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New entries since:Wed Dec 31 16:00:00 1969
ID Date Author Type Category Subjectup Text Attachments
  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
  
  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

 
  
  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 
  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 
  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 
  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 
  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 
  62   Mon Jul 11 16:24:31 2022 Jennifer HritzGeneralOptical ContactingBaselining the temperature output of the Oster hot plateThis was performed last Friday (7/8).

I secured a thermocouple perpendicular
against the hotplate and recorded the
 PXL_20220708_230038748.jpgPXL_20220708_230234841.MP.jpg 
  71   Wed Jul 27 14:50:20 2022 Jennifer HritzGeneralOptical ContactingBonding without liquids and narrowing down heating issueI 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
 PXL_20220727_214658230.jpgPXL_20220727_214241668.mp4 
  61   Fri Jul 8 17:09:10 2022 JuanGeneralGeneralCoil Driver and Sat AmpAll three coil driver boards are complete
and have been tested. Modification for all
4 sat amp have been completed. Ideally, I
 IMG-5434.jpgIMG-5421.jpgIMG-5420.jpg 
  64   Mon Jul 11 17:39:17 2022 JuanGeneralGeneralCoil driver chassis Finished all 3 Coil Drover chassis
and power lines still need to install the
rear cables will do that after I finish Sat
 IMG-5493.jpgIMG-5494.jpg 
  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 
  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 
  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 
  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 
  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 
  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 
  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 
  65   Wed Jul 13 13:16:33 2022 JuanGeneralGeneralFinished coil driver and sat amp I have finished all coil driver and sat
amp chassis they all seem to be functioning
properly.
 IMG-5553.jpg 
  63   Mon Jul 11 17:27:39 2022 Jennifer HritzGeneralOptical ContactingFirst successful bondNote that the slides have "GLOBE"
printed on one side. I always bond the opposite
using the opposite side without the text.
 PXL_20220712_223449788.MP.jpg 
  56   Mon Jun 27 08:22:22 2022 JuanGeneralGeneralGeneral Update/ Need to do taskI've managed to cut and crimp wires
for the power board for coil driver. I will
begin adding components to the coil driver
 coildrive.jpg 
  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 
  15   Fri Jun 4 11:09:27 2021 PacoGeneralDesign specsHR coating tolerance analysisThe HR coating specifications are:


ETM
  
  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 
  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 
  50   Wed Dec 15 06:43:43 2021 Jiri SmetanaGeneralGeneralLagrangian Model - Translation & PitchI'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.
  
  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 
  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 
  1   Thu May 21 11:51:44 2020 KojiGeneralGeneralMariner Elog TestThe first entry of the Mariner elog post   
  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 
  52   Tue May 10 18:29:11 2022 ranaGeneralSuspensionMariner Suspension Cryo shield Install / Removal steps    
  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 
  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
  
  31   Mon Sep 27 17:01:53 2021 ranaGeneralHeat LoadMariner cooldown model status + next stepsHow
about a diagram so that we can understand
  
  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 
  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 
  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
  
  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 
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