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New entries since:Wed Dec 31 16:00:00 1969
ID Date Authordown Type Category Subject Text Attachments
  31   Mon Sep 27 17:01:53 2021 ranaGeneralHeat LoadMariner cooldown model status + next stepsHow
about a diagram so that we can understand
  
  52   Tue May 10 18:29:11 2022 ranaGeneralSuspensionMariner Suspension Cryo shield Install / Removal steps    
  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
  
  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
  
  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 
  2   Thu May 21 12:10:03 2020 StephenGeneralResourcesOngoing Mariner ResourcesOngoing points of updates/content (list
to be maintained and added)
Mariner
  
  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 
  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 
  17   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
  
  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
  
  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 
  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 
  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
  
  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 
  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 
  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 
  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 
  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
 6x 
  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
 VaryingSnoutparams.pdfMarinerTMCooldown_snout_optimal.pdf 
  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
 SnoutLengthCooldownTM.pdf 
  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 
  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 
  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 
  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
  
  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 
  15   Fri Jun 4 11:09:27 2021 PacoGeneralDesign specsHR coating tolerance analysisThe HR coating specifications are:


ETM
  
  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 
  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 
  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 
  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 
  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 
  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 
  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 
  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 
  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 
  67   Mon Jul 18 18:34:29 2022 PacoGeneralDesign specsHR coating updateI've been running the HR coating optimization
for mariner TMs. Relative to the specifications
found here
 ETM_R.pdfITM_R.pdfETM_Layers.pdfITM_Layers.pdf 
  68   Fri Jul 22 13:36:55 2022 PacoGeneralDesign specsHR coating updateHere are some corner plots to analyze the
sensitivity of the designs in the previous
elog to a 1% gaussian
 ETM_corner.pdfITM_corner.pdf 
  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
 6x 
  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
 ITM_corner.pdfETM_corner.pdf 
  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 
  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 
  1   Thu May 21 11:51:44 2020 KojiGeneralGeneralMariner Elog TestThe first entry of the Mariner elog post   
  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 
  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 
  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 
  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 
  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
  
  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 
  51   Thu May 5 19:56:25 2022 KojiGeneralSuspensionMariner Suspension Cryo shield Install / Removal stepsDoes this work? Is this insane?  40m_Mariner_Suspension-0062.png40m_Mariner_Suspension.mp4 
  54   Thu Jun 16 19:43:36 2022 KojiGeneralSuspensionTable for Mariner Suspension Cryo- B246/QIL Skyhook


Find the base of Skyhook.
It should be in the storage room (B246).
  
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