021 |
Paco | General | Design specs | Silicon TM dichroic coatings for phase I | Have been using the 40m
Coatings repo code by Gautam (with some
modifications to make dichroic designs under |
|
|
6
|
Wed Mar 17 19:51:42 2021 |
Paco | General | Design specs | Silicon TM dichroic coatings for phase I | Update on ETM
New optima are
being found using the same basic code with
some modifications, which I summarize below; |
|
|
8
|
Wed Mar 24 17:36:46 2021 |
Paco | General | Design specs | Least common multiple stacks and varL cost | Update on ETM/ITM coating design;
-
Following what seemed like a good, intuitive
suggestion from Anchal, I implemented a parameter |
|
|
9
|
Wed Mar 24 17:42:50 2021 |
Paco | General | Design specs | Silicon TM dichroic coatings for phase I | Yeah, the magnitudes are the inverse weighted
scalar costs (so they lie on the appropriate
relative scale) and indeed larger enclosed |
|
|
10
|
Fri Apr 2 19:59:53 2021 |
Paco | General | Design specs | Differential evolution strategies | Differential evolution strategies 'benchmarking'
for thin film optimization
Since
I have been running the ETM/ITM coatings |
|
|
15
|
Fri Jun 4 11:09:27 2021 |
Paco | General | Design specs | HR coating tolerance analysis | The HR coating specifications are:
ETM |
|
|
19
|
Tue Jul 27 11:38:25 2021 |
Paco | General | Design specs | DOPO single pass PDC efficiency | Here is a set of curves describing the
single-pass downconversion efficiency in
the 20 mm long PPKTP crystals for the DOPO. |
|
|
24
|
Thu Sep 9 11:25:30 2021 |
Paco | General | Design specs | Rerun HR coatings with n,k dispersion | [Paco]
I've re-run the HR coating
designs for both ETM and ITM using interpolated |
|
|
25
|
Thu Sep 9 20:42:34 2021 |
Paco | General | Design specs | Rerun HR coatings with n,k dispersion | [Paco]
Alright, I've done a re-optimization
targetting a wider T band around 2128 nm. |
|
|
28
|
Sun Sep 19 18:52:58 2021 |
Paco | General | Design specs | HR coating emissivity | [Paco, Nina]
We have been working on an estimate
of the wavelength dependent emissivity for |
|
|
33
|
Fri Oct 1 11:52:06 2021 |
Paco | General | Design specs | HR coating emissivity | [Paco, Nina, Aidan]
Updated the stack emissivity code
to use the Kitamura paper fused silica dispersion |
|
|
34
|
Fri Oct 1 12:01:24 2021 |
Paco | General | Design specs | TM Barrel coating emissivity | [Paco, Nina, Aidan]
We ran our stack emissivity calculation
on different AR stacks to try and make a |
|
|
36
|
Fri Oct 1 14:11:23 2021 |
Paco | General | Design specs | TM Barrel coating emissivity | Agree with this.
Quickly running tmm on the same "stacks"
gave the Attachment #1-3. (Ignore the |
|
|
47
|
Fri Nov 5 11:51:50 2021 |
Paco | General | Design specs | Estimate of in-air absorption near 2.05 um | [Paco]
I used the HITRAN database to download
the set of ro-vibrational absorption lines |
|
|
48
|
Tue Nov 16 11:47:54 2021 |
Paco | General | Design specs | Estimate of in-air absorption near 2.05 um | [Paco]
There was an error in the last
plot of the previous log. This was correctly |
|
|
12
|
Tue Apr 27 12:28:43 2021 |
Nina Vaidya & Shruti Maliakal | General | Design specs | Arm Cavity Design 2021 | Rana’s code: R_c = 57.3
-->New code with optimization:
sweeping through a range of R_c, using a |
|
|
14
|
Fri May 7 17:50:31 2021 |
Nina Vaidya & Shruti Maliakal | General | Design specs | Arm Cavity Design 2021 update | Here are the final slides with all the
results on the Arm Cavity Design, please
review. |
|
|
1
|
Thu May 21 11:51:44 2020 |
Koji | General | General | Mariner Elog Test | The first entry of the Mariner elog post |
|
|
16
|
Tue Jun 22 22:28:09 2021 |
Koji | General | Design specs | Test Mass wedge design | The
ETM wedge of 0.5deg will allow us to separate
the AR reflections. We will be OK with the |
|
|
20
|
Fri Aug 6 04:34:43 2021 |
Koji | General | General | Theoretical Cooling Time Limit | I was thinking about how fast we can cool
the test mass. No matter how we improve the
emissivity of the test mass and the cryostat, |
|
|
21
|
Tue Aug 17 17:48:57 2021 |
Koji | General | Equipment | Crackle SW model | As a kickoff of the mariner sus cryostat
design, I made a tentative crackle chamber
model in SW. |
|
|
29
|
Fri Sep 24 11:02:41 2021 |
Koji | General | General | Actuation Feedback Model and Noise | We had a meeting with the code open in
ZOOM. Here are some points we discussed:
The code requires another |
|
|
45
|
Wed Nov 3 02:52:49 2021 |
Koji | General | Suspension | Mariner Sus Design | All parameters are temporary:
Test mass size: D150mm x L140mm
Intermediate mass size W152.4mm x |
|
|
46
|
Thu Nov 4 00:42:05 2021 |
Koji | General | Suspension | Mariner Sus Design | Some more progress:
- Shaved the height of the top
clamp blocks. We can extend the suspension |
|
|
22
|
Tue Aug 24 08:15:37 2021 |
Jiri Smetana | General | General | Actuation Feedback Model | I'm posting a summary of the work I've
done on the Lagrangian analysis of the Mariner
suspension design and a state space model |
|
|
26
|
Wed Sep 15 09:15:21 2021 |
Jiri Smetana | General | General | Actuation Feedback Model and Noise | I've implemented a more extensive feedback
model that uses proper conversions between
metres, volts, counts etc. and includes all |
|
|
27
|
Thu Sep 16 10:02:47 2021 |
Jiri Smetana | General | General | Actuation Feedback Model and Noise | Here's the DAC voltage spectrum with
its associated RMS.
Also, for clarity, this model is |
|
|
39
|
Tue Oct 12 12:44:44 2021 |
Jiri Smetana | General | General | New Damping Loop Model | I've ironed out the issues with my
MATLAB model so that it now shows correct
phase behaviour. The problem seems to arise |
|
|
40
|
Tue Oct 12 12:49:42 2021 |
Jiri Smetana | General | General | Damping Loop (Point-Mass Pendulums) | Now that I have correct phase and amplitude
behaviour for my MIMO state space model of
the suspension and the system is being correctly |
|
|
41
|
Thu Oct 14 04:17:36 2021 |
Jiri Smetana | General | General | Damping Loop (Point-Mass Pendulums) | Here are the DAC and residual displacement
spectra for different suspension heights
ranging from 450 mm to 600 mm. I aimed to |
8x |
|
44
|
Tue Oct 26 08:09:08 2021 |
Jiri Smetana | General | General | Lagrangian Suspension Model - Extended Body | I've been testing out the extended
body lagrangian models and I'm trying
to understand the ground motion and force |
|
|
49
|
Wed Nov 17 09:27:04 2021 |
Jiri Smetana | General | General | Lagrangian Model - Translation & Pitch | I've been having a look at the transfer
functions for the translation and pitch of
both masses. I'm attaching the plot of |
|
|
50
|
Wed Dec 15 06:43:43 2021 |
Jiri Smetana | General | General | Lagrangian Model - Translation & Pitch | I've checked the validity of my state
space model in a couple of ways so that we
have confidence in the results that it gives. |
|
|
11
|
Fri Apr 23 10:41:22 2021 |
Aidan | General | Design specs | 2 um photodiode requirements | MCT HgCdTe requirements: https://docs.google.com/spreadsheets/d/1lajp17yusbkacHEMSobChKepiqKYesHWIJ6L7fgr-yY/edit?usp=sharing
|
|
|
35
|
Fri Oct 1 13:24:40 2021 |
Aidan | General | Design specs | TM Barrel coating emissivity | I have to question whether this passes
a sanity test. Surely in the case of Stack
2, the 10um thick Ta2O5 will absorb the majority |
|