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ID Date Author Type Category Subject Text Attachments
  49   Wed Nov 17 09:27:04 2021 Jiri SmetanaGeneralGeneralLagrangian Model - Translation & PitchI've been having a look at the transfer
functions for the translation and pitch of
both masses. I'm attaching the plot of
 plant_all_tfs.png 
  48   Tue Nov 16 11:47:54 2021 PacoGeneralDesign specsEstimate of in-air absorption near 2.05 um[Paco]

There was an error in the last
plot of the previous log. This was correctly
 PP_broadened_spectrum.pdf 
  47   Fri Nov 5 11:51:50 2021 PacoGeneralDesign specsEstimate of in-air absorption near 2.05 um[Paco]

I used the HITRAN database to download
the set of ro-vibrational absorption lines
 HITRAN_line_strenghts.pdfbroadened_spectrum.pdfPP_broadened_spectrum.pdf 
  46   Thu Nov 4 00:42:05 2021 KojiGeneralSuspensionMariner Sus DesignSome more progress:

- Shaved the height of the top
clamp blocks. We can extend the suspension
 Screen_Shot_2021-11-04_at_12.38.46_AM.pngScreen_Shot_2021-11-04_at_12.39.53_AM.png 
  45   Wed Nov 3 02:52:49 2021 KojiGeneralSuspensionMariner Sus DesignAll parameters are temporary:

Test mass size: D150mm x L140mm
Intermediate mass size W152.4mm x
  
  44   Tue Oct 26 08:09:08 2021 Jiri SmetanaGeneralGeneralLagrangian Suspension Model - Extended BodyI've been testing out the extended
body lagrangian models and I'm trying
to understand the ground motion and force
 comparison_xg.pngcomarison_F.png 
  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 
  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 
  41   Thu Oct 14 04:17:36 2021 Jiri SmetanaGeneralGeneralDamping 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 
  40   Tue Oct 12 12:49:42 2021 Jiri SmetanaGeneralGeneralDamping 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
 servo.pngopen_loop.pngclosed_loop.pngnoise.pnglength_change.png 
  39   Tue Oct 12 12:44:44 2021 Jiri SmetanaGeneralGeneralNew Damping Loop ModelI've ironed out the issues with my
MATLAB model so that it now shows correct
phase behaviour. The problem seems to arise
  
  38   Mon Oct 11 15:22:18 2021 YehonathanGeneralGeneralMicrocomb alternativesFollowing our discussion at the Friday
JC meeting, I gathered several resources
and made a small simulation to show how frequency
 ELMO_specs.pngHNLF_specs.pngSimulationResults1.pngSimulationResults3.png 
  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 
  36   Fri Oct 1 14:11:23 2021 PacoGeneralDesign specsTM Barrel coating emissivityAgree with this.
Quickly running tmm on the same "stacks"
gave the Attachment #1-3. (Ignore the
 stack_1.pdfstack_2.pdfstack_3.pdf 
  35   Fri Oct 1 13:24:40 2021 AidanGeneralDesign specsTM Barrel coating emissivityI have to question whether this passes
a sanity test. Surely in the case of Stack
2, the 10um thick Ta2O5 will absorb the majority
  
  34   Fri Oct 1 12:01:24 2021 PacoGeneralDesign specsTM Barrel coating emissivity[Paco, Nina, Aidan]

We ran our stack emissivity calculation
on different AR stacks to try and make a
 stack_1.pdfstack_2.pdfstack_3.pdfinterpolated_n_k.pdf 
  33   Fri Oct 1 11:52:06 2021 PacoGeneralDesign specsHR coating emissivity[Paco, Nina, Aidan]

Updated the stack emissivity code
to use the Kitamura paper fused silica dispersion
 ETM_210409_120913_emissivity.pdfinterpolated_n_k.pdf 
  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 
  31   Mon Sep 27 17:01:53 2021 ranaGeneralHeat LoadMariner cooldown model status + next stepsHow
about a diagram so that we can understand
  
  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
  
  29   Fri Sep 24 11:02:41 2021 KojiGeneralGeneralActuation Feedback Model and NoiseWe had a meeting with the code open in
ZOOM. Here are some points we discussed:


The code requires another
 ground.m 
  28   Sun Sep 19 18:52:58 2021 PacoGeneralDesign specsHR coating emissivity[Paco, Nina]

We have been working on an estimate
of the wavelength dependent emissivity for
 ETM_210409_120913_emissivity.pdfinterpolated_TF_k.pdf 
  27   Thu Sep 16 10:02:47 2021 Jiri SmetanaGeneralGeneralActuation Feedback Model and NoiseHere's the DAC voltage spectrum with
its associated RMS.

Also, for clarity, this model is
 DAC_voltage.png 
  26   Wed Sep 15 09:15:21 2021 Jiri SmetanaGeneralGeneralActuation Feedback Model and NoiseI've implemented a more extensive feedback
model that uses proper conversions between
metres, volts, counts etc. and includes all
 displacement_asd.pngservo.pngsystem_loop.mground_freq.txtground_xx.txt 
  25   Thu Sep 9 20:42:34 2021 PacoGeneralDesign specsRerun HR coatings with n,k dispersion[Paco]

Alright, I've done a re-optimization
targetting a wider T band around 2128 nm.
 ETM210909190218.pdfITMLayers210909204021.pdf 
  24   Thu Sep 9 11:25:30 2021 PacoGeneralDesign specsRerun HR coatings with n,k dispersion[Paco]

I've re-run the HR coating
designs for both ETM and ITM using interpolated
 etm_updated.pdfitm_updated.pdf 
  23   Thu Aug 26 17:40:41 2021 StephenGeneralSuspensionSelecting MOS-style frame[Koji, Stephen]

Kind of a silly post, and not very
scientific, but we are sticking to it. During
 no_sos_cad_screenshot.pngvault_check_in_of_mariner_suspension_cad.png 
  22   Tue Aug 24 08:15:37 2021 Jiri SmetanaGeneralGeneralActuation Feedback ModelI'm posting a summary of the work I've
done on the Lagrangian analysis of the Mariner
suspension design and a state space model
 actuator_feedback_diagram.pngbode_servo.pngbode_plant.png 
  21   Tue Aug 17 17:48:57 2021 KojiGeneralEquipmentCrackle SW modelAs a kickoff of the mariner sus cryostat
design, I made a tentative crackle chamber
model in SW.
 Screen_Shot_2021-08-17_at_17.44.32.png 
  20   Fri Aug 6 04:34:43 2021 KojiGeneralGeneralTheoretical Cooling Time LimitI 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,
 cooling_curves.pdf 
  19   Tue Jul 27 11:38:25 2021 PacoGeneralDesign specsDOPO single pass PDC efficiencyHere is a set of curves describing the
single-pass downconversion efficiency in
the 20 mm long PPKTP crystals for the DOPO.
 singlepass_eff_overest.pdf 
  18   Wed Jul 7 16:32:27 2021 StephenGeneralEquipmentOverall Dimensions for Mariner Suspension Test Chamber ConceptWIP - Stephen to check on new suspension
dimensions and fit into 40m chamber
  
  Draft   Wed Jun 30 16:21:53 2021 StephenGeneralDesign specs [Stephen, Koji]

WIP - check layout of 60 cm suspension
in chamber at 40m, will report here
  
  16   Tue Jun 22 22:28:09 2021 KojiGeneralDesign specsTest Mass wedge designThe
ETM wedge of 0.5deg will allow us to separate
the AR reflections. We will be OK with the
 wedge.pdfLayout.pdfETM.pdfITM.pdf 
  15   Fri Jun 4 11:09:27 2021 PacoGeneralDesign specsHR coating tolerance analysisThe HR coating specifications are:


ETM
  
  14   Fri May 7 17:50:31 2021 Nina Vaidya & Shruti MaliakalGeneralDesign specsArm Cavity Design 2021 updateHere are the final slides with all the
results on the Arm Cavity Design, please
review. 
 Arm_Cavity_Design_05072021_with_tolerances.pptxHOMhelper.pyArm_HOManalysis.ipynbHOMplot.py 
  13   Fri May 7 09:57:18 2021 StephenGeneralEquipmentOverall Dimensions for Mariner Suspension Test Chamber ConceptKoji, Stephen

Putting together Koji's design
work with Stephen's CAD, we consider
 mariner_suspension_test_chamber_concept.jpg 
  12   Tue Apr 27 12:28:43 2021 Nina Vaidya & Shruti MaliakalGeneralDesign specsArm Cavity Design 2021Rana’s code: R_c = 57.3

-->New code with optimization:
sweeping through a range of R_c, using a
 Arm_Cavity_Design_04232021.pptxArm_HOM_optimization.ipynb 
  11   Fri Apr 23 10:41:22 2021 AidanGeneralDesign specs2 um photodiode requirementsMCT HgCdTe requirements: https://docs.google.com/spreadsheets/d/1lajp17yusbkacHEMSobChKepiqKYesHWIJ6L7fgr-yY/edit?usp=sharing

 
  
  10   Fri Apr 2 19:59:53 2021 PacoGeneralDesign specsDifferential evolution strategiesDifferential evolution strategies 'benchmarking'
for thin film optimization

Since
I have been running the ETM/ITM coatings
 diffevostrategies.pdf 
  9   Wed Mar 24 17:42:50 2021 PacoGeneralDesign specsSilicon TM dichroic coatings for phase IYeah, the magnitudes are the inverse weighted
scalar costs (so they lie on the appropriate
relative scale) and indeed larger enclosed
  
  8   Wed Mar 24 17:36:46 2021 PacoGeneralDesign specsLeast common multiple stacks and varL costUpdate on ETM/ITM coating design;

-
Following what seemed like a good, intuitive
suggestion from Anchal, I implemented a parameter
 ETM_Layers_210323_0925.pdf 
  7   Wed Mar 17 21:24:27 2021 gautamGeneralDesign specsSilicon TM dichroic coatings for phase II guess you have tried it already - but
does enforcing the stacks to be repeating
bilayer pairs of the same thickness fail
  
  6   Wed Mar 17 19:51:42 2021 PacoGeneralDesign specsSilicon TM dichroic coatings for phase IUpdate on ETM

New optima are
being found using the same basic code with
some modifications, which I summarize below;
 ETM_R_210317_1927.pdfETM_Layers_210317_1927.pdfETM_nominal_cornerPlt.pdf 
  5   Fri Mar 5 11:05:13 2021 StephenGeneralDesign specsFeasibility of 6" optic size in CAD6" vs 4" optic size comparison
using CAD - worth hopping into the 3D geometry
using the link below, but also posting a
 4in_from_20210305_easm.png6in_from_20210305_easm.png 
  4   Thu Mar 4 17:04:52 2021 PacoGeneralDesign specsSilicon TM dichroic coatings for phase IHave been using the 40m
Coatings repo code by Gautam (with some
modifications to make dichroic designs under
 ETM_coating_candidates.pdfITM_coating_candidates.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 
  2   Thu May 21 12:10:03 2020 StephenGeneralResourcesOngoing Mariner ResourcesOngoing points of updates/content (list
to be maintained and added)
Mariner
  
  1   Thu May 21 11:51:44 2020 KojiGeneralGeneralMariner Elog TestThe first entry of the Mariner elog post   
ELOG V3.1.3-