ligo-ex ligo-ds
  Richardson Lab Experimental Log, Page 8 of 15  Not logged in ELOG logo
ID Date Authordown Type Category Subject Text Attachments
  621   Tue Aug 5 11:25:17 2025 MaryUpdate point absorber and coated aperture in A#Simulating how point absorber defects on
Advanced LIGO mirrors affect cavity performance
by modeling a 4km LIGO-like arm cavity with
 point_absorber_A#.pdf 
  630   Tue Aug 12 13:49:24 2025 MaryUpdate point absorber and coated aperture in A#   Aug12.pdf 
  660   Thu Nov 13 12:39:01 2025 MaryUpdateInterferometer Simulations    PA.pdf 
  671   Thu Jan 22 13:12:29 2026 MaryUpdate     PA_matem2.pdfPA_maxtem6.pdfmaxtem600.jpgmaxtem2dis.jpgdismaxtem6.jpg 
  681   Thu Feb 5 13:59:42 2026 MaryUpdateInterferometer Simulations    112.pdf 
  684   Thu Feb 12 12:59:29 2026 MaryUpdate     SB_scattering.pdf 
  700   Thu Apr 16 14:04:46 2026 MaryUpdateInterferometer SimulationsBeam position optimization algorithm   beam_position_optimization.pdf 
  705   Thu Apr 30 12:08:02 2026 MaryUpdateVACNew Vacuum designhttps://autode.sk/3QFUGF8   
  706   Thu Apr 30 12:52:26 2026 MaryUpdateInterferometer SimulationsFull interferometer simulation   Full_interferometer.pdf 
  715   Thu Jun 4 11:21:29 2026 MaryUpdateVACVacuum designhttps://autode.sk/43S0ZbK  Convection.pngVC_Design_-_06-04-2026.pdf 
  718   Thu Jun 18 08:40:07 2026 MaryInfrastructureGeneralFume hood[Ma, Mary]


The tape residue on the fume hood
was cleaned using acetone; however, the acetone
 Fume_hood.pdf 
  719   Thu Jun 18 12:36:46 2026 MaryUpdate Beam position optimization algorithmSlides   
  720   Thu Jun 25 11:42:29 2026 MaryUpdateTCSBeam position optimization algorithm
Weight Calibration:
this study looks at how the thermal-compensation
  
  733   Thu Jul 9 13:35:08 2026 MaryUpdateInterferometer Simulations    gt_Current_gt1_landscape.pnggt_Current_gt1_2d.png 
  606   Tue Jul 8 11:46:55 2025 Maple MatznerUpdateTCSUpdate on SURF progress for Jul 8   Maple_TCS_update_jul_8.pdf 
  617   Tue Jul 29 11:45:19 2025 MapleUpdateTCSMeeting update   Maple_TCS_update_jul_29.pdf 
  541   Sun Mar 23 15:39:06 2025 Luke JohnsonUpdateScripts/ProgramsRingheater Location optimizationAttached are some plots that show a new parameter
sweep with a finer mesh then before. I have
also been able to get a heatmap of power
 _4-4.png_40.png02.pngHOM_power.svg 
  543   Mon Mar 31 11:26:45 2025 Luke JohnsonUpdateScripts/ProgramsHeatmaps of power delivery performance These plots show the required temperature
to release 100W of power and the efficiency
of a particular configuration with half-width
 temp_required.pngefficiency.png 
  405   Mon Jul 15 13:30:49 2024 Luke UpdateVACProblem with 2.75" to 1.33" zero length reducer Last Friday while checking the depth of the
ZLR I got one of the screws stuck. Today
I tried a couple things to get it out. First
 IMG_1882.jpg 
  423   Mon Aug 12 16:35:30 2024 Luke Update Ringheater modeling Update   HR_surface_deformation.pngIrradiation_pattern_input.pngHR_surface_deformation_other.png 
  435   Fri Sep 6 14:34:52 2024 Luke UpdateVACHeating tape workOn the 5th I had tried to start baking
the vacuum chamber however certain parts
of the chamber were getting too hot and causing
  
  452   Wed Oct 2 12:05:42 2024 Luke Update Ringheater modeling UpdatePower
point slides
  
  Draft   Wed Oct 23 12:33:54 2024 Luke Update Zernike calculation updatePowerPoint
slides new

PowerPoint
  
  471   Wed Nov 13 14:06:00 2024 Luke UpdateGeneral slides   
  472   Thu Nov 14 10:46:20 2024 Luke SummaryCleanroomCleanroom cleaning 
[Luke, Luis, Michael]
cleaning cleanroom and particle count
 partical_count_final.png 
  474   Tue Nov 19 17:10:34 2024 Luke UpdateVACLeak checkChamber temperature: 23C
Chamber Initial Pressure: ~1.8e-8
main, ~3.5e-8 rga
 image.pngIMG_5116.jpegIMG_5117.jpeg 
  478   Wed Nov 27 12:27:45 2024 Luke SummaryVACSummary of vacuum work[Luke, Luis]
Update of current state of vacuum
chamber
 2024-11-27_PostBake1_ArO.png 
  480   Wed Nov 27 16:23:58 2024 Luke UpdateVACStarted bake[Luke, Luis]
The
vacuum chamber is currently baking. 
  
  483   Mon Dec 2 13:35:45 2024 Luke UpdateGeneralClean and bake of Viton O-rings[Luke, Luis]
We couldn't access the bake log on
the wiki. (see attached) So we looked in
 image_(2).png 
  497   Wed Jan 8 17:35:57 2025 Luke SummaryCleanroomCleanroom cleaning[Luke, Tyler, Cynthia, Shane, Michael]
Summary of Cleaning Activities:
We began cleaning Room 1119 at 2:00
 partical_count_250108.png 
  500   Tue Jan 21 10:12:02 2025 Luke SummaryGeneralFrosti toy model [Luke, Liu]
Over the winter break I have been
working on this
  
  502   Sat Jan 25 18:19:39 2025 Luke UpdateGeneralRingheater modeling UpdateHere
is a quick update on some of the things I
have been working on regarding my project. 
  
  507   Sat Feb 1 17:25:52 2025 Luke SummaryGeneralCleanroom cleaning[Luke, Cece, Luis]
Particle Count Measurements:

Pre-cleaning (12:15
 20250131_particalcount.png 
  509   Fri Feb 7 12:25:56 2025 Luke SummaryVACStarted bake[Luke, Luis]
The
vacuum chamber is currently baking. 
  
  513   Sun Feb 16 16:45:18 2025 Luke UpdateGeneralRingheater position optimization Over the last couple weeks I have been
working on finding the optimal position of
the ringheater's thermal profile. 
 02.png_40.png_4-4.png02_40_4-4.png 
  517   Tue Feb 18 11:19:13 2025 Luke ConfigurationVACRepositioning of the lid's temperature probeBefore the recent bake I slightly repositioned
the temperature probe on the lid from beside
the heater tape to under the heater tape.
  
  520   Sun Feb 23 12:11:43 2025 Luke SummaryCleanroomCleanroom cleaning[Luke, Mary, Luis]
Particle Count Measurements:

Pre-cleaning (8:40
 partical_count_2-21-25.png 
  521   Sun Feb 23 16:00:07 2025 Luke UpdateScripts/ProgramsRingheater modeling UpdateThese are some plots:
The first shows the convergence of
the 02 mode reducing the size of the mesh.
 mesh_convergence.pngnumerical_error_in_innerproduct_of_zernike_basis_elemets.png 
  550   Tue Apr 8 12:15:59 2025 Luke UpdateScripts/ProgramsUpdated optimization plot   HOM_scattering_w__nominal_and_min.png 
  557   Tue Apr 22 08:00:39 2025 Luke UpdateScripts/ProgramsThermal optimization modeling 40kgI have redone the width and location optimization
with a 40kg test mass. This was to see where
the nominal ring heater would fall in this
 40kg_into_HOM.png 
  561   Fri Apr 25 09:09:03 2025 Luke UpdateScripts/ProgramsUpdate to optimization plotsI have calculated the curvature of the surface
plots and created a heat map out of the data.
I have also created a contour plot of them
 HOM_scattering_100kg_modified.pngcurvature_100kg.pnginitial_contour_plot_with_hom_and_curvature.pngtemp_quality_(log10_ratio).png 
  562   Fri Apr 25 19:18:10 2025 Luke UpdateScripts/ProgramsNew optimization plotsI have created two more plots. One on the
transmitted power for a specific configuration.
This was done by taking the product of the
 effective_power.pngproximity.png 
  569   Sun May 4 18:17:45 2025 Luke UpdateScripts/ProgramsRingheater modeling UpdateSlides

I have changed some properties
of the thermal model and am re-running the
  
  574   Fri May 9 20:06:27 2025 Luke SummaryCleanroomCleanroom cleaning[Luke, Mohak, Luis]
We were also able to remove the residue
that has built up on the soft walls by donning
 20250509_particalcount.png 
  575   Sun May 11 19:36:42 2025 Luke UpdateScripts/ProgramsNew optimization plotsSlides
I have re-run the optimization plots
with the changes mentioned last week. 
  
  584   Mon Jun 2 09:45:06 2025 Luke UpdateScripts/ProgramsRingheater modeling UpdateSlides
I have added some slides to my meeting
updates. The updates include: my choice in
  
  599   Wed Jun 25 15:44:47 2025 Luke UpdateCleanroomCleanroom cleaning[Luke, Luis, Tyler, Ma, Christina, Maple]
We started by cleaning outside of
the cleanroom wiping down the cable channel
 parttical_count_6-25-25.png 
  609   Mon Jul 14 20:45:20 2025 Luke SummaryCleanroomHEPA filter performance metrics [Luke, Luis]

We’ve been looking into methods
for evaluating the performance of the HEPA
  
  371   Fri May 31 19:37:47 2024 LukeUpdate Vacuum chamber Disassembly [Luke, Aiden, Jon, Michel, Tyler]

Work
done:
On Tuesday (5/28) we removed the RGA
line with minimal difficulty. On Wednesday
 IMG_1681.jpgIMG_1680.jpgIMG_1680.jpgIMG_1681.jpg 
  378   Wed Jun 19 18:45:14 2024 LukeUpdate Vacuum chamber reassembly [Luke, Aiden, Mohak , Tyler]

On Tuesday
we had the silver screws for the spherical
cube shortened by a quarter of an inch so
 image_2024-06-19_182556383.pngimage_2024-06-19_182631737.pngIMG_1710.jpg 
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